How to save image from dataset in MATLAB

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Med Future
Med Future on 11 Apr 2022
Answered: yanqi liu on 19 Apr 2022
Hello everyone, I hope you are doing well.
with reference to my previous question :
In previous question i have the dataset of shape 3000x1000 and each row has value from 1 to 1000
and each class has 1000 samples in each row
so the code create the image of each row 1000x1000 and save in the folder
Now i have the dataset of shape 100x1000. but now i have in each row has value from 1 to 10000.
The only different is that my values in each rows change from 1 to 10000
When i try to save the image it gives blank image How can i save the value as image
%% create grayscale shapes that resemble the data
[numImages, lenImage] = size(Dataset1000);
imSz = 1000; % assuming images are 1000x1000
imbg = false(imSz); % background "color"
imfg = ~imbg(1,1); % forground "color"
imSizeOut=[1000 1000]; % resize to 224 by 224
for imNum = 1:numImages
imData = Dataset1000(imNum,:); % get pattern
[~,Y] = meshgrid(1:imSz); % make a grid
% black and white image
BW = imbg;
BW(Y==imData)=imfg;
% resize (from 1000x1000 to 224x224)
BW=imbinarize(imresize(double(BW),imSizeOut));
% convert to uint8 (0 255)
im = im2uint8(BW);
% flip
im = flipud(im);
folderName = 'C/user/images';
im_FullFilename = fullfile(folderName,sprintf('im_%06g.png',imNum));
imwrite(im,im_FullFilename);
end

Answers (1)

yanqi liu
yanqi liu on 19 Apr 2022
load matlab1.mat
%% create grayscale shapes that resemble the data
[numImages, lenImage] = size(Dataset1000);
Dataset1000 = round(mat2gray(Dataset1000)*1000);
imSz = 1000; % assuming images are 1000x1000
imbg = false(imSz); % background "color"
imfg = ~imbg(1,1); % forground "color"
imSizeOut=[1000 1000]; % resize to 224 by 224
for imNum = 10
imData = Dataset1000(imNum,:); % get pattern
[~,Y] = meshgrid(1:imSz); % make a grid
% black and white image
BW = imbg;
BW(Y==imData)=imfg;
% resize (from 1000x1000 to 224x224)
BW=imbinarize(imresize(double(BW),imSizeOut));
% convert to uint8 (0 255)
im = im2uint8(BW);
% flip
im = flipud(im);
folderName = 'C/user/images';
im_FullFilename = fullfile(folderName,sprintf('im_%06g.png',imNum));
imwrite(im,im_FullFilename);
end

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