What factors affect the accuracy of visual inspection

2026-08-24

Selection of industrial cameras:

Many customers choose CMOS cameras for cost reasons. When shooting the edges of objects, the contrast of the edge contours is poor and the noise is large, which brings large errors to the software measurement. It is usually recommended to use a CCD chip camera.

Selection of camera lens:

Since many mechanical parts have height differences, they have a larger depth of field. However, due to the viewing angle, it is difficult for ordinary lenses to capture the inner walls of components, etc. This makes it difficult for software to find the most realistic and accurate edge contours during processing, which puts higher requirements on image processing algorithms.

Choice of light source:

Many customers will choose ordinary backlight. When the visual detection accuracy is not high, the backlight has a price advantage. Under the premise of very high requirements, the principle of backlight is to use light to pass through a diffuse reflection plate to produce uniform and soft light. The light generated at a certain point will diverge to any angle in space. When detecting round or cylindrical objects, diffraction will occur at the edge of the object being measured. At the same time, changes in the brightness of the light source also have a greater impact on the brightness and darkness of the image.

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What factors affect the accuracy of visual inspection