• Title, Summary, Keyword: encoder optimization

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System-level Function and Architecture Codesign for Optimization of MPEG Encoder

  • Choi, Jin-Ku;Togawa, Nozomu;Yanagisawa, Masao;Ohtsuki, Tatsuo
    • Proceedings of the IEEK Conference
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    • pp.1736-1739
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    • 2002
  • The advanced in semiconductor, hardware, and software technologies enables the integration of more com- plex systems and the increasing design complexity. As system design complexity becomes more complicated, System-level design based on the If block and processor model is more needed in most of the RTL level or low level. In this paper, we present a novel approach fur the system-level design, which satisfies the various required constraints and an optimization method of image encoder based on codesign of function, algorithm, and architecture. In addition, we show an MPEG-4 encoder as a design case study. The best tradeoffs between algorithm and architecture are necessary to deliver the design with satisfying performance and area constraints. The evaluations provide the effective optimization of motion estimation, which is in charge of an amount of performance in the MPEG-4 encoder module.

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Optimization of H.263 Encoder on a High Performance DSP (고성능 DSP 에서의 H.263 인코더 최적화)

  • 문종려;최수철;정선태
    • Proceedings of the IEEK Conference
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    • pp.99-102
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    • 2003
  • Computing environments of Embedded Systems are different from those of desktop computers so that they have resource constraints such as CPU processing, memory capacity, power, and etc.. Thus, when a desktop S/W is ported into embedded systems, optimization should be seriously considered. In this paper, we investigate several S/W optimization techniques to be considered for porting H.263 encoder into a high performance DSP, TMS320C6711. Through experiments, it is found that optimization techniques employed can make a big performance improvement.

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Optimized Implementation of Interpolation Filters for HEVC Encoder

  • Taejin, Hwang;Ahn, Yongjo;Ryu, Jiwoo;Sim, Donggyu
    • Journal of the Institute of Electronics and Information Engineers
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    • v.50 no.10
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    • pp.199-203
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    • 2013
  • In this paper, a fast algorithm of discrete cosine transform-based interpolation filter (DCT-IF) for HEVC (high efficiency video coding) encoder is proposed. DCT-IF filter accounts for around 30% of encoder complexity, according to the computational complexity analysis with the HEVC reference software. In this work, the proposed DCT-IF is optimized by applying frame-level interpolation, SIMD optimization, and task-level parallelization via OpenMP on a developed C-based HEVC encoder. Performance analysis is conducted by measuring speed-up factor of the proposed optimization technique on the developed encoder. The results show that speed-up factors by frame-level interpolation, SIMD, and OpenMP are approximately 38-46, 3.6-4.4, and 3.0-3.7, respectively. In the end, we achieved the speed-up factor of 498.4 with the proposed fast algorithm.

Statistical Characteristics and Complexity Analysis of HEVC Encoder Software (HEVC 부호화기 소프트웨어의 통계적 특성 및 복잡도 분석)

  • Ahn, Yongjo;Hwang, Taejin;Yoo, Sungeun;Han, Woo-Jin;Sim, Donggyu
    • Journal of Broadcast Engineering
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    • v.17 no.6
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    • pp.1091-1105
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    • 2012
  • In this paper, we analyzed statistical characteristics and complexity of HEVC encoder as a leading research of acceleration, optimization and parallelization. Computational complexity of the HEVC encoder is approximately twice the compression performance compared to H.264/AVC. But, the increase of encoder complexity remains a problem to be solved in the future. Before performing the research on acceleration, optimization and parallelization to reduce high complexity of HEVC encoder, we measure the complexity each module for HEVC encoder using it's reference software HM 7.1. We also measured the predicted complexity of fast HEVC encoder software, used in real applications, using HM 7.1 applying fast encoding method. The complexity is measured in terms of the operating cycle of the encoder software under the common test sequences and conditions in the Windows PC environment. In addition, we analyze statistical characteristics of HEVC encoder software according to encoding structures and limitation using coded bitstreams.

Fast intra mode decision using DCT coefficient distribution in H.264/AVC (H.264/AVC에서 DCT계수 분포를 이용한 고속 인트라 모드 결정 방법)

  • Hong, Sung-Wook;Lee, Yung-Lyul
    • Journal of Broadcast Engineering
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    • v.15 no.4
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    • pp.582-590
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    • 2010
  • he rate-distortion optimization (RDO) method in the H.264/AVC encoder is a technology that improves the coding efficiency, but increases the computational complexity. In this paper, a fast Intra mode decision algorithm using DCT (Discrete Cosine Transform) coefficients distribution is proposed to reduce the H.264 encoder complexity. The proposed method reduces the encoder complexity on average 68.40%, while the coding efficiency is slightly decreased compared with the H.264/AVC encoder.

