openCV的几个例子

/* 程序名：hello.c 功能：从磁盘中读入图像文件，并将图像显示在屏幕上 */ #include "cv.h" #include "highgui.h" #include "math.h" #include "stdio.h" #include "stdlib.h" #include "time.h" //int main (int argc, char **argv) //{ // IplImage *src = 0; // IplImage *dst = 0; // clock_t start; // clock_t finish; // double duration; // // /* the first command line parameter must be image file name */ // if ((argc == 2) && (src = cvLoadImage (argv[1], -1)) != 0) // { // int delta = 1; // int angle = 0; // int opt = 1; // 1： 旋转加缩放 // // 0: 仅仅旋转 // double factor; // // dst = cvCloneImage (src); // cvNamedWindow ("src", 1); // cvShowImage ("src", src); // // for (;;) // { // // float m[6]; // // Matrix m looks like: // // // // [ m0 m1 m2 ] ===> [ A11 A12 b1 ] // // [ m3 m4 m5 ] [ A21 A22 b2 ] // // // // CvMat M = cvMat (2, 3, CV_32F, m); // // int w = src->width; // int h = src->height; // // start=clock(); // if (opt) // 旋转加缩放 // factor = (cos (angle * CV_PI / 180.) + 1.0) * 2; // else // 仅仅旋转 // factor = 1; // m[0] = (float) (factor * cos (-angle * 2 * CV_PI / 180.)); // m[1] = (float) (factor * sin (-angle * 2 * CV_PI / 180.)); // m[3] = -m[1]; // m[4] = m[0]; // // 将旋转中心移至图像中间 // m[2] = w * 0.5f; // m[5] = h * 0.5f; // // dst(x,y) = A * src(x,y) + b // cvZero (dst); // cvGetQuadrangleSubPix (src, dst, &M); // cvNamedWindow ("dst", 1); // cvShowImage ("dst", dst); // finish = clock(); // duration = (double)(finish - start) / CLOCKS_PER_SEC; // printf( "%f seconds\n", duration ); // // if (cvWaitKey (1) == 27) //ESC // break; // angle = (int) (angle + delta) % 360; // } // for-loop // } // return 0; // } //int main(int argc, char* argv[]) //{ // IplImage *src = 0; //源图像指针 // IplImage *dst = 0; //目标图像指针 // float scale = 5.618; //缩放倍数为0.618倍 // CvSize dst_cvsize; //目标图像尺寸 // // /* the first command line parameter must be image file name */ // if ( argc == 2 && (src = cvLoadImage(argv[1], -1))!=0 ) // { // //如果命令行传递了需要打开的图片就无须退出，所以注释掉下面一行！ // //return -1; // } // else // { // src = cvLoadImage("C:\vim.png", -1); //载入工作目录下文件名为“tiger.jpg”的图片。 // } // // dst_cvsize.width = src->width * scale; //目标图像的宽为源图象宽的scale倍 // dst_cvsize.height = src->height * scale; //目标图像的高为源图象高的scale倍 // // dst = cvCreateImage( dst_cvsize, src->depth, src->nChannels); //构造目标图象 // cvResize(src, dst, CV_INTER_LINEAR); //缩放源图像到目标图像 // // cvNamedWindow( "src", CV_WINDOW_AUTOSIZE ); //创建用于显示源图像的窗口 // cvNamedWindow( "dst", CV_WINDOW_AUTOSIZE ); //创建用于显示目标图像的窗口 // // cvShowImage( "src", src ); //显示源图像 // cvShowImage( "dst", dst ); //显示目标图像 // // cvWaitKey(-1); //等待用户响应 // // cvReleaseImage(&src); //释放源图像占用的内存 // cvReleaseImage(&dst); //释放目标图像占用的内存 // cvDestroyWindow( "src" ); //销毁窗口“src” // cvDestroyWindow( "dst" ); //销毁窗口“dst” // //void cvDestroyAllWindows(void); // // return 0; //} /* 程序名：hello.c 功能：从磁盘中读入图像文件，并将图像显示在屏幕上 */ //#include "cv.h" //#include "highgui.h" //#include "stdio.h" //#include "stdlib.h" //#include "time.h" int main( int argc, char ** argv ) { /* IplImage* pImg; //声明IplImage指针 IplImage* oImg; CvSize oSize; clock_t start, finish; double