Find the location (Y, X) of target image on the screen by taking a screenshot

find.py

import gtk.gdk
import numpy as np
import cv2
import subprocess

w = gtk.gdk.get_default_root_window()
sz = w.get_size()

# Get screen pixels
pb = gtk.gdk.Pixbuf(gtk.gdk.COLORSPACE_RGB, False, 8, sz[0], sz[1])
pb = pb.get_from_drawable(w, w.get_colormap(), 0, 0, 0, 0, sz[0], sz[1])
screen_pixels = pb.get_pixels_array()
# now read in target
target = cv2.imread("sublime2.png")
# find match
result = cv2.matchTemplate(screen_pixels, target, cv2.TM_CCOEFF_NORMED)
coords = np.unravel_index(result.argmax(), result.shape) 
# move mouse to the match coordinates
subprocess.call(['xdotool', 'mousemove', str(coords[1]), str(coords[0])])