Focusing detection system and focusing detection method

Abstract

A focus detection system includes a test pattern board, a camera device and a computer. The test pattern has two colors, and a junction is formed between the two colors, and the junction is arranged obliquely. The camera device shoots the test pattern at a focal length to obtain images. The computer performs the following steps: rotate the image so that the image areas at the junction are arranged in the vertical direction; obtain multiple gray scale values ​​of the rotated image in the horizontal direction and draw a gray scale curve, and the relational expression of the gray scale curve is the edge diffusion function ; Differentiate the edge spread function once to obtain the line spread function; perform Fourier transform on the line spread function to obtain the spatial frequency response function and then convert it into a modulation transfer function; then judge whether the focal length of the camera needs to be adjusted, thereby improving efficiency, And a focus detection method is provided for the focus detection system.

Description

technical field [0001] The present invention relates to a detection technology, and in particular to a focus detection system and a focus detection method using the focus detection system. Background technique [0002] Traditionally, when the vision automation equipment of the factory enters the factory, the vision module will be adjusted. During the adjustment process, the focal length adjustment of the visual photographic object has the following problems. [0003] A. Poor efficiency: Because the focus adjustment is mainly done manually, and the clarity of the camera image is observed with the human eye, if the equipment is more complicated, it may not be possible for one person to complete the adjustment work, resulting in poor adjustment efficiency. [0004] B. Different standards: Human eyes are used to judge the clarity of each device adjustment, which cannot achieve a uniform standard between devices, and there are even significant differences between devices adjusted...

AI Technical Summary

Problems solved by technology

[0003] A. Poor efficiency: because the focal length adjustment is mainly done manually, and the clarity of the camera image is observed with the human eye, if the equipment is more complicated, it may not be possible for one person to complete the adjustment work, resulting in poor adjustment efficiency

[0004] B. Different standards: Human eyes are used to judge the clarity of each device adjustment, which cannot achieve a uniform standard between devices, and there are even significant differences between devices adjusted by multiple people

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