How to store the pixel information of each images in a folder into separate variables?

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Md Farhad Mokter 2019-5-28

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/464300-how-to-store-the-pixel-information-of-each-images-in-a-folder-into-separate-variables

评论： Md Farhad Mokter 2019-5-28

I have a code that counts black pixels of a given image and stores that in a variable. I want to count and store black pixels from each images of a folder into separate variables.

I = imread('8.JPG');
bw = imbinarize(I);
figure; imshow(bw);
ctr= 0;
for i = 1:224
    for j =1:224 
        if bw(i,j) ==0
            ctr = ctr + 1;
        end 
    end
end

How can I implement this code using loop for all the images in a directoy so thati can have a variable that contains numbers of black pixels of each image?

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Answer 1

Image Analyst 2019-5-28

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/464300-how-to-store-the-pixel-information-of-each-images-in-a-folder-into-separate-variables#answer_376826

在 MATLAB Online 中打开

How about using save()?

I = imread('8.JPG');
bw = imbinarize(I);
numBlackPixels = nnz(~bw);
folder = 'c:/whereverYouWant';
baseFileName = 'MyData.mat';
fullFileName = fullfile(folder, baseFileName);
save(fullFileName, 'numBlackPixels');

No for loop is needed.

Repeat for all your other images.

See the FAQ for code samples to process a sequence of images: The FAQ

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Md Farhad Mokter 2019-5-28

Thank you so much for your quick answer. But I have a large amount of images in the folder and I need to find the ratio of black pixels to other pixels for each image. repeating the process for all images will be hectic Thats why i need variables for each images. I Could not think of other ways. Please let me know if you have better alternatives.

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