24 research outputs found
Mass cytometry as a platform for the discovery of cellular biomarkers to guide effective rheumatic disease therapy
Scalable Internet video streaming with unequal error protection
We present a transmission scheme for Internet video streaming that provides an acceptable video quality over a wide range of connection qualities. The proposed system consists of a scalable video coder which uses a fully standard compatible H.263 coder in its base layer. The scalable video coder is combined with unequal error protection using Reed-Solomon codes applied across packets. A theoretical framework which relates packet loss of an unequally protected layered video stream to picture quality at the decoder is presented. Simulation results show that, with our approach, the picture quality of a streamed video degrades gracefully as the packet loss probability ofanInternet connection increases.
A novel unequal error protection scheme for 3-D video transmission over cooperative MIMO-OFDM systems
Currently, there has been intensive research to drive three-dimensional (3-D) video technology over mobile devices. Most recently, multiple input multiple output (MIMO) with orthogonal frequency division multiplexing (OFDM) and cooperative diversity have been major candidates for the fourth-generation mobile TV systems. This article presents a
novel unequal error protection (UEP) scheme for 3-D video transmission over cooperative MIMO-OFDM systems. Several 3-D video coding techniques are investigated to find the
best method for 3-D video transmission over the error-prone wireless channels. View plus depth (VpD) has been found the best technique over other techniques such as simulcast
coding (SC) and mixed-resolution stereo coding (MRSC) in terms of the performance. Various UEP schemes are proposed to protect the VpD signals with different importance
levels. Seven video transmission schemes for VpD are proposed depending on partitioning the video packets or sending them directly with different levels of protection. An adaptive technique based on a classified group of pictures (GoP) packets according to their protection
priority is adopted in the proposed UEP schemes. The adaptive method depends on dividing GoP to many packet groups (PG's). Each PG is classified to high-priority (HP) and low-priority (LP) packets. This classification depends on the current signal-to-noise ratio (SNR) in the wireless channels. A concatenating form of the rate-variable low-density parity-check (LDPC) codes and the MIMO system based on diversity of space-time block codes (STBC) is employed for protecting the prioritized video packets unequally with different channel code rates. For channel adaptation, the switching operations between the proposed schemes are employed to achieve a tradeoff between complexity and performance of the proposed system. Finally, three protocols for 3-D video transmission are proposed to
achieve high video quality at different SNRs with the lowest possible bandwidth