duration; CvRect rect ; rect.height = 120; rect.width = 120; rect.x = 0 ; rect.y = 0 ; oSize.width = 1600; oSize.height = 1200; //载入图像 pImg = cvLoadImage("c:/1.jpg", 1); cvSetImageROI(pImg,rect); oImg = cvCreateImage(oSize,pImg->depth,pImg->nChannels); start = clock(); cvResize(pImg,oImg,CV_INTER_LINEAR); finish = clock(); cvSaveImage("c:/2.jpg",oImg,0); duration = (double)(finish - start) / CLOCKS_PER_SEC; printf( "%f seconds\n", duration ); cvNamedWindow( "Image", 1 ); //创建窗口 cvShowImage( "Image", pImg ); //显示图像 cvWaitKey(0); //等待按键 cvDestroyWindow( "Image" );//销毁窗口 cvReleaseImage( &pImg ); //释放图像 cvReleaseImage( &oImg ); //释放图像 return 0;*/ IplImage* pImg; //声明IplImage指针 IplImage* oImg; CvSize oSize; clock_t start, finish; double duration; CvRect rect ; CvRect rectDes ; rect.height = 120; rect.width = 120; rect.x = 100 ; rect.y = 100 ; rectDes.height = 120; rectDes.width = 120; rectDes.x = 200 ; rectDes.y = 200 ; oSize.width = 1600; oSize.height = 1200; //载入图像 pImg = cvLoadImage( "d:/1.jpg" , 1); oImg = cvLoadImage( "d:/2.jpg" , 1); cvSetImageROI(pImg,rect); cvSetImageROI(oImg,rectDes); cvCopy(pImg,oImg,NULL); cvResetImageROI(oImg); cvSaveImage( "d:/3.jpg" ,oImg,0); printf ( "size of image=:%d" ,oImg->nSize); cvNamedWindow( "Image" , 1 ); //创建窗口 cvShowImage( "Image" , pImg ); //显示图像 cvWaitKey(0); //等待按键 cvDestroyWindow( "Image" ); //销毁窗口 cvReleaseImage( &pImg ); //释放图像 cvReleaseImage( &oImg ); //释放图像 return 0; } <pre class = "brush:cpp" >#include <jni.h> #include <cstdlib> #include <stdexcept> #include <string> #include <sstream> #include <opencv2/core/core_c.h> #include <opencv2/core/core.hpp> #include <opencv2/highgui/highgui_c.h> using namespace cv; /* This is a trivial JNI example where we use a native method * to return a new VM String. See the corresponding Java source * file located at: * * apps/samples/hello-jni/project/src/com/example/HelloJni/HelloJni.java */ extern "C" jstring Java_com_example_hellojni_HelloJni_stringFromJNI( JNIEnv* env, jobject thiz ) { Mat K(3,3,DataType< double >::type); std::stringstream ss; std::string s = "Hello from JNI ! " ; ss << s << K.cols << " " << K.rows; try { if (std:: getenv ( "NON_EXISTENT_ENVIRONMENT_VARIABLE" ) == NULL) throw std::runtime_error( "Hello from JNI (with full C++ support) !" ); } catch (std::exception &ex) { s = ex.what(); } IplImage* pImg; //声明IplImage指针 IplImage* oImg; CvSize oSize; clock_t start, finish; double duration; CvRect rect ; CvRect rectDes ; rect.height = 120; rect.width = 120; rect.x = 100 ; rect.y = 100 ; rectDes.height = 120; rectDes.width = 120; rectDes.x = 200 ; rectDes.y = 200 ; oSize.width = 1600; oSize.height = 1200; //载入图像 pImg = cvLoadImage( "/sdcard/1.jpg" , 1); oImg = cvLoadImage( "/sdcard/2.jpg" , 1); cvSetImageROI(pImg,rect); cvSetImageROI(oImg,rectDes); cvCopy(pImg,oImg,NULL); cvResetImageROI(oImg); cvSaveImage( "/sdcard/3.jpg" ,oImg,0); printf ( "size of image=:%d" ,oImg->imageSize); cvReleaseImage( &pImg ); //释放图像 cvReleaseImage( &oImg ); //释放图像 return env->NewStringUTF(ss.str().c_str()); }