how to find a sub image in an image and converting it to grayscale?

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Kratos
Kratos 2015-4-9
回答： Image Analyst 2015-4-9
Hello,
I have an image and a sub image which is cropped out of the image.
(img, img_w)
val1 = imread(img);
val2 = imread(img_w);
gray1 = rgb2gray(val1);%grayscaling both images
gray2 = rgb2gray(val2);
matchingval = normxcorr2(gray1,gray2);%normalized cross correlation
[max_c,imax]=max(abs(matchingval (:)));
After this I am stuck. I have no Idea how to change the whole image grayscale except for the sub image which should be in color.
How do I do this?
Thank you.

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回答（1 个）

Image Analyst
Image Analyst 2015-4-9
This is exactly what I do in my attached demo, except that it's in color. Your situation might be a little simpler.

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