提取位图的特征，包括projection features；peripheral features；cross count features；图像识别的预处理步骤，用C++实现。-The extraction characteristics of the bitmap, including Projection Features Peripheral Features Cross count features the image recognition pretreatment step,

用于图像拷贝检测的图像匹配，提取图像的SIFT特征点，构成图像的特征。-For image copy detection of image matching, image SIFT feature point extraction, and then sift feature point the image characteristics