1. A display system for compensating visual field blind areas of a rearview mirror of a trailer is characterized by comprising a collecting device, a sensing device, a display control device and a display device;

the acquisition device comprises a left front camera, a right front camera, a left rear camera and a right rear camera; the left front camera and the right front camera are respectively arranged on the left side and the right side outside the cab, and the left rear camera and the right rear camera are respectively arranged on the left side and the right side of the hanging compartment;

the sensing device is an angle sensing sensor arranged on the trailer, and the angle sensing sensor is used for acquiring the angle of the hanging carriage deviating from the axis of the trailer head;

the display control device is connected with the acquisition device and the sensing device and comprises a processor, the processor is used for acquiring the angle of the hanging carriage deviating from the axis of the vehicle head through the sensing device, and directly transmitting the picture acquired by the acquisition device to the display device and/or transmitting the picture acquired by the acquisition device to the display device after cutting and synthesizing;

the display device is a display arranged in the cab, and the display device is connected with the display control device and is used for displaying the image output by the display control device to a driver.

2. The display system of claim 1, wherein the views of the images captured by the front left and front right cameras are in accordance with labeled class II and/or class iv views; the images collected by the left rear camera and the right rear camera comprise a hanging box body at the side where the cameras are located.

3. The display system according to claim 1, wherein the display device comprises a left display unit and a right display unit; the left display unit is used for displaying the picture collected by the left front camera or the picture synthesized by the left front camera and the left rear camera; the right display unit is used for displaying pictures collected by the right front camera or pictures synthesized by the right front camera and the right rear camera.

4. The display system according to claim 1, wherein the processor removes the frame with the preset width or the fixed width on the shielding side of the front camera hanging carriage turned in the opposite direction and/or the turning direction, retains the frame with the preset width or the fixed width on the side of the rear camera hanging carriage turned in the opposite direction and/or the turning direction, and places the retained frame at the removed frame for new frame composition.

5. The display system as claimed in claim 4, wherein the processor cuts and synthesizes the picture with the fixed width when the angle sensing sensor detects that the angle between the central axes of the head and the trailer exceeds the irradiation angle of the front camera on the steering side;

the fixed width is a width occupied by the hanging cage in a picture of the turning-side front camera.

6. The display system according to claim 1, wherein the display control device includes a storage unit that stores a display frame diagram X, a compensation frame diagram Y set and a compensation frame diagram Z set for a compensation screen, which are drawn in advance, for display on the display device; the processor carries out calculation and judgment according to the sensing of the sensing device, and retrieves a compensation block diagram Y which is in accordance with a preset width in a pre-stored compensation block diagram Y set_aAnd compensating block diagram Z of fixed width or preset width in compensating block diagram Z set_a；

The processor cuts the picture with preset width at the carriage side of the rear camera which turns to the opposite direction, and projects the processed picture to the retrieved compensation block diagram Y_aPerforming the following steps;

the processor cuts the picture with fixed width at the rear camera hanging box side in the steering direction, and projects the processed picture to a called compensation block diagram Z_aIn (1).

7. The display system as claimed in any one of claims 4 or 6, wherein the preset width is set according to an angle between a vehicle head and a central axis of the hanging compartment;

when the angle between the vehicle head and the central axis of the hanging compartment is 0-15 degrees, the preset width is 0;

when the angle between the head and the central axis of the hanging compartment is 15-30 degrees, the preset width is 1/3 width of the picture width;

when the angle between the vehicle head and the central axis of the hanging compartment is 30-45 degrees, the preset width is 2/3 width of the picture width;

when the angle between the vehicle head and the central axis of the hanging compartment is greater than or equal to 45 degrees, the preset width is the width of the whole picture.

8. A display method for compensating visual field blind areas of a trailer rearview mirror based on the display system of claims 1-7, wherein the display method comprises the following steps:

step 1: the processor acquires video images acquired by a plurality of cameras in real time;

step 2: the processor acquires the working state of the trailer;

and step 3: the processor generates an optimal non-shielding and minimum blind area scheme picture according to the working state of the trailer;

the working state comprises a hanging state and a running state; the hanging state comprises a hanging mode and a non-hanging mode; the driving state comprises straight driving, steering and backing;

the plurality of cameras include a front left camera, a front right camera, a rear left camera, and a rear right camera; the left front camera and the right front camera are respectively arranged on the left side and the right side outside the cab, and the left rear camera and the right rear camera are respectively arranged on the left side and the right side of the hanging compartment.

