Flat field correction calibration method, device and system, computer equipment and medium

Abstract

The invention discloses a flat field correction calibration method, device and system for a camera, computer equipment and a medium. The calibration method comprises the following steps: acquiring first image data which is acquired by the camera and is used for processing imaging noise; performing imaging noise processing on a camera according to the first image data; acquiring second image data used for flat field correction and acquired by the camera after imaging noise processing; and obtaining a chromaticity space of the second image data, and determining a flat field correction parameter of the camera according to the chromaticity space. The camera is corrected based on the flat field correction parameter, the corrected camera can accurately restore the brightness information of the shooting target, the problem that the center of a convex mirror lens is bright and the edge is dark is solved, and the accuracy of optical detection is improved.

Description

technical field [0001] The present invention relates to the field of optical detection, and more specifically, to a camera flat-field correction calibration method, device and system, computer equipment and media. Background technique [0002] The performance of machine vision mainly depends on the lens, light source, and camera in the system optics. It has high requirements for optical inspection, and light field correction is required when it is applied to customer scenarios. [0003] The design of the lens itself is composed of a convex mirror, which will inevitably produce a bright center area in the imaging, and the brightness will show a linear attenuation to the edge area of ​​the lens. Therefore, this design will cause fatal brightness in optical automatic detection, which is difficult to accurately restore. , for a target with uniform brightness, an image with uneven brightness may be output, and the center brightness will always be higher than the edge brightness i...

AI Technical Summary

Problems solved by technology

[0003] The design of the lens itself is composed of a convex mirror, which will inevitably produce a bright center area in the imaging, and the brightness will show a linear attenuation to the edge area of ​​the lens. Therefore, this design will cause fatal brightness in optical automatic detection, which is difficult to accurately restore. , for a target with uniform brightness, an image with uneven brightness may be output, and the center brightness will always be higher than the edge brightness in optical photography, which will have an adverse effect on the subsequent target feature extraction, that is, measurement

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