Replace ROI with variable texture

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Adrian Szatmari
Adrian Szatmari 2017-8-26
评论： Image Analyst 2017-8-28
Hi! I would like to know whether someone has a better way of doing the following. I have a grayscale image IMG and a certain ROI specified by the (n x 2) index data INDEX, where n is the number of points in the ROI, thus naturally INDEX(i,1) = xi and INDEX(i,2) = yi, i = 1, ..., n. Moreover for each corresponding i-th point, a value is specified in a (n x 1) vector TEXTURE, so that TEXTURE(i) is the value of point (xi, yi). Naturally I want to fill in the IMG with the values in TEXTURE. The following works:
for i = 1:length(INDEX)
x = INDEX(i,1);
y = INDEX(i,2);
IMG(x,y) = TEXTURE(i);
end
Is there a better way of doing this? Maybe without a for loop?
Thanks in advance! Please criticise.

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Image Analyst
Image Analyst 2017-8-26
That way is fine except for one thing: you need to swap x and y because you made the common novice mistake of thinking (x,y) is (row, column). It is NOT. Do this:
IMG(y, x) = TEXTURE(i);
  2 个评论
Adrian Szatmari
Adrian Szatmari 2017-8-27
Thanks for the feedback, I went ahead and fixed the x, y issue. That being said I am doing this texturing millions of times, I thought maybe there was a more native way of doing it.
Image Analyst
Image Analyst 2017-8-28
There probably is, but since I don't have your images, I can't really tell what you want to do. I don't really know what Texture is. For example, do you have a texture image and a gray scale image and you want to replace the gray scale image in some ROI with the texture image? I can't really tell when all you give me is some code that you say does NOT do what you want.

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