OpenCV学习笔记04--图片和视频的保存

例六：保存图片

新加入的函数：

1.cvSaveImage(outImageName, outImage);

  用cvSaveImage(outImageName, outImage)即可方便的保存图片。当然为了安全，可以先将原图进行拷贝，再进行保存

2.cvCopy(frame, outImage, NULL);

  将原图拷贝到新图 

 

#include "stdafx.h"   #include"highgui.h"   #include"stdio.h"   int main(int argc, char** argv){cvNamedWindow("vedio");CvCapture* capture;capture = cvCreateCameraCapture(0);IplImage* frame;char keyCode;while ((keyCode = cvWaitKey(30)))// 每隔30ms捕捉一次视频图像 {frame = cvQueryFrame(capture);if (!frame){ break; }if (keyCode == 27){ break; } //表示按下了ESC键，退出  if (keyCode == 13)//表示按下了回车键，此时应当保存照片  {//IplImage* outImage = cvCreateImage(cvGetSize(frame), frame->depth, frame->nChannels);//cvCopy(frame, outImage, NULL); cvSaveImage("test.jpg", frame);//保存图片printf(" 恭喜你，保存图片成功！\n");}cvShowImage("vedio", frame);}cvReleaseImage(&frame);cvDestroyAllWindows();return 0;}

 

例七：保存视频文件

一：将视频文件保存为AVI格式文件

本例新加入的几个函数：

1.cvCreateVideoWriter("D:\\output.avi", CV_FOURCC('M', 'J', 'P', 'G'), fps, size);

用来创建一个视频写入器结构来保存视频，参数分别为输出的文件名，编码方式，帧率。视频流帧的大小。OpenCV用CV_FOURCC来指定编码格式。而fps和size和读入的文件保持一致，所以分别用cvGetCaptureProperty(capture, CV_CAP_PROP_FPS)得到帧率即每秒钟显示的帧数，用cvSize((int)cvGetCaptureProperty(capture, CV_CAP_PROP_FRAME_WIDTH), (int)cvGetCaptureProperty(capture, CV_CAP_PROP_FRAME_HEIGHT))得到输出视频流帧的大小。

2.cvWriteFrame(writer, logpolar_frame);

  将一帧写入视频写入器结构，参数分别为视频写入器结构和待写入的图像

3.void cvLogPolar( const CvArr* src, CvArr* dst, CvPoint2D32f center, double M, int flags=CV_INTER_LINEAR+CV_WARP_FILL_OUTLIERS );

把图像映射到极指数空间。 src 输入图像。 dst 输出图像。 center 变换的中心，输出图像在这里最精确。M 是指幅度的尺度参数。使用此函数模拟真实的人眼效果。

 

 

 

#include "stdafx.h"#include "highgui.h"#include "cv.h" int _tmain(int argc, _TCHAR* argv[]){CvCapture* capture = cvCreateFileCapture("D:\\1.wmv");if (!capture) {return -1;}IplImage* bgr_frame;double fps = cvGetCaptureProperty(capture, CV_CAP_PROP_FPS);  //得到帧率,每秒钟显示的帧数CvSize size = cvSize((int)cvGetCaptureProperty(capture, CV_CAP_PROP_FRAME_WIDTH), (int)cvGetCaptureProperty(capture, CV_CAP_PROP_FRAME_HEIGHT));//输出视频流帧的大小CvVideoWriter *writer = cvCreateVideoWriter("D:\\output.avi", CV_FOURCC('M', 'J', 'P', 'G'), fps, size);//创建视频写入器结构来保存视频，参数分别为输出的文件名，编码方式，帧率。视频流帧的大小// IplImage* logpolar_frame = cvCreateImage(size, IPL_DEPTH_8U, 3);while ((bgr_frame = cvQueryFrame(capture)) != NULL){  //    cvLogPolar(bgr_frame, logpolar_frame, cvPoint2D32f(bgr_frame->width / 2, bgr_frame->height / 2), 40, CV_INTER_LINEAR + CV_WARP_FILL_OUTLIERS);//cvWriteFrame(writer, logpolar_frame);cvWriteFrame(writer, bgr_frame);   //将一帧写入视频写入器结构}cvReleaseVideoWriter(&writer);//cvReleaseImage(&logpolar_frame);cvReleaseCapture(&capture);return 0;}

 

 

 

 

 

二：将摄像头采集到的信息保存为AVI格式文件

 

 

<pre name="code" class="cpp">#include "stdafx.h"#include "highgui.h"#include "cv.h"int _tmain(int argc, _TCHAR* argv[]){cvNamedWindow("test", 0);CvCapture* capture = cvCreateCameraCapture(0);if (!capture) {return -1;}IplImage* bgr_frame;CvSize size=cvSize((int)cvGetCaptureProperty(capture, CV_CAP_PROP_FRAME_WIDTH),                     （int）cvGetCaptureProperty(capture, CV_CAP_PROP_FRAME_HEIGHT));//输出视频流帧的大小CvVideoWriter *writer = cvCreateVideoWriter("D:\\output.avi", CV_FOURCC('M', 'J', 'P', 'G'), 20, size);//创建视频写入器结构来保存视频，参数分别为输出的文件名，编码方式，帧率。视频流帧的大小while ((bgr_frame = cvQueryFrame(capture)) != NULL){bgr_frame = cvQueryFrame(capture);cvShowImage("test", bgr_frame);int c = cvWaitKey(50);  if (c == 27) break;//IplImage* logpolar_frame = cvCreateImage(size, IPL_DEPTH_8U, 3);//     cvLogPolar(bgr_frame, logpolar_frame, cvPoint2D32f(bgr_frame->width / 2, bgr_frame->height / 2), 40, CV_INTER_LINEAR + CV_WARP_FILL_OUTLIERS);cvWriteFrame(writer, bgr_frame);   //将一帧写入视频写入器结构}cvReleaseVideoWriter(&writer);cvReleaseImage(&logpolar_frame);cvReleaseCapture(&capture);return 0;}