9. The display method according to claim 8, wherein in step 3, in the no-hanging-carriage mode, the processor provides a screen for a display device;

under the suspended carriage mode and the driving state is straight, the processor provides pictures of a left front camera and a right front camera for the display device;

under the carriage hanging mode and when the running state is steering or backing, the processor provides a front camera picture at the steering side and a cut and synthesized picture at the opposite steering side for the display device according to the angle between the vehicle head and the central axis of the carriage hanging;

in the process of cutting and synthesizing the pictures turned to the opposite direction, removing the pictures with the preset width at the shielding side of the front camera hanging box turned to the opposite direction, reserving the pictures with the preset width at the side of the rear camera hanging box turned to the opposite direction, and placing the reserved pictures at the position where the pictures are removed to perform new picture synthesis;

in the process of cutting and synthesizing the frame in the steering direction, when the angle between the central axis of the head and the trailer exceeds the irradiation angle of the front camera at the steering side, removing the frame with the fixed width at the steering side of the front camera at the steering direction, reserving the frame with the fixed width at the trailer side of the rear camera at the steering direction, and placing the reserved frame at the position where the frame is removed for new frame synthesis;

the fixed width is a width occupied by the hanging cage in a picture of the turning-side front camera.

10. The display method as claimed in claim 9, wherein the preset width is set according to an angle between a vehicle head and a central axis of the hanging compartment;

when the angle between the vehicle head and the central axis of the hanging compartment is 0-15 degrees, the preset width is 0;

when the angle between the head and the central axis of the hanging compartment is 15-30 degrees, the preset width is 1/3 width of the picture width;

when the angle between the vehicle head and the central axis of the hanging compartment is 30-45 degrees, the preset width is 2/3 width of the picture width;

when the angle between the vehicle head and the central axis of the hanging compartment is greater than or equal to 45 degrees, the preset width is the width of the whole picture.

Background

The rearview mirrors and the electronic rearview mirrors are important parts for ensuring the driving safety during the driving of a vehicle, the performance marking GB-15084 of the rearview mirrors of the motor vehicle specifies that the observation range of the rearview mirrors of the vehicle is the view range in the normal stop state of the vehicle, the observation ranges of the view of the two sides are different from the view range of the central axis of the vehicle by 25-45 degrees (caused by different observation eyepoints), but the observation range of the view of the vehicle in some specific environments is not specified.

The traction vehicle or the winch vehicle is characterized in that a vehicle head and a hanging carriage are axially locked or hinged, when the vehicle backs or turns, a driver needs to observe images on two sides of the hanging carriage and right behind the hanging carriage to assist the driver to smoothly pour into a preset position or drive according to a set track, but the deviation angle of the vehicle head is too large, a rearview mirror or an electronic rearview mirror on one side can be shielded by the hanging carriage due to the steering angle, the driver can only observe the state of one side of the vehicle, and complex and strange environments can easily cause single-side inner wheel difference accidents, vehicle tail flicking accidents and the like.

In the prior art, for example, patent application No. 201811278439.5, image information is acquired by fish-eye cameras arranged at multiple positions of a vehicle body, the image information is preprocessed and spliced, and a display screen is used to present the spliced image to a driver, so that the driver can obtain a 360-degree view of the vehicle; the 360-degree view is spliced into a panoramic view based on 4-6 cameras, the cameras must be fixed at certain positions and cannot deflect and shift, and the all-in-one type video camera is suitable for being used at low speed of a passenger car or an integrated truck. The tractor can move at any time because of the hanging carriage, and can not be spliced into a complete image due to the change of the video acquisition range.

The panoramic camera is a fish-eye image with great distortion because of an auxiliary driving product, has no legal and standard requirements on depth of field, object distance and the like, and can only be used as an auxiliary product.

The all-round camera is installed to illuminate downwards in a overlooking mode, and only the range of a near-periphery area of a vehicle can be seen due to the illumination angle of the camera, but the view range of a far-distance area of the vehicle cannot be seen.

The invention is used as a mandatory law product for replacing a rearview mirror, and the law has clear observation range requirements. And the performance test, the use condition, the visual field area required by the regulations, the safety requirement and the like of the camera are not equivalent products.

Disclosure of Invention

The invention aims to provide a display system and a method for compensating visual field blind areas of a rearview mirror of a trailer, which aim to solve the problem of blind area position display of a single-side carriage caused by head deviation during turning and backing of a vehicle and facilitate the rapid positioning of a position where a driver possibly risks the blind areas.

