Visual calibration method and system

Abstract

The embodiment of the invention discloses a visual calibration method and system. The method comprises the steps that multiple cameras obtain target images respectively, first coordinates and second coordinates, namely coordinates of calibration points in an image coordinate system and coordinates of the index fixed points in a local target coordinate system, of the calibration points in each target image are determined, third coordinates are obtained, and the third coordinates refer to coordinates of two-dimensional codes in the target images in the image coordinate system; two-dimensional code information in the target image is extracted, the two-dimensional code information comprises fourth coordinates, the fourth coordinates refer to coordinates of the current two-dimensional code in aglobal target coordinate system, the second coordinates are corrected into fifth coordinates, and the fifth coordinates indicate coordinates of a fixed point in the global target coordinate system; and establishing a mapping relationship between the global target coordinate system and each image coordinate system according to the first coordinate and the fifth coordinate. A target with a two-dimensional code is utilized, local target coordinates of a calibration point are automatically corrected into global target coordinates through two-dimensional code information, and full-automatic calibration of the multi-camera vision system is achieved.

Description

technical field [0001] The present application relates to the technical field of visual calibration, in particular to a visual calibration method and system. Background technique [0002] With the continuous improvement of factory automation, a large number of production and testing equipment need to install image vision systems to improve the automation of equipment. In production equipment, the image vision system is often used to guide the automatic operation of the motion control system of the equipment to adapt to the inconsistent feeding position and size of the products to be processed, such as cog and fog equipment in the LCD industry. [0003] In inspection equipment, image vision systems are often used for dimensional measurement of processed products, assembly accuracy measurement, appearance inspection, etc., to ensure the pass rate of final products. High-precision industrial production and testing equipment put forward high-precision and large-field requiremen...

AI Technical Summary

Problems solved by technology

[0006] This application discloses a visual calibration method and system to solve the problem that the calibration method in the prior art is inefficient, complicated to operate, requires manual participation, and cannot realize multi-camera The problem of automatic calibration of vision system

Images