• Title/Summary/Keyword: MPEG4 AVC

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A Bit Rate Control of MPEG-4 AVC Video Coding Using Adaptive Quantization (적응 양자화를 이용한 MPEG-4 AVC의 비디오 율 제어 방법)

  • 유충열;신규철;박재두;이명호
    • Journal of Broadcast Engineering
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    • v.9 no.2
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    • pp.142-150
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    • 2004
  • MPEG-4 AVC is an international video coding standard that is being developed. The standardization is mainly targeted at a very high compression ratio. MPEG-4 AVC is a general video coding technology that may be used in various applications. Therefore, MPEG-4 AVC needs an efficient rate control method to be applied in various communication environments. This paper is based on the rate control method that considers human visual characteristic. In this paper, we propose the constant bit rate control method using adaptive quantization and scene change detection. Experiments performed using various test images and experimentation results exhibits a favorable performance over existing rate control methods.

Hardware Implementation of a Fast Inter Prediction Engine for MPEG-4 AVC (MPEG-4 AVC를 위한 고속 인터 예측기의 하드웨어 구현)

  • Lim Young hun;Lee Dae joon;Jeong Yong jin
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.30 no.3C
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    • pp.102-111
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    • 2005
  • In this paper, we propose an advanced hardware architecture for the fast inter prediction engine of the video coding standard MPEG-4 AVC. We describe the algorithm and derive the hardware architecture emphasizing and real time operation of the quarter_pel based motion estimation. The fast inter prediction engine is composed of block segmentation, motion estimation, motion compensation, and the fast quarter_pel calculator. The proposed architecture has been verified by ARM-interfaced emulation board using Excalibur & Virtex2 FPGA, and also by synthesis on Samsung 0.18 um CMOS technology. The synthesis result shows that the proposed hardware can operate at 62.5MHz. In this case, it can process about 88 QCIF video frames per second. The hardware is being used as a core module when implementing a complete MPEG-4 AVC video encoder chip for real-time multimedia application.

Intra residual DPCM for H.264 lossless coding (H.264 무손실 부호화를 위한 Intra residual DPCM)

  • Han Ki-Hun;Lee Yung-Lyul
    • Journal of Broadcast Engineering
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    • v.11 no.2
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    • pp.174-180
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    • 2006
  • H.264/MPEG-4 AVC is jointly developed by ITU-T and ISO/IEC. It provides efficient coding efficiency compared with previous video standards. It reduced the bit rate by approximately $30%{\sim}70%$ while providing the same or better image quality. And, H.264/MPEG-4 AVC supports not only lossy coding but also lossless coding. In this paper, we suggest a method to improve lossless coding efficiency. Proposed method is based on Intra residual DPCM, it has same effect with the prediction from spatially nearest pixel. Also, proposed method does not broken decoder pipe-line. Experimental results, the method reduced the bit rate by approximately 12% in comparison with the H.264 Intra lossless coding. As a result, it is adopted into the H.264/MPEG-4 AVC Advanced 4:4:4 profile.

A Study on Fast Macroblock Partition Decision Method at H264 (H.264에서 고속 매크로 블록 분할 결정 방법에 관한 연구)

  • Song, Dae-Geon
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.14 no.6
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    • pp.99-105
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    • 2014
  • The performance improvement in MPEG-4 AVC is provided at the expense for higher computational complexity. Most of the complexity is caused by Inter prediction. To improve coding efficiency, some functions are added in H.264/MPEG-4 AVC, such as variable block size motion compensation, multi reference frame and quarter-pel motion compensation. A fast macroblock partition decision method is proposed in this paper. The macroblock size is efficiently determined by using the pixel value difference between encoding and the referred macroblock.

Hardware Implementation of Past Multi-resolution Motion Estimator for MPEG-4 AVC (MPEG-4 AVC를 위한 고속 다해상도 움직임 추정기의 하드웨어 구현)

  • Lim Young-hun;Jeong Yong-jin
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.29 no.11C
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    • pp.1541-1550
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    • 2004
  • In this paper, we propose an advanced hardware architecture for fast multi-resolution motion estimation of the video coding standard MPEG-1,2 and MPEG-4 AVC. We describe the algorithm and derive hardware architecture emphasizing the importance of area for low cost and fast operation by using the shared memory, the special ram architecture, the motion vector for 4 pixel x 4 pixel, the spiral search and so on. The proposed architecture has been verified by ARM-interfaced emulation board using Excalibur Altera FPGA and also by ASIC synthesis using Samsung 0.18 m CMOS cell library. The ASIC synthesis result shows that the proposed hardware can operate at 140 MHz, processing more than 1,100 QCIF video frames or 70 4CIF video frames per second. The hardware is going to be used as a core module when implementing a complete MPEG-4 AVC video encoder ASIC for real-time multimedia application.

