• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 학술대회 논문집 정보 및 제어부문
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• pp.195-197
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• 2005

In the scalable extension of H.264/AVC, spatial scalability is provided residual information as encoding layered spatial resolution between layers. We use the inter-layer prediction to remove this redundancy. In the inter-layer prediction, as the prediction we can use the signal that is the upsampled signal of the lower resolution layer. In this case, coding efficiency can be different from optimal prediction by kinds of interpolation filter. This paper indicates technique to choose the interpolation filter and to enhance coding efficiency for finding more correct prediction in intra macroblock.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 학술대회 논문집 정보 및 제어부문
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• pp.189-191
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• 2005

In the scalable extension of H.264/AVC, the codec is based on a layered approach to enable spatial scalability. In each layer, the basic concepts of motion compensated prediction and intra prediction are employed as in standard H.264/AVC. Additionally inter-layer prediction algorithm between successive spatial layers is applied to remove redundancy. In the inter-layer prediction, as the prediction we can use the signal that is the upsampled signal of the lower resolution layer. In this case, coding efficiency can be variable as the kinds of interpolation filter. In this paper, we investigate the approach to select the interpolation filter for residual signal in order to optimal prediction.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1993년도 정기총회 및 추계학술대회 논문집 학회본부
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• pp.342-345
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• 1993

In this paper, we study the structure of the hierarchical coding method of video signal which can contain the multi resolution video signals. To preserve the compatibility with the conventional coding methods. we accomplished a scalable structure using the subband coding, maintaining enoughly the international coding structure. The proposed scheme showed the low PSNR, a little, when compared with the conventional scheme, but showed a good image quality perceptually and proved to have a advantage in the H/W implementation in a view of processing speed.

• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송공학회 2009년도 IWAIT
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• pp.23-27
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• 2009

A scalable video coding (SVC) extension to the H.264/AVC standard has been developed by the Joint Video Team (JVT). SVC provides spatial, temporal and quality scalability with high coding efficiency and low complexity. SVC is now developing the extension of the first version including color format scalability. The paper proposes to remove some luminance related header and luminance coefficients when an enhancement layer adds only additional color information to its lower layer. Experimental results shows 0.6 dB PSNR gain on average in coding efficiency compared with an approach using the existing SVC standard.

• 방송공학회논문지
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• 제12권2호
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• pp.93-101
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• 2007

혼재 네트워크 (heterogeneous networks) 환경에서는 IPTV 서비스를 위해 계층부호화 방식 (SVC, Scalable Video Coding)이 사용될 것이다. 본 논문은 공간적 (spatial), 품질적 (quality), 시간적 (temporal) 세 가지의 계층화 방식을 (scalable coding) 혼합한 혼합 계층화 방식 (hybrid scalable coding)에서 최종 디스플레이 되는 레벨에 따라 계층간 참조 (inter-layer reference)하는 계층을 결정하는 방식에 대하여 분석하였다. 공간적 계층화에서 위신호(僞信號) (aliasing) 방지를 위해 제거되는 고주파 성분과 품질적 계층화에서 양자화에 의해서 생기는 잡음간의 관계에 따라 공간적 하부 계층에서 요구되는 품질은 어느 정도가 적합한지를 결정한다. 본 논문은 공간적 계층화와 품질적 계층화의 레벨 선택은 비디오 시퀀스의 특성에 따라 결정되어야함을 보인다.

• ETRI Journal
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• 제33권2호
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• pp.155-162
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• 2011

The scalable extension of the H.264/AVC video coding standard (SVC) demonstrates superb adaptability in video communications. Joint source and channel coding (JSCC) has been shown to be very effective for such scalable video consisting of parts of different significance. In this paper, a new JSCC scheme for SVC transmission over packet loss channels is proposed which performs two-dimensional optimization on the quality layers of each frame in a rate-distortion (R-D) sense as well as on the temporal hierarchical structure of frames under dependency constraints. To compute the end-to-end R-D points of a frame, a novel reduced trellis algorithm is developed with a significant reduction of complexity from the existing Viterbi-based algorithm. The R-D points of frames are sorted under the hierarchical dependency constraints and optimal JSCC solution is obtained in terms of the best R-D performance. Experimental results show that our scheme outperforms the existing scheme of [13] with average quality gains of 0.26 dB and 0.22 dB for progressive and non-progressive modes respectively.

