Title :
An adaptive hybrid coding scheme for HDTV and digital video sequences
Author :
Al-Asmari, Awad Kh
Author_Institution :
Dept. of Electr. Eng., King Saud Univ., Riyadh, Saudi Arabia
fDate :
8/1/1995 12:00:00 AM
Abstract :
In this paper, the image sequences are decomposed into seven sub-bands in the spatial domain using GQMF filters. Then, the base-band is interframe encoded using a simple 3-D block-matching method and LADVQ search algorithm. This band is used to decide the codebooks and the blocks sizes for encoding the high frequency bands. To reduce the complexity, the high-bands are encoded using the LAVQ. The simulation results show that good quality pictures can be obtained at a bit rate as low as 0.290 bpp (about 15 Mbits/sec). This rate will facilitate the transmission of three HDTV channels via a DS3 rated 45 Mbits/sec channel. This algorithm is tested on digital video sequences. We obtain high quality reconstructed images at an average bit rate of 0.460 bpp with PSNR of 35.04 dB
Keywords :
adaptive codes; block codes; computational complexity; digital television; high definition television; image reconstruction; image sequences; quadrature mirror filters; vector quantisation; video coding; 3D block-matching method; GQMF filters; HDTV; LADVQ search algorithm; adaptive hybrid coding scheme; algorithm; base-band; codebooks; decomposition; digital video sequences; high frequency bands; high quality reconstructed images; image sequences; interframe encoding; simulation; spatial domain; sub-bands; Bit rate; Filters; Frequency; HDTV; Image coding; Image sequences; Redundancy; Transform coding; Vector quantization; Video sequences;
Journal_Title :
Consumer Electronics, IEEE Transactions on
