OPENCV的2-10备注

#include "cv.h"#include "highgui.h"#include <stdio.h>// Convert a video to grayscale// argv[1]: input video file// argv[2]: name of new output file//IplImage* doresize(IplImage* in){IplImage* out1 = cvCreateImage(         cvSize( in->width/2, in->height/2 ),        in->depth,        in->nChannels    );    return( out1 );};IplImage* doPyrDown(  IplImage* in,  int       filter = IPL_GAUSSIAN_5x5){    IplImage* out = cvCreateImage(         cvSize( in->width/2, in->height/2 ),        in->depth,        in->nChannels    );    cvPyrDown( in, out );    return( out );};int main( int argc, char* argv[] ) {    cvNamedWindow( "Example2_10", CV_WINDOW_AUTOSIZE );    cvNamedWindow( "Log_Polar", CV_WINDOW_AUTOSIZE );    CvCapture* capture = cvCreateFileCapture(  "D:\\1.wmv" );    if (!capture){        return -1;    }    IplImage* bgr_frame;IplImage* img_pyr;    double fps = cvGetCaptureProperty (        capture,        CV_CAP_PROP_FPS    );printf("fps=%d\n",(int)fps);    CvSize size = cvSize(        (int)cvGetCaptureProperty( capture, CV_CAP_PROP_FRAME_WIDTH),        (int)cvGetCaptureProperty( capture, CV_CAP_PROP_FRAME_HEIGHT)    );        printf("frame (w, h) = (%d, %d)\n",size.width,size.height);    CvVideoWriter* writer = cvCreateVideoWriter(  // On linux Will only work if you've installed ffmpeg development files correctly,         "D:\\33.avi",                               // otherwise segmentation fault.  Windows probably better.        CV_FOURCC('D','X','5','0'),            fps,        size    );    IplImage* logpolar_frame = cvCreateImage(        size,        IPL_DEPTH_8U,        3    );     IplImage* gray_frame = cvCreateImage(        size,        IPL_DEPTH_8U,        1    );    while( (bgr_frame=cvQueryFrame(capture)) != NULL ) {        cvShowImage( "Example2_10", bgr_frame );        //cvLogPolar( bgr_frame, logpolar_frame,  //This is just a fun conversion the mimic's the human visual system        //            cvPoint2D32f(bgr_frame->width/2,        //            bgr_frame->height/2),         //            40,         //            CV_INTER_LINEAR+CV_WARP_FILL_OUTLIERS );  //此语句正确cvCvtColor(bgr_frame, gray_frame,CV_BGR2GRAY);  //将色彩转换为灰度，必须与上面的IplImage* gray_frame搭配使用才行//用上语句转换灰度，则需要将gray_frame通道初始化为1，若为3则发生错误，下句可将gray_frame通道初始化为1为3，因为未指定转换格式CV_BGR2GRAY//cvConvertImage(bgr_frame, gray_frame,CV_CVTIMG_FLIP);//图像180度旋转/****以上两句程序都是讲图像转换为灰度****/img_pyr=doresize(gray_frame); cvResize(gray_frame,img_pyr); //使用cvResize需要先将目标图像初始化好为目标图像的一般即doresize所做的，然后才好将原图像转换为目标图像的一般//img_pyr =doPyrDown(gray_frame,IPL_GAUSSIAN_5x5);  //gray_frame =doPyrDown(gray_frame,IPL_GAUSSIAN_5x5);这里必须重新定义指针，直接用这语句不对        /****以上两句程序都是讲图像缩放为原来的一般****/       cvShowImage( "Log_Polar", img_pyr );        //Sigh, on linux, depending on your ffmpeg, this often won't work ...       cvWriteToAVI( writer, img_pyr );        char c = cvWaitKey(10);        if( c == 27 ) break;    }    cvReleaseVideoWriter( &writer );    cvReleaseImage( &img_pyr );               cvReleaseCapture( &capture );}