Appeal No. 2001-0867
Application 09/016,571
according to that symbol’s predicted rate-distortion slope.
Representative claim 1 is reproduced as follows:
1. A rate-distortion optimization method for embedded
coding of a digital image, comprising the steps of:
transforming the image to form a set of coefficients;
quantizing the coefficients to form a set of symbols;
calculating, for each symbol, a predicated rate-distortion
slope based on an expected distortion decrease and an expected
coding rate increase for that symbol;
selecting an encoding order for the symbols by ordering each
symbol according to that symbol’s calculated predicated rate-
distortion slope, such that symbols with a steeper predicated
rate distortion slope, and therefore larger predicted distortion
decrease, are encoded before symbols with a less steep predicted
rate distortion slope.
The examiner relies on the following references:
Copperi et al. (Copperi) 4,811,398 Mar. 07, 1989
Pennebaker et al. (Pennebaker) 5,099,440 Mar. 24, 1992
Schuster et al. (Schuster) 5,778,192 July 07, 1998
(filed Oct. 26, 1995)
K. Ramchandran et al. (Ramchandran), “Bit Allocation for
Dependent Quantization with Applications to Multiresolution and
MPEG Video Coders,” IEEE Transactions On Image Processing, Vol.
3, No. 5, September 1994, pages 533-545.
J. Li et al. (Li), “On the Improvements of Embedded Zerotree
Wavelet (EZW) Coding,” SPIE, Vol. 2501, May 24, 1995, pages 1490-
1501.
The admitted prior art described in Appellants’ specification.
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