extracting HOG features from .mat files and usage of "fitcecoc"

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santhosh kumar buddepu
回答： Pratyush Roy 2021-11-2
I have '.mat files' for different objects and I want to extract HOG features from the mat files, and I want to apply those features on "fitcecoc" SVM one vs one classifier. I have written a code but giving the error like this:
CS=[16,16];
traindb='D:\matprog\matfiles\trainfiles';
filePattern=fullfile(traindb, '*.mat');
matFiles = dir(filePattern);
for i = 1:length(matFiles)
baseFileName = fullfile(traindb, matFiles(i).name);
ref_files{i} = load(baseFileName);
trainingfeatures(i,:)=extractHogfeatures(ref_files,'cellsize',CS);
end
traininglabels=traindb.Labels;
classifier=fitcecoc(trainingfeatures,traininglabels);
ERROR:
Dot indexing is not supported for variables of this type.
how to give labels and is it correct way to follow?

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采纳的回答

Pratyush Roy
Pratyush Roy 2021-11-2
Hi Santhosh,
The traindb variable in the code refers to a string and not a struct. Hence the dot indexing does not work in this case.
As a workaround, you can use Image DataStore to store the image data, since it supports dot indexing.
Hope this helps!

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