如何在opencv-python中将文本打印到框架

Question

I am using opencv-python for my face detection experiment. I am also to do a cv.drawRect function. I tried with cv.putText but it is not supported in python. Is there other functions other than cv.putText which can write text to an image frame

Answer 1

Got it. In the older version of python-opencv use PutText instead of putText

font = cv.InitFont(cv.CV_FONT_HERSHEY_SIMPLEX, 1, 1, 0, 3, 8) #Creates a font
x = 10 #position of text
y = 20 #position of text
cv.PutText(image,"Hello World!!!", (x,y),font, 255) #Draw the text

Answer 2

In case someone is interested to the new version of opencv-python:

import cv2

font = cv2.FONT_HERSHEY_DUPLEX
color = (255, 0, 0) # red
fontsize = 255
text = "test"
position = (10, 10)

cv2.putText(image, text, position, font, fontsize, color=color)

The available default fonts are defined in modules/imgproc/include/opencv2/imgproc.hpp header file:

enum HersheyFonts {
    FONT_HERSHEY_SIMPLEX        = 0, //!< normal size sans-serif font
    FONT_HERSHEY_PLAIN          = 1, //!< small size sans-serif font
    FONT_HERSHEY_DUPLEX         = 2, //!< normal size sans-serif font (more complex than FONT_HERSHEY_SIMPLEX)
    FONT_HERSHEY_COMPLEX        = 3, //!< normal size serif font
    FONT_HERSHEY_TRIPLEX        = 4, //!< normal size serif font (more complex than FONT_HERSHEY_COMPLEX)
    FONT_HERSHEY_COMPLEX_SMALL  = 5, //!< smaller version of FONT_HERSHEY_COMPLEX
    FONT_HERSHEY_SCRIPT_SIMPLEX = 6, //!< hand-writing style font
    FONT_HERSHEY_SCRIPT_COMPLEX = 7, //!< more complex variant of FONT_HERSHEY_SCRIPT_SIMPLEX
    FONT_ITALIC                 = 16 //!< flag for italic font
};

(Image source: Code Yarns )