关键词: 透射图像, 图像分割, 阈值化, 概率模型, 直方图

Abstract: When light penetrates through sheet, the perspective images such as images of watermark on the banknotes form. Its histogram has only a single peak. It’s very hard to get good segmentation with old methods. A probability model of distribution for perspective image’s background and objects was put forward, and a formula was deduced to compute the optimized segmentation threshold based on the probability model. The experiment results of show that this new approach can get wonderful segmentation for perspective image, and its computing speed is faster than that of other methods.

Key words:  perspective image, image segmentation, thresholding, probability model, histogram