Calibration technology for vision sub-pixel of embedded type machine with optical path adjustment

Abstract

The invention provides a calibration technology for a vision sub-pixel of an embedded type machine with optical path adjustment, which is a calibration technology of an adjustable optical path with on-line vision measurement. Main technologies including an optical path adjusting technology, a sub-pixel angular point extraction technology and a sub-pixel vision calibration technology are adopted in a calibration process, wherein the optical path adjusting technology comprises an optical intensity saturation prevention technology and an objective surface parallel-adjustment technology; the sub-pixel angular point extraction technology utilizes a spatial moment; and the sub-pixel vision calibration technology is based on an ideal grid. The invention overcomes the defects of the traditional measurement technology, carries out high-precision and high-stability calibration on a camera on a production line and can automatically carry out the vision measurement by using the calibration technology on the production line and finally detect the quality qualification of products; in addition, by adopting a design algorithm based on engineering idea, the invention has the advantages of high precision and speed, low requirements for production environment quality and high instantaneity, can well meet the requirements of industrial production, and has important significance on the vision measurement of the products in actual industrial production.

Description

technical field [0001] The invention relates to an embedded machine vision optical path adjustment and sub-pixel calibration technology, in particular to an adjustable optical path calibration technology for online visual measurement. Background technique [0002] Visual measurement technology has the advantages of fast speed, high precision, non-contact, and high degree of automation. This technology has played an increasingly important role in the field of non-contact measurement in recent years. Vision measurement not only includes the general content of machine vision, such as visual perception, image processing, image analysis and pattern recognition, but also has the specificity of the measurement field, such as precise detection, positioning and recognition of spatial geometric dimensions. Visual measurement can not only replace a lot of manual work, improve the level of production automation, improve monitoring accuracy, but also an effective solution when many conve...

AI Technical Summary

Problems solved by technology

Classical calibration algorithms in the field of vision, such as the two-step calibration of Zhang Zhengyou and Tsai, can calibrate the internal and external parameters of the camera, but it requires continuous shooting of several images that are not on the same plane, the actual operation is difficult, and the calculation process is relatively complicated; Yu Qifeng Although the idea of ​​plane vision calibration based on ideal grids is small in computation and high in precision, it is difficult to extract precise corner points and determine precise center grids. There is no specific calibration implementation method and no practical application cases.

In the development process of vision calibration research, there are very few preliminary works on calibration, such as the analysis and research on light intensity of light source and parallelism of objective mirror, and the related optical path adjustment system has not been specifically applied in vision calibration, and has not been applied to actual In industrial production

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