Method for performing view-field-across accurate measurement on size of rectangular part through computer vision technology

Abstract

The invention discloses a method for performing view-field-across accurate measurement on the size of a rectangular part through a computer vision technology. The method comprises the following steps of arranging a rectangular part to be measured on a rectangular reference block, wherein a symmetry axis O and a symmetry axis O' are parallel to each other or form a certain included angle alpha, and alpha is greater than or equal to 0 degree and less than 15 degrees; adjusting to guarantee that the part does not go beyond the edge of the rectangular reference block; calculating the edge line size of the rectangular part to be measured by combination of the lengths of line segments EE', FF', GG', HH' and EF in the rectangular reference block, and the lengths of line segments EI, I'E', FJ, J'F', GK, K'G', HP and P'H' which are accurately detected by a preset computer image processing program. According to the invention, the precision of the detection result is high, the cost of a detection system is reduced, and the method can be applied to accurate measurement on the size of the rectangular part.

Description

Technical field [0001] The invention relates to the field of computer vision accurate measurement, and particularly refers to a method for accurately measuring the size of a rectangular part across a field of view with computer vision technology. Background technique [0002] The measured size of industrial product parts is an important basis for judging its quality, and controlling the size of parts within the design error range is an important means to ensure the quality of finished products. At present, the size detection of industrial product parts includes two categories: contact measurement methods and non-contact measurement methods. Contact measurement methods mainly include vernier calipers, micrometers, three-coordinate measuring instruments, etc. Although the results of such measurement methods are accurate, the measurement process is time-consuming and laborious, and it is easy to scratch and scratch the surface of product parts, which is difficult to meet the needs o...

AI Technical Summary

Problems solved by technology

Although the measurement accuracy of the detection device will not be affected by the mechanical translation stage, when the parameter to be measured is dozens of times, hundreds of times, or even more than the field of view of the camera, it needs tens, hundreds, or even more cameras. It is necessary to complete the measurement, which will easily lead to high detection costs

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