The display system is characterized by comprising a collecting device, a sensing device, a display control device and a display device;

the acquisition device comprises a left front camera, a right front camera, a left rear camera and a right rear camera; the left front camera and the right front camera are respectively arranged on the left side and the right side outside the cab, and the left rear camera and the right rear camera are respectively arranged on the left side and the right side of the hanging compartment;

the sensing device is an angle sensing sensor arranged on the trailer, and the angle sensing sensor is used for acquiring the angle of the hanging carriage deviating from the axis of the trailer head;

the display control device is connected with the acquisition device and the sensing device and comprises a processor, the processor is used for acquiring the angle of the hanging carriage deviating from the axis of the vehicle head through the sensing device, and directly transmitting the picture acquired by the acquisition device to the display device and/or transmitting the picture acquired by the acquisition device to the display device after cutting and synthesizing;

the display device is a display arranged in the cab, and the display device is connected with the display control device and is used for displaying the image output by the display control device to a driver.

Furthermore, the visual fields of the pictures collected by the left front camera and the right front camera are in accordance with the type II visual field and/or the type IV visual field specified by the label; the images collected by the left rear camera, the right rear camera, the left front camera and the right front camera comprise a hanging box body on the side where the cameras are located.

Still further, the display device includes a left display unit and a right display unit; the left display unit is used for displaying the picture collected by the left front camera or the picture synthesized by the left front camera and the left rear camera; the right display unit is used for displaying pictures collected by the right front camera or pictures synthesized by the right front camera and the right rear camera.

Furthermore, the processor removes the picture with preset width or fixed width on the shielding side of the front camera hanging box turning to the opposite direction and/or turning direction, reserves the picture with preset width or fixed width on the hanging box side of the rear camera turning to the opposite direction and/or turning direction, and places the reserved picture at the position where the picture is removed for picture synthesis in picture cutting and synthesis;

furthermore, when the angle sensing sensor detects that the angle between the vehicle head and the central axis of the trailer box exceeds the irradiation angle of the front camera on the steering side, the processor cuts and synthesizes the pictures with the fixed width;

the fixed width is a width occupied by the hanging cage in a picture of the turning-side front camera.

Still further, the display control apparatus includes a storage unit that stores a display block diagram X, a compensation block diagram Y set and a compensation block diagram Z set for a compensation screen, which are drawn in advance, for display on the display apparatus; the processor carries out calculation and judgment according to the sensing of the sensing device, and retrieves a compensation block diagram Y which is in accordance with a preset width in a pre-stored compensation block diagram Y set_aAnd compensating block diagram Z of fixed width or preset width in compensating block diagram Z set_a；

The processor simultaneously cuts the picture with the preset width at the carriage side of the rear camera which turns to the opposite direction, and projects the processed picture to the retrieved compensation block diagram Y_aPerforming the following steps;

the processor cuts the picture with fixed width at the rear camera hanging box side in the steering direction, and projects the processed picture to a called compensation block diagram Z_aIn (1).

Furthermore, the preset width is set according to an angle between the vehicle head and the central axis of the trailer box;

when the angle between the vehicle head and the central axis of the hanging compartment is 0-15 degrees, the preset width is 0;

when the angle between the head and the central axis of the hanging compartment is 15-30 degrees, the preset width is 1/3 width of the picture width;

when the angle between the vehicle head and the central axis of the hanging compartment is 30-45 degrees, the preset width is 2/3 width of the picture width;

when the angle between the vehicle head and the central axis of the hanging compartment is greater than or equal to 45 degrees, the preset width is the width of the whole picture.

The display method for compensating the visual field blind area of the rearview mirror of the trailer is further characterized by comprising the following steps of:

step 1: the processor acquires video images acquired by a plurality of cameras in real time;

step 2: the processor acquires the working state of the trailer;

and step 3: the processor generates an optimal non-shielding and minimum blind area scheme picture according to the working state of the trailer;

the working state comprises a hanging state and a running state; the hanging state comprises a hanging mode and a non-hanging mode; the driving state comprises straight driving, steering and backing;

the plurality of cameras include a front left camera, a front right camera, a rear left camera, and a rear right camera; the left front camera and the right front camera are respectively arranged on the left side and the right side outside the cab, and the left rear camera and the right rear camera are respectively arranged on the left side and the right side of the hanging compartment.

