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cv::puttext to write the numbers and cv::imwrite to save the image. Although you could have easily find that on your own...
Google: "opencv print text" first hit: http://docs.opencv.org/modules/core/doc/drawing_functions.html Google: "opencv save image" first hit: http://docs.opencv.org/doc/tutorials/introduction/load_save_image/load_save_image.html

cv::puttext to write the numbers and cv::imwrite to save the image. Although you could have easily find that on your own...