Matlab CERR Gray Level Run Length Matrix

When I run the code in github to obtain the GLRLM in CERR, Matlab doesn't end running and no errors appear in the command window. So I have no clue what's wrong.

https://github.com/cerr/CERR/wiki/GLRLM_global_features

Here is the function I wrote based on the code in the github wiki above.

function out = run_length_matrix
global planC;
% Define the scan index
scanNum = 1;
indexS = planC{end};
scan3M = getScanArray(planC{indexS.scan}(scanNum));
numGrLevels = 64;
minIntensity = -400;
maxIntensity = 500;
%binWidth = 25;
quantizedM = imquantize_cerr(scan3M,numGrLevels,minIntensity,maxIntensity);
numVoxels = sum(~isnan(quantizedM(:)));
dirFlag = 1; % 1: 3-d, 2: 2-d
offsetsM = getOffsets(dirFlag);
rlmType= 1; % 1: combine, 2: separate GLCMs
rlmM = calcRLM(quantizedM, offsetsM, numGrLevels, rlmType);
rlmFeatC = {'sre',    'lre',    'gln',    'glnNorm',    'rln',    'rlnNorm',    'rp',    'lglre',...
    'hglre',    'srlgle',    'srhgle',    'lrlgle',    'lrhgle',    'glv',    'rlv', 're'};
rlmFlagS = cell2struct(num2cell(ones(size(rlmFeatC))),rlmFeatC,2);
featureS = rlmToScalarFeatures(rlmM, numVoxels, rlmFlagS);
out = featureS;
end

Answer 1

[Ayush Modi]

Hi Laura,

As per my understanding, you are not able to see any error and MATLAB is running indefinitely. As “planC” is a global variable, I am not able to reproduce the issue at my end.

You can refer the suggested solution in the community to obtain the GLRLM. Please refer the following for the same:

https://www.mathworks.com/matlabcentral/fileexchange/17482-gray-level-run-length-matrix-toolbox

After opening the link, go to the functions tab at the top of the page. You can refer the file named – “grayrlmatrix.m”.

I hope this resolves the issue you were facing.