Convert a byte arry to OpenCV image in C++
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
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.
cv::Mat reshapedImage = imageWithData.reshape(0, numberOfRows);
cv::Mat GetImageFromMemory(uchar* image, int length, int flag) { std::vector<uchar> data = std::vector<uchar>(image, image + length); cv::Mat ImMat = imdecode(data, flag); return ImMat; }the parameter "flag" refers to the type of image, grayscale, color, any depht .. that has opencv defined