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in my programm I have function that takes the image from camera and should pack all data in OpenCV Mat structure. 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. 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 width and height of image , but width and height of my global Mat image_ is 0 . How I can put the data in my global Mat varible correctly? Thank you.

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