• 대한임베디드공학회논문지
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• 제9권2호
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• pp.81-86
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• 2014

In the scalable video coding standard, inter-layer prediction based on the coding information of the base layer was adopted to increase the coding performance. This prediction tool results in new syntax elements called motion_prediction_flag (mPF) and residul_prediction_flag(rPF), which are carried to notify the motion vector predictor (MVP) and reference block required in the motion compensation of the decoder. In this paper, an efficient coding method for mPF is proposed to enhance coding efficiency of the salable video coding standard. Through an analysis on the transmission of mPF based on the relationship between the MVPs, we discover the conditions where mPF is unnecessary at the decoder and suggest a modified rate-distortion (RD) cost function to make RD optimization more effective. Simulation results show that the proposed method offers BD rate savings of approximately 1.4%, compared with the conventional SVC standard.

• 방송공학회논문지
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• 제10권4호통권29호
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• pp.515-527
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• 2005

앞으로의 동영상의 부호화 방법은 압축효율을 최대화시키는 것뿐 만 아니라 다양한 단말기 및 변화하는 통신 환경에 친화적으로 대응할 수 있는 Scalable Video Codec으로 발전해야 한다. 이러한 요구에 부응하여 ISO/IEC와 ITU-T의 합작 팀인 JVT(Joint Video Team)에서 H.264기반 스케일러블 비디오 부호화(SVC : Scalable Video Coding)에 관한 표준화가 진행 중이다. 본 논문에서는 현재 표준화 진행 중인 H.264/AVC기반 SVC의 연구 방향 및 표준화 진행 현황을 소개하고 그 기술을 분석한다.

• ETRI Journal
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• 제28권2호
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• pp.239-242
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• 2006

In this letter, we propose a new functionality to scalable video coding (SVC), that is, the support of multiple region of interests (ROIs) for heterogeneous display resolution. The main objective of SVC is to provide temporal, spatial, and quality scalability of an encoded bitstream. The ROI is an area that is semantically important to a particular user, especially users with heterogeneous display resolutions. Less transmission bandwidth is needed compared to when the entire region is transmitted/decoded and then sub-sampled or cropped. To support multiple ROIs in SVC, we adopt flexible macroblock ordering (FMO), a tool defined in H.264, and based on it, we propose a way to encode and, independently, decode ROIs. The proposed method is implemented on the joint scalable video model (JSVM) and its functionality verified.

• 방송공학회논문지
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• 제18권2호
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• pp.249-260
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• 2013

고해상도의 고품질 비디오 서비스가 보편화됨에 따라 최근 초고해상도(UHD) 비디오 부호화를 위한 HEVC(High Efficiency Video Coding) 표준이 마무리되었으며, 향후 융합환경에서 HD 및 UHD 비디오를 동시에 제공하기 위한 스케일러블 확장 HEVC 표준화도 진행되고 있다. 본 논문에서는 UHD/HD 비디오를 동시에 제공하기 위한 H.264/SVC의 확장 부호화 기법을 제시한다. 즉, HEVC의 대표적인 부호화 툴인 Large Block 개념을 H.264/SVC에 적용함으로써 계층간 예측 및 신택스 부호화 등의 부호화 효율성을 개선한 부호화 기법을 제시하고 그 부호화 성능을 분석한다. 실험결과 Large Block을 적용한 SVC가 기존의 H.264/SVC에 비하여 평균 4.53% 내외의 비트 감소의 이득이 있음을 확인하였다.