A Mark Point Visual Recognition and Positioning Method Based on Invariant Moments
A positioning method and visual recognition technology, applied in character and pattern recognition, image analysis, image enhancement and other directions, can solve the problems of scaling invariance, rotation invariance and poor real-time performance, and achieve scaling invariance and rotation invariance. problems, improved real-time performance, the effect of ensuring accuracy and reliability
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[0029] Step 1. For figure 2 As shown in the PCB diagram, the Mark points include a white solid circle in the center, two regular octagons, and the outermost large circle outline features, such as image 3 shown. Since the outline of the outer great circle is mainly used to segment Mark points and external interference information, the present invention only uses solid circles and two regular octagons as geometric features that need to be extracted, such as Figure 4 shown. According to the geometric relationship, get as figure 2 The target area in the picture to be tested is similar to the geometric features of the real Mark point.
[0030] The specific method is: for the circle and the regular octagon in the present invention, in order to simplify the algorithm, the unified search interval is That is: first search for white gray blocks in the image to be detected, and obtain the center coordinates of the gray blocks. Then start from any angle, search the edge of the c...
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