Lens distortion correcting method and system used for automatic optical detection

An automatic optical detection and lens distortion technology, applied in image data processing, instruments, calculations, etc., can solve the problems of low corner extraction accuracy, large result error, poor correction effect, etc., and achieve high corner extraction accuracy and good effect. , the effect of reasonable parameters

Active Publication Date: 2016-06-22
WUHAN JINGCE ELECTRONICS GRP CO LTD
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Problems solved by technology

The existing distortion correction uses a uniform checkerboard. Since the distortion is mostly distributed on the edge, the calculation result using a uniform checkerboard has a large error; point, the process is complicated, the corner point extraction accuracy is low, and the final correction effect is poor

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  • Lens distortion correcting method and system used for automatic optical detection
  • Lens distortion correcting method and system used for automatic optical detection
  • Lens distortion correcting method and system used for automatic optical detection

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Embodiment Construction

[0035] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments to facilitate a clear understanding of the present invention, but they do not limit the present invention.

[0036] Such as figure 1 As shown, the present invention is a lens distortion correction system for automatic optical detection, including:

[0037] The image acquisition module is used to collect the distortion graphics and send the distortion graphics to the corner point rough extraction module; the image acquisition module includes a distortion graphics acquisition module, which is used for calibration of the lens to be corrected after selecting the non-uniform checkerboard as the calibration board The board obtains the distorted graphics;

[0038] The corner point rough extraction module is used to perform rough corner point extraction on the received distorted graphics to obtain dense corner points and send them to the corner...

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Abstract

The present invention discloses a lens distortion correcting method and system used for automatic optical detection. The method comprises the processes of selecting an uneven checkerboard as a calibration board, and obtaining a distorted figure; carrying out the angular point rough extraction on the distorted figure; carrying out the accurate angular point extraction on the roughly extracted dense angular points via the erosion and dilation and the blob analysis to obtain the real angular points; calculating a distortion model parameter between the coordinates of the real angular points and the ideal diagram angular point coordinates; according to the distortion model parameter and the coordinate of each pixel point in an ideal diagram, calculating the coordinate of each pixel point in the distorted figure; obtaining a pixel value corresponding to the coordinate of each pixel point in the distorted figure according to the coordinate of each pixel point in the distorted figure. According to the present invention, with the usage of the uneven checkerboard, the edge feature points are more and denser, so that the actual situation is approached better, and the calculated distortion model parameter is more reasonable. By the erosion and dilation and the blob analysis, the real angular points are extracted, the angular point extraction precision is high, and a distortion correction effect is good.

Description

technical field [0001] The invention belongs to the technical field of AOI automatic detection, and in particular relates to a lens distortion correction method and system for automatic optical detection. Background technique [0002] In the field of automatic detection and visual measurement, the quality of the camera lens directly affects the detection or measurement effect. There are many types of lenses on the market, but they will cause distortion to varying degrees. Even if it is expensive and the best lens, Distortion cannot be avoided either. Then, when detecting and measuring, the influence of distortion on subsequent processing must be solved first, and distortion should be corrected as much as possible. The existing distortion correction uses a uniform checkerboard. Since the distortion is mostly distributed on the edge, the calculation result using a uniform checkerboard has a large error; point, the process is complicated, the corner point extraction accuracy ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
CPCG06T5/006G06T2207/10004
Inventor 董文忠欧昌东梅林海汪舟简平超
Owner WUHAN JINGCE ELECTRONICS GRP CO LTD
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