Edge-based subband image coding technique for encoding the upper-frequency bands

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Abstract
A subband coding (SBC) scheme, exploiting the dependencies that exist across the bands, is developed which can effectively compress the upper frequency bands of the decomposed image. An edge-detecting filter is incorporated into the SBC model that extracts the edge- pixels in the base-band, and identifies the locations of their counterparts in the upper-bands accordingly without transmission of any overhead information. A memoryless vector quantizing (VQ) scheme was used to encode the base-band. Once the edge-detected reconstructed base-band become available, another VQ coding scheme was employed to encode the upper frequency components across the bands in conjunction with the error derived due to the decoded base-band, only at edge locations. High quality 512 X 512 images were reconstructed at approximately equals 0.7 bits/pixel.© (1991) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

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