1 #include <highgui.h> 2 #include <cv.h> 3 4 #pragma comment (lib,"opencv_calib3d231d.lib") 5 #pragma comment (lib,"opencv_contrib231d.lib") 6 #pragma comment (lib,"opencv_core231d.lib") 7 #pragma comment (lib,"opencv_features2d231d.lib") 8 #pragma comment (lib,"opencv_flann231d.lib") 9 #pragma comment (lib,"opencv_gpu231d.lib") 10 #pragma comment (lib,"opencv_haartraining_engined.lib") 11 #pragma comment (lib,"opencv_highgui231d.lib") 12 #pragma comment (lib,"opencv_imgproc231d.lib") 13 #pragma comment (lib,"opencv_legacy231d.lib") 14 #pragma comment (lib,"opencv_ml231d.lib") 15 #pragma comment (lib,"opencv_objdetect231d.lib") 16 #pragma comment (lib,"opencv_ts231d.lib") 17 #pragma comment (lib,"opencv_video231d.lib") 18 19 /* 20 *《学习OpenCV》第二章第四题 21 * 从摄像机读入视频数据，并做缩放变换，将变换结果显示在窗口中。 22 * 完成时间：22:18 3/31 星期日 2013 23 */ 24 25 IplImage * doPryDown(IplImage * in, int filter = IPL_GAUSSIAN_5x5) 26 { 27 IplImage * out; 28 if(in->width % 2 == 0 && in->height % 2 == 0) 29 { 30 out = cvCreateImage( cvSize( in->width/2, in->height/2 ), 31 in->depth, in->nChannels); 32 cvPyrDown( in, out ); 33 34 return out; 35 } 36 else 37 { 38 out = cvCreateImage( cvSize( (in->width+1) / 2, (in->height+1)/2 ), 39 in->depth, in->nChannels); 40 cvPyrDown( in, out ); 41 42 return out; 43 } 44 45 } 46 47 int main() 48 { 49 CvCapture* capture; 50 51 // 选择第二个摄像头 52 capture = cvCreateCameraCapture(0); 53 if(capture == NULL) 54 { 55 printf("Camera error.\texit.\n"); 56 exit(-1); 57 } 58 59 // 创建窗口 60 cvNamedWindow("Camera", 0); 61 62 IplImage *frame = cvQueryFrame(capture); 63 IplImage *frame_pyrdown; 64 65 if (!frame) 66 { 67 return 0; 68 } 69 70 while(1) 71 { 72 // 读数据 73 frame = cvQueryFrame(capture); 74 75 if (!frame) 76 { 77 break; 78 } 79 80 // 原始尺寸 81 printf("original size: {%d %d}\n", frame->width, frame->height); 82 // 缩放变换 83 frame_pyrdown = doPryDown( frame, 7 ); 84 // 变换后的尺寸 85 printf("after pyrdown size: {%d %d}\n", frame_pyrdown->width, frame_pyrdown->height); 86 // 显示出来 87 cvShowImage("Camera", frame_pyrdown); 88 89 char c = cvWaitKey(50); 90 if (c == 27) 91 { 92 break; 93 } 94 } 95 96 // 释放资源 97 cvReleaseCapture(&capture); 98 cvReleaseImage( &frame); 99 cvReleaseImage( &frame_pyrdown); 100 cvDestroyWindow("Camera"); 101 102 return 0; 103 }
运行结果：