Optimization of a Systolic Array BCH encoder with Tree-Type Structure

  • Lim, Duk-Gyu;Shakya, Sharad;Lee, Je-Hoon
    • International Journal of Contents
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    • v.9 no.1
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    • pp.33-37
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    • 2013
  • BCH code is one of the most widely used error correcting code for the detection and correction of random errors in the modern digital communication systems. The conventional BCH encoder that is operated in bit-serial manner cannot adequate with the recent high speed appliances. Therefore, parallel encoding algorithms are always a necessity. In this paper, we introduced a new systolic array type BCH parallel encoder. To study the area and speed, several parallel factors of the systolic array encoder is compared. Furthermore, to prove the efficiency of the proposed algorithm using tree-type structure, the throughput and the area overhead was compared with its counterparts also. The proposed BCH encoder has a great flexibility in parallelization and the speed was increased by 40% than the original one. The results were implemented on synthesis and simulation on FPGA using VHDL.

Real-time Optimization of H.264 Software Encoder on Embedded DSP System (임베디드 DSP 기반 시스템을 위한 H.264 소프트웨어 부호기의 실시간 최적화)

  • Roh, Si-Bong;Ahn, Hee-June;Lee, Myeong-Jin;Oh, Hyuk-Jun
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.34 no.10C
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    • pp.983-991
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    • 2009
  • While H.264/AVC is in wide use for multimedia applications such as DMB and IPTV service, we have limited usage cases for embedded real-time applications due to its high computational demand. The paper provides judicious guide line for optimization method selection, by presenting the detailed experiments data through the development process of a real time H.264 software encoder on embedded DSP. The experimental analysis includes an intensive profiling analysis, fast algorithm application, optimal memory assignment, and intrinsic-based instruction selection. We have realized a real-time software that encodes CIF resolution videos 15 fps on TMS320DM64x processors.

Optimal Parameter Selection of H.264 Encoder For Mobile Devices (모바일 기기를 위한 H.264 인코더의 최적 매개변수의 결정)

  • Ryu, Minhee;Kim, Hyungshin
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.13 no.10
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    • pp.4780-4785
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    • 2012
  • As many mobile devices such as smart phones and tablets are widely spread, optimized mobile video encoder used during video recording application is needed. In this paper, we implemented H.264/AVC base profile video encoder on a mobile device and empirically optimized control parameters of the encoder. As the experiment, we more than 100 test cases were designed with varying Lagrangian optimization, Hadamard Transform, search range, I-frame period, and reference frames. During the experiment, we measured picture quality, bit-rate, encoding time, motion estimation time, and power consumption. From the result, we can determine optimal values for the H.264 control parameters.

Fast mode decision by skipping variable block-based motion estimation and spatial predictive coding in H.264 (H.264의 가변 블록 크기 움직임 추정 및 공간 예측 부호화 생략에 의한 고속 모드 결정법)

  • 한기훈;이영렬
    • Journal of the Institute of Electronics Engineers of Korea SP
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    • v.40 no.5
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    • pp.417-425
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    • 2003
  • H.264, which is the latest video coding standard of both ITU-T(International Telecommunication Union-Telecommunication standardization sector) and MPEG(Moving Picture Experts Group), adopts new video coding tools such as variable block size motion estimation, multiple reference frames, quarter-pel motion estimation/compensation(ME/MC), 4${\times}$4 Integer DCT(Discrete Cosine Transform), and Rate-Distortion Optimization, etc. These new video coding tools provide good coding of efficiency compared with existing video coding standards as H.263, MPEG-4, etc. However, these new coding tools require the increase of encoder complexity. Therefore, in order to apply H.264 to many real applications, fast algorithms are required for H.264 coding tools. In this paper, when encoder MacroBlock(MB) mode is decided by rate-distortion optimization tool, fast mode decision algorithm by skipping variable block size ME/MC and spatial-predictive coding, which occupies most encoder complexity, is proposed. In terms of computational complexity, the proposed method runs about 4 times as far as JM(Joint Model) 42 encoder of H.264, while the PSNR(peak signal-to-noise ratio)s of the decoded images are maintained.

Fixed-point Processing Optimization of MPEG Psychoacoustic Model-II Algorithm for ASIC Implementation (MPEG 심리음향 모델-ll 알고리듬의 ASIC 구현을 위한 고정 소수점 연산 최적화)

  • Lee Keun-Sup;Park Young-Cheol;Youn Dae Hee
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.29 no.11C
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    • pp.1491-1497
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    • 2004
  • The psychoacoustic model in MPEG audio layer-III (MP3) encoder is optimized for the fixed-point processing. The optimization process consists of determining the data word length of arithmetic unit and the algorithm for transcendental functions that are often used in the psychoacoustic model. In order to determine the data word length, we defined a statistical model expressing the relation between the fixed-point operation errors of the psychoacoustic model and the probability of alteration of the allocated bits doe to these errors. Based on the simulations using this model, we chose a 24-bit data path and constructed a 24-bit fixed-point MP3 encoder. Sound quality tests using the constructed fixed-point encoder showed a mean degradation of -0.2 on ITU-R 5-point audio impairment scale.