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Performance Improvement of Vector Quantization with Bitparallelism Hardware

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Author(s): Pi-Chung Wang

Journal: International Journal of Image Processing
ISSN 1985-2304

Volume: 3;
Issue: 4;
Start page: 153;
Date: 2009;
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Keywords: Image Compression | Nearest Neighbor Search | Vector Quantization | Look-up Tables

ABSTRACT
Vector quantization is an elementary technique for image compression; however,searching for the nearest codeword in a codebook is time-consuming. In thiswork, we propose a hardware-based scheme by adopting bit-parallelism to pruneunnecessary codewords. The new scheme uses a “Bit-mapped Look-up Table”to represent the positional information of the codewords. The lookup procedurecan simply refer to the bitmaps to find the candidate codewords. Our simulationresults further confirm the effectiveness of the proposed scheme.
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