中文说明：基于复制粘贴的图像篡改检测算法，该算法首先提取出sift特征，用的是网上提供的提取sift的混合编程方法，然后将sift特征进行匹配并聚类，再用RANSAC算法剔除误匹配对，最后用线段将原始块和复制粘贴块中的匹配点连接起来。此算法能抵抗各种后处理操作，如旋转、尺度缩放、添加噪声等以及它们的几种组合。
English Description：
Image tamper detection algorithm based on copy and paste. Firstly, SIFT features are extracted by using the hybrid programming method of sift extraction provided on the Internet. Then SIFT features are matched and clustered. Then RANSAC algorithm is used to eliminate mismatching. Finally, line segments are used to connect the matching points in the original block and copy and paste block. This algorithm can resist all kinds of post-processing operations, such as rotation, scaling, adding noise and their combinations.