time averaged of 5000 images

Question

Shabnam M 2020-9-9

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/590905-time-averaged-of-5000-images

评论： Shabnam M 2020-9-9

Hello,

Actually I have 5000 images which are captured at specific time intervals and they are saved as first_00001, first_00002, first_00003, ...

I want to create a time-averaged image.

I tried to read them by:

======================================================

for k=1:5000
        if k<10
 Image1(:,:,k) = double(imread(['first_0000',num2str(k),'.tif']));
        else if k>9 && k<100
                 Image1(:,:,k) = double(imread(['first_000',num2str(k),'.tif']));
            else if k>99 && k <1000
                  Image1(:,:,k) = double(imread(['first_00',num2str(k),'.tif']));  
                   else if k>999 && k <10000
                  Image1(:,:,k) = double(imread(['first_0',num2str(k),'.tif']));  
                         else if k>9999 && k <100000
                        Image1(:,:,k) = double(imread(['first_',num2str(k),'.tif']));  
                           end
                     end
                end
            end
        end
end 

=====================================================

Now, if I want to create the time averaged image, I should calculate that function on each array and then create a final image.

I will be so gratefull if you can help me to calculate this section.

Thanks in advance

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Shabnam M 2020-9-9

Yes right, but how could I calculate the time-averaged data?

For common averaged data,we can use "mean" but I dont know what should I do for time-averaged one.

Thanks for spending your time

KSSV 2020-9-9

You can pick the indices you want from 3D matrix and use mean right.

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Answer 1

KSSV 2020-9-9

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/590905-time-averaged-of-5000-images#answer_491908

在 MATLAB Online 中打开

imgFile = dir("*.tif") ;  
N = length(imgFiles) ; 
iwant = zeros(m,n,N) ;  % where [m,n] is size of each image. Assuming each image is of size m*n. 
% loop for each image. 
for i = 1:N
    iwant(:,:,i) = imread(imgFiles(i).name) ; 
end

Now you have a 3D matrix. If you want mean of images from 9 to 100; use

M = mean(iwant(:,:,9:100),3) ;

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Shabnam M 2020-9-9

Thanks for your help, but your will give the common mean value (for example it sum the arrays and devide them to their numbers), but I need the time-averaged data.

For instance each images are captured with 100fps which means the difference between each two images is 0.01s.

now I want to get the time-averaged data in the specific perid for 5000 images.

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