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》第二章第三题 21 * 从摄像机读入视频数据，并做缩放变换，将结果存入磁盘。 22 * 完成时间：22:01 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 48 int main() 49 { 50 CvCapture* capture; 51 52 // 选择第二个摄像头 53 capture = cvCreateCameraCapture(0); 54 if(capture == NULL) 55 { 56 printf("Camera error.\texit.\n"); 57 exit(-1); 58 } 59 60 // 创建窗口 61 cvNamedWindow("Camera", 0); 62 63 IplImage *frame = cvQueryFrame(capture); 64 IplImage *frame_pyrdown; 65 66 CvVideoWriter* writer = cvCreateAVIWriter( "video_record.avi", 67 CV_FOURCC( 'M', 'J', 'P', 'G' ), 10, cvGetSize(frame), 1); 68 69 if (!frame) 70 { 71 return 0; 72 } 73 74 while(1) 75 { 76 // 读数据 77 frame = cvQueryFrame(capture); 78 79 if (!frame) 80 { 81 break; 82 } 83 84 // 原始尺寸 85 printf("original size: {%d %d}\n", frame->width, frame->height); 86 // 缩放变换 87 frame_pyrdown = doPryDown( frame, 7 ); 88 // 变换后的尺寸 89 printf("after pyrdown size: {%d %d}\n", frame_pyrdown->width, frame_pyrdown->height); 90 // 写入视频文件 91 cvWriteFrame( writer, frame_pyrdown ); 92 } 93 94 // 释放资源 95 cvReleaseCapture(&capture); 96 cvReleaseImage( &frame); 97 cvReleaseImage( &frame_pyrdown); 98 cvReleaseVideoWriter( &writer ); 99 cvDestroyWindow("Camera"); 100 101 return 0; 102 }
程序运行结果：
保存在磁盘上的文件：
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