Hi, I have a matrix 1664 × 128. How to design a filter, the output of the filter is 832×128. That is, it should have first half of 1664(i.e. 832) and should remove other part. I know that I can use: (1:832,:). But I want to design a filter for it.

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Sai Prakash Reddy Konda
评论： Sai Prakash Reddy Konda 2018-10-3
Hi, I have a matrix 1664 × 128. How to design a filter, the output of the filter is 832×128. That is, it should have first half of 1664(i.e. 832) and should remove other part. I know that I can use: (1:832,:). But I want to design a filter for it.

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Image Analyst
Image Analyst 2018-9-8
Not sure what you want. Do you want a filter that returns the matrix unaffected on the top half and the bottom half is all zeros, or cropped off entirely? Or something else?
To zero:
function filteredM = MyFilter(M)
filteredM = M; % Initialize
filteredM(833:end, :) = 0
To crop
function filteredM = MyFilter(M)
filteredM = M(1:832, :);
If that's not what you mean, then explain better.

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Walter Roberson
Walter Roberson 2018-9-8
Filters always return an output the same size as the input, so this is not something that can be done as a true filter.
It can be done as an anonymous function
F = @(M) M(1:floor(end/2),:);
In the case of a matrix with an odd number of rows this does not copy the center row. If you want the center row copied then use ceil instead of floor

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