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Optimal block-overlapping synthesis transforms for coding images and video at very low bitrates

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2 Author(s)
Sikora, T. ; Dept. of Digital Image Process., Heinrich-Hertz-Inst. for Commun. Technol., Berlin, Germany ; Hui Li

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 measures

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Circuits and Systems for Video Technology, IEEE Transactions on  (Volume:6 ,  Issue: 2 )