A novel approach for time–frequency localization of scaling functions and design of three-band biorthogonal linear phase wavelet filter banks

2017 ◽  
Vol 69 ◽  
pp. 309-322 ◽  
Author(s):  
Dinesh Bhati ◽  
Ram Bilas Pachori ◽  
Vikram M. Gadre
Keyword(s):  
Filter Banks ◽  
Scaling Functions ◽  
Wavelet Filter ◽  
Linear Phase ◽  
Time Frequency ◽  
Novel Approach ◽  
Time Frequency Localization

Design and FPGA implementation of 11th order Efficient IIR Wavelet Filter Banks with Approximate Linear-phase

2018 ◽  
Vol 7 (4) ◽  
pp. 207
Author(s):  
Rasha W. Hamad
Keyword(s):  
Filter Bank ◽  
Digital Filters ◽  
Filter Banks ◽  
Pass Band ◽  
Wavelet Filter ◽  
Linear Phase ◽  
Wavelet Filter Bank ◽  
Lattice Wave ◽  
Wave Digital Filters ◽  
Matlab Programming

In this paper. Bireciprocal Lattice Wave Digital Filters (BLWDFs) are utilized in an  approximate linear-phase in pass-band design of  order IIR wavelet filter banks (FBs). These filter banks are efficiently designed by replacement one of  branches for (BLWDFs)  by only a unit delay. The coefficients of the designed filter are achieved by simulating the IIR response suggested in [1]. The design is  first simulated using Matlab programming in order to investigate the resulting wavelet filter properties and to find the suitable wordlength for the BLWDFs coefficients. FPGA implemtation of the proposed IIR wavelet filter bank is also achived for three levels with less complexity and high operating frequency.

Phase Watermarking of Images with Complex-Valued Linear-Phase Subband Filter Banks

2013 ◽  
Vol 339 ◽  
pp. 275-280
Author(s):  
Li Chen ◽  
Rong Hua Peng
Keyword(s):  
Frequency Band ◽  
Filter Banks ◽  
Low Frequency ◽  
Linear Phase ◽  
Time Frequency ◽  
Frequency Spread ◽  
Phase Filter ◽  
Dct Domain ◽  
Dct Coefficients ◽  
Complex Valued

A new algorithm is proposed for digital watermarking by applying complex-valued linear-phase filter banks to low frequency-band coefficients of images in the DCT domain. The watermark is conveyed in the phase spectrum of the subband coefficients. The robustness of the algorithm is examined in JPEG encoding with different qualities and compared with the DFT-based approach. Because only low frequency-band DCT coefficients are applied to complex-valued filter banks, the computational load introduced by the complex-valued filter banks is kept low. The watermark decoding is only accessible to users with the key information, i.e., impulse responses of the complex-valued linear-phase filter banks that designed with time-frequency spread property.

Sign in / Sign up

Export Citation Format

Share Document