• Title, Summary, Keyword: H.264

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H.264 to MPEG-2 Transcoding considering Distance of Motion Vectors (움직임벡터의 거리를 고려한 H.264 to MPEG-2 Transcoding)

  • Son, Nam-Rye;Jung, Min-A;Lee, Sung-Ro
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.35 no.5C
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    • pp.454-463
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    • 2010
  • After the efficiency of H.264 video compression has been announced, it replaced MPEG-2 standard in several applications. So transcoding methods of MPEG-2 to H.264 have been studying because there are variety devices and contents followed by MPEG-2. Although H.264 supported various service such as IPTV, DMB, digital broadcasting etc, but users using MPEG-2 devices cannot accessible to them. This paper propose H.264 to MPEG-2 transcoding for users of MPEG-2 devices without displacement H.264. The proposed method predicted a motion vector for MPEG-2 encoder after it extracted from motion vectors of variable blocks in H.264 to improve processing time. Also it predicted a optimal motion vector using modified boundary matching algorithm after grasped a special character for boundary and background of object. The experimental results from proposed method show a considerable reduction in processing time, as much as 68% averagely, with a small objective quality reduction in PSNR.

A Study using Variable Blocks of Boundary Matching Method for H.264 to MPEG-2 Video Transcoding (가변블럭의 경계정합방법을 이용한 H.264 to MPEG-2 Video Transcoding 연구)

  • Son, Nam-Rye;Jung, Min-A;Lee, Sung-Ro;Lee, Guee-Sang
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.34 no.11C
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    • pp.1049-1058
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    • 2009
  • After the efficiency of H.264 video compression has been announced, it replaced MPEG-2 standard in several applications. So transcoding methods of MPEG-2 to H.264 have been studying because there are variety devices and contents followed by MPEG-2. Although H.264 supported various service such as IPTV, DMB, digital broadcasting etc, but users using MPEG-2 devices cannot accessible to them. This paper propose H.264 to MPEG-2 transcoding for users of MPEG-2 devices without displacement H.264. The proposed method predicted a motion vector for MPEG-2 encoder after it extracted from motion vectors of variable blocks in H.264 to improve processing time. Also it predicted a optimal motion vector using modified boundary matching algorithm after grasped a special character for boundary and background of object. The experimental results from proposed method show a considerable reduction in processing time, as much as 65% averagely, with a small objective quality reduction in PSNR.

Implementation and Analysis of Performance Estimation Model of H.264/AVC Baseline Profile Decoder (H.264/AVC Baseline Profile Decoder의 성능 예측 모델의 구현과 분석)

  • Moon, Kyoung-Hwan;Song, Yong-Ho
    • Journal of the Institute of Electronics Engineers of Korea CI
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    • v.44 no.3
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    • pp.108-123
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    • 2007
  • As H.264/AVC standard has proven to be a key technology of multimedia application, many researches to improve H.264/AVC standard are actively conducted. Those researches are conducted in various ways such as algorithm analysis and improvement or structure enhancement for reducing bottlenecks of performance. Even though targets and directions of those studies are not the same, performance of H.264/AVC standard is commonly analyzed in the early phase. In analysis phase, potential problems with H.264/AVC standard are identified and the most critical problem which has serious effects on performance is determined. Therefore, analysis phase is one of the important steps to decide overall directions and targets of the research. This research proposes a mathematical model which can be used in the early performance analysis phase to estimate performance in conducting research of improving the performance of H.264/AVC Baseline Profile decoder. The proposed model is designed by considering many variables of H.264/AVC decoder operation so that it is easy to predict its performance according to changes in each element.

Implementation of IQ/IDCT in H.264/AVC Decoder Using GPGPU (GPGPU를 이용한 H.264/AVC 디코더)

  • Kim, Dong-Han;Lee, Kwang-Yeob
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.162-164
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    • 2010
  • H.264/AVC(Advanced Video Coding) is a standard for video compression. H.264/AVC provides good video quality at substantially lower bit rates than previous standards. In this papers, we propose the efficient architecture of H.264/AVC decoder using GPGPU. GPGPU can process many of operation in parallel. IQ/IDCT is possible that parallel processing in H.264/AVC decoding algorithm.

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Low-Power H.264 Decoder Design for Digital Multimedia Broadcasting (디지털 멀티미디어 방송을 위한 저전력 H.264 복호기 설계)

  • Lee, Seong-Soo;Lee, Won-Cheol
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.44 no.1
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    • pp.62-68
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    • 2007
  • H.264 video compression in digital multimedia broadcasting (DMB) shows significantly high compression ratio over conventional algorithms, while its required hardware cost and power consumption are also $3{\sim}5$ times larger. Consequently, low-hardware-cost and low-power H.264 decoder SoC is essential for commercial digital multimedia broadcasting terminals. This paper describes low-power design and implementation of core blocks in H.264 decoder SoC.

An H.264 Video Decoder which Guarantees Real-Time Operation with Minimum Degradation (최소의 화질 열화가 함께 실시간 동작이 보장되는 H.264 동영상 복호기)

  • Kim, Jong-Chan;Kim, Du-Ri;Lee, Dong-Ho
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.33 no.10C
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    • pp.805-812
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    • 2008
  • H.264 technology is considered as the heart of the next-generation video codec standard. Europe and other countries have actually specified H.264 technology as the video codec standard for HD broadcasting. However, due to the complexity of algorithm, it is still a difficult job to implement HD-level H.264 decoders in real-time software. In this paper, I have restricted a part of the decoding process, in order to implement an H.264 software video decoder which guarantees a real-time operation, and suggest an H.264 decoder that adaptively selects the algorithm to minimize image degradation. Performance of the suggested H.264 decoder was compared and verified through a PC simulation. As a consequence, when the suggested decoder was used in an environment where real-time decoding was difficult, it has achieved the minimal image degradation as well as real-time decoding in most cases.

