With the advance in VLSI digital technology, many high throughput and performance imaging and video application had emerged and increased in usage. At the core of these imaging and video applications is the image and video compression technology. Image and video compression processes are by nature very computational and power consuming. Such high power consumption will shorten the operating time of a portable imaging and video device and can also cause overheating. As such, ways of making image and video compression processes inherently low power is needed. The lifting based Discrete Wavelet Transform (DWT) is increasingly used for compression digital image data and is the basis for the JPEG2000 standard (ISO/IEC 15444). Even though the lifting based DWT had aroused considerable implementation of this algorithm, there is no work on the low power realisation of such algorithm. Recent JPEG20O0 DWT implementations are pipelined data-path centric designs and do not consider the issue of power. This thesis therefore sets out to realise a low power JPEG2000 5/3 lifting based DWT hardware architecture and investigates whether optimising at both algorithmic and architectural level will yield a lower power hardware. Besides these, this research also ascertain whether the accumulating Arithmetic Logic Unit (ALU) centric processor architecture is more low power than the feed-through pipelined data-path centric processor architecture. A number of novel implementation schemes of the realisation of a low power JPEG2000 5/3 lifting based DWT hardware are proposed and presented in this thesis. These schemes target to reduce the switched capacitance by reducing the number of computational steps and data-path/arithmetic hardware through the manipulation of the lifting-based 5/3 DWT algorithm, operation scheduling and alteration to the traditional processor architecture. These resulted in a novel SA-ALU centric JPEG2000 5/3 lifting based DWT hardware architecture that saves about 25% of hardware with respect to the two presented existing 5/3 DWT lifting-based architecture.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:662716 |
| Date | January 2004 |
| Creators | Tan, Kay-Chuan Benny |
| Publisher | University of Edinburgh |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Source | http://hdl.handle.net/1842/14517 |
Page generated in 0.0016 seconds