OpenCV Template Matching: Restrict search area

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Asked 19/12, 2013 at 13:59 Answered 19/12, 2013 at 14:3

Solved python opencv image-processing computer-vision template-matching

I have working OpenCV template matching code made with python. Now I am searching for a way to tell OpenCV to search only in a supplied area (x, y, w, h), is that possible?

Regards, Philip

Fungistat answered 19/12, 2013 at 13:59 Comment(0)

roi = image[y:y+h , x:x+w]

cv2.matchTemplate(roi, templ, ...

Ingunna answered 19/12, 2013 at 14:3 Comment(7)

So technically I just create a new image out of the original and then search in it? – Fungistat 19/12, 2013 at 14:16

it's just a subrect of the original image ( so, not a copy, if you were asking this ) – Ingunna 19/12, 2013 at 14:24

Problem is I get a NameError: global name 'y' is not defined – Fungistat 19/12, 2013 at 14:38

hey, ofc. you've got to replace x,y,w,h with your numbers there – Ingunna 19/12, 2013 at 14:41

I don't get it. So I if I have a image called template that is made with cv2.imread() I just do roi = template[10,10,10,10] and then I have a 10x10 sized chunk starting at coordinates X:10 and Y:10? – Fungistat 19/12, 2013 at 14:45

make it: template[10:20, 10:20] then – Ingunna 19/12, 2013 at 14:47

Please, complete your answer with a full formula and ideally a working example. – Lucullus 8/3, 2017 at 14:52

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