Variable block rate and blockwise spectral adaptation in cosine transform image coding
- 6 January 2003
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE)
Abstract
A block discrete-cosine transform coding scheme is implemented with a different rate assignment to each block for the purpose of maintaining a constant distortion per block. A spectral estimate is calculated for every block. Overhead rate and computation for adaptation are kept to a reasonable level through characterization of the block's estimated spectrum by a one-dimensional autoregressive model. Simulations with natural and multimodality medical images provide reconstructions with nearly uniform block distortion and very high visual and measurable quality at low rates.Keywords
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