How to write text on image using opencv python in run-time application

Question

I'm trying using opencv python codes for my mini project that is Basic paint application.

I want to write a text on my image in run-time application. Not before running the code or hard coded text. How can I do that?

I need help for that, Thanks.

Answer 1

Here is how its done in OpenCV

You can add text to your image using cv2.putText() function For example: cv2.putText(img,'OpenCV',(10,500), font, 4, (255, 255, 255), 2, cv2.LINE_AA)

Check THIS LINK for more details

Here is an example:

import cv2
im = cv2.imread(path + 'pillar.png', 1)
font = cv2.FONT_HERSHEY_SIMPLEX
cv2.putText(im, 'Christmas', (10,450), font, 3, (0, 255, 0), 2, cv2.LINE_AA)
cv2.imwrite(path + 'pillar_text.jpg', im)

UPDATE

I used the chr() function to enter the values of the keys being entered. For every character typed the image would be updated in a while loop. Here is a sample code:

import cv2
path = "C:/Users//Desktop/ocean.jpg"

img = cv2.imread(path)

font = cv2.FONT_HERSHEY_SIMPLEX

i = 10
while(1):
    cv2.imshow('img',img)

    k = cv2.waitKey(33)
    if k==27:    # Esc key to stop
        break
    elif k==-1:  # normally -1 returned,so don't print it
        continue
    else:
        print (k) # else print its value
       cv2.putText(img, chr(k), (i, 50), font, 1, (0, 255, 0), 1, cv2.LINE_AA)
        i+=15

cv2.waitKey(0)
cv2.destroyAllWindows()

Instructions:

1. Press any key to enter its value
2. Press Esc key to end the program