Taking average of pixel values across multiple frames

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Kevin P Meyer 2021-6-17

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https://ww2.mathworks.cn/matlabcentral/answers/858955-taking-average-of-pixel-values-across-multiple-frames

评论： Kevin P Meyer 2021-6-17

I have a 1x3 cell containing image data as a 5504 x 8256 double, each value in the matrix is a pixel grayscale intensity value. Each cell is a picture at a different time or frame. What I want to do is take the average pixel value across each frame. So say I have N number of frames or pictures, I want to average pixel at (row 1, column 1) across those N frames and so on for (row 1, column 2),(row 1, column 3).....and end up with a 5504 x 8256 matrix that has the average pixel value across the number of frames in my cell. Any ideas on how to do this? I was messing around with 3 4x3 double matrices in a 1x3 cell for ease but I was not able to find an efficient way in a for loop to do this for each pixel location.

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Answer 1

Joseph Cheng 2021-6-17

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https://ww2.mathworks.cn/matlabcentral/answers/858955-taking-average-of-pixel-values-across-multiple-frames#answer_727160

编辑：Joseph Cheng 2021-6-17

couldn't you just put it into a non cell matrix of 5504 x8256 x 3 then use mean(data,3) to take the mean in the 3rd dimension? or just add the cell index wise then divide by 3.

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Joseph Cheng 2021-6-17

在 MATLAB Online 中打开

oh that can be accomplished by reshaping the concatenated matrix. see small example below

a = [1 2;3 4];
Acell = {a,a,a};
Acell2mat = cell2mat(Acell)
%looks to concatenate by column 
[arow acol]=size(Acell{1})
Amatstack = reshape(Acell2mat,arow,acol,numel(Acell)); 
MeanA = mean(Amatstack,3)