threshold images and save as jpeg in loop

Question

udi ibgui 2020-2-13

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/505339-threshold-images-and-save-as-jpeg-in-loop

回答： Subhadeep Koley 2020-2-13

Hi, I would like to run a threshold to approx 50 images of mine and then save the output as jpg, currently im not managing as the saved file says it cannot be read. below is my code

for i = 1:numel(I)
    %Obtain red matrix of image
    filename = fullfile(path, I(i).name);
    im = imread(filename);
    %Extract Red Channel
    b = im(:,:,1);
    
    %Normalising red values
    Norm=double(b(:))./255;
    %Reshaping to fit image shape
    [f,g]=size(b);
    imn=reshape(Norm,[f,g]);
    %threshold image
    thresh = imn .* imn>(0.6258);
    thresh_im =  uint8(thresh);
    
    name = int2str(i);
    save([name, '.jpg'], 'thresh_im')
end

Please help?

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Answer 1

Subhadeep Koley 2020-2-13

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/505339-threshold-images-and-save-as-jpeg-in-loop#answer_415447

在 MATLAB Online 中打开

Use imwrite instead of save.

for i = 1:numel(I)
    % Obtain red matrix of image
    filename = fullfile(path, I(i).name);
    im = imread(filename);
    % Extract Red Channel
    b = im(:, :, 1);
    % Normalising red values
    Norm = double(b(:)) ./ 255;
    % Reshaping to fit image shape
    [f, g] = size(b);
    imn = imresize(Norm, [f, g]);
    % Threshold image
    thresh = imn .* imn>(0.6258);
    thresh_im =  uint8(thresh);
    % Save the image
    imwrite(thresh_im, ['img', num2str(i), '.jpg']);
end