How i can extract features from images and save them in one matrix and make groups (label) inside the matrix by matlab?

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Goma Najah 2016-7-22

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/296851-how-i-can-extract-features-from-images-and-save-them-in-one-matrix-and-make-groups-label-inside-th

评论： Goma Najah 2016-7-27

This is works, but i am not sure about my label t_label(1:21,1) is it same rows (From 1 to 21) in the matrix or not,

training_female = 'D:\DBs\jaffe\Train';
filenames = dir(fullfile(training_female, '*.TIFF'));
total_images = numel(filenames);
featureMatrix = [];
for n = 1:total_images
full_name= fullfile(training_female, filenames(n).name);
training_images = imread(full_name);
[featureVector, hogVisualization] = extractHOGFeatures(training_images);
featureMatrix = [featureMatrix; featureVector];
end
xx=imread('YM.SA3.57.TIFF');
[HOG_test, Visualization] = extractHOGFeatures(xx);
t_label = zeros(size(151,1),1); 
t_label(1:21,1) = 1;% Angry;
t_label(22:41,1) = 2; %Disgusted;
t_label(42:63,1) = 3; %Fear;
t_label(64:85,1) = 4; %Happy;
t_label(86:106,1) = 5; %neutral;
t_label(107:128,1) = 6; %Sad;
t_label(129:151,1) = 7; %Surprised;
class=knnclassify(HOG_test,featureMatrix,t_label);

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Image Analyst 2016-7-23

You might need to give people at least one image so they can try to reproduce your situation.

Goma Najah 2016-7-27

Thanks. I solve this by creating matrix for each folder and merge them in a big matrix.

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Answer 1

Image Analyst 2016-7-23

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/296851-how-i-can-extract-features-from-images-and-save-them-in-one-matrix-and-make-groups-label-inside-th#answer_229526

It looks like rows 1-21 should all have the value 1. Do you know how to look in the workspace to check it? Or just put the cursor in the variable and type control-d.

Or you can just type the variable name in the command window.

http://blogs.mathworks.com/videos/2012/07/03/debugging-in-matlab/