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Call alpha-trimmed mean filter implementation Memcpy(extension + 2, signal, N * sizeof( element)) Įxtension = signal
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Check memory allocation if (!extension) Allocate memory for signal extension element* extension = new element
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If (!signal || N < 1 || alpha < 0 || 4 < alpha || alpha & 1) alpha - filter alpha parameter void alphatrimmedmeanfilter( element* signal, element* result, int N, int alpha) Get result - the mean value of the elements in trimmed set Put found minimum element in its place const element temp = window Find position of minimum element int min = j Order elements (only necessary part of them) for ( int j = 0 j < end ++j) Pick up window elements element window Move window through all elements of the signal for ( int i = 2 i < N - 2 ++i) End of the trimmed ordered set const int end = 5 - (alpha > 1) Start of the trimmed ordered set const int start = alpha > 1 alpha - filter alpha parameter void _alphatrimmedmeanfilter( const element* signal, element* result, 1D ALPHA-TRIMMED MEAN FILTER implementation We do that by changing index of the leading element: Let us have 1D signal of length N as input. In this section we develop 1D alpha-trimmed mean filter with window of size 5.
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Now, when we have the algorithm, it is time to write some code - let us come down to programming. Maximum value for alpha is filter window size minus one and in this case Minimum value for alpha parameter is zero and in this case alpha-trimmed mean filterĭegenerates into mean filter. Since our filter is symmetric one alpha is an even nonnegative number less than size of the filter window. In practice alpha is the number of elements to be discarded, for instance, in our case alpha is two.
HOW TO WRITE C CODE FOR IMAGE FILTERS HOW TO
Now let us see, how to get alpha-trimmed mean value in practice. “ Filter window, or filter mask” article. To get acquainted with filter window idea in signal and image processing read our Alpha you can see in the name of the filter is indeed parameter responsible for the number of The basic idea behind filter is for any element of the signal (image) look at its neighborhood,ĭiscard the most atypical elements and calculate mean value using the rest of them. Introduction to alpha-trimmed mean filterĪlpha-trimmed mean filter is windowed filter of nonlinear class, by its nature is hybrid of the
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