c++ - 使用 opencv 创建灰度视频

Question

我需要在 Mac os X 10.8 上使用 OpenCV 保存来自 GIge 相机的灰度视频。我使用了这段代码:

 namedWindow("My video",CV_WINDOW_AUTOSIZE);
 Size frameSize(659, 493);
 VideoWriter oVideoWriter ("MyVideo.avi",-1, 30, frameSize, false);

 While(1)
 {
 ...
     Mat Image=Mat(Size(GCamera.Frames[Index].Width,GCamera.Frames[Index].Height),CV_8UC1,GCamera.Frames[Index].ImageBuffer);

     oVideoWriter.write(Image);
 ...   
 }

我遇到了这个错误:

OpenCV Error: Assertion failed (scn == 3 || scn == 4) in cvtColor, file /Users/rosa/OpenCV-2.4.3/modules/imgproc/src/color.cpp, line 3270 libc++abi.dylib: terminate called throwing an exception The program has unexpectedly finished.

Answer 1

我是这样做的:

 VideoWriter oVideoWriter ("MyVideo.avi",CV_FOURCC('M','J','P','G'), 30, frameSize);

 While(1)
 {
     Mat Image=Mat(Size(GCamera.Frames[Index].Width,GCamera.Frames[Index].Height),CV_8UC1,GCamera.Frames[Index].ImageBuffer);
     Mat colorFrame;
     cvtColor(Image, colorFrame, CV_GRAY2BGR);
     oVideoWriter.write(colorFrame);
 }