This file must contain wavelet filter coefficients stored in the file format described below. The standard file extension is .wff (wavelet filter file).
Each .wff file consists of a header part (the H-lines in the table below), and a data part (the D-lines in the table below).
|line number||line name||contents|
|1||H1||Dataplore ® wavelet filter file|
|2||H2||wavelet type: <type>|
|3||H3||size of lowpass analysis: <size-la>|
|4||H4||size of highpass analysis: <size-ha>|
|5||H5||size of lowpass synthesis: <size-ls>|
|6||H6||size of highpass synthesis: <size-hs>|
Line H2 specifies the wavelet type. <type> must be either "orthogonal'' or "biorthogonal''. Lines H3 to H6 contain the number of filter coefficients of the corresponding filter. Lines D1 to D<n> contain the filter coefficients. Each line carries one coefficient. If the wavelet is orthogonal, <type>=orthogonal, lines D1 to D <n> contain the coefficients of the lowpass and highpass filter in that order. Hence <n> is equal to <size-la>+<size-ha>. If the wavelet is biorthogonal, <type>=biorthogonal, lines D1 to D<n> contain the coefficients of the lowpass analysis, highpass analysis, lowpass synthesis and highpass synthesis filters in that order. Hence <n> is equal to <size-la>+ <size-ha>+<size-ls>+<size-hs>. The filters must be normalized so that the sum of the coefficients of the lowpass analysis filter and the sum of the coefficients of the lowpass synthesis filter are .