印章识别算法,即预处理、特征的提取。由于一个实际的印证识别系统涉及很多内容，不单单是图像对比的问题，现给出了基本的实现。-Seal recognition algorithm, namely, preprocessing, feature extraction. As a practical proof identification system involves many elements, not just the question of the image contrast, are given a basic implementation.