MATLAB: High pass filter implement on a image

ideal high pass filter on a image

hello. i want to apply a high pass filter on a image. i m not understanding how apply a ideal high pass filter on image.please any one guide me.

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There may be no ideal filter. Here's one possibility:

kernel = [-1 -1 -1;-1 8 -1;-1 -1 -1];
filteredImage = imfilter(grayImage, kernel, 'same');

You could also do filtering in the Fourier domain if you want.

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MATLAB: How to apply high and low-pass filters to .jpeg images

Have you tried imfilter?

kernel = [-1 -1 -1; -1 8 -1; -1 -1 -1]; % Lapacian high pass.
filteredImage = imfilter(grayImage, kernel);

MATLAB: High pass filter

Your error message does not appear to match your code.

Did you name your file "all.m" ? If so then that would interfere with the internal use of the MATLAB function named "all"

The documentation for butter indicates that the first output argument (your highPassFilter) will be a column vector of the length indicated by your first input argument (here N, value 2). It is not the filter itself, and it is not a function: it is part of the coefficients needed to construct a filter. Accessing it at (512,512) is never going to work because it will be a column vector.

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MATLAB: How to apply high and low-pass filters to .jpeg images

MATLAB: High pass filter

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