中文说明：
基于sift的图像复制粘贴篡改检测算法，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 copy and paste tamper detection algorithm based on SIFT, the algorithm first extracts SIFT features, uses the hybrid programming method of sift extraction provided on the Internet, then matches SIFT features, and uses RANSAC algorithm to eliminate mismatching, finally uses line segments to connect the matching points in the original block and the copy and paste block. This algorithm can resist all kinds of post-processing operations, such as rotation, scaling, adding noise and their combinations.