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Error , find entropy of 3d volumetric image on GLCM features ?

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Hla Hla
Hla Hla 2022-8-25
评论： Walter Roberson 2022-8-28
I will find GLCM feature. But error follow as:
b=niftiread("D:\DATASET\Task01_BrainTumour\imagesTr\BRATS_001.nii");
b1=b(:,:,:,1);
cmap = copper(256);
recolored_image = rgb2gray(b1, cmap);
error as following;
Error using rgb2gray
Too many input arguments.

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回答（2 个）

Walter Roberson
Walter Roberson 2022-8-25
rgb2gray() has never supported more than one input, and has never supported recoloring images.
rgb2ind supports passing in a colormap. You could recolor an image by using
ind = rgb2ind(b1, cmap);
recolored_image = ind2rgb(ind, cmap);
Abderrahim. B
Abderrahim. B 2022-8-25
Hi!
b1 is not truecolor image that is a m-by-n-by-3 numeric array. b1 in your case is a m by n by l by 1 (4 D array). use reshape to deal with this.
Hope this helps
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Hla Hla
Hla Hla 2022-8-25
编辑：Walter Roberson 2022-8-28
Dear sayar, i run above the code.
ind = rgb2ind(b1, cmap);
recolored_image = ind2rgb(ind, cmap);
Error occupy followas:
Error using rgb2ind>parse_inputs (line 145)
RGB image has to be M-by-N-by-3 array.
Error in rgb2ind (line 53)
[RGB,m,dith] = parse_inputs(varargin{:});

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