| Paper: | SPCOM-P3.9 | ||
| Session: | Joint Source/Channel Coding and Quantization | ||
| Time: | Wednesday, May 19, 09:30 - 11:30 | ||
| Presentation: | Poster | ||
| Topic: | Signal Processing for Communications: Joint Source-Channel Coding | ||
| Title: | OPTIMAL ERROR PROTECTION FOR REAL TIME IMAGE AND VIDEO TRANSMISSION | ||
| Authors: | Masoud Farshchian; Rensselaer Polytechnic Institute | ||
| Sungdae Cho; Rensselaer Polytechnic Institute | |||
| William A. Pearlman; Rensselaer Polytechnic Institute | |||
| Abstract: | In this paper a novel and computationally inexpensive analytic mean square error (MSE) distortion rate (D-R) estimator for SPIHT which generates a nearly exact distortion rate (D-R) function for 2-D and 3-D SPIHT algorithm is presented. The analytical formula is derived from the observations that for any bitplane coder, the slope of the D-R curve is constant for each level of the bit plane. Furthermore the slope of D-R curve reduces by a factor proportional to the level of the bitplane. An application of the derived results is presented in the area of 2-D SPIHT transmission employing a binary symmetric channel (BSC) and Reed Solomon (RS) forward error correction (FEC) codes. Utilizing our D-R estimate, we employ unequal error protection (UEP) and equal error protection (EEP) in order to minimize the end to end mean square error (MSE) distortion of the transform domain. UEP yields a significant performance gainrelative to EEP only when the average number of parity bits for a group of packets is constrained. When both the source rate and channel code rate varied under a bit budget constraint, optimal UEP yields only a slight improvement over the optimal EEP. A major contribution of this paper is the simple and extremely accurate analytical D-R model which potentially improves upon pre-existing methodologies and applications that rely on an accurate and computationaly inexpensive D-R estimate. Another important contribution is that the optimum EEP, which requires almost no header information and can easily be computed using our method, is only slightly worse than the optimum UEP. | ||
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