This paper presents a shapeadaptive discrete wavelet transform (SA-DWT) scheme for coding arbitrarily shaped texture. The proposed SA-DWT can be used for object-oriented image coding. The number of coefficients after...
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ISBN:
(纸本)0819424358
This paper presents a shapeadaptive discrete wavelet transform (SA-DWT) scheme for coding arbitrarily shaped texture. The proposed SA-DWT can be used for object-oriented image coding. The number of coefficients after SA-DWT is identical to the number of pels contained in the arbitrarily shaped image objects. The locality property of wavelet transform and self-similarity among subbands are well preserved throughout this process. For a rectangular region, the SA-DWT is identical to a standard wavelet transform. With SA-DWT1 conventional wavelet based coding schemes can be readily extended to the coding of arbitrarily shaped objects. The proposed shapeadaptivewavelet transform is not unitary but the small energy increase is restricted at the boundary of objects in subbands. Two approaches of using the SA-DWT algorithm for object-oriented image and video coding are presented. One is to combine scalar SA-DWT with Embedded Zerotree wavelet (EZW) coding technique (called SA-EZW), the other is an extension of the normal vectorwaveletcoding (VWC) technique (called SA-VWC) to arbitrarily shaped objects. Results of applying SA-VWC to real arbitrarily shaped texture coding are also given at the end of this paper.
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