Further, in step 3, in the no-carriage mode, the processor provides the display device with pictures of a front left camera and a front right camera;

under the suspended carriage mode and the driving state is straight, the processor provides pictures of a left front camera and a right front camera for the display device;

under the carriage hanging mode and when the driving state is steering, the processor provides pictures for the display device according to the angle between the vehicle head and the central axis of the carriage hanging mode;

in the process of cutting and synthesizing the pictures turned to the opposite direction, removing the pictures with the preset width at the shielding side of the front camera hanging box turned to the opposite direction, reserving the pictures with the preset width at the side of the rear camera hanging box turned to the opposite direction, and placing the reserved pictures at the position where the pictures are removed to perform new picture synthesis;

in the process of cutting and synthesizing the frame in the steering direction, when the angle between the central axis of the head and the trailer exceeds the irradiation angle of the front camera at the steering side, removing the frame with the fixed width at the steering side of the front camera at the steering direction, reserving the frame with the fixed width at the trailer side of the rear camera at the steering direction, and placing the reserved frame at the position where the frame is removed for new frame synthesis;

the fixed width is a width occupied by the hanging cage in a picture of the turning-side front camera.

Furthermore, the preset width is set according to an angle between the vehicle head and the central axis of the trailer box;

when the angle between the vehicle head and the central axis of the hanging compartment is 0-15 degrees, the preset width is 0;

when the angle between the head and the central axis of the hanging compartment is 15-30 degrees, the preset width is 1/3 width of the picture width;

when the angle between the vehicle head and the central axis of the hanging compartment is 30-45 degrees, the preset width is 2/3 width of the picture width;

when the angle between the vehicle head and the central axis of the hanging compartment is greater than or equal to 45 degrees, the preset width is the width of the whole picture.

The invention has the advantages that:

according to the invention, through the arrangement of multiple cameras, the problem of view shielding of the hanging box is effectively solved by performing picture compensation on the area shielded by the hanging box in the rearview mirror in the steering process; compared with the common panoramic image spliced through the fisheye lens, the driver can more intuitively perceive the position of the dangerous factor, so that the thinking time is shortened, and the safety accidents are effectively reduced.

The front camera has a class II visual field capable of meeting the national standard requirement, has the capability of replacing the traditional rearview mirror, and is matched with the rear camera on the hanging carriage to realize the monitoring of the whole vehicle without blind areas.

According to the invention, the visual field of the rear camera arranged on the hanging compartment comprises the hanging compartment, so that a driver can visually perceive the position relation between a dangerous unit and the hanging compartment during picture compensation, the time for judging the content in the picture is further shortened, and the rapid response to dangerous scenes is realized.

According to the invention, the size of the area needing compensation is confirmed through the vehicle steering amplitude, and the compensation area can be matched with the shielding area, so that a driver can continuously obtain a more visual field in the blind area.

Drawings

FIG. 1 is a schematic diagram of a display system for compensating a blind field of view of a rearview mirror of a trailer according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a left front camera and a right front camera in a display system for compensating a blind field of view of a rearview mirror of a trailer according to an embodiment of the present invention, which should meet the requirement of a field of view range;

FIG. 3 is a schematic diagram of a left rear camera and a right rear camera in a display system for compensating a blind field of view of a rearview mirror of a trailer according to an embodiment of the present invention, which should meet the requirement of a field of view range;

FIG. 4 is a schematic diagram of the distribution of cameras in a display system for compensating blind zones of the rear view mirror of a trailer according to an embodiment of the present invention;

FIG. 5 is a schematic view of the fields of view of the cameras in a trailer steering state in a display system for compensating blind zones of the field of view of the rear view mirror of a trailer according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of an uncompensated image provided by a display device at a turning side in a trailer turning state in the display system for compensating a visual field blind area of a rearview mirror of a trailer according to the embodiment of the invention;

FIG. 7 is a schematic diagram of a display device on the opposite side of a trailer in a steering state for compensating a blind field of view in a display system for a rearview mirror of the trailer to provide an uncompensated picture;

FIG. 8 is a schematic diagram of a compensated image provided by a display device on a turning side in a trailer turning state in a display system for compensating a blind field of view of a rearview mirror of a trailer according to an embodiment of the present invention;

FIG. 9 is a schematic diagram of a compensated picture provided by a display device on the opposite side of a trailer in a steering state in a display system for compensating a visual field blind area of a rearview mirror of the trailer according to an embodiment of the invention;

fig. 10 is a schematic flowchart of a display method for compensating a blind field of view of a rear view mirror of a trailer according to an embodiment of the present invention.

Detailed Description

The technical solution of the present invention will be described in more detail with reference to the accompanying drawings, and the present invention includes, but is not limited to, the following embodiments.

As shown in fig. 1, the display system for compensating the blind area of the rearview mirror of the trailer comprises a collecting device, a sensing device, a display control device and a display device.

