A Method of Accuracy Compensation Based on Machine Vision

Abstract

The invention discloses a machine vision based precision compensation method. The method comprises the following steps: arranging a camera module and a precision compensation target; through identifying a specific element in a calibration member, determining a distortion coefficient and an intrinsic rotation angle of the camera module; carrying out approximation and fitting on identification values of multiple known points by use of a regularization network interpolation algorithm and a preset punishment coefficient; identifying an actual position point set corresponding to multiple characteristic points through the camera module; and according to an original position point set and an actual position point set, calculating rotation conversion data and offset conversion data by use of an iteration algorithm, and then distributing the rotation conversion data and the offset conversion data to the precision compensation target. The method provided by the invention has the following advantages: errors caused by manual positioning by use of a conventional vision positioning device or an automatic device are substantially reduced, and a series of complete precision compensation schemes ranging from parameter compensation of the camera module itself to coordinate and path compensation of a target of the automatic device are realized.

Description

Technical field [0001] The invention relates to a precision compensation method based on machine vision, which is suitable for coordinate and path compensation of automated equipment. Background technique [0002] With the rapid development of my country's manufacturing industry, the precision requirements for production equipment are getting higher and higher. Currently, the most effective solution to improve accuracy is to use various accuracy compensation techniques. In the field of automation equipment, the function of the machine vision system is to calculate the rotation and offset of the actual coordinates of the workpiece on the worktable relative to the original coordinates by identifying several characteristic points (also called Mark points) on the passing workpiece. Shift. After the numerical control system of the automation equipment obtains the rotation and offset, it can correct the original coordinate origin and the movement path (for example, the processing too...

AI Technical Summary

Problems solved by technology

The error caused by the imaging module is the largest, and the cost of reducing this error is particularly expensive. For example, a better lens (such as a telecentric lens) can be used to reduce radial distortion, or a higher-precision camera can be used, and special instruments can be used. To detect the installation accuracy of the lens and camera to reduce tangential distortion, it will take more time to adjust and cost more

The current machine vision function library is still unable to calculate the exact solution, and can only approach the solution goal infinitely. Therefore, there are still technical difficulties in using the image processing library to minimize the error caused by the software recognition module

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