Writing an emoji on an image using opencv

Question

I would like to know if it is possible to write an emoji on an image with OpenCV.

This is what I have so far.

import cv2
import emoji

img = cv2.imread('image.png')
tick=str(emoji.emojize(':heavy_check_mark:'))
cv2.putText(img, tick,(5,5), cv2.FONT_HERSHEY_TRIPLEX , 1, (255, 255, 255),3)
cv2.imshow('result',img)
cv2.waitKey(0)
cv2.destroyAllWindows()

The above code does not work and I don't know why. Is it possible to load the tick emoji as an image (say img2) and then 'paste' it on some coordinate?

I am using python 3.7.6 on a windows.

you have to use the font that contains emoji characters, not only ASCII — lenik, Apr 04 '20 at 08:07
@lenik I think there are only a handful of fonts with opencv. — Alan Jones, Apr 04 '20 at 08:13

score 1 · Accepted Answer · answered Apr 04 '20 at 09:09

1

You can use PIL/Pillow and a suitable font like this:

#!/usr/local/bin/python3

from PIL import Image, ImageFont, ImageDraw
import numpy as np
import cv2
import emoji

# Open image with OpenCV
im_o = cv2.imread('start.png')

# Make into PIL Image
im_p = Image.fromarray(im_o)

# Get a drawing context
draw = ImageDraw.Draw(im_p)
font = ImageFont.truetype("Arial Unicode.ttf",32)
tick=str(emoji.emojize(':heavy_check_mark:'))
draw.text((40, 80),tick,(255,255,255),font=font)

# Convert back to OpenCV image and save
result_o = np.array(im_p)
cv2.imwrite('result.png', result_o)

Note that Red and Blue channels are interchanged in OpenCV, so either reverse the channel ordering or use blacks, whites and greens. Reverse channel like this:

BGRimage = RGBimage[...,::-1]

answered Apr 04 '20 at 09:09

Mark Setchell

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Thanks @Mark Setchell, where did you find this ImageFont.truetype("Arial Unicode.ttf",32) – Alan Jones Apr 04 '20 at 09:14
1

The "Arial Unicode" font? It's installed on all Macs by default. Else you can download it from the Net. – Mark Setchell Apr 04 '20 at 09:19
Thanks for that. It was really helpful. Stay safe :) – Alan Jones Apr 04 '20 at 09:23
1

Likewise. Good luck with your project and remember, questions (and answers) are free on StackOverflow, so come back and ask another if you get stuck. – Mark Setchell Apr 04 '20 at 09:28

score 0 · Answer 2 · answered Apr 04 '20 at 08:16

0

Please, check this answer Load TrueType Font to OpenCV about loading TTF fonts in OpenCV:

answered Apr 04 '20 at 08:16

lenik

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Writing an emoji on an image using opencv

2 Answers2