As shown in fig. 2-4, the acquisition device includes a front left camera, a front right camera, a rear left camera, and a rear right camera. The left and right sides outside the cab of the trailer are respectively provided with a left front camera and a right front camera, and the lenses of the left front camera and the right front camera face to the lateral rear of the side where the left front camera and the right front camera are located and are used for acquiring lateral rear real-time pictures of the two sides outside the cab of the trailer; the left front camera and the right front camera are used for acquiring a class II visual field and a class IV visual field which are in accordance with the specification in GB-15084. The left side and the right side of one end, close to the cab, of the trailer hanging box are respectively provided with a left rear camera and a right rear camera, and lenses of the left rear camera and the right rear camera face to the lateral rear of the side where the left rear camera and the right rear camera are located and are used for collecting lateral rear real-time pictures of two sides of the trailer hanging box; the installation height and the angle of the lens of the left rear camera and the right rear camera are close to those of the left front camera and the right front camera, the lens of the left rear camera and the lens of the right rear camera are kept consistent with the swing angle of the hanging box, and the collected pictures comprise the hanging box body on the side where the cameras are located.

The sensing device is an angle sensing sensor arranged on the trailer, and the angle sensing sensor is used for acquiring the angle between the head of the trailer and the trailer in real time. In another embodiment, the sensing device is software integrated in the processing device, and the angle between the head and the trailer is judged from the image by monitoring the real-time images acquired by the acquisition device and analyzing the images acquired by the camera arranged on the head and the images acquired by the camera arranged on the trailer through various algorithms.

The display control device is respectively connected with the acquisition device and the sensing device and comprises a processor and a storage unit which are mutually connected; the processor is used for starting a corresponding acquisition device on the hanging carriage according to the angle data between the head and the hanging carriage acquired by the sensing device, and cutting and synthesizing the real-time picture acquired by the acquisition device; the storage unit is used for storing the pictures acquired by the acquisition device and the pictures cut by the processor.

As shown in fig. 5-9, the images collected by the front left camera are images C, the images collected by the front right camera are images D, the images collected by the rear left camera are images E, and the images collected by the rear right camera are images F; for the composite image, if the vehicle turns left or backs up left as shown in fig. 5, the image observed by the left driver is C shown in fig. 6, and the image observed by the right driver is D shown in fig. 7; for the left view, a large area is filled by the hanging cage, and the right view has a large blind area, so that both sides need to perform certain picture compensation, after compensation, the picture observed by the left driver is C + E shown in fig. 8, and the picture observed by the right driver is D + F shown in fig. 9.

Specifically, the picture compensation scheme is as follows: firstly, the processor judges the width of a right compensation picture through the angle of the hanging carriage deviating from the axis of the vehicle head; secondly, acquiring a picture with a corresponding width close to the trailer side at the left side in the picture of the right rear camera according to the width of the compensation picture; thirdly, cutting off a picture with a corresponding width of a left sheltered part on the side of the hanging compartment in the picture of the front right camera according to the width of the compensation picture; and finally, filling the picture of the right rear camera to the cut position in the picture of the right front camera, and synthesizing the image with blind area compensation. For the left compensation picture, firstly, the processor judges the steering angle of the vehicle according to the angle of the trailer deviating from the axis of the vehicle head; secondly, when the steering angle exceeds the irradiation angle of the front left camera, obtaining a picture with a specific width close to the trailer side on the right side in pictures of the rear left camera according to the width of the compensation picture; thirdly, cutting off a picture with a specific width at the right side in the picture of the left front camera according to the width of the compensation picture; finally, filling the left rear camera picture to the cut position in the left front camera picture, and synthesizing an image with blind area compensation; and if the steering angle does not reach the irradiation angle of the left front camera, no compensation is performed, and only the picture acquired by the left front camera is displayed.

Similarly, if the vehicle turns right or backs up to the right, the images of the front and rear cameras on the two sides are synthesized, the two rear cameras can be always in an open state, and the two rear cameras can be started after the vehicle is judged to turn right or backs up to the right; for the left compensation picture, firstly, the processor judges the width of the compensation picture according to the angle of the hanging carriage deviating from the axis of the vehicle head; secondly, acquiring a picture with a corresponding width close to the trailer side on the right side in the picture of the left rear camera according to the width of the compensation picture; thirdly, cutting off the picture with the corresponding width of the right part which is shielded by the trailer side in the picture of the left front camera according to the width of the compensation picture; and finally, filling the picture of the left rear camera to the cut position in the picture of the left front camera, and synthesizing an image with blind area compensation. For the right compensation picture, firstly, the processor judges the steering angle of the vehicle according to the angle of the trailer deviating from the axis of the vehicle head; secondly, when the steering angle exceeds the irradiation angle of the right front camera, obtaining a picture with a specific width close to the trailer side at the left side in the pictures of the right rear camera according to the width of the compensation picture; thirdly, cutting off a picture with a specific width on the left side in the picture of the right front camera according to the width of the compensation picture; finally, filling the picture of the right rear camera to the cut position in the picture of the right front camera, and synthesizing an image with blind area compensation; and if the steering angle does not reach the irradiation angle of the right front camera, the compensation is not carried out, and only the picture collected by the right front camera is displayed.

