cvtColor 断言失败（OpenCV with C++）
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cvtColor assertion failed ( OpenCV with C++ )
提问by TheNotMe
I have a
我有一个
cv::Mat image;
object, which I loaded an image to from a file, it reads it correctly and all.
对象，我从一个文件中加载了一个图像，它正确地读取了它。
Now I have written a function to transform it to grey color.
现在我编写了一个函数将其转换为灰色。
cv::cvtColor(image, image, CV_RGB2GRAY);
And this error comes up:
这个错误出现了：
OpenCV Error: Assertion failed (scn == 3 || scn == 4) in cvtColor, file /build/buildd/opencv-2.3.1/modules/imgproc/src/color.cpp, line 2834
terminate called after throwing an instance of 'cv::Exception'
what(): /build/buildd/opencv-2.3.1/modules/imgproc/src/color.cpp:2834: error: (-215) scn == 3 || scn == 4 in function cvtColor
what could be the problem?
可能是什么问题呢？
This is how I read the image (through an imagehandler class which has a member cv::Mat m_image)
这就是我读取图像的方式（通过具有成员 cv::Mat m_image 的图像处理程序类）
imagehandler::imagehandler(const std::string& fileName)
: m_image(imread(fileName, CV_LOAD_IMAGE_COLOR))
{
if(!m_image.data)
{
cout << "Failed loading " << fileName << endl;
}
}
回答by Sassa
Try using different dst image:
尝试使用不同的 dst 图像：
cv::Mat grayImage;
cv::cvtColor(image, grayImage, CV_RGB2GRAY);
回答by gedefet
Try image.clone() for coping images
尝试 image.clone() 来处理图像
回答by mosleim
if(!image.empty()) {
//your_code
} else
std::cout<<"Emty "
check the matrix before you convert.
在转换之前检查矩阵。
