C++ OpenCV 错误：断言失败 (scn == 3 || scn == 4) in cv:: cvtColor, file ..\..\..\..\opencv\modules\imgproc\src\color.cpp, line 3737
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OpenCV Error: Assertion failed (scn == 3 || scn == 4) in cv:: cvtColor, file ..\..\..\..\opencv\modules\imgproc\src\color.cpp, line 3737
提问by Joissa.R
Hi I am trying to run this sample code from OpenCV:
嗨，我正在尝试从 OpenCV 运行此示例代码：
#include "opencv2\opencv.hpp"
using namespace cv;
int main(int, char**)
{
VideoCapture cap(0); // open the default camera
if (!cap.isOpened()) // check if we succeeded
return -1;
Mat edges;
namedWindow("edges", 1);
for (;;)
{
Mat frame;
cap >> frame; // get a new frame from camera
cvtColor(frame, edges, CV_BGR2GRAY);
GaussianBlur(edges, edges, Size(7, 7), 1.5, 1.5);
Canny(edges, edges, 0, 30, 3);
imshow("edges", edges);
if (waitKey(30) >= 0) break;
}
// the camera will be deinitialized automatically in VideoCapture destructor
return 0;
}
I am currently using a Windows 7 x64 BootCamp on a Macbook Pro. I'm running this code with Visual Studios 2013 and OpenCV 2.4.9.
我目前在 Macbook Pro 上使用 Windows 7 x64 BootCamp。我正在使用 Visual Studios 2013 和 OpenCV 2.4.9 运行此代码。
This is how I've set up my Config Properties:
这是我设置配置属性的方式：
VC++ Directories: Include Directories: H:\opencv\build\include;$(IncludePath)
Linker:General:Additional Library Directories: H:\opencv\build\x64\vc12\lib;%(AdditionalLibraryDirectories)
Linker:Input:Additional Dependencies: opencv_calib3d249.lib;opencv_contrib249.lib;opencv_core249.lib;opencv_features2d249.lib;opencv_flann249.lib;opencv_gpu249.lib;opencv_highgui249.lib;opencv_imgproc249.lib;opencv_legacy249.lib;opencv_ml249.lib;opencv_nonfree249.lib;opencv_objdetect249.lib;opencv_ocl249.lib;opencv_photo249.lib;opencv_stitching249.lib;opencv_superres249.lib;opencv_ts249.lib;opencv_video249.lib;opencv_videostab249.lib;%(AdditionalDependencies)
When I click on Local Windows Debugger in Release x64 mode I get the following error from Visual Studios:
当我在 Release x64 模式下单击本地 Windows 调试器时，我从 Visual Studios 收到以下错误：
First-chance exception at 0x000007FEFD21B3DD in Project3.exe: Microsoft C++ exception: cv::Exception at memory location 0x000000000019A8A0.
If there is a handler for this exception, the program may be safely continued.
Project3.exe 中 0x000007FEFD21B3DD 处的第一次机会异常：Microsoft C++ 异常：内存位置 0x000000000019A8A0 处的 cv::Exception。
如果有这个异常的处理程序，程序可以安全地继续。
When I click Break instead (scared to press Continue), a window named Edges does pop up and the camera does turn on since the green light turns on. But I also get the following error in the command window:
当我改为单击 Break（害怕按 Continue）时，会弹出一个名为 Edges 的窗口，并且由于绿灯亮起，相机确实打开了。但我也在命令窗口中收到以下错误：
OpenCV Error: Assertion failed (scn == 3 || scn == 4) in cv:: cvtColor, file ........\opencv\modules\imgproc\src\color.cpp, line 3737
OpenCV 错误：断言失败 (scn == 3 || scn == 4) in cv:: cvtColor, file ........\opencv\modules\imgproc\src\color.cpp, line 3737
I'm pretty new to C++ and Visual Studios, any help would be appreciated. Thanks in advance!
我对 C++ 和 Visual Studios 很陌生，任何帮助将不胜感激。提前致谢！
采纳答案by Miki
From the conversation in the comments to the question, we saw that VideoCapturegives frame in grayscale. So the call to cvtColorcaused the crash.
从评论中的对话到问题，我们看到VideoCapture灰度给出了框架。所以调用cvtColor导致崩溃。
...
Mat frame;
cap >> frame; // frame is already CV_8UC1
//cvtColor(frame, edges, CV_BGR2GRAY); // so don't to convert here, or crash!
edges = frame.clone();
...
