Defect detection method for product of mirror surface bowl-shaped structure

[0025] Example 1

[0026] A defect detection method for mirror bowl-shaped structure products, such as figure 1 The imaging device shown includes a first camera, a second camera and a third camera arranged side by side, the first camera corresponds to the first group of bar light sources, the second camera corresponds to the second group of bar light sources, and the third camera corresponds to the third A group of bar-shaped light sources, the first group of bar-shaped light sources and the second group of bar-shaped light sources have two bar-shaped light sources, and the third group of bar-shaped light sources is one bar-shaped light source.

[0027] During the specific operation, first place the mirror bowl-shaped structure product to be inspected on the carrying table (the carrying table is fixed on the conveyor belt and moves with the conveyor belt), adjust the positions of all cameras, and ensure that all cameras are in an upright state; When the inspection product moves directly under the first camera, first move the height of one bar light source in the first group of bar light sources on the left side of the first camera, and continue to observe the imaging results of the product to be inspected during the height adjustment process. After trial and error, when the height of the strip light source is 160mm, the imaging result shows a strip light spot effect, and then adjust the position of the strip light source in the horizontal direction. The product is imaged until a bar-shaped light spot is located on the edge of the bowl surface; the other bar-shaped light source in the first group of bar-shaped light sources and the two bar-shaped light sources in the first group of bar-shaped light sources are symmetrically adjusted to the right of the first camera. The strip light source illuminates at the same time, the first camera images the product to be inspected, and obtains images with two strip light spots located on the edges of both sides of the bowl surface, such as figure 2 As shown, the maximum length L in the formed image is calculated by the image processing software 1max and the width W of the strip spot 1;

[0028] When the product to be inspected moves directly under the second camera, directly adjust the height of one bar light source in the second group of bar light sources on the left side of the second camera to 160mm, and then adjust the horizontal position of the bar light source. , illuminated by this strip light source, and the second camera images the product to be inspected until an image with a strip light spot located near the middle of the bowl surface is obtained; symmetrically adjust the second set of strip light sources on the right side of the second camera Another strip light source, two strip light sources in the second group of strip light sources are illuminated at the same time, and the second camera images the product to be inspected to obtain an image with two strip light spots located near the middle of the bowl surface, such as image 3 As shown, the maximum length L in the formed image is calculated by the image processing software 2max and the width W of the strip spot 2;

[0029] When the product to be inspected moves directly under the third camera, directly adjust the height of the third group of bar light sources (only one bar light source) to 160mm, and it is directly above the product to be inspected and directly below the third camera. The strip light source is illuminated, the third camera is rotated, the glass product to be tested is imaged, and the image with the largest strip spot width is found, such as Figure 4 As shown, record the rotation angle of the camera corresponding to the image, and calculate the maximum length L in the resulting image by the image processing software 3max and the width W of the strip spot 3;

[0030] if W 1 +W 2 +W 3 greater than L 1max , L 2max and L 3max In any one of the above-mentioned positions of the components of the imaging device, the subsequent detection of the product to be detected is performed; otherwise, the positions of the components of the imaging device are adjusted to meet the above conditions. After the above conditions are met, the position of each component of the imaging device is adjusted. If there is a defect, there will be black features such as black blocks, flowers, and lines in the light spot in the product image.