De Vleeschouwer, Christophe
[UCL]
Zakhor, A.
We provide an analytical study of the selection and modulus quantization of matching pursuits (MP) coefficients. We demonstrate that an optimal rate-distortion trade-off is achieved by selecting the atoms up to a dead-zone threshold, and by defining the modulus quantizer in terms of that threshold. In doing so, we take into account quantization error re-injection resulting from inserting the modulus quantizer inside the MP atom computation loop. In-loop quantization affects the stepsize of the uniform quantizer, and results in a non-uniform optimal entropy constrained quantizer. Improvements larger than one dB are obtained for video coding.
Bibliographic reference |
De Vleeschouwer, Christophe ; Zakhor, A.. Atom modulus quantization for matching pursuit video coding.Proceedings of ICIP 2002 International Conference on Image Processing (Rochester, NY, USA, 22-25 September 2002). In: Proceedings of the International Conference on Image Processing, Rochester, NY, USA, IEEE2002 |
Permanent URL |
http://hdl.handle.net/2078.1/68075 |