关键词: 图像分析, 套准, 最小二乘拟合, Hough变换

Abstract: In this paper，color division model and automatic detected method of color registers are proposed for register mark images of four kinds of initial color（cyan，magenta，yellow and black） that overlaps each other.Based on image analysis theory，a color recognition model for cyan pixels，magenta pixels，yellow pixels，black pixels and their complex color pixels is derived.The next step is that edge pixels of color marker are extracted，and their structural lines are approximated by least squares approximations and Hough transforms.Experiments indicate that precision of 20 micron is obtained when this automatic detected method of color register is applied.And this accords with general printing technology standard of china.This method can be applied to two or four color printing system via CMYK combination.

Key words: image analysis, register, least squares approximations, Hough transforms