How do I extract the coordinates of a colored arrow on an otherwise black and white image?

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Coder Bee
Coder Bee 2016-5-2
评论： Walter Roberson 2016-5-10
I have a black and white image (not grayscale) with a green arrow on it. I need to automatically get the coordinates of this line without using the impixel() function.

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Walter Roberson
Walter Roberson 2016-5-2
mask = YourImage(:,:,2) >= 200 & YourImage(:,:,1) <= 20; %Green presence but not much red, must be green arrow
[r, c] = find(mask);
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Image Analyst
Image Analyst 2016-5-10
Define coordinates. Coordinates of what? The center of the arrow? The tail? The head? Every single green pixel in the arrows? And why??? Why do you care about where some arrow from someone else's image is?
And do you want the coordinates with respect to the large composite image, or to the smaller sub-images? for example, the bottom arrow may be at line 600 with respect the the entire big image, but at line 140 with respect to the small subimage.

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