PMG FILE AND INTENSITY VALUES

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Aybüke Ceren Duran 2019-4-23

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https://ww2.mathworks.cn/matlabcentral/answers/458056-pmg-file-and-intensity-values

评论： Walter Roberson 2019-4-24

format compact
%Firstly, I converted all the images in the vector form.
whereImagesReside = 'lfwdataset';
%dir function will return the images in a structure array.
listOfImages= dir(fullfile(whereImagesReside, '*.pgm'));
%0x1 structure array is created
data = cell(size(listOfImages));
%pmg files are in 0x1 structure array.
for k=1:numel(listOfImages)
      data{k}=imread(fullfile(whereImagesReside, listOfImages(k).name));
      col(:,k)=data(:);
      V{k}=data(:);
end

How can I get the pixel intesity of each pmg image?

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Answer 1

Walter Roberson 2019-4-23

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https://ww2.mathworks.cn/matlabcentral/answers/458056-pmg-file-and-intensity-values#answer_371917

It is not clear whether your images are RGB or not. If they are RGB then

intensity = cellfun(@rgb2gray, data, 'uniform', 0);

and then intensity would be a cell array in which each element is a pixel intensity array.

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Aybüke Ceren Duran 2019-4-24

it is not RGB. So how can I get if it is not RGB?

Walter Roberson 2019-4-24

Ah, looking further I see that PGM is Portable Gray Map. So every value you read in is already intensity. Your col variable will have all of the intensities stored in it.

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