In one embodiment, for the compensation of the picture on the opposite side of the trailer steering direction, a pre-drawn display block diagram X and a compensation block diagram Y set for compensating the picture are stored in a memory; the display frame X resolution corresponds to the resolution provided by the corresponding display device; display block diagram X with superimposed compensation block diagram Y_aCompensation block diagram Y_aIs an element in the set of compensation block diagrams Y, the compensation block diagrams Y_aThe width of the suspension box is determined according to the angle of the suspension box deviating from the axis of the vehicle head, and when the angle of the suspension box deviating from the axis of the vehicle head reaches a preset range, a compensation block diagram Y with the corresponding width is automatically taken_a(ii) a Compensation block diagram Y_aThe shape of the trailer can be rectangular or a special shape which is set according to the blind area in the specific trailer and trailer model; the compensation block diagram Y in the left view and the compensation block diagram Y in the right view are symmetrically designed, the compensation block diagram Y in the left view is arranged on the right side of the left view display block diagram X, and the compensation block diagram Y in the right view is arranged on the left side of the right view display block diagram X.

When the angle of the trailer box deviating from the axis of the vehicle head reaches a preset range, a compensation block diagram Y_aThen a compensation block diagram Y of corresponding size is taken according to the angle of the hanging carriage deviating from the axis of the vehicle head_a. For the display block diagram X of the side needing compensation, the processor fills the picture of the front camera of the side into the display block diagram X, calls the picture of the rear camera of the side into the same transition block diagram as the display block diagram X, and cuts out the compensation block diagram Y_aThe picture corresponding to the position is projected to the display block diagram X and the compensation block diagram Y_aCorresponding position, covering the compensation block Y in the front camera frame_aAnd generating a picture with a compensated visual field through cutting and synthesizing the picture at the corresponding position.

In the trailer steering side picture compensation, a compensation block diagram Z set which is drawn in advance and used for compensating pictures is also stored in the memory; compensation block diagram Z_aSuperimposed on the display diagram X, compensating the diagram Z_aIs an element in the set of compensation blocks Z, compensation blocks Z_aMay be of a particular widthThe fixed width is adopted, the fixed width can be determined according to the angle of the hanging carriage deviating from the axis of the vehicle head, and when the angle of the hanging carriage deviating from the axis of the vehicle head reaches a preset range, a compensation block diagram Z with the corresponding width is automatically taken_a(ii) a Compensation block diagram Z_aThe shape of the trailer can be rectangular or a special shape which is set according to the blind area in the specific trailer and trailer model; the compensation block diagram Z in the left view and the compensation block diagram Z in the right view are designed symmetrically, the compensation block diagram Z in the left view is arranged on the left side of the left view display block diagram X, and the compensation block diagram Z in the right view is arranged on the right side of the right view display block diagram X.

Compensation block diagram Z_aThen the corresponding compensation block diagram Z is taken according to the angle of the hanging carriage deviating from the axis of the vehicle head_aCompensation block diagram Z_aThe size of (b) may be the width occupied by the carriage in the view of the front camera, or may be a corresponding size generated depending on the angle of the carriage from the axis of the head. For the display block diagram X of the side needing compensation, the processor fills the picture of the front camera of the side into the display block diagram X, calls the picture of the rear camera of the side into the same transition block diagram as the display block diagram X, and cuts the compensation block diagram Z_aThe picture corresponding to the position is projected to the compensation block diagram Z in the display block diagram X_aCorresponding position, covering the compensation block Z in the front camera frame_aAnd generating a picture with a compensated visual field through cutting and synthesizing the picture at the corresponding position.

The display device is a display arranged in the cab, is connected with the display control device and is used for displaying the composite image output by the display control device to the driver; the display device comprises a left display unit and a right display unit, wherein the left display unit is used for displaying pictures collected by the left front camera or pictures synthesized by the left front camera and the left rear camera, and the right display unit is used for displaying pictures collected by the right front camera or pictures synthesized by the right front camera and the right rear camera; the left and right display units can be integrated on a display to display in a partition mode, and can also be respectively an independent display. The display device can be connected to a control bus or other vehicle control unit of the vehicle in addition to the display control device, in order to display the vehicle status parameters to the driver. The display of the display device can be integrated in the central control area or the electronic rearview mirror, and can also be respectively arranged on the A columns at two sides of the cab as the display device of the electronic rearview mirror.

