How to insert an image to inside of Circle with OpenCV Python

Python
,
1

I have a circle like this:
circle

and I want to insert an image to inside of this circle. I have checked most of the contents regarding this subject in the internet but I couldn’t find anything.

Do you know how to do this? thank you.

2

Hi
you can use cv.copyTo with a mask

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3

@laurent.berger , “Is there any sample code that would guide me about how to apply such feature in opencv python”?

Because I couldn’t find a solid example that will help me to understand and apply this feature with a sample example, thank you.

4

You can find issue here

and example

import numpy as np
import cv2 as cv

lena = cv.imread('g:/lib/opencv/samples/data/lena.jpg')
mask = np.zeros(shape=(lena.shape[0], lena.shape[1]),dtype=np.uint8)
mask = cv.circle(mask,(250,250),40,255,-1)
dst = cv.copyTo(lena,mask)
cv.imshow("copyTo",dst)
cv.waitKey()

image
image514×544 16.1 KB

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5

so we are not directly insert an external image (like overlay) to the background, but getting that position only.

@laurent.berger friend, what if I want to add an external (2nd image) inside of the circle (something similar to addweight function but with a better way, or what ever way is better and possible) while keeping the background image still, how would we achieve such feature? thank you very much.

6

as already directed, please look at the documentation for cv::Mat::copyTo. you will see that you can use it to copy parts of one image into another as well.

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