Reducing the size of images by a loop

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Joydeb Saha 2021-9-8

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1449029-reducing-the-size-of-images-by-a-loop

评论： Image Analyst 2021-9-8

Here I reduced the size of an image. But I want to reduce the size of all the images of my folder. Images are : abc_20190304_0001 to abc_20190304_0095. How can I make the loop?

I=imread('abc_20190304_0001.png');

imshow abc_20190304_0001.png

L = imresize(I,.25,'bilinear');

figure, imshow(L);

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采纳的回答

KSSV 2021-9-8

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1449029-reducing-the-size-of-images-by-a-loop#answer_783179

在 MATLAB Online 中打开

imgNames = dir('*.png') ;   % give your exntenion of images in the folder 
N = length(imgNames) ;      % toal number of images 
% loop for each image
for i = 1:N
    thisImg = imgNames(i).name ; 
    I=imread(thisImg);
    figure(1)
    imshow(I) ;
    L = imresize(I,.25,'bilinear');    
    figure(2)
    imshow(L);
end

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Joydeb Saha 2021-9-8

Can you just make me understand the last two lines...

consider my path name is : E:\MW\Channel

and I want to save it in the same folder as : abc_20190304_0001, abc_20190304_0002 ....abc_20190304_0095 etc

Image Analyst 2021-9-8

在 MATLAB Online 中打开

You can use sprintf()

baseFileName = sprintf('%4.4d.png', i); % 0001.png for example.
fullOutputFileName = fullfile(outputFolder, baseFileName);
imwrite(L, fullOutputFileName);

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