In one embodiment, during the straight-line running of the trailer, the processor acquires video pictures of the left front camera and the right front camera in real time, directly transmits the video pictures to the display device without processing, and the display device displays rear-view pictures of the left side and the right side of the trailer. When the trailer starts to turn and back in the running process, the sensing device transmits the detected angle between the vehicle head and the central axis of the carriage to the processor in real time; the processor cuts video pictures collected by the front camera and the rear camera on two sides according to the angle between the vehicle head and the central axis of the carriage, wherein the sizes of the video pictures correspond to the angles; in the cutting process, caching both an original video picture and a cut video picture through a storage unit; and finally, the processor synthesizes the cut video pictures and respectively transmits the synthesized video pictures at the two sides to the corresponding areas of the display device for displaying. Of course, the driver can manually control the display device to display the vehicle class ii mirror display modes provided by the front left and right cameras, with the manual control mode being prioritized over the display screen provided by the present invention.

Specifically, for the picture compensation on the opposite side of the trailer in the steering direction, the left display unit and the right display unit are two displays arranged on the A pillars on the left side and the right side of the cab respectively, the screen width of each display is 109.5mm, and the resolution is 1920 x 720 pixels; when the angle between the head and the central axis of the trailer box is 15 degrees, the display width of a compensation picture in the display is 36.5 mm; when the angle between the head and the central axis of the trailer box is 30 degrees, the display width of a compensation picture in the display is 73 mm; when the angle between the central axis of the car head and the hanging compartment is 45 degrees, the display completely displays the compensation picture. For the picture compensation of the steering side of the trailer, when the angle between the head and the central axis of the trailer is greater than the visual field degree of the front camera, the picture with the compensation fixed width in the display is displayed, and the fixed width is the fixed width of the picture occupied by the trailer in the picture collected by the front camera; the same angle and width compensation strategy as on the opposite side of the trailer to the direction of steering may also be employed.

As shown in fig. 10, the present invention further provides a display method for compensating a blind zone of a rearview mirror of a trailer, comprising the following steps:

step 1: the processor acquires video images acquired by a plurality of cameras in real time;

the plurality of cameras comprise a left front camera and a right front camera which are arranged on the left side and the right side outside a cab of the trailer, and a left rear camera and a right rear camera which are arranged on the left side and the right side of one end, close to the cab, of the trailer. The left front camera and the right front camera are used for collecting a class II visual field and a class IV visual field which accord with the regulation in GB-15084 label; the left rear camera and the right rear camera are used for collecting the visual fields with the rear horizontal angle of 50 degrees at two sides of the trailer, and the visual fields of the left rear camera and the right rear camera comprise the trailer body at the side where the cameras are located.

Step 2: the processor acquires the working state of the trailer;

the working state of the trailer comprises a trailer hanging state and a running state; the hanging state comprises a hanging mode and a non-hanging mode; the driving state includes straight running and steering. The detection of the trailer state is in data connection with the automobile control bus through the processor, and whether the trailer is provided with the trailer or not is detected through the automobile control bus; the running state is collected by a sensing device, the sensing device can adopt an angle sensing sensor arranged on the trailer, the angle of the hanging carriage deviating from the axis of the trailer head is obtained through the angle sensing sensor, and meanwhile, the angle of the hanging carriage deviating from the axis of the trailer head can be judged through video images in various cameras through a software algorithm loaded by a processor.

And step 3: and the processor generates an optimal non-shielding and minimum blind area scheme picture according to the working state of the trailer.

In step 3, the processor provides various forms of pictures for the display device through the working state of the trailer.

Specifically, when the trailer is in a trailer-free mode, the trailer is not provided with the trailer, the processor does not monitor the angle of the trailer deviating from the axis of the trailer, and meanwhile, the processor cannot acquire image signals acquired by the left rear camera and the right rear camera due to the fact that the trailer is not provided with the trailer; at this time, the processor directly acquires images from the left and right front cameras and transmits them to the display device, providing the driver with images corresponding to the fields of view of the left and right main outside rear view mirrors and the left and right wide-angle outside rear view mirrors.

