Applying Movmedian Within Cell Array

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itend 2017-8-24

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评论： itend 2017-8-25

采纳的回答： Jan

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Hello,

I have a cell array (2 x 6) called "output", each cell in row #1 {1 -> 6, 2} contains a 1024 x 1024 x 100 matrix. I want to apply movmedian to each cells in row #1. I would like to apply this function in dimension = 3 with window size = 5.

output = cellfun(@movmedian(5,3), output,'uniform', 0);

This is the code that I have come up with so far, however, it produces an "unbalenced or unexpected parenthesis or bracket" error. I am unsure what is causing this error. I am also somewhat unsure how to instruct matlab to perform this operation only on row 1 of the cell array, please help!

Thank you for your time!!

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Image Analyst 2017-8-24

You say C is an array of cells with 2 rows of 6 columns ("2x6").

C(:,1) is a column vector of the 2 cells in column #

C(1,:) is a row vector of the 6 cells in row #1.

C(expression, 2) is a column vector extracted from only the rows identified in "expression" and only from column #2. So it would have either one cell or two cells since there are only two rows.

Not sure what you mean, but it's clear that reading this FAQ item might help: http://matlab.wikia.com/wiki/FAQ#What_is_a_cell_array.3F

itend 2017-8-25

Thank you for your response.

I was interested in C(1,:), the row vector of 6 cells in row 1.

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采纳的回答

Jan 2017-8-24

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https://ww2.mathworks.cn/matlabcentral/answers/353970-applying-movmedian-within-cell-array#answer_279149

编辑：Jan 2017-8-24

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output(:, 1) = cellfun(@(c) movmedian(c, 5, 3), output(:, 1), 'uniform', 0);

Remember, that cellfun is very nice, but less efficient than a simply loop in general. Try this:

for k = 1:size(output, 1)
  output{k, 1} = movmedian(output{k, 1}, 5, 3);
end

I prefer to keep it simple stupid, most of all if it takes less runtime in addition.

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Image Analyst 2017-8-24

Two questions:

Why are you using a cell array to store all the frames? I see no need for that.
Why aren't you using medfilt2() to do a median filter on your images?

itend 2017-8-25

1) The idea is that I use a cell array to store each image, then perform operations such as background subtraction to all entries within the cell array. How would you recommend storing/processing the images?

2) I actually figured out how to modify the parameters of movmedian to solve the issue I was having.

Thanks!

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