1. A method for measuring the diffusibility of disposable sanitary products is characterized by comprising the following steps: the method comprises the following steps:

1) acquiring a product image through an image recognition unit, wherein the product image comprises a product graph and an image of a diffusion graph of test liquid on a product;

2) carrying out binarization processing on the product image to enable the diffusion pattern on the product to form spots;

3) extracting the spot distribution diagram data to form a virtual image;

4) comparing the virtual image with a preset size image, wherein the size image is formed by measuring cells which are distributed in a matrix form and have determined sizes, and outputting values of diffusion length, width and diffusion area of the test liquid on the product by identifying the number and positions of the cells of the spots covered on the virtual image;

the step 2 comprises the following two modes:

a. when the tested liquid is transparent, manually drawing a closed curve along the edge of the liquid diffusion graph in advance, identifying and capturing the closed curve by an image identification unit, filling and processing an area surrounded by the closed curve, setting the filled area in the image to be black, setting the area outside the area to be white, and performing binarization processing, wherein the set black is a spot;

b. when the tested liquid is colored, the area with the color identified in the image is set as black, the area outside the range is set as white, and binarization processing is carried out, and the set black is speckles.

2. The method for measuring the diffusibility of a disposable sanitary article according to claim 1, wherein: in the above-described mode b, before the color region is identified, the upper limit threshold and the lower limit threshold of the color density identification are set, the density color within the threshold is set to black, and the density color outside the threshold range is white, and binarization processing is performed, and the black is a spot.

3. The method for measuring the diffusibility of a disposable sanitary article according to claim 2, wherein: the curve is a color that can form a conflicting color difference with the product color.

4. The method of measuring the diffusibility of a disposable sanitary article according to claim 3, wherein: the curve is black or red or blue.

5. The method for measuring the diffusibility of a disposable sanitary article according to claim 1, wherein: the measuring unit grid is of a square structure.

6. The method for measuring the diffusibility of a disposable sanitary article according to any one of claims 1 to 5, wherein: at least two first LED light bars and at least three second LED light bars are respectively arranged on the lower side of the image recognition unit, and the height dimension of each first LED light bar is smaller than that of each second LED light bar.

7. The method of measuring the diffusibility of a disposable sanitary article according to claim 6, wherein: the number of the first LED lamp bars is 2.

8. The method of measuring the diffusibility of a disposable sanitary article according to claim 7, wherein: the number of the second LED lamp strips is 4, and the second LED lamp strips are connected end to form a rectangular annular structure.

9. The method of measuring the diffusibility of a disposable sanitary article according to claim 8, wherein: the distance between the two first LED lamp strips is larger than that between the two second LED lamp strips which are positioned on the transverse direction.

Background

At present, the method for measuring the diffusivity (namely the quality of diffusion) of disposable sanitary products such as paper diapers and sanitary towels is to measure the actual diffusion length, width and area of liquid (urine on the paper diapers or menses on the sanitary towels) on the disposable sanitary products. In the measurement, the same amount of liquid is added, the diffusion length, width and area are measured in a specific time, the larger the diffusion area is, the better the dryness of the product is, but under the influence of the product indentation diversion trench and the pressure prismatic groove, the liquid can be elongated and diffused along the diversion trench or the pressure trench in a single direction, and the diffusion quality of the liquid of the product cannot be really measured.

Moreover, the liquid is irregularly diffused on the product, the outline of the liquid is a curve, and the result is difficult to quickly measure by adopting a common ruler, so that the error rate of measured data is large.

Therefore, how to measure the diffusibility of disposable sanitary products quickly and accurately becomes the subject of the present patent application.

Disclosure of Invention

Therefore, aiming at the problems, the invention provides a method for measuring the diffusibility of disposable sanitary products, which mainly solves the problems of low measurement efficiency and poor measurement accuracy of the diffusibility of disposable sanitary products in the prior art.

In order to achieve the purpose, the invention adopts the following technical scheme:

a method for measuring the diffusibility of a disposable sanitary product comprises the following steps:

1) acquiring a product image through an image recognition unit, wherein the product image comprises a product graph and an image of a diffusion graph of test liquid on a product;

2) carrying out binarization processing on the product image to enable the diffusion pattern on the product to form spots;

3) extracting the spot distribution diagram data to form a virtual image;

4) comparing the virtual image with a preset size image, wherein the size image is formed by measuring cells which are distributed in a matrix form and have determined sizes, and outputting values of diffusion length, width and diffusion area of the test liquid on the product by identifying the number and positions of the cells of the spots covered on the virtual image;

the step 2 comprises the following two modes:

a. when the tested liquid is transparent, manually drawing a closed curve along the edge of the liquid diffusion graph in advance, identifying and capturing the closed curve by an image identification unit, filling and processing an area surrounded by the closed curve, setting the filled area in the image to be black, setting the area outside the area to be white, and performing binarization processing, wherein the set black is a spot;

b. when the tested liquid is colored, the area with the color identified in the image is set as black, the area outside the range is set as white, and binarization processing is carried out, and the set black is speckles.

