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How to create and read image using open CV

asked 2014-01-10 19:35:36 -0500

updated 2014-01-11 04:18:14 -0500

berak gravatar image

How to create an 400 X 400 image using C/C++ and write RGB vlues to each pixel and save it and also how to read the saved image by pixel to pixel ? Any help would be appreciated

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answered 2014-01-11 04:01:09 -0500

tenta4 gravatar image

cv::Mat img(400, 400, CV_8UC3);

// fill by white

img = cv::Scalar(255, 255, 255);

// change the pixel

int x = 50; int y = 100;

img.data[(y * img.size().width + x) * 3] = 0; // r

img.data[(y * img.size().width + x) * 3+1] = 0; //g

img.data[(y * img.size().width + x) * 3+2] = 0; //b

// write

cv::imwrite("myimg.png", img);

// open

cv::Mat opened = cv::imread("myimg.png");

cv::imshow("opened", opened);

cv::waitKey(0);

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Comments

How can we loop in through to read each pixel by its RGB value and same way to write each RGB pixel ?

nooby2252 gravatar imagenooby2252 ( 2014-01-11 18:09:02 -0500 )edit

It's seems you beginner in programming, if you can't to implement a loop like for x {for y}

tenta4 gravatar imagetenta4 ( 2014-01-13 05:50:11 -0500 )edit
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Asked: 2014-01-10 19:35:36 -0500

Seen: 142 times

Last updated: Jan 11 '14