C++ opencv从相机数据创建mat
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opencv create mat from camera data
提问by M.K.
in my programm I have function that takes the image from camera and should pack all data in OpenCV Matstructure. From the camera I get width, height and unsigned char*to the image buffer. My Question is how I can create Mat from this data, if I have global Mat variable. The type for Mat structure I took CV_8UC1.
在我的程序中，我具有从相机获取图像的功能，并且应该将所有数据打包成OpenCV Mat结构。从相机我得到宽度、高度和unsigned char*图像缓冲区。我的问题是，如果我有全局 Mat 变量，我如何从这些数据创建 Mat。我采用了 CV_8UC1 的 Mat 结构类型。
Mat image_;
function takePhoto() {
unsigned int width = getWidthOfPhoto();
unsinged int height = getHeightOfPhoto();
unsinged char* dataBuffer = getBufferOfPhoto();
Mat image(Size(width, height), CV_8UC1, dataBuffer, Mat::AUTO_STEP);
printf("width: %u\n", image.size().width);
printf("height: %u\n", image.size().height);
image_.create(Size(image.size().width, image.size().height), CV_8UC1);
image_ = image.clone();
printf("width: %u\n", image_.size().width);
printf("height: %u\n", image_.size().height);
}
When I test my program, I get right widthand heightof image, but widthand heightof my global Mat image_is 0. How I can put the data in my global Matvarible correctly?
当我测试的程序，我马上width和height的image，但width和height我的全球垫image_是0。如何Mat正确地将数据放入我的全局变量中？
Thank you.
谢谢你。
回答by karlphillip
Unfortunately, neither clone()nor copyTo()successfully copy the values of width/height to another Mat. At least on OpenCV 2.3! It's a shame, really.
不幸的是，既没有clone()也没有copyTo()成功地将宽度/高度的值复制到另一个垫子上。至少在 OpenCV 2.3 上！真的很可惜。
However, you could solve this issue and simplify your code by making the function return the Mat. This way you won't need to have a global variable:
但是，您可以通过使函数返回Mat. 这样你就不需要全局变量了：
Mat takePhoto()
{
unsigned int width = getWidthOfPhoto();
unsigned int height = getHeightOfPhoto();
unsigned char* dataBuffer = getBufferOfPhoto();
Mat image(Size(width, height), CV_8UC1, dataBuffer, Mat::AUTO_STEP);
return Mat;
}
int main()
{
Mat any_img = takePhoto();
printf("width: %u\n", any_img.size().width);
printf("height: %u\n", any_img.size().height);
}
