How to create a single .mat file from multiple images?

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Le Nguyen 2012-10-5

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https://ww2.mathworks.cn/matlabcentral/answers/49954-how-to-create-a-single-mat-file-from-multiple-images

评论： Shourya 2022-1-19

Hi all,

Assume that I have 5 images as following: 1.bmp, 2.bmp, 3.bmp, 4.bmp, 5.bmp. I want to combine those 5 images into a single .mat file. Anyone knows how to solve this issue, please help me!!

Thanks in advance!!

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naila 2013-8-1

Hi I have the same problem with images: 01.dcm, 02.dcm, 03.dcm ... 22.dcm;

%d isn't working for 01.dcm. what should I do Please

Azzi Abdelmalek 2013-8-1

What is the error message?

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Azzi Abdelmalek 2012-10-5

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https://ww2.mathworks.cn/matlabcentral/answers/49954-how-to-create-a-single-mat-file-from-multiple-images#answer_61007

编辑：Azzi Abdelmalek 2012-10-5

在 MATLAB Online 中打开

for k=1:5
h{k}=imread(sprintf('%d.bmp',k));
end
save file h

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Le Nguyen 2012-10-6

在 MATLAB Online 中打开

Hi all,

After taking a look around Matlab for a while, I seem to know how to solve this issue!! You are right, Matt J!! My bitmap files are all 3D as well as colourful!! That's why Matt Kindig's solution didnt work at all!! Here is my modification and it really works well!!

img = rgb2gray(imread('1.bmp'));

[r,c]= size(img);

h = NaN(r,c,5); %pre-allocate memory

h(:,:,1) = img;

for k=2:5

h(:,:,k) = rgb2gray(imread(sprintf('%d.bmp',k)));

end

save filename h

I am totally a newbie to Matlab, thus, all of your suggestions are always helpful to me and I am really in debt of it!!

Again, thanks a lot!! :)

PS: if there are any modifications for better performance as well as optimization, please let me know!!

Jan 2013-8-1

编辑：Jan 2013-8-1

@Le: Please be careful with the exclamation marks. The have a lot of power in English, e.g. much more than in German.

Your solution looks fine and efficient. Disk access like imread has the benefit, that it is such slow, that improvements in other parts of the code are usually not significant.

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