Optimal block-overlapping synthesis transforms for coding images and video at very low bitrates
- 1 April 1996
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Circuits and Systems for Video Technology
- Vol. 6 (2), 157-167
- https://doi.org/10.1109/76.488823
Abstract
In this paper we address the problem of coding images and video at very low bitrates using conventional hybrid differential pulse code modulation/discrete cosine transform (DPCM/DCT) coding schemes with reduced blocking artifacts. To this end, optimal block-overlapping synthesis filterbanks (block-overlapping inverse transform kernels) with minimum least-squares reconstruction error properties are derived which replace the conventional inverse DCT if only a few DCT coefficients are transmitted to the receiver. Results show that the proposed inverse block-overlapping transforms can significantly outperform the conventional inverse DCT both in terms of objective and subjective quality measuresKeywords
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