/************************
@HJ 2017/3/30 参考http://blog.sina.com.cn/s/blog_4b0020f301010qcz.html修改的代码
@主要调用opencv相关函数，从视频流中提取出图片序列
@需要注意的问题：
cvReleaseImage(&pImg)释放内存出错的两种情况：具体可以参考http://www.cnblogs.com/grandyang/p/4615036.html
1）从摄像头获取的图片不能被修改和释放，所以如果我们对捕获的图像调用cvReleaseImage就会出错
2）使用完了CvCapture，需要用cvReleaseCapture来释放内存，那么我们就不需要再用cvReleaseImage来释放每一张图像的内存了
******************************/
#include <opencv2opencv.hpp>
#include <highgui.h>
#include <iostream>
#include <io.h>//for _acess()
#include <string>
const int picNum = 25;//设置所想要的图片序列数量
char* videoName1 = "C:\TEST\opencv\V2P2V\V2P2V\V2P2V\1.wmv";//输入的视频绝对路径
char* outDir1 = "C:\TEST\opencv\V2P2V\V2P2V\V2P2V\img\";//输出图像的绝对路径
int VideoToImage(char* videoName, char* outDir, char* imgExt, int picNum);//视频转化为图片序列MaxFrameCount可以填写你想需要的图片序列格式
//将视频转换为图片序列 返回由视频分解得到的图片总帧数
int VideoToImage(char* videoName, char* outDir, char* imgExt, int picNum)
{
CvCapture *cap = cvCaptureFromFile(videoName);
if (cap == NULL)
{
return 0;
}
if (_access(outDir, 0) == -1)
{
std::cout << "the ouput directory does not exist!" << std::endl;
cvWaitKey();
}
char cur_fn[255];//保存当前帧所得图片的文件名
IplImage* pImg = NULL;
int frame = 0;
while ((pImg = cvQueryFrame(cap)) != NULL && (frame<picNum))
{
frame++;
strcpy(cur_fn, "");
sprintf(cur_fn, "%s%d%s", outDir, frame, imgExt);//将outDir, frame, imgExt三个数据拼接然后放在cur_fn中
cvSaveImage(cur_fn, pImg, NULL);
}
//cvReleaseImage(&pImg);//从摄像头获取的图片不能被修改和释放，所以如果我们对捕获的图像调用cvReleaseImage就会出错
cvReleaseCapture(&cap);
return 1;
}
int main(){
//视频转图片
if (int images = VideoToImage(videoName1, outDir1, ".jpg", picNum)){//输入的视频绝对路径、输出图像的绝对路径、存储图像的格式.jpg,图像序列数据
std::cout << "ALL pictures have been extracted from the video." << std::endl;
}
else std::cout << "the work is failed." << std::endl;
cvWaitKey();
}
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jpg图片序列，转化成avi格式视频：
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <iostream>
#include <io.h>
using namespace cv;
using namespace std;
//将图片序列转换为视频,返回视频帧数 目前OpenCV只支持输出AVI格式的视频
int ImageToVideo(char* outDir, char* videoName, char* inputDir, int startFrame, int endFrame, int imgW, int imgH, char* imgExt, double fps, int isColor, int fourcc)
{
//判断输入文件夹是否存在
if (_access(inputDir, 0) == -1)
{
std::cout << "the input directory does not exist!" << std::endl;
return 0;
}
//判断输出文件夹是否创建若没有则创建；若为NULL则默认当前工作目录
char fullVideoName[255];//输出视频的完整文件名：路径+文件名
strcpy(fullVideoName, "");
if (outDir == NULL)
{
sprintf(fullVideoName, "%s", videoName);
}
int frameCount = 0;
CvVideoWriter *pWriter = NULL;
CvSize size = cvSize(imgW, imgH);
pWriter = cvCreateVideoWriter(videoName, fourcc, fps, size, isColor);//CREATE WRITER
IplImage *pImg = NULL;
char cur_fn[255];//表示某张图片的路径
while (startFrame <= endFrame)
{
strcpy(cur_fn, "");
sprintf(cur_fn, "%s%d%s", inputDir, startFrame, imgExt);//need to change
pImg = cvLoadImage(cur_fn, isColor);
if (!pImg)
{
std::cout << "can't open an image file" << std::endl;
return frameCount;
}
cvWriteFrame(pWriter, pImg);
cvWaitKey(1);
std::cout << "Write frame " << startFrame << std::endl;
startFrame++;
cvReleaseImage(&pImg);
frameCount++;
}
cvReleaseVideoWriter(&pWriter);
rename(videoName, fullVideoName);//移动文件到指定文件夹
return frameCount;
}
int main()
{ //将从摄像头中读到的图像序列转换为.avi视频
//VideoCapture capture(0);
//VideoWriter writer("VideoTest.avi", CV_FOURCC('M', 'J', 'P', 'G'), 25.0, Size(640, 480));
//Mat frame;
//while (capture.isOpened())
//{
// capture >> frame;
// writer << frame;
// imshow("video", frame);
// if (cvWaitKey(20) == 27)
// {
// break;
// }
//}
char* outDir = "C:\TEST\opencv\video2pic\viedo2pic\viedo2pic\img\";
char* videoName = "110.avi";
char* inputDir = "C:\TEST\opencv\video2pic\viedo2pic\viedo2pic\img\";
int startFrame =1;
int endFrame = 100;
int imgW = 320;
int imgH = 240;
char* imgExt=".jpg";
double fps = 15;
ImageToVideo( outDir, videoName, inputDir, startFrame, endFrame, imgW, imgH, imgExt, fps, 1, CV_FOURCC('D', 'I', 'V', 'X'));
return 0;
}