Function OPTIMIZE_FILTER

Package

Short description

Usage

    filter = OPTIMIZE_FILTER(filter_f, lowpass, options)

Input

    filter_f (numeric): The Fourier transform of the filter.
    lowpass (boolean): If true, filter_f contains a lowpass filter.
    options (struct): Various options on how to optimize the filter:
       options.filter_format (char): Specifies the type of optimization, 
          either 'fourier', 'fourier_multires' or 'fourier_truncated'. See 
          description for more details.
       options.truncate_threshold (numeric): If options.filter_format is 
          'fourier_truncated', this indicates the threshold to be passed on 
          to TRUNCATE_FILTER. See the documentation of this function for more
          details.

Output

    filter (struct or numeric): The optimized filter structure.

Description

    Depending on the value of options.filter_format, OPTIMIZE_FILTER calls
    different functions to optimize the filter representation. If 'fourier',
    the function retains the Fourier representation of the filter. If 
    'fourier_multires', the filter is periodized and stored at all resolu-
    tions using PERIODIZE_FILTER. Finally, if it equals 'fourier_truncated',
    TRUNCATE_FILTER is called on filter_f.

See also

• periodize_filter
• truncate_filter