• [学习OpenCV攻略][010][写入AVI文件]


    cvSize(文件宽度,文件高度)

    通过图片或视频文件的宽高得到尺寸信息,返回值是CvSize

    cvCreateVideoWriter(输出文件名,编码格式,帧率,图像大小)

    通过设置输出视频的格式信息得到输出的视频,返回值是CvVideoWriter

    CV_FOURCC(编码格式)

    设置编码格式,('D','X','5','0') mpeg4格式,('M','J','P','G') mjpeg

    cvWriteToAVI(输出视频流,输入视频流)

    将输出视频流(IplImage类型)写成AVI格式到输出视频流(CvVideoWriter类型)中

    cvReleaseVideoWriter(视频写入器)

    释放视频写入器

    #include <stdio.h>
    #include "cv.h"
    #include "highgui.h"
    
    int main(int argc, char **argv){
    	cvNamedWindow("hello", CV_WINDOW_AUTOSIZE);
    	cvNamedWindow("log_polar", CV_WINDOW_AUTOSIZE);
    	
    	CvCapture *capture = cvCreateFileCapture(argv[1]);
    	if(!capture){
    		return -1;
    	}
    	
    	double fps = cvGetCaptureProperty(capture, CV_CAP_PROP_FPS);
    	printf("fps = %d
    ", (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)
    ", size.width, size.height);
    	
    	CvVideoWriter *write = cvCreateVideoWriter(argv[2], CV_FOURCC('M','J','P','G'), fps, size);   //CV_FOURCC('D','X','5','0') mpeg格式 CV_FOURCC('M','J','P','G') mjpeg格式
    	
    	IplImage *logpolar_frame = cvCreateImage(size, IPL_DEPTH_8U, 3);
    	IplImage *gray_frame = cvCreateImage(size, IPL_DEPTH_8U, 1);
    	
    	IplImage *bgr_frame;
    	while(1){
    		bgr_frame = cvQueryFrame(capture);
    		if(!bgr_frame){
    			break;
    		}
    		
    		cvShowImage("hell0", bgr_frame);
    		
    		cvConvertImage(bgr_frame, gray_frame, CV_RGB2GRAY);
    		
    		cvLogPolar(
    			bgr_frame, 
    			logpolar_frame, 
    			cvPoint2D32f(bgr_frame->width/2,bgr_frame->height/2), 
    			40, 
    			CV_INTER_LINEAR+CV_WARP_FILL_OUTLIERS
    		);
    		cvShowImage("log_polar", logpolar_frame);
    		
    		cvWriteToAVI(write, logpolar_frame);   //输出的文件名为.avi格式
    		
    		char c = cvWaitKey(10);
    		if(c == 27){
    			break;
    		}
    	}
    	
    	cvReleaseVideoWriter(&write);
    	cvReleaseImage(&gray_frame);
    	cvReleaseImage(&logpolar_frame);
    	cvReleaseCapture(&capture);
    	cvDestroyWindow("hello");
    	cvDestroyWindow("log_polar");
    	
    	return 0;
    }
    
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  • 原文地址:https://www.cnblogs.com/d442130165/p/4921006.html
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