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Optical Engineering

Optimal wordlength calculation for forward and inverse discrete wavelet transform architectures
Author(s): Abdsamad Benkrid; Khaled Benkrid; Danny Crookes
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Paper Abstract

Discrete wavelet transforms (DWTs) have become a very powerful tool in signal processing. The first point to be considered if implemented in hardware is what wordlength to use. We detail a mathematical approach that enables the determination of the exact dynamic range at any filter output of a J-stage 1-D and 2-D forward or inverse DWT for any arbitrary input signal. Once applied on the forward transform, our approach leads to wordlength bit savings compared to the work published in the literature. These savings are relevant when implementing the transform in hardware since they lead to considerable area savings and speed improvement. In addition, we provide the first investigation in determining the exact dynamic range of the inverse transform stages. Although our focus is on the DWTs, the approach can be applied on any finite impulse response (FIR)-filter-based architecture.

Paper Details

Date Published: 1 February 2004
PDF: 9 pages
Opt. Eng. 43(2) doi: 10.1117/1.1637613
Published in: Optical Engineering Volume 43, Issue 2
Show Author Affiliations
Abdsamad Benkrid, Queen's Univ. Belfast (United Kingdom)
Khaled Benkrid, Queens Univ. of Belfast (United Kingdom)
Danny Crookes, Queen's Univ. Belfast (United Kingdom)

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