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Dive into the research topics where Bongsoo Jung is active.

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Featured researches published by Bongsoo Jung.


Journal of Visual Communication and Image Representation | 2008

Adaptive slice-level parallelism for H.264/AVC encoding using pre macroblock mode selection

Bongsoo Jung; Byeungwoo Jeon

In order to achieve high computational performance and low power consumption, many modern microprocessors are equipped with special multimedia instructions and multi-core processing capabilities. The number of cores on a single chip increases double every three years. Therefore, besides complexity reduction by smart algorithms such as fast macroblock mode selection, an effective algorithm for parallelizing H.264/AVC is also very crucial in implementing a real-time encoder on a multi-core system. This algorithm serves to uniformly distribute workloads for H.264/AVC encoding over several slower and simpler processor cores on a single chip. In this paper, we propose a new adaptive slice-size selection technique for efficient slice-level parallelism of H.264/AVC encoding on a multi-core processor using fast macroblock mode selection as a pre-processing step. For this we propose an estimation method for the computational complexity of each macroblock using pre macroblock mode selection. Simulation results, with a number of test video sequences, show that, without any noticeable degradation, the proposed fast macroblock mode selection reduces the total encoding time by about 57.30%. The proposed adaptive slice-level parallelism has good parallel performance compared to conventional fixed slice-size parallelism. The proposed method can be applied to many multi-core systems for real-time H.264 video encoding.


international conference on multimedia and expo | 2004

Selective temporal error concealment algorithm for H.264/AVC

Bongsoo Jung; Byeungwoo Jeon; Myung Don Kim; BongSue Suh; Song In Choi

The paper presents a new selective temporal error concealment algorithm (STEC) for error-corrupted H.264/AVC video bitstreams over the cdma2000 (or UMTS) air interface. The proposed algorithm performs selective temporal error concealment depending on whether a lost MB (macroblock) is in the background or foreground. It is shown that under the FMO coding mode of H.264/AVC, the proposed algorithm provides PSNR gain up to 1.18dB compared to the algorithm built into the H.264/AVC test model. In addition, the proposed STEC has an average PSNR improvement of 0.33dB compared with that under the N slice coding mode.


international conference on advanced communication technology | 2007

Efficient Fast Intra Mode Decision using Transform Coefficients

G. Hwang; J. Park; Bongsoo Jung; Kwang-Pyo Choi; Young-Hun Joo; Yun-Je Oh; Byeungwoo Jeon

The H.264/AVC standard substantially improved its coding efficiency and subjective quality by using the intra prediction technique and the adaptive coding between inter and intra modes based on rate-distortion optimization. This encoding scheme, however, increases encoding complexity dramatically and causes troubles in its practical applications in the real-time mobile environment. In order to decrease the complexity, various methods are proposed but most of them take only its current block into consideration for selecting candidate intra modes, which naturally causes degradation in PSNR (peak signal to noise ratio) and bitrate. The proposed fast intra mode decision finds the candidate modes by analyzing transformed coefficients of neighboring blocks as well. We verify this proposed scheme reduces encoding complexity without noticeable degradation of PSNR and bitrate.


multimedia signal processing | 2009

Computational complexity scalable scheme for power-aware H.264/AVC encoding

Ho-Young Lee; Bongsoo Jung; Jooyoung Jung; Byeungwoo Jeon

Recent development of portable devices and prevalence of high-throughput communication infrastructures make the video encoding in portable devices on high demand. However, its computational complexity makes the implementation of realtime video encoder on portable devices extremely difficult. Many fast algorithms to solve the problems are not efficient from the view point of worst workload since they consider only reduction of average computational complexity. Moreover, since the amount of reduction of computational complexity highly depends on video sequence, fixed fast algorithms cannot always achieve their full potential for real-time encoding. In this paper, we analyze the complexity of H.264/AVC video coding tools, and develop two parameters for complexity control. Consequently, we design a power-aware complexity scalable encoding scheme implementable on embedded system. Using our target embedded system, the proposed method is verified to save power by about 50%.


ieee region 10 conference | 2007

Fast inter mode selection for H.264/AVC using large block and zero motion consistency history

Bongsoo Jung; Byeungwoo Jeon

To achieve high coding efficiency, the new H.264/AVC standard developed more advanced coding tools than previous standards such as powerful prediction techniques and rate-distortion optimization. Although it can achieve high coding efficiency, it requires huge computation. To reduce the complexity, we propose a fast inter mode selection with early P8x8 mode rejection and early 16x16 block size detection by referring to two newly proposed block history measures. Simulation results show that without any noticeable degradation, the proposed method reduces total motion estimation time by 49% on average and overall encoding time by 30%. Furthermore the hybrid usage of the proposed method and the early SKIP mode decision in H.264/AVC reference model reduces whole encoding time by 47% on average.


