Mixed Chroma Sampling-Rate High Efficiency Video Coding for Full-Chroma Screen Content

Computer screens contain discontinuous-tone content and continuous-tone content. Thus, the most effective way for screen content coding (SCC) is to use two essentially different coders: a dictionary-entropy coder and a traditional hybrid coder. Although screen content is originally in a full-chroma...

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Vydané v:IEEE transactions on circuits and systems for video technology Ročník 23; číslo 1; s. 173 - 185
Hlavní autori: Lin, Tao, Zhang, Peijun, Wang, Shuhui, Zhou, Kailun, Chen, Xianyi
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: New York, NY IEEE 01.01.2013
Institute of Electrical and Electronics Engineers
Predmet:
Applied sciences
Bit rate
Circuit properties
Cloud computing
Decoding
Detection, estimation, filtering, equalization, prediction
Dictionaries
Dictionary-entropy coding
Display
Electric, optical and optoelectronic circuits
Electronic circuits
Electronics
Encoding
Exact sciences and technology
full-chroma
hybrid coding
Image processing
Information, signal and communications theory
screen content coding
Signal and communications theory
Signal convertors
Signal processing
Signal, noise
Telecommunications and information theory
Video coding
Visualization
Video coding
Performance evaluation
Dictionaries
Coding circuit
Rate distortion theory
Entropy codes
Entropy
Timbre
Computational complexity
Display screen
Optimization
Research and development
Subsampling
Video signal processing
Image quality
full-chroma
hybrid coding
screen content coding
Residual impurity
Sampling rate
Dictionary-entropy coding
Hybrid model
Low bit rate
ISSN:1051-8215, 1558-2205
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Shrnutí:Computer screens contain discontinuous-tone content and continuous-tone content. Thus, the most effective way for screen content coding (SCC) is to use two essentially different coders: a dictionary-entropy coder and a traditional hybrid coder. Although screen content is originally in a full-chroma (e.g., YUV444) format, the current method of compression is to first subsample chroma of pictures and then compress pictures using a chroma-subsampled (e.g., YUV420) coder. Using two chroma-subsampled coders cannot achieve high-quality SCC, but using two full-chroma coders is overkill and inefficient for SCC. To solve the dilemma, this paper proposes a mixed chroma sampling-rate approach for SCC. An original full-chroma input macroblock (coding unit) or its prediction residual is chroma-subsampled. One full-chroma base coder and one chroma-subsampled base coder are used simultaneously to code the original and the chroma-subsampled macroblock, respectively. The coder minimizing rate-distortion (R-D) is selected as the final coder for the macroblock. The two base coders are coherently unified and optimized to get the best overall coding performance and share coding components and resources as much as possible. The approach achieves very high visual quality with minimal computing complexity increment for SCC, and has better R-D performance than two full-chroma coders approach, especially in low bitrate.
ISSN:1051-8215
1558-2205
DOI:10.1109/TCSVT.2012.2223871