图片检索之特征点提取.pptx

;;SIFT具体算法分析; System.loadLibrary( Core.NATIVE_LIBRARY_NAME );//JNI库文件装载 //在矩阵中存储图片的数据结构 Mat test_mat = Highgui.imread(123.jpg); Mat desc = new Mat(); //生成一个SiftFeatureDetector的对象（特征检测器） FeatureDetector fd = FeatureDetector.create(FeatureDetector.SIFT); MatOfKeyPoint mkp =new MatOfKeyPoint();//提取特征描述子 fd.detect(test_mat, mkp); DescriptorExtractor de = DescriptorExtractor.create(DescriptorExtractor.SIFT); pute(test_mat,mkp,desc );//提取sift特征 System.out.println(desc.cols()); System.out.println(desc.rows());;;