Further, in the above aspect b, before the color region is identified, the upper limit threshold and the lower limit threshold of the color density identification are set, and the density color within the threshold is set to be black, and the density color outside the threshold range is white, and the binarization processing is performed, and the density color set to be black is the speckle.

Further, the curve is a color that can form a conflicting color difference with the product color.

Further, the curve is black or red or blue.

Further, the measuring unit cell is of a square structure.

Furthermore, at least two first LED light bars and at least three second LED light bars are respectively arranged on the lower side of the image recognition unit, and the height dimension of each first LED light bar is smaller than that of each second LED light bar.

Furthermore, the number of the first LED lamp bars is 2.

Furthermore, the number of the second LED lamp strips is 4, and the second LED lamp strips are connected end to form a rectangular annular structure.

Furthermore, the distance between the two first LED lamp strips is larger than that between the two second LED lamp strips which are positioned on the transverse direction.

By adopting the technical scheme, the invention has the beneficial effects that: the measuring method of the diffusibility of the disposable hygienic product has high measuring efficiency and good measuring accuracy, solves the problems of high measuring difficulty and low measuring accuracy of irregular contour curves of the diffusion of product testing liquid in the product, and solves the shadow phenomenon generated by the three-dimensional structure of the product under illumination, in particular, the light radiation of a first LED light bar and the light radiation of a second LED light bar are counteracted by a penetrating area formed by the second LED light bar through the light reflection formed by the insert sheet image by the first LED light bar and the second LED light bar which are arranged up and down and the distance size of the first LED light bar is larger than that of the second LED light bar, the definition of the image obtained by a camera is greatly improved, the image obtained by the image identification unit is converted into digital information, and spot marks of the testing liquid diffusion area are formed through binarization processing, generating a virtual image with a spot distribution area and a spot outline size through information, comparing the virtual image with a preset size image, and calculating the diffusion length, width and diffusion area of the test liquid; meanwhile, the color density threshold is set to capture the spots and fill the closed curve, so that the technical defects which cannot be overcome in image measurement are overcome, the accuracy of the image acquired by the image recognition unit is ensured, and the accuracy of subsequent spot analysis and calculation is improved.

Drawings

FIG. 1 is a schematic front view of a detecting device according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a right-view structure of a detecting device according to an embodiment of the present invention;

FIG. 3 is a schematic view of a three-dimensional distribution structure of a camera, a support frame, a first LED light bar and a detection platform according to an embodiment of the present invention;

FIG. 4 is a bar graph of test mode output in an embodiment of the present invention;

FIG. 5 is a line graph of diffusion area output from the test mode in an embodiment of the present invention;

FIG. 6 is a line graph of diffusion length and width output from a test mode in an embodiment of the present invention.

Detailed Description

The invention will now be further described with reference to the accompanying drawings and detailed description.

The embodiment of the invention is as follows:

referring to fig. 1, 2 and 3, a method for measuring the diffusivity of a disposable hygienic product comprises a visual detection device, wherein the visual detection device comprises a controller, a display screen, a physical shooting button, a controller input device and a detection platform 1, the definition is that the length direction of the detection platform 1 extends to the left and right direction, the width direction of the detection platform extends to the front and back direction, and the height direction of the detection platform extends to the up and down direction, a guide rail 2 is arranged on the periphery of the detection platform 1, a longitudinal support bar 3 capable of sliding along the left and right direction of the guide rail 2 is arranged on the longitudinal support bar 3, a first support 4, a second support 5 and a third support 6 capable of sliding along the up and down direction of the longitudinal support bar are sequentially arranged on the longitudinal support bar 3 from top to bottom, first LED light bars 7 are respectively arranged on the left and right sides of the third support 6, one end of the first LED light bars 7 in the front and back direction is rotatably connected with the third support 6, realize the rotation of first LED lamp strip 7, be equipped with braced frame 8 on the second support 5 with sliding from top to bottom, braced frame 8 is rectangle annular structure, braced frame 8's middle part has one and pierces through district 81, braced frame 8's lower part is equipped with second LED lamp strip 9, second LED lamp strip 9's number of strips is 4, be equipped with the bracing piece 10 that removes along the fore-and-aft direction on the first support 4, be equipped with camera 11 on the free end of bracing piece 10, camera 11's shooting scope passes and pierces through district 81 and cover in detection platform 1, two the distance size of the left and right directions of first LED lamp strip 7 is greater than braced frame 8 and goes up the distance size of the ascending second LED lamp strip 9 of left and right directions.

