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High-precision and high anti-interference positioning method and device for Mark point of PCB

A high anti-interference, PCB board technology, applied in image data processing, instrument, character and pattern recognition, etc., can solve the problem of inability to accurately locate the reference point, the positioning method cannot be determined, etc., to improve anti-interference, remove interference, The effect of improving positioning accuracy

Active Publication Date: 2015-06-24
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing reference point positioning method does not take into account the interference of circular objects in the part of looking for circles, that is, if there are two or more circular objects in a picture, the existing positioning method cannot determine which one is True fiducials, which in turn cannot be positioned accurately

Method used

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  • High-precision and high anti-interference positioning method and device for Mark point of PCB
  • High-precision and high anti-interference positioning method and device for Mark point of PCB
  • High-precision and high anti-interference positioning method and device for Mark point of PCB

Examples

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no. 1 example

[0032] figure 1 It is a flow chart of the method for locating the Mark point of the PCB board with high precision and high anti-interference provided by the first embodiment of the present invention, and the method for locating the Mark point of the PCB board with high precision and high anti-interference includes:

[0033] In step S101, the picture of the mark point to be located is divided according to the difference between the pixel values ​​to obtain sub-pictures.

[0034] The placement head of the visual positioning system of the placement machine drives the downward-looking camera (also known as the reference point camera) to move above the reference point to take pictures and obtain pictures of the area where the reference point is located. Such as figure 2 As shown, the edges of the reference point are smooth and neat, and the color is obviously different from the surrounding background color. Different colors will have large differences in pixel values ​​in the pic...

no. 2 example

[0043] Figure 4 It is a flow chart of the method for locating Mark points on PCB boards with high precision and high anti-interference provided by the second embodiment of the present invention. The method for locating Mark points on PCB boards with high precision and high anti-interference is based on the first embodiment of the present invention Based on the example, further, the picture of the reference point Mark point to be positioned is divided according to the difference between the pixel values ​​to obtain sub-pictures, and the specific optimization is as follows: determine the distance between two pixel points in the picture The pixel value difference; determine whether the pixel value difference is greater than the preset threshold, if the pixel value difference is greater than the preset threshold, then the two pixels do not belong to the same area, if the pixel value difference is less than the preset threshold If the threshold is set, the two pixels belong to the...

no. 3 example

[0059] Figure 5 It is a flow chart of the method for locating Mark points on PCB boards with high precision and high anti-interference provided by the third embodiment of the present invention. The method for locating Mark points on PCB boards with high precision and high anti-interference is based on the first embodiment of the present invention Based on the example, further, based on the rough center and rough radius of the circular area, using the probe method to determine the reference point in the picture is specifically optimized as: selecting any one that passes through the rough center of the circular area Direction straight line: determine the correct reference point according to the pixel value change characteristics of the straight line in the circular area and the pixel value change characteristics of the standard reference point.

[0060] see Figure 5 , the method for positioning PCB board Mark points with high precision and high anti-interference, including: ...

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Abstract

The embodiment of the invention discloses a high-precision and high anti-interference positioning method and device for a Mark point of a PCB. The high-precision and high anti-interference positioning method for the Mark point of the PCB comprises the steps of performing picture partition on a picture of a to-be-positioned datum point Mark point according to a differential value between pixel values to obtain a sub-picture; acquiring the rough circle center and the rough radius of the circular area in the sub-picture by adopting a center of area method; based on the rough circle center and the rough radius of the circular area, determining the datum point in the picture by utilizing a probe method. Interferences of other circular objects can be effectively eliminated, the anti-interference performance of PCB datum point positioning can be improved, and the positioning precision can be further improved.

Description

technical field [0001] The invention relates to the technical field of manufacturing printed circuit boards, in particular to a method and device for locating Mark points on PCB boards with high precision and high anti-interference performance. Background technique [0002] The reference (Mark) point is a positioning mark on a printed circuit board (PCB), and the common shapes are circle, rhombus, triangle and cross, etc., among which the circle is the majority. [0003] In surface mount technology (Surface Mount Technology, SMT), the position of each component on the PCB is based on the reference point, so how to quickly and accurately find the position of the reference point has become an extremely critical link in the SMT surface mount process. This task is realized by the visual positioning system of the placement machine. The positioning accuracy, stability and positioning speed are the performance indicators to measure the quality of the visual positioning system. Fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G06T7/00
Inventor 高健曾友简川霞姜永军卜研岑誉陈新汤晖
Owner GUANGDONG UNIV OF TECH
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