PCB secondary and multiple accurate punching method based on visual tracking

Abstract

The invention discloses a PCB secondary and multiple accurate punching method based on visual tracking. After the image information of the PCB is obtained through the vision system, the image information is subjected to binaryzation through a cvThreshold function; calculating a communication domain which exists on the processed image by utilizing a FindBlobs function, and filtering the communication domain which is smaller than the area; accurately positioning the edge by means of a Zernike moment edge operator in the possible edge points after all possible edge points are quickly found through a Sobel operator, and calculating to obtain the center position coordinates of the Mark points or the prefabricated hole according to the edge coordinates. The data volume of the points needing to be calculated is greatly reduced, and the speed of determining the center coordinates is increased, and the accuracy is not lost; by adopting a multi-time punching mode, the center coordinates of the prefabricated hole are positioned again during each punching, and the deviation problem possibly caused by single positioning is corrected, the drill bit is a grinding process of the edge of the prefabricated hole punched previously during multiple times of punching, and the precision is far higher than that of the single punching.

Description

technical field [0001] The invention relates to the field of PCB drilling, in particular to a method for secondary and multiple accurate drilling of PCB boards based on vision tracking. Background technique [0002] With the development of computer digital image processing technology and non-destructive testing technology, detection and recognition technology is increasingly developing towards intelligent, high-reliability, high-speed automatic online detection; computer vision technology and reliability technology are the two major technologies of modern detection Basic; machine vision has been successfully applied in the field of industrial inspection, which includes automatic inspection of PCB boards (ie: printed circuit boards), automatic positioning of circuit boards and calibration of benchmarks, and accurate inspection of Obtaining the location of components plays an important role. [0003] In the stage of PCB board design, designers usually make Mark points as posi...

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Problems solved by technology

[0003] In the stage of PCB board design, designers usually make Mark points as positioning benchmarks. Only with accurate positional relationship can it be used for subsequent effective position detection; the patent document with application number: 201510795283.8 discloses a PCB based on machine vision. Solder joint positioning method; directly use the position of the identified Mark point to realize butt welding; however, the accuracy of this direct identification of the position of the Mark point is not enough in the PCB board drilling technology, and it is easy to cause subsequent use. Cases where the position does not match the printed plug

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