When the trailer is in a trailer-having mode, the trailer is provided with the trailer, the processor judges the running state of the trailer through the sensing device, and when the trailer runs straight or the sensing device detects that the angle of the trailer deviating from the axis of the trailer is smaller than 15 degrees, the processor judges that the running state of the trailer is running straight; when the sensing device detects that the trailer box deviates from the axis of the trailer head by more than or equal to 15 degrees, the processor judges that the running state of the trailer is steering.

When the processor judges that the running state of the trailer is straight, the processor directly acquires images in the left front camera and the right front camera and sends the images to the display device, and images equivalent to the visual fields of the left main outer rearview mirror, the right main outer rearview mirror and the left wide-angle outer rearview mirror are provided for a driver.

When the processor judges that the running state of the trailer is steering, the angle of the trailer box deviating from the axis of the trailer head is continuously detected, and the picture displayed by the display device is controlled according to the detected angle.

Specifically, taking the situation that the video pictures of the left display unit are generated in the process that the trailer turns right or backs a car to the right as an example, when the angle of the trailer box deviating from the axis of the trailer head is detected to be 15-30 degrees, firstly, the processor acquires the video pictures collected by the left front camera and the left rear camera, and transmits the video pictures to the storage unit for caching; secondly, the processor cuts video pictures collected by the left front camera and the left rear camera according to the angle of the hanging carriage deviating from the axis of the vehicle head, cuts a 1/3-wide video picture of which the right side is shielded by the hanging carriage to form a blind area for the video picture collected by the left front camera, only reserves a 1/3-wide video picture of which the right side is close to the hanging carriage for the video picture collected by the left rear camera, and caches the reserved cut pictures through the storage unit; thirdly, supplementing the video picture reserved by the left rear camera to the position where the video picture is cut off by the left front camera, and synthesizing the video picture into the same video picture; and finally, transmitting the video picture synthesized by the front left camera and the rear left camera to a position where the display system displays the left video picture.

When the angle of the hanging carriage deviating from the axis of the vehicle head is 30-45 degrees, firstly, a processor acquires video pictures acquired by a front left camera and a rear left camera, and transmits the video pictures to a storage unit for caching; secondly, the processor cuts video pictures collected by the left front camera and the left rear camera according to the angle of the hanging carriage deviating from the axis of the vehicle head, cuts a 2/3-wide video picture of which the right side is shielded by the hanging carriage to form a blind area for the video picture collected by the left front camera, only reserves a 2/3-wide video picture of which the right side is close to the hanging carriage for the video picture collected by the left rear camera, and caches the reserved cut pictures through the storage unit; thirdly, supplementing the video picture reserved by the left rear camera to the position where the video picture is cut off by the left front camera, and synthesizing the video picture into the same video picture; and finally, transmitting the video picture synthesized by the front left camera and the rear left camera to a position where the display system displays the left video picture.

When the angle of the hanging carriage deviating from the axis of the vehicle head is detected to be more than or equal to 45 degrees, the processor directly acquires the image of the left rear camera and sends the image to the position of the display system for displaying the left video picture.

Firstly, when the processor judges that the steering angle of the vehicle exceeds the irradiation angle of the right front camera according to the angle of the trailer deviating from the axis of the head of the vehicle, the processor acquires video pictures acquired by the right front camera and the right rear camera and transmits the video pictures to the storage unit for caching; secondly, the processor cuts video pictures collected by the right front camera and the right rear camera respectively, cuts out the video picture of the width occupied by the hanging box in the right picture of the video picture collected by the right front camera, only keeps the video picture of the width occupied by the hanging box in the right picture of the video picture collected by the right rear camera, and caches the cut and kept pictures through the storage unit; thirdly, supplementing the video picture reserved by the right rear camera to the position where the video picture is cut off by the right front camera, and synthesizing the video picture into the same video picture; and finally, transmitting the video picture synthesized by the front right camera and the rear right camera to a position where the display system displays the right video picture. When the processor judges that the steering angle of the vehicle does not exceed the irradiation angle of the right front camera according to the angle of the hanging carriage deviating from the axis of the vehicle head, compensation is not performed, and the video picture collected by the right front camera is directly transmitted to the position of the display system for displaying the right video picture.

The second case employs a way of adapting the compensation size to the steering angle, the specific compensation scheme of which corresponds to the left display unit video picture generation scheme.

The situation for a process of turning the trailer left or reversing the trailer left corresponds to the above situation.

The present invention is not limited to the above embodiments, and those skilled in the art can implement the present invention in other various embodiments according to the disclosure of the embodiments and the drawings, and therefore, all designs that can be easily changed or modified by using the design structure and thought of the present invention fall within the protection scope of the present invention.