How do I use OpenCV MatchTemplate?

Question

I\'m attempting to find an image in another.

im = cv.LoadImage(\'1.png\', cv.CV_LOAD_IMAGE_UNCHANGED)
    tmp = cv.LoadImage(\'e1.png\', cv.CV_LOAD_IMAGE_UN         


        

Answer 1

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! :)