CODEWITHSUNDEEP
c++imageopencvtext
Jacob M.
Jacob M.

Reputation: 95

Display an image with OpenCV and input text over specific spots in C++

I'm looking to label specific x,y coordinates in my image with letter values. I saw that OpenCV has a "putText" function, but that only allows me to overlay text on one of the corners of the image. I have x,y coordinates where I'd like to overlay the text.

Is there any way to do this through OpenCV and if not, how might I do this?

Edit: clarification that I'm trying to do this in C++.

Upvotes: 3

Views: 3110

Answers (2)

kebs
kebs

Reputation: 6707

cv::Point pt(x,y); // pixel coordinates
cv::putText( img, my_string, pt, cv::FONT_HERSHEY_PLAIN, 2.0, cv::Scalar(blue,green,red);

The 5th argument is a scale value, adjust on your needs The color values are in the range (0-255), for a CV_8UC3 image.

You have additional fonts here.

These are the only requested arguments but you have more if needed, see here.

Upvotes: 1

Arijit
Arijit

Reputation: 1516

font = cv2.FONT_HERSHEY_SIMPLEX
cv2.putText(img,'OpenCV',(x,y), font, 4,(255,255,255),2,cv2.LINE_AA)

where font is the font and (x,y) is the coordinate of the text

C++: void putText(InputOutputArray img, const String& text, Point org, int fontFace, double fontScale, Scalar color, int thickness=1, int lineType=LINE_8, bool bottomLeftOrigin=false )

Pass org the point cordinates of the text

Upvotes: 0

Related Questions