puttext with black background

asked 2014-02-05 01:51:16 -0600

Flart

133 ●1 ●3 ●9

updated 2017-08-01 11:29:19 -0600

sturkmen

6772 ●3 ●48 ●79 https://github.com/stu...

I want to write value on picture using puttext with black background. Code:

rectangle(frame, Rect(
     Point(50,50) + Point(0,-height), 
     Point(50,50) + Point(width,0)), 
     Scalar(0,0,0),-1);
putText(frame, Tostr(value), Point(50,50),1,1,Scalar(255,255,255),2);

But change of capacity value leads change of required width. How this width is determined, or did I miss some params of putText, which resolve my issue?

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Actually your question is quite unclear to me. You are drawing a rectangle based on the width of the text that will be displayed on it. The width of putText is determined by the amount of characters that need to be displayed. Take a standard distance for each character (just do some tests to get a good guess) and use that as size? How are you calculating width and heigth for the moment?

StevenPuttemans ( 2014-02-05 02:17:58 -0600 )edit

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void setLabel(cv::Mat& im, const std::string label, const cv::Point & or) { int fontface = cv::FONT_HERSHEY_SIMPLEX; double scale = 0.4; int thickness = 1; int baseline = 0; cv::Size text = cv::getTextSize(label, fontface, scale, thickness, &baseline); cv::rectangle(im, or + cv::Point(0, baseline), or + cv::Point(text.width, -text.height), CV_RGB(0,0,0), CV_FILLED); cv::putText(im, label, or, fontface, scale, CV_RGB(255,255,255), thickness, 8); } cv::Mat src = cv::imread(.......); setLabel(src,"here is the text to display", cvPoint(10,10));

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Thank you, I have missed that cv::getTextSize function :)

Flart ( 2014-02-05 03:32:14 -0600 )edit

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puttext with black background

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