My ICIP 2006 Schedule
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|Time:||Monday, October 9, 14:20 - 17:00
|| Image & Video Communications: Source/channel coding|
|| LOW RATE UNIFORM SCALAR QUANTIZATION OF MEMORYLESS GAUSSIAN SOURCES|
||Vadim Sheinin; IBM T. J. Watson Research Center|| |
| ||Ashish Jagmohan; IBM T. J. Watson Research Center|| |
|| The low-rate (< 1 bits per sample) operational rate-distortion performance of uniform scalar quantizers for the memoryless Gaussian source is studied. Approximate analytical expressions for the operational rate-distortion function are derived, and the accuracy of the derived function is verified through simulation. It is shown that in the zero-rate limit the derived operational rate-distortion function is first-order optimal with respect to the Shannon lower bound. The derived function is used to study the performance of uniform scalar quantizers for the Gaussian Wyner-Ziv problem. Lastly, the derived low-rate rate-distortion function is used to provide improved low-rate bit allocation for jointly Gaussian vectors.|