C++ unsigned char ** 到 opencv mat
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unsigned char ** to opencv mat
提问by Oliver9523
I'm almost there but I can't quite understand how to convert
我快到了，但我不太明白如何转换
unsigned char ** to a cv::Mat
I know that the .data part of a cv::Mat is uchar*
我知道 cv::Mat 的 .data 部分是 uchar*
I'm using a function that returns and image in the form of...
我正在使用一个以...的形式返回和图像的函数
unsigned char ** output;
But the rest of my code uses cv::Mat's. I don't have the source for the lib I'm using either so don't really know what it's doing.
但我的其余代码使用 cv::Mat 的。我也没有我正在使用的库的来源，所以我真的不知道它在做什么。
EditThanks for the help guys, I've done this...
编辑感谢您的帮助，我已经完成了...
cv::Mat TempMat = cv::Mat(h, w, CV_8UC1, *output);
imshow("this is a test",TempMat);
but the image is black so I now need to find out if there's actually anything there or not.
但图像是黑色的，所以我现在需要找出那里是否真的有任何东西。
Sorry for lack of research i'm on a tight deadline, no it's not homework, trying to get something ready to show results to a Professor!
抱歉缺乏研究，我的截止日期很紧，不，这不是家庭作业，试图准备一些东西向教授展示结果！
回答by ArtemStorozhuk
You have to use Mat constructorwith a pointer to data:
您必须使用带有指向数据的指针的Mat 构造函数：
// constructor for matrix headers pointing to user-allocated data
Mat(int _rows, int _cols, int _type, void* _data, size_t _step=AUTO_STEP);
Mat(Size _size, int _type, void* _data, size_t _step=AUTO_STEP);
You have to convert void**to void*and after this use it.
您必须转换void**为void*并在此之后使用它。
回答by AJ_Nur
maybe you should remove *at
也许你应该删除*在
cv::Mat TempMat = cv::Mat(h, w, CV_8UC1, *output);
make it just like this:
让它像这样：
cv::Mat TempMat = cv::Mat(h, w, CV_8UC1, output);
