• Title/Summary/Keyword: High 4:4:4 Predictive profile

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Real-time H.264/AVC High 4:4:4 Predictive Decoder Using Multi-Thread and SIMD Instructions (멀티쓰레드와 SIMD 명령어를 이용한 실시간 H.264/AVC High 4:4:4 Predictive 디코더의 구현)

  • Kim, Yong-Hwan;Kim, Je-Woo;Choi, Byeong-Ho;Lee, Seok-Pil;Paik, Joon-Ki
    • 한국정보통신설비학회:학술대회논문집
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    • 2007.08a
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    • pp.350-353
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    • 2007
  • This paper presents an real-time implementation of H.264/AVC High 4:4:4 Predictive profile decoder using general-purpose processors by exploiting multi-threading technique and Single Instruction Multiple Data (SIMD) instructions without any quality degradation. We analyze differences between the existing High profile and High 4:4:4 Predictive profile decoder, and show various optimization techniques to decode high fidelity and high definition (HD) video in real-time. Simulation results show that the proposed decoder can play high fidelity HD video at average 40 frames per seconds (fps) for the IBBrBP bistream and about 50 fps for the Intra-only bitstream.

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Enhanced RGB Video Coding Based on Correlation in the Adjacent Block (인접블록의 상관관계에 기반한 RGB video coding 개선 알고리즘)

  • Kim, Yang-Soo;Jeong, Jin-Woo;Choe, Yoon-Sik
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.58 no.12
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    • pp.2538-2541
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    • 2009
  • H.264/AVC High 4:4:4 Intra/Predictive profiles supports RGB 4:4:4 sequences for high fidelity video. RGB color planes rather than YCbCr color planes are preferred by high-fidelity video applications such as digital cinema, medical imaging, and UHDTV. Several RGB coding tools have therefore been developed to improve the coding efficiency of RGB video. In this paper, we propose a new method to extract more accurate correlation parameters for inter-plane prediction. We use a searching method to determine the matched macroblock (MB) that has a similar inter-color relation to the current MB. Using this block, we can infer more accurate correlation parameters to predict chroma MB from luma MB. Our proposed inter-plane prediction mode shows an average bits saving of 15.6% and a PSNR increase of 0.99 dB compared with H.264 high4:4:4 intra-profile RGB coding. Furthermore, extensive performance evaluation revealed that our proposed algorithm has better coding efficiency than existing algorithms..

The Use of Health Behavior Theory for Effective Health Counselling (효과적 건강상담을 위한 제 보건행동이론의 활용방안에 대한 연구)

  • 김혜경
    • Korean Journal of Health Education and Promotion
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    • v.19 no.1
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    • pp.149-170
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    • 2002
  • The use of health behavior theory in health counseling may improve its effectiveness. This article provides an overview of health behavior theory and guidelines on how to incorporate various theories into effective health counseling. Models that focus on behavior change at the individual level are described, including the health belief model, which focuses on individual health beliefs; social learning theory, which emphasizes interactions between individual, behavior and its environment; theory of reasoned action and theory of planned behavior, which examines factors influencing behavioral intention;. the stages of change model, which focuses on one's stage of readiness for change. Research review provides explanatory and predictive utility of four health behavior theories. Suggestions for effective health counselling are as follows: 1. Unified theoretical framework incorporating key concepts from different health behavior theories is needed. 2. Need assessment should be included in counselling process. 3. Behavior-change counselling should target changes in one or more key variables previously identified. 4. Focusing on promotional efforts into a high profile behavior(gateway behavior) can be an an adjunctive way of initiating other health promotion behaviors. 5. Counselling should be staged based, and different strategies and processes of changes should be applied at different stages.