CODEWITHSUNDEEP
c++imageopencv
alittlebirdy
alittlebirdy

Reputation: 93

How to get the bytes from opencv image matrix?

If I have an opencv image that I read from a png file like this: 

cv::Mat img = cv::imread("/to/path/test.png");

how do I get that image in bytes? I know using img.data returns an unsigned char* but that is not what I need. Any suggestions?

Upvotes: 0

Views: 288

Answers (1)

Ahmed Khaled Abdelrahman
Ahmed Khaled Abdelrahman

Reputation: 21

If I got your question right, you want, for example, a 250*250 image to return a 250*250 matrix so I would suggest using grey-scale instead of BGR

imgData = cv2.imread(path, 0)

I believe this is written in C++ like this

cv::Mat img = cv::imread(file_name);//It returns a matrix object
cv::Mat graymat;
cvtColor(img, graymat,cv::COLOR_BGR2GRAY);

Upvotes: 1

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