A New Scanning Method for MPEG-4 AVC based Fine Granular Scalable Video Coding (MPEG-4 AVC 기반 미세입자 스케일러블 비디오 코딩을 위한 새로운 스캔 방법)

  • 정원식;박광훈;김규헌
    • Journal of Broadcast Engineering
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    • v.7 no.4
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    • pp.345-354
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    • 2002
  • In this paper, we introduce a new scanning method for MPEG-4 AVC based Fine Granular Scalable video coding that can significantly improve the subjective picture quality of a decoded scalable video. The proposed scanning method can guarantee the subjectively improved picture qualify of the decoded scalable video by encoding, transmitting and decoding the visually important region most-preferentially. From the simulation results, it has been found that the proposed scanning method can lead the FGS method to achieve significantly improved picture quality, especially on the region of interests.

Multi-View Video Coding Using Illumination Change-Adaptive Motion Estimation and 2D Direct Mode (조명변화에 적응적인 움직임 검색 기법과 2차원 다이렉트 모드를 사용한 다시점 비디오 부호화)

  • Lee, Yung Ki;Hur, Jae Ho;Lee, Yung Lyul
    • Journal of Broadcast Engineering
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    • v.10 no.3
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    • pp.321-327
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    • 2005
  • A MVC (Multi-view Video Coding) method, which uses both an illumination change-adaptive ME (Motion Estimation)/DC (Motion Compensation) and a 2D (Dimensional) direct mode, is proposed. Firstly, a new SAD (Sum of Absolute Difference) measure for ME/MC is proposed to compensate the Luma pixel value changes for spatio-temporal motion vector prediction. Illumination change-adaptive (ICA) ME/MC uses the new SAD to improve both MV (Motion Vector) accuracy and bit saving. Secondly, The proposed 2D direct mode that can be used in inter-view prediction is an extended version of the temporal direct mode in MPEG-4 AVC. The proposed MVC method obtains approximately 0.8dB PSNR (Peak Signal-to-Noise Ratio) increment compared with the MPEG-4 AVC simulcast coding.

A Past Elimination Algorithm of Impossible Candidate Vectors Using Matching Scan Method in Motion Estimation of Full Search (전영역 탐색 방식의 움직임 예측에서 매칭 스캔 방법을 이용한 불가능한 후보 벡터의 고속 제거 알고리즘)

  • Kim Jone-Nam
    • Journal of Korea Multimedia Society
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    • v.8 no.8
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    • pp.1080-1087
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    • 2005
  • Significant computations for full search (FS) motion estimation have been a big obstacle in real-time video coding and recent MPEG-4 AVC (advanced video coding) standard requires much more computations than conventional MPEG-2 for motion estimation. To reduce an amount of computation of full search (FS) algorithm for fast motion estimation, we propose a new and fast matching algorithm without any degradation of predicted images like the conventional FS. The computational reduction without any degradation in predicted image comes from fast elimination of impossible candidate motion vectors. We obtain faster elimination of inappropriate motion vectors using efficient matching units from localization of complex area in image data and dithering order based matching scan. Our algorithm reduces about $30\%$ of computations for block matching error compared with the conventional partial distortion elimination (PDE) algorithm, and our algorithm will be useful in real-time video coding applications using MPEG-4 AVC or MPEG-2.

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Temporal Directmode for B Picture in H.264 / MPEG-4 AVC (H.264 / MPEG-4 AVC에서의 B 픽쳐를 위한 시간적 다이렉트 모드)

  • 전병문
    • Journal of Broadcast Engineering
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    • v.7 no.4
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    • pp.300-309
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    • 2002
  • The object of this paper is to make temporal direct mode clear by providing a solution to the following problem : if the co-located block in the list 1 reference picture for direct mode has only the 1ist 1 motion vector or both the 1ist 0 and list 1 motion vectors, then which motion vector will be used for the direct mode motion vector calculation\ulcorner This paper also shows how to derive reference picture index and direct mode motion vector for each list in order to guarantee the high coding efficiency. when the co-located macroblock is in intra mode. Furthermore, the reasonable calculation methods for the direct mode motion vectors in the various cases are presented. Finally, experimental results show that the proposed temporal direct mode provides the comparable performance against the spatial direct mode. Therefore, the simulation proves that the proposed temporal direct mode is acceptable.

Research about Scalability selection method that apply to Image Scene (영상 화면에 적용한 확장적응성 선택 방법에 관한 연구)

  • Geon, Song Dae
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
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    • v.1 no.3
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    • pp.91-96
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    • 2008
  • An image scalablity function is noted as technology to embody One Source-Multi-use's Image division by the network Bandwidth and diversification of resolution of reception terminal recently. In MPEG present H.264/MPEG-4 AVC that do to standardization of SVC (Scalable Video Coding) that know go and SVC can offer space time SNR scalability. But, encoding that do scalable usually is known that encoding efficiency drops than encoding that do rain scalable during time and treatise that see. Examine technique to plan improvement of management quality as that aim to time, SNR scalability in treatise that see so and change FGS (Fine Granular Scalability) function that offer SNR scalability that do about scalability's particle size and encoding efficiency relation by SVC to foundation.

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