The product is placed on testing platform 1, through removing longitudinal support pole 2, first support 4 and bracing piece 10, make camera 11's shooting scope cover testing platform 1, and catch the product on testing platform 1, adjust it to camera 11's focus point, the angle of rotation of rethread adjustment first LED lamp strip 7 and the position of second LED lamp strip 9, thereby eliminate because the shadow phenomenon that the spatial structure state product produced under the illumination, make the image cleaning degree that the camera obtained high, be favorable to discerning the diffusion region of liquid on the product.

Meanwhile, the second support 5 comprises a supporting block 51 capable of sliding along the longitudinal supporting rod 3, a first cross rod 52 arranged on the supporting block 51 and sliding along the left-right direction, a second cross rod 53 arranged on the first cross rod 52 and moving along the front-back direction, and a longitudinal rod 54 arranged on the second cross rod 53 and moving along the up-down direction, wherein the supporting frame 8 is arranged on the longitudinal rod 54, and the position of the second LED light bar 9 on the supporting frame 8 is further adjusted, so that redundant light radiation in light reflection formed by a product image is mutually offset with light radiation generated by the second LED light bar 9 when passing through the penetrating region 81, the definition of the image acquired by the camera 11 is greatly improved, and the shadow problem in product shooting is further eliminated.

The measuring method comprises the following steps:

the method comprises the following steps of unfolding and placing a product added with the same amount of liquid on a detection platform, covering the detection platform by adjusting the shooting range of an image recognition unit (camera), so that the camera can conveniently capture the product, and adjusting the projection angle, the projection area and the brightness of a first LED light bar and a second LED light bar, so that the shadow on the product is eliminated, and the camera can be used for capturing the product to form an image;

the camera captures a liquid diffusion pattern on the product while capturing the product, when the tested liquid is transparent, a closed curve is drawn manually along the edge of the liquid diffusion pattern in advance, the curve is a color capable of forming a conflicting color difference with the product color, preferably black or red or blue, preferably black, the camera recognizes and captures the closed curve, the camera converts the captured information into an image to be transmitted to the controller as a digital signal, simultaneously, the acquired image is stored in a memory, the controller fills and processes the area enclosed by the closed curve, performing binarization (black and white), setting the filling area in the image to be black, setting the area outside the filling area to be white, performing binarization processing, setting the black to be spots, setting the number of identified spots and the spot area, and forming and extracting spot distribution diagram data through a controller to form a virtual image;

or when the tested liquid is colored, the camera converts the captured information into a digital signal and transmits the digital signal to the controller, simultaneously stores the acquired image into the memory, sets an upper limit threshold value and a lower limit threshold value of color concentration identification, sets the concentration color in the threshold value to be black, sets the concentration color outside the threshold value range to be white, performs binarization processing, sets the concentration color to be black as spots, sets the number and the area of the identified spots, and forms data of an extracted spot distribution diagram through the controller to form a virtual image;

the controller compares the virtual image with a size image preset by the controller, the size image is composed of measuring cells distributed in a matrix mode and having a determined size, the preferred measuring cells are square structures with side lengths of 0.001mm, and the diffusion length, width and diffusion area values of the test liquid on the product are output by identifying the number and positions of the cells of the spots covered on the virtual image.

The measuring method has high measuring efficiency and good measuring accuracy, solves the problems of high measuring difficulty and low measuring accuracy of irregular contour curves of the diffusion of product testing liquid in a product and solves the shadow phenomenon generated by the three-dimensional structure of the product under illumination, and particularly, the light radiation of a first LED lamp bar and the light radiation of a second LED lamp bar are counteracted by a penetrating area formed by the light reflection formed by an insert sheet image through a first LED lamp bar and a second LED lamp bar which are arranged and distributed up and down, wherein the distance size of the first LED lamp bar is larger than that of the second LED lamp bar, and the first LED lamp bar can rotate to form three-dimensional irradiation, and the light reflection formed by the insert sheet image is formed by the penetrating area surrounded by the second LED lamp bar, so that the definition of the image obtained by a camera is greatly improved, and the image obtained by the camera is converted into digital information to form spot identification of a testing liquid diffusion area through binarization processing, generating a virtual image with a spot distribution area and a spot outline size through information, comparing the virtual image with a preset size image, and calculating the diffusion length, width and diffusion area of the test liquid; meanwhile, the color density threshold is set to capture the spots and fill the closed curve, so that the technical defects which cannot be overcome in image measurement are overcome, the accuracy of the camera for acquiring the image is ensured, and the accuracy of subsequent spot analysis and calculation is improved.

The image recognition unit is a camera, and the camera is a CV-X300 camera produced by Kenz.

Referring to fig. 4, 5 and 6, by the above-mentioned test method, the upper limit of the binarization threshold is 255, the lower limit of the binarization threshold is 111, the number of the spots is 30, and the lower limit of the spot area filtering area is 100, the following test examples are formed:

testing one:

and (2) testing:

and (3) testing:

while the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.