A workpiece positioning method and device thereof
A positioning method and workpiece technology, applied in the direction of measuring devices, optical devices, instruments, etc., can solve the problem that the workpiece positioning method cannot solve the problem of irregular shape workpiece positioning, and achieve the effect of improving the accuracy and recognition rate and reducing the detection time.
Active Publication Date: 2015-12-02
BYD SEMICON CO LTD
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[0003] In order to solve the problem that the workpiece positioning method in the prior art cannot solve the problem of irregular shape workpiece positioning, the present invention provides a positioning method and device for arbitrary shape workpieces
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[0012] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0013] figure 1 It is a flow chart of the steps of the workpiece positioning method in the embodiment of the present invention; the workpiece positioning method includes the following steps: Step 1: Binarize the workpiece image and obtain the coordinate sequence of the edge of the target area of the workpiece image; Step 2: According to the image target area The edge coordinate sequence obtains the edge coordinate sequence of sub-pixel precision; Step 3: Obtain the convex hull of the edge point set of the target area according to the edge coordinate sequence of sub-pix...
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A positioning method for workpieces comprises following steps: 1, conducting binaryzation of a workpiece image and obtaining the edge coordinate sequence of a target area of the workpiece image; 2, obtaining an edge coordinate sequence with sub-pixel precision based on the edge coordinate sequence of the image target area; 3, obtaining a convex hull of an edge point set of the target area based on edge coordinate sequence with sub-pixel precision; and 4, obtaining the center coordinate of a minimum circumscribed polygon of the convex hull based on the convex hull of the edge point set of the target area. The invention also provides a positioning device for workpieces. According to the positioning method for workpieces and the positioning device for workpieces, the high accuracy positioning instead of the coarse positioning is employed, the convex hull of the edge point set of the target area is obtained based on the edge coordinate sequence of the target area, and the center coordinate of the minimum circumscribed polygon of the convex hull is further obtained, thereby determining the accurate coordinate of a workpiece, reducing the time for detection, and improving the precision and the recognition rate.
Description
technical field [0001] The invention relates to the field of workpiece measurement, in particular to a workpiece positioning method and a device thereof. Background technique [0002] Machine vision is to use machines instead of human eyes to make judgments and measurements. It has a history of 20 years of development and is widely used in semiconductors, electronics industries and occasions where artificial vision is difficult to meet the requirements. Vision positioning is the first step and a key part of the vision system, and its positioning accuracy and efficiency directly affect the performance of the entire vision system. People have also studied positioning algorithms for many years. The current positioning algorithms are mainly based on machine learning, based on template matching, based on shape features, and based on color analysis. The method based on machine learning is the most complex, including AdaBoost algorithm based on classifier design, neural network, S...
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IPC IPC(8): G01B11/00
Inventor 王艳余涛
Owner BYD SEMICON CO LTD