Matlab source code for Image compression algorithm

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Rishav 2014-3-16

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https://ww2.mathworks.cn/matlabcentral/answers/121768-matlab-source-code-for-image-compression-algorithm

编辑： DGM 2024-4-8

I need a source code for image compression algorithm that will read the image and then compress it and save it in another folder. There is no need to display the image while executing. It would be more helpful if the source code works on multiple files through a loop. p.s i am working in matlab 2010a

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Image Analyst 2014-3-16

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originalImage = imread(inputfilename);
[inputFolder, baseFileName, ext] = fileparts(inputfilename);
% Write as compressed JPG or PNG or whatever.
outputFileName = fullfile(outputFolder, [baseFileName, '.jpg']);
imwrite(originalImage, outputFileName);

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doaa 2022-11-6

if you be exist to the code ,can you sent to me because i need it and doesn't reach for any code

Walter Roberson 2022-11-6

doaa, we have been discussing multiple programs, and we do not know which one you want.

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Sufyan Parkar 2019-9-26

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编辑：DGM 2024-4-8

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Well Steven Lord,

I have tried to write a code myself.

Please try to assist me here.

clc;
clear all;
close all;
a = imread("location");
ag = rgb2gray(a);
imshow(a)
z = zeros(size(ag));
[x y] = size(ag);
for i = 1:x
    z(i,1) = ag(i,1);
    for j = 2:y
        z(i,j) = ag(i,j-1) - ag(i,j);
    end
end
disp(z)
figure()
imshow(z)

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Walter Roberson 2019-9-26

That code does no image compression. It tries to find the difference between adjacent pixels, perhaps in preparation for delta encoding. However, you will find that ag is likely uint8 and when you subtract a larger uint8 from a smaller you get 0 rather than negative. If you were to take care to double(ag) then you could get negative. However you are storing the results in double() and imshow of double with negative values might not give you the results you expect. Does it make sense to display the difference between adjacent pixels as if it were itself an image?

By the way: read about diff()

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khadija elazrag 2019-10-27

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https://ww2.mathworks.cn/matlabcentral/answers/121768-matlab-source-code-for-image-compression-algorithm#answer_398427

Hi i need source code for DNA comprission by using huffman algorithm

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khadija elazrag 2019-10-28

thanks a lot i have question. how i can enter my inputs like probability and symbole from datasets

and how can i apply this code on DNA from datasets, is it manoualy or there is command to do that, my problem is how i can find and enter datasets for huffman code.