visual communications and image processing | 2003

Error-resilient performance evaluation of MPEG-4 and H.264

Bongsoo Jung; Young Hooi Hwang; Byeungwoo Jeon; Myung Don Kim; Song-In Choi

Recent advances in video coding technology have resulted in rapid growth of application in mobile communication. With this explosive growth, reliable transmission and error resilient technique become increasingly necessary to offer high quality multimedia service. This paper discusses the error resilient performances of the MPEG-4 simple profile under the H.324/M and the H.264 baseline under the IP packet networks. MPEG-4 simple profile has error resilient tools such as resynchronization marker insertion, data partitioning, and reversible VLC. H.264 baseline has the flexible macroblock ordering scheme, and others. The objective and subjective quality of decoded video is measured under various random bit and burst error conditions.


asia pacific conference on circuits and systems | 2008

Pooled zero vector coding for enhanced compression of motion vectors

Bongsoo Jung; Byeungwoo Jeon

In this paper, we propose a pooled zero vector coding scheme for improving coding efficiency of moving pictures. Since motion vector takes considerable portion of compressed bitstream, its higher compression is very essential for improving the coding efficiency of moving pictures beyond that given by the state-of-the-art coder of H.264/AVC. Since there is considerable correlation among motion vectors of adjacent blocks, lots of macroblocks end up with all their blocks having zero residual motion vector after differential motion vector coding using their individual predicted motion vectors. Motivated by this observation, we develop a new macroblock coding mode of ldquopooled zero vector codingrdquo to efficiently represent such cases. Compared to the H.264/AVC standard with several well-known video test sequences, total bitrate saving of average 2.07% is reported.


international symposium on industrial electronics | 2009

Fast subpel motion estimation using selective motion vector accuracy of inter-mode decision for H.264/AVC

Jooyoung Jung; Bongsoo Jung; Byeungwoo Jeon; Woong Choi; Dae-Sung Cho; Yong-Serk Kim

MPEG-4 Part-10 AVC/H.264 (H.264/AVC) is the newest video coding standard developed and finalized in March 2003 by the Joint Video Team (JVT) of ISO/IEC (MPEG) and ITU-T (VCEG). It includes many powerful features such as multiple reference pictures, variable block-size motion compensation, quarter-pel accuracy motion compensation, and so on. As a result, it achieves high coding performance but at the expense of huge computational complexity. To reduce the complexity while keeping the same coding performance, we propose a low complexity subpel motion estimation method using two content-aware decision criteria. Based on the criteria, four different levels of subpel motion estimation are proposed to achieve low complexity subpel motion estimation. Simulation results show that the proposed method reduces total encoding time by 55.53% on average and subpel motion estimation time by 82.2% on average.


Proceedings of SPIE, the International Society for Optical Engineering | 2007

Adaptive slice-level parallelism for real-time H.264/AVC encoder with fast inter mode selection

Bongsoo Jung; Ho-Young Lee; Kwanghyun Won; Byeungwoo Jeon

In order to achieve high computational performance and low power consumption, modern microprocessors are usually equipped with special multimedia instructions, multi-threading, and/or multi-core processing capabilities. Therefore, parallelizing H.264/AVC algorithm is crucial in implementing real-time encoder on multi-thread (or -core) processor. Also, there is a significant need for investigation on complexity reduction algorithms such as fast inter mode selection. Multi-core system makes it possible to uniformly distribute workloads of H.264/AVC over a number of slower and simpler processor cores each consisting of single high performance processor. Therefore, in this paper, we propose a new adaptive slice size selection technique for efficient slice-level parallelism of H.264/AVC encoder on multi-core (or multi-thread) processor using fast inter mode selection as a pre-processing. The simulation results show that the proposed adaptive slice-level parallelism has a good parallel performance compared to fixed slice size parallelism. The experiment methods and results can be applied to many multi-processor systems for real-time H.264 video encoding.


international symposium on broadband multimedia systems and broadcasting | 2008

Low complexity video encoding using new motion vector skip mode coding

Bongsoo Jung; Byeungwoo Jeon; Kwang Pyo Choi; Young-Hun Joo; Yun-Je Oh

In this paper, we propose a new low complexity video encoding method targeted specially for power-constrained mobile devices. Since the motion estimation takes most of computation and thus battery consumption, the proposed encoding method restricts the possible block size of motion estimation to 16times16 and 8times8. It curtails considerable amount of computation off the encoder, but brings non- acceptable degradation in coding efficiency. The problem is overcome by the proposed new motion vector skip coding whose key is to best utilize the spatial correlation between motion vectors of adjacent 8times8 blocks by effective motion vector coding. The experimental results with several well- known test video sequences verify that far better performance of the proposed method is obtained against the H.264/AVC baseline encoder of similar configuration.

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Young-Hun Joo

Information and Communications University

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Ho-Young Lee

Seoul National University

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Myung Don Kim

Electronics and Telecommunications Research Institute

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