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阐述了高精度自动贴片机视觉对准系统的构成和原理。介绍了利用模式识别理论和图像的不变矩实现定位标志存在性判断的原理及算法和定位标志对准的原理及相关的图像处理算法,以及其中的点模式匹配算法。试验结果表明,定位标志存在性判断算法可以有效地区分不同的定位标志和判断定位标志是否在视场之内;定位标志对准算法在输入图像旋转、平移、定位标志被部分遮挡时,能精确地得到定位标志的位置偏差。
The composition and principle of high precision automatic placement machine vision alignment system are expounded. This paper introduces the principle and method of locating mark existence judgment based on pattern recognition theory and moment invariants of image, the principle of alignment mark alignment and related image processing algorithms, and the point pattern matching algorithm. The experimental results show that the existence judgment algorithm of locating marks can distinguish different locating marks effectively and judge whether the locating marks are within the field of view. The locating marks aligning algorithm can be accurate when the rotations, translations and locating marks of input images are partially obscured Get the location of the positioning mark deviation.