How do I use OpenCV MatchTemplate?

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This might work for you! 🙂

def FindSubImage(im1, im2):
    needle = cv2.imread(im1)
    haystack = cv2.imread(im2)

    result = cv2.matchTemplate(needle,haystack,cv2.TM_CCOEFF_NORMED)
    y,x = np.unravel_index(result.argmax(), result.shape)
    return x,y

CCOEFF_NORMED is just one of many comparison methoeds.
See: http://docs.opencv.org/doc/tutorials/imgproc/histograms/template_matching/template_matching.html
for full list.

Not sure if this is the best method, but is fast, and works just fine for me! 🙂

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