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Automatic calibration method for visual inspection system

An automatic calibration and visual inspection technology, applied in image data processing, instrumentation, calculation, etc., can solve the problems of inability to guarantee the consistency, accuracy and efficiency of calibration evaluation results.

Pending Publication Date: 2021-04-16
BEIJING LUSTER LIGHTTECH
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Problems solved by technology

To solve the problem that the existing manual calibration method cannot guarantee the consistency of the calibration evaluation results, and the accuracy and efficiency of the visual inspection system calibration are low

Method used

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  • Automatic calibration method for visual inspection system

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Embodiment Construction

[0020]Embodiments will be described in detail below, and examples are illustrated in the drawings. The following description is related to the drawings, unless otherwise indicated, the same numbers in the drawings represent the same or similar elements. The embodiments described in the following examples do not represent all embodiments consistent with the present application. An example of a system and method consistent with some aspects of the present application is only in accordance with the claims.

[0021]Seefigure 1,figure 1A flowchart of one embodiment of an automatic calibration method for a visual detection system is provided for the present application. This application provides an automatic calibration method for visual detection systems, including:

[0022]S1: Get the calibration target image to be taken to be calibrated; the calibration target image includes a pattern of different shapes, and the corresponding camera can be calibrated according to the different shapes.

[0023]...

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Abstract

The invention provides an automatic calibration method for a visual detection system. The automatic calibration method comprises the steps of obtaining a calibration target image shot by a to-be-calibrated camera; calculating a definition value, a resolution value and distortion deformation according to the calibration target image, and adjusting the lens focal length of the to-be-calibrated camera; obtaining a vertical line image according to the calibration target image, and adjusting the position of the to-be-calibrated camera relative to the calibration target; generating a gray scale curve according to the calibration target image, and adjusting the position of the to-be-calibrated light source relative to the to-be-calibrated camera; obtaining an image gray value according to the calibration target image, and carrying out white balance correction and flat field correction on the to-be-calibrated camera; and calculating the signal-to-noise ratio of the edge region and the signal-to-noise ratio of the central region of the image. According to the invention, automatic, rapid and accurate calibration of different types of detection systems is realized through a standardized process, the consistency of calibration evaluation standards is ensured, and the accuracy and efficiency of visual detection system calibration are improved.

Description

Technical field[0001]The present invention belongs to the technical field of visual detection system, and in particular to an automatic calibration method for visual detection systems.Background technique[0002]The visual inspection system is to use the camera instead of human eye to realize the identification, measurement, positioning and other functions. It has a wide range of applications. It can replace the quality test of various products in the production line, effectively improve product production and quality, and reduce labor costs. Prevent accidents caused by manual detection.[0003]The visual inspection system mainly includes a camera, lens, light source, and host computer software. The detection accuracy of the visual detection system is determined by the quality of the camera imaging. Factors affecting the quality of imaging include: camera, lens, light source position; image resolution, sharpness, distortion, brightness indicator, and uniformity, color correction paramet...

Claims

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Application Information

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IPC IPC(8): G06T7/80
Inventor 邹美芳杨皓琨笪仲跃张利飞
Owner BEIJING LUSTER LIGHTTECH
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