Convert a byte arry to OpenCV image in C++

问题:

I have a byte array that represents a .jpg file that I want to convert directly to an OpenCV Mat object.

I have something like

byte* data; // Represents a JPG that I don't want to disk and then read. // What goes here to end up with the following line? cv::Mat* image_representing_the_data;

回答1:

the previously mentioned method will work fine, if it's PIXEL data.

if instead, you have a whole jpg FILE in memory, headers, compression, and all, it won't work.

in that case you want:

Mat img = imdecode(data);

which will do the same as imread(), only from memory, not from a filename

回答2:

as @bob mention, this can be done using the Mat constructor.

byte *data; cv::Mat imageWithData = cv::Mat(sizeOfData, 1, CV_8U, data).clone();

After you have created this matrix, call the reshape function with the number of rows in the image.

Mat reshapedImage = imageWithData.reshape(0, numberOfRows);

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