EmguCV学习——视频与图片互转
其实视频转图片在上篇文章中已经有些眉目了，其实就是按帧读取视频，然后把帧保存就ok。然后自己再加个进度条美化一下。。。这代码简单易懂，还是直接上代码吧。
视频转图片
1 /// <summary> 2 /// 视频转换为图片 3 /// </summary> 4 /// <param name="path"></param> 5 public void Video2Image(object path) 6 { 7 try 8 { 9 //判断文件夹是否存在 10 if (!Directory.Exists(filepath + filename + "\\")) 11 { 12 try 13 { 14 //不存在 创建文件夹 15 Directory.CreateDirectory(filepath + filename + "\\"); 16 } 17 catch { } 18 } 19 20 IntPtr CatchFrame = CvInvoke.cvCreateFileCapture(path.ToString()); 21 // 得到总帧数 22 var count = CvInvoke.cvGetCaptureProperty(CatchFrame, Emgu.CV.CvEnum.CAP_PROP.CV_CAP_PROP_FRAME_COUNT); 23 // 视频宽度 24 int wd = (int)CvInvoke.cvGetCaptureProperty(CatchFrame, Emgu.CV.CvEnum.CAP_PROP.CV_CAP_PROP_FRAME_WIDTH); 25 // 视频高度 26 int hg = (int)CvInvoke.cvGetCaptureProperty(CatchFrame, Emgu.CV.CvEnum.CAP_PROP.CV_CAP_PROP_FRAME_HEIGHT); 27 //// 当前帧位置 28 //CvInvoke.cvGetCaptureProperty(CatchFrame, Emgu.CV.CvEnum.CAP_PROP.CV_CAP_PROP_POS_FRAMES); 29 //// 帧频 30 //CvInvoke.cvGetCaptureProperty(CatchFrame, Emgu.CV.CvEnum.CAP_PROP.CV_CAP_PROP_FPS); 31 32 IntPtr FrameImg; 33 int i = 0; 34 35 IntPtr grayImg = CvInvoke.cvCreateImage(new Size(wd, hg), Emgu.CV.CvEnum.IPL_DEPTH.IPL_DEPTH_8U, 1); 36 while ((FrameImg = CvInvoke.cvQueryFrame(CatchFrame)) != IntPtr.Zero) 37 { 38 //此处我是转为灰度图，保存灰度图，小伙伴可以直接保存FrameImg 39 CvInvoke.cvCvtColor(FrameImg, grayImg, Emgu.CV.CvEnum.COLOR_CONVERSION.BGR2GRAY); 40 41 string picname = filepath + filename + "\\image" + (++i) + ".jpg"; 42 43 CvInvoke.cvSaveImage(picname, grayImg, IntPtr.Zero); 44 45 } 46 47 } 48 catch (Exception ex) 49 { 50 MessageBox.Show(ex.ToString()); 51 } 52 53 }
好吧，重要的是图片转视频，这里涉及到解码器。我需要转换的是mp4格式的视频，所以我选择的解码器为Xvid。
1 /// <summary> 2 /// 图片转换为视频 3 /// </summary> 4 public void Image2Video() 5 { 6 try 7 { 8 var files = Directory.GetFiles(filepath, "*.jpg"); 9 int count = files.Count(); 10 int isColor = 1; 11 //帧频 12 int fps = 5; 13 int i = 0; 14 string picname = files[0]; 15 Bitmap map = new Bitmap(picname); 16 int frameW = map.Width; 17 int frameH = map.Height; 18 string videoname = filepath + "\\out.mp4"; 19 var writer = CvInvoke.cvCreateVideoWriter(videoname, CvInvoke.CV_FOURCC('X', 'V', 'I', 'D'), fps, new System.Drawing.Size(frameW, frameH), isColor); 20 map.Dispose(); 21 CvInvoke.cvNamedWindow("mainWin"); 22 while (i < count) 23 { 24 picname = files[i]; 25 var img = CvInvoke.cvLoadImage(picname, Emgu.CV.CvEnum.LOAD_IMAGE_TYPE.CV_LOAD_IMAGE_ANYCOLOR); 26 if (img == null) 27 { 28 CvInvoke.cvReleaseImage(ref img); 29 continue; 30 } 31 CvInvoke.cvShowImage("mainWin", img); 32 bool flag = CvInvoke.cvWriteFrame(writer, img); 33 if (!flag) 34 { 35 CvInvoke.cvReleaseImage(ref img); 36 continue; 37 } 38 CvInvoke.cvWaitKey(20); 39 CvInvoke.cvReleaseImage(ref img); 40 i++; 41 } 42 CvInvoke.cvReleaseVideoWriter(ref writer); 43 CvInvoke.cvDestroyWindow("mainWin"); 44 } 45 catch (Exception e) 46 { 47 MessageBox.Show(e.ToString()); 48 } 49 }
That's all!
种一棵树最好的时间是十年前，其次是现在。
