Find location of a symbol on an image with python

Question

I am trying to locate a specific symbol on my image. For instance take this as an example: Screenshot , How would I locate the location of the heart symbol (like button)? Location as in pixels, where the origin of the coordinate system is at the bottom left corner. I would like to to di by using python. Thanks a lot!

PS: the like symbol could change location for any screenshot

Answer 1

If it's a simple constant-size and well defined image, as it seems to be, you could use template matching .

In python there's an excellent Scikit Image module .

In brief:

from skimage.io import imread
from skimage.feature import match_template
from skimage.color import rgb2gray

image = imread('big_image.jpg')
template = imread('template.jpg')

image_gray = rgb2gray(image)
template_gray = rgb2gray(template)

result = match_template(image_gray, template_gray)
ij = np.unravel_index(np.argmax(result), result.shape)
x, y = ij[::-1]