A Real-time H.264 to MPEG-2 Transcoding for Ship to Shore Communication (선박-육지간 통신을 위한 실시간 H.264 to MPEG-2 트랜스코딩)

  • Son, Nam-Rye;Jeong, Min-A;Lee, Seong-Ro
    • Journal of the Institute of Electronics Engineers of Korea SP
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    • v.48 no.1
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    • pp.90-102
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    • 2011
  • Recently, the grade of users using wireless communication services which transmits and re-transmits to the signal via the broadcasting satellite have a variety. However the ships not preparing of H.264 standard devices should not received the realtime data because the broadcasting stations have transmitted the compressed video data through the satellite communication. Therefore this paper proposes H.264 to MPEG-2 transcoding for the ships using MPEG-2 devices. Proposed method improves a speed and object quality in H.264 to MPEG-2 transcoding by analysis features of macroblock modes in H.264. In the Intra mode of P-frame, it proposes new method by computing coincidence proportion after comparing of Intra mode methods of H.264 and MPEG-2. In the Inter mode, it proposes a PMV(predictive motion vector) considering movement of motion vectors in H.264 decoder. we reuses a PMV directly as like the final MV in MPEG-2 encoder and refinements the MV after coincidence ratio comparing of variable motion vectors of H.264 and these of MPEG-2. The experimental results from proposed method show a considerable reduction in processing time, as much as 70% and 67% respectively, with a small objective quality reduction in PSNR.

H.264/AVC to MPEG-2 Video Transcoding by using Motion Vector Clustering (움직임벡터 군집화를 이용한 H.264/AVC에서 MPEG-2로의 비디오 트랜스코딩)

  • Shin, Yoon-Jeong;Son, Nam-Rye;Nguyen, Dinh Toan;Lee, Guee-Sang
    • The Journal of the Korea institute of electronic communication sciences
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    • v.5 no.1
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    • pp.23-30
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    • 2010
  • The H.264/AVC is increasingly used in broadcast video applications such as Internet Protocol television (IPTV), digital multimedia broadcasting (DMB) because of high compression performance. But the H.264/AVC coded video can be delivered to the widespread end-user equipment for MPEG-2 after transcoding between this video standards. This paper suggests a new transcoding algorithm for H.264/AVC to MPEG-2 transcoder that uses motion vector clustering in order to reduce the complexity without loss of video quality. The proposed method is exploiting the motion information gathered during h.264 decoding stage. To reduce the search space for the MPEG-2 motion estimation, the predictive motion vector is selected with a least distortion of the candidated motion vectors. These candidate motion vectors are considering the correlation of direction and distance of motion vectors of variable blocks in H.264/AVC. And then the best predictive motion vector is refined with full-search in ${\pm}2$ pixel search area. Compared with a cascaded decoder-encoder, the proposed transcoder achieves computational complexity savings up to 64% with a similar PSNR at the constant bitrate(CBR).

An Efficient Algorithm for the Conversion of DCT Coefficients to H.264 Transform Coefficients in MPEG-2 to H.264 Transcoding (MPEG-2에서 H.264로의 Transcoding 과정에서 DCT 계수를 H.264 변환 계수로 변환하는 효율적인 알고리듬)

  • Kim, Yong-Jae;Lee, Chang-Woo
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.32 no.8C
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    • pp.729-737
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    • 2007
  • The H.264/AVC video coding standard provides higher coding efficiency compared to the conventional MPEG-2 standard. Since a lot of videos have been encoded using MPEG-2, the format conversion from MPEG-2 to H.264 is essential. In this paper, we propose an efficient method for the conversion of DCT coefficients to H.264/AVC transform coefficients. This conversion is essential, since $8{\times}8$ DCT and $4{\times}4$ integer transform are used in MPEG-2 and H.264/AVC, respectively. The mathematical analysis and computer simulation show that the computational complexity of the proposed algorithm is reduced compared to the conventional algorithm, while the loss caused by the conversion is negligible.

An MPEG2-to-H.264 Transcoding Method (MPEG2에서 H.264로의 트랜스코딩 기법)

  • Kim, Dong-Hyung;Jeong, Je-Chang
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.30 no.7C
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    • pp.706-715
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    • 2005
  • In this paper, we present a transcoding algorithm for converting an MPEG-2 video bitstream to an H.264 bitstream. The proposed transcoder consists of two parts. One is MPEG2 decoding part and the other is H.264 encoding part Because our algorithm is for transcoding in the spatial domain, MPEG2 decoding part carries out full decoding of MPEG2 bitstream. While, because macroblock type and coded block pattern in MPEG2 are significantly related to macroblock mode in H.264, macroblock mode is selected adaptively according to macroblock type and coded block pattern in H.264 decoding part. Furthermore, motion vector is also used as side-information for 16$\ctimes$16 macroblock mode. Simulation results show that the proposed transcoder yields high reduction of total transcoding time at comparable PSNR.