Lab空间色彩分割在快速车牌定位中的应用*

针对复杂环境下的车牌定位，提出了基于Lab空间色彩分割的快速车牌定位新方法：首先充分利用Lab空间色度分量a的红绿色特性去除红绿色干扰;再利用Lab空间色度分量b的蓝黄色特性，及蓝色和黄色数值的差别，提取出蓝色区域和黄色区域，为实现快速定位，把蓝色区域和黄色区域合并;最后通过纹理识别，一次性准确定位出蓝黄色车牌。实验结果证明，该车牌定位方法定位快速、准确。

Application of Lab spaces color segmentation in fast vehicle license plate location

To locate vehicle license plate in complex circumstance, this paper put forward a new method of fast plate location based on Lab spaces color segmentation. First, it took full advantage of the red and green traits of hue component a in Lab color spaces to wipe off the interference of red and green. Second, utilized the blue and yellow character of b (another hue component in Lab color spaces) and the numerical difference between blue and yellow, to extract blue area and yellow area. Then it united the blue area and yellow area to realize location quickly. At last, it employed textures to locate blue and yellow plate precisely. The result shows that it is a fast and accurate license plate location method.