Analysis-by-synthesis distortion computation for rate-distortion optimized multimedia streaming
ICME '03 Proceedings of the 2003 International Conference on Multimedia and Expo - Volume 3 (ICME '03) - Volume 03
Prioritisation of data partitioned MPEG-4 video over GPRS/EGPRS mobile networks
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Mobile devices are often characterized by their relatively low processing power. Applications running on these devices should therefore avoid heavy computations in order to save valuable battery lifetime. We present a selective packet discard scheme for streaming video which does not need receiver-side calculations, therefore perfectly satisfying this constraint in many common scenarios (e.g. Mobile IPTV). Decisions are made by the sender, based on a distortion estimation performed at the macroblock level. Our estimation procedure only requires superficial decoding of the video bitstream and takes important indicators like macroblock composition of frames, temporal dependencies and potential scene cuts into account. Experiments show that a considerable increase of perceived video quality by an average of 3 to 4dB in terms of PSNR compared to frame-level estimation methods can be achieved.