Algorithm and Architecture Design of Multi-layer Video Coding Engine with Hybrid Scheme for Wireless Video Links
Date Issued
2008
Date
2008
Author(s)
Chen, Han-Ru
Abstract
Variant consuming electronic products make the home digital multimedia integrations very different from the past. For Example, a display device might be a portable handout, a flat panel, or a projector. It must be much more convenientf these devices are linked in a wireless system. Wireless system has developed for years but still exists a large gap to the wire linkage, especially in bandwidth variation. Furthermore, the desire of enjoy high definition video quality makes the video raw data cannot be compression in lossy way. As the result, it is inevitable to encode the video raw data in a wireless link system. A video coding for wireless link system has some particular requirements as following. It requires low latency for real-time applications. Besides, it concerns more error robustness forireless transmission noise. Moreover, if the Full-HD(1080p) 60fps video source would like to transmission in a wireless-USB(480Mbps), the video coding must provide a 5-10 times compression ratio.n this thesis, a multi-layer encoder with hybrid scheme is proposed. In this encoder, there are three main units, which are classify unit, intra unit, and JLS unit.he classify unit can decompose the video source frame into two layers which are natural picture layer and graphic interface layer. This can cause a previous mode decision instead of a latter one, and processing each layers in different scheme.he intra unit is near-lossless intra prediction core. It is used to encode the natural picture region , and reconstruct a near-lossless region. The JLS unit is used toncode the graphic interface region with the lossless JPEG-LS algorithm. These near-lossless natural region and graphic interface region are the base-layer bitstream of the proposed encoder. Besides, the difference of the origin natural picture region and the reconstructed one is sent to JLS unit to encode again as a enhancement-layer bitstream.he multi-layer classification is based on the assumption of the video source is usually a compound frame consisting of natural picture and graphic user interface.his assumption causes the video raw data could be compressed more efficiently.he hybrid scheme coding realizes a flexibility of adaptive bitstream for wireless bandwidth variations. The decoder can choose to decode both base-layer and enhancement-layer bitstream to reconstruct a lossless frame while the bandwidth is unlimited. It can also choose and decode only the base-layer bitstream to reconstruct a near-lossless frame in low bandwidth environment. To prevent temporalrror propagations, the proposed encoder dose not use inter prediction. Besides, this can also reduce the computation complexity and latency.he proposed multi-layer encoder with hybrid scheme is implemented in this thesis.he prototype chip is fabricated using UMC 90um technology, and the chip size is 2.4?2.2mm2. The design working frequency is 216MHz, and the processing capability of the chip is 124MSamples/sec. The max specification of videorocessing is 1920?1080 60Hz.
Subjects
wireless video system
lossless coding
multi-layer
Type
thesis
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