Sub-pixel checkerboard corner detection method based on color constancy

A technology of color constancy and corner detection, applied in image enhancement, image analysis, image data processing, etc., to achieve good universal effect
CN108010087AActive Publication Date: 2018-05-08SHANGHAI HUI X IMAGING INFORMATION TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANGHAI HUI X IMAGING INFORMATION TECH
Publication Date
2018-05-08

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Abstract

The invention belongs to the technical fields of image enhancement and feature detection and particularly relates to a camera calibration relevant technology in the three-dimensional measurement field. A sub-pixel checkerboard corner detection method based on color constancy comprises the steps that a, a Harris corner detector with color constancy is proposed; and b, the sub-pixel precision cornerdetection method with illumination and color offset invariance is proposed. By the adoption of the technical characteristics, almost identical pixel precision corner positions can be obtained relative to illumination and color changes.
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Description

technical field

[0001] The invention belongs to the technical field of image enhancement and feature detection, and specifically relates to the relevant technology of camera calibration in the field of three-dimensional measurement. Background technique

[0002] The image enhancement and feature detection technology used for camera calibration is to overcome the influence of light intensity changes and large dynamic range in the image on the accuracy of the detected feature point position, so that camera calibration can adapt to complex lighting conditions, so it is very important. meaning. Color constancy is the constancy of color perception that simulates human vision, and refers to the characteristic that the human eye's perception of color remains unchanged when the illumination on the surface of an object changes. It can be seen that color constancy can overcome the influence of illumination changes on checkerboard corner detection.

[0003] Based on the Beer-Lambert ...

Claims

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