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RISS 인기검색어
- 검색키워드
- 저자 : HoangVan, (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
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Flexible Complexity Control Solution for Transform Domain Wyner-Ziv Video Coding
Xiem HoangVan,Byeungwoo Jeon IEEE 2012 IEEE transactions on broadcasting Vol.58 No.2
<P>Most Wyner-Ziv (WZ) video coding solutions in the literature focus on improving the coding efficiency. Recently, a few papers have addressed problems related to the complexity distribution of WZ video coding by sharing the motion estimation process between the encoder and decoder. However, these methods turn out to significantly increase the computational complexity of the encoding process, due to the presence of motion estimation at the encoder, which is less appealing in WZ coding applications, since their primary requirement is a low-encoding complexity. To address this problem, we propose a different approach to complexity control based on the adaptive selection between WZ and intra coding in the WZ frames. This solution is more flexible than the previous ones in that it can be implemented either at the encoder or decoder. The proposed intra mode selection algorithm exploits the spatial and temporal coherency in the transform domain Wyner-Ziv video coding (TDWZ), in order to achieve complexity control between the WZ encoder and decoder. The experimental results illustrate that the proposed algorithm not only effectively distributes the computational complexity over the encoder and decoder, but also retains the low-complexity feature at the encoder. This should make it attractive for a large number of real video applications of the WZ video coding paradigm. Moreover, the coding efficiency of the conventional TDWZ codec without intra mode decision is improved by up to 2 dB by the proposed intra mode selection algorithm.</P>
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Early SKIP Mode Decision for HEVC with Hierarchical Coding Structure
Xiem HoangVan,Minh Dinh Bao,Byeungwoo Jeon 대한전자공학회 2020 IEIE Transactions on Smart Processing & Computing Vol.9 No.6
To meet real-time video communications, an investigation of early SKIP mode decisions is still important in many practical applications of High-Efficiency Video Coding (HEVC) encoders. On the other hand, in most current state-of-the-art early SKIP mode decision methods, the temporal layer index (TId), which is commonly used in the hierarchical coding structure, has not been fully exploited. In this regard, this paper proposes a novel early SKIP mode decision method for a HEVC encoder using TId-based rate-distortion (RD) modeling. In the proposed method, two new SKIP mode-checking conditions were introduced based on statistical analysis on TId and the RD-cost correlation. The experimental results showed that the proposed early SKIP mode decision method outperformed the relevant state-of-the-art HEVC complexity reduction methods significantly, with an encoding time saving of approximately 47% while having a BD-rate loss of only 0.45%.
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Performance Evaluation of Frame-loss Error-concealment Solutions for the SHVC Standard
Thuc Nguyen Huu,Duong Dinh Trieu,Byeungwoo Jeon,Xiem HoangVan 대한전자공학회 2017 IEIE Transactions on Smart Processing & Computing Vol.6 No.6
Scalable High Efficiency Video Coding (SHVC) has been emerging as an efficient video coding solution for adaptive video streaming and conferencing. SHVC is designed with a layered coding structure in which High Efficiency Video Coding (HEVC) tools are employed as core elements. However, compression efficiency and error sensitivity associated with efficient HEVC tools make this scalable codec less attractive for practical video transmission, especially when the loss of packets or video frames occurs. This problem severely impacts the display quality of received video. To address this problem, we propose efficient error concealment (EC) methods that compensate for a whole frame that is lost and that mitigate the error propagation problem occurring in practical video transmissions using SHVC. The presented EC methods mainly rely on the decoded information; thus, it is easily integrated into the SHVC decoder as a post-processing component. The experimental results obtained for both subjective and objective quality assessments show that the inter-layer correlation-based EC approach typically provides the highest concealed frame quality; thus, it is highly recommended for practical video transmission.
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A Novel Fusion Method for 3D-TV View Synthesis Using Temporal and Disparity Correlations
Dinh Trieu Duong,Minh Le Dinh,Byeungwoo Jeon,Xiem HoangVan 대한전자공학회 2019 IEIE Transactions on Smart Processing & Computing Vol.8 No.6
View synthesis like depth-image-based rendering (DIBR) plays a significant role in content creation for three-dimensional television. However, perceptual errors introduced by current view synthesis often result in severe distortions in synthesized images. In this paper, we propose a novel view synthesis fusion (VSF) method that adaptively exploits temporal and disparity correlations to improve the quality of the synthesized picture. The proposed VSF method defines a robust correlation assessment metric for fusing several pre-created virtual-view candidates. Unlike conventional methods, the proposed fusion algorithm is applied to both hole and non-hole areas. Experimental results show the proposed method significantly outperforms in peak signal-to-noise ratio (PSNR) and subjective visual quality, compared to other conventional methods.
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