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

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?

Answer 1

[Pratyush Roy]

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!