what does this line means in the following code? I=I(200:400,250:450,:); and when i change the ratio there comes an error of "index exceeds matrix dimensions"
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Andrew Newell on 18 Apr 2017
Edited: Andrew Newell on 19 Apr 2017
The function imread retrieves a 3D array consisting of 2D images in various colors or grayscale. The number of these images depends on the size of the third dimension (see Multidimensional arrays). They may, for example, be the red, green and blue components of the total color. The command I=I(200:400,250:450,:) is taking a rectangular sample out of each of these images. As for how regcovsmooth deals with it, this is software from GitHub that I'm not familiar with.
More Answers (2)
msahar on 18 Apr 2017
Edited: msahar on 19 Apr 2017
I am assuming that you are particularly asking about regcovsmooth function. This function is used for preserving image smoothing via region covariances. The output S is the structure component extracted from input image I.
Please read the research paper at the link given below,
Image Analyst on 18 Apr 2017
It probably wants a gray scale image, not a color image. At least that's what I'd try to get rid of the error message.
I = rgb2gray(I);
S = regcovsmooth(I,10,4,0.2,'M1');
By the way, please pick a more descriptive variable name than I. It looks too must like 1 (one) and l (lower case L).