Convert complex double to double type

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ana ain
ana ain on 24 May 2016
Answered: fengwei wang on 9 Oct 2018
I am doing a feature extraction using glcm method. The glcm output are in 'struct' type, while i need the output in double type.
So, I've tried to convert it using several code showed below.
srcFile = dir('D:\1. Thesis FINISH!!!\*.png');
fetrain1 = [];
for b = 1:length(srcFile)
file_name = strcat('D:\1. Thesis FINISH!!!\',srcFile(b).name);
B = imread(file_name);
[gl] = glcm (B);
[gl] = struct2cell (gl);
[gl] = cell2mat (gl);
% [fiturtrain] = structfun(@double, gl, 'uniformoutput', 0);
% [fiturtrain] = double (gl);
[fiturtrain] = cell2mat (gl);
fetrain1 = [fetrain1 fiturtrain];
% vectorname = strcat(file_name,'_array.mat');
save ('fetrain1.mat','fetrain1');
But, the code give me 'complex double' type. I don't know why?
I need to convert fetrain1 from 'complex double' type into 'double' type, so I can use the variable for the next step. Or another way to covert 'struct' exactly to 'double' type.
Any suggestion would be very appreciated. Thank you.
Walter Roberson
Walter Roberson on 18 Sep 2017
Lin Li comments to Megha:
It helps to me. Thanks.

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Answers (2)

Andrew Newell
Andrew Newell on 19 Apr 2017
Judging by the discussion in the Stack Exchange, it seems likely that you can get what you want by replacing most of the code after B = imread(file_name) by the following:
imG = rgb2gray(B);
% create gray-level co-occurrence matrix from image
gimg = graycomatrix(imG);
% extract properties of gray-level co-occurrence matrix
stats = graycoprops(gimg, 'all');
features = [stats.Energy stats.Homogeneity stats.Correlation stats.Contrast];
Then features for multiple images can be assembled into a double-precision matrix, if desired. It's hard to tell what ana ain was trying to do.

fengwei wang
fengwei wang on 9 Oct 2018
Hi,Ana ain. Now I have encountered the same problem as you. Have you solved it yet? If it is solved, can you tell me? Thanks!!


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