• Title/Summary/Keyword: Variable block estimation

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A study on variable block matching algorithm using differential image and quad tree (차영상과 4진트리 구조를 이용한 가변 블럭정합 알고리즘에 관한 연구)

  • 정일화;이대영
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.21 no.11
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    • pp.2768-2775
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    • 1996
  • VariableBlock Matching algorithm is effective for the estimation of motion vector at complexor edge region by means of using variable block size with respect to the image block. But since VBM algorithm requires considerable number of operations, to solve this problem, we present an algorithm which uses difference images and quad tree structure, and estimates motion using various fast block matching algorithms.

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A Selective Motion Estimation Algorithm with Variable Block Sizes (다양한 블록 크기 기반 선택적 움직임 추정 알고리즘)

  • 최웅일;전병우
    • Journal of Broadcast Engineering
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    • v.7 no.4
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    • pp.317-326
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    • 2002
  • The adaptive coding schemes in H.264 standardization provide a significant ceding efficiency and some additional features like error resilience and network friendliness. The variable block size motion compensation using multiple reference frames is one of the key H.264 coding elements to provide main performance gain, but also the main culprit that increases the overall computational complexity. For this reason, this paper proposes a selective motion estimation algorithm based on variable block size for fast motion estimation in H.264. After we find the SAD(Sum of Absolute Difference) at initial points using diamond search, we decide whether to perform additional motion search in each block. Simulation results show that the proposed method is five times faster than the conventional full search in case of search range $\pm$32.

Fast Variable-size Block Matching Algorithm for Motion Estimation Based on Bit-patterns (비트패턴 기반 움직임 추정을 위한 고속의 가변 블록 정합 알고리즘)

  • Kwon, Heak-Bong;Song, Young-Jun
    • The Journal of the Korea Contents Association
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    • v.3 no.2
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    • pp.11-18
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    • 2003
  • In this paper, we propose a fast variable block matching algorithm for motion estimation based on bit-patterns. Motion estimation in the proposed algorithm is peformed after the representation of image sequence is transformed 8-bit pixel values into 1-bit ones by the mean pixel value of search block, which brings a short searching time by reducing the computational complexity. Moreover, adaptive searching methods according to the motion information of the block make the procedure of motion estimation efficient by eliminating unnecessary searching processes of low motion block and deepening a searching procedure in high motion block. Experimental results show that the proposed algorithm provides bettor performance - average 0.5dB PSNR improvement and about 99% savings in the number of operations - than full search Hock matching algorithm with a fixed block size.

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Fast Frame Selection Method for Multi-Reference and Variable Block Motion Estimation (다중참조 및 가변블록 움직임 추정을 위한 고속 참조영상 선택 방법)

  • Kim, Sung-Dae;SunWoo, Myung-Hoon
    • Journal of the Institute of Electronics Engineers of Korea SP
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    • v.45 no.6
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    • pp.1-8
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    • 2008
  • This paper introduces three efficient frame selection schemes to reduce the computation complexity for the multi-reference and variable block size Motion Estimation (ME). The proposed RSP (Reference Selection Pass) scheme can minimize the overhead of frame selection. The MFS (Modified Frame Selection) scheme can reduce the number of search points about 18% compared with existing schemes considering the motion of image during the reference frame selection process. In addition, the TPRFS (Two Pass Reference frame Selection) scheme can minimize the frame selection operation for the variable block size ME in H.264/AVC using the character of selected reference frame according to the block size. The simulation results show the proposed schemes can save up to 50% of the ME computation without degradation of image Qualify. Because the proposed schemes can be separated from the block matching process, they can be used with any existing single reference fast search algorithms.

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.

Design of HEVC Motion Estimation Engine with Search Window Data Reuse and Early Termination (탐색 영역 데이터의 재사용 및 조기중단이 가능한 HEVC 움직임 추정 엔진 설계)

  • Hur, Ahrum;Park, Taewook;Lee, Seongsoo
    • Journal of IKEEE
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    • v.20 no.3
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    • pp.273-278
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    • 2016
  • In HEVC variable block size motion estimation, same search window data are duplicatedly used in each block size. It increases memory bandwidth, and it is difficult to exploit early termination. In this paper, largest block size and its corresponding smaller block sizes with same positions are performed at the same time. It reduces memory bandwidth and computation by reusing search window data and computation results. In the early termination, image quality can be degraded when it determines early termination by observing largest block size only, since smaller block sizes cannot be equally terminated due to their relative positions. So, in this paper, processing order of early termination is changed to perform smaller block sizes in turns. The designed motion estimation engine was described in Verilog HDL and it was synthesized and verified in 0.18um process technology. Its gate count and maximum operating frequency are 36,101 gates and 263.15 MHz, respectively.

Efficient motion estimation and compensation methods for scalable video coding using 3D wavelet transform (3차원 웨이블릿 기반의 스케일러블 비디오 부호화를 위한 효과적인 움직임 예측 및 보상 방법)

  • 김종호;이준재;정제창
    • Proceedings of the IEEK Conference
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    • 2003.11a
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    • pp.433-436
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    • 2003
  • In this paper, the efficient motion estimation and compensation method for 3 dimensional wavelet transform is proposed. Recently, since the compression performance and scalable functionality are provided by wavelet transform, many researches have been carried out for applying to the video compression. For the temporal filtering, motion estimation and compensation techniques are used, but the unconnected pixels, which are produced by motion compensation result into the degradation of coding performance and quality of the picture. For the efficient motion compensated temporal filtering by reducing the number of these unconnected pixels, we propose the variable block size motion estimation and compensation method. Also we propose a method that determines the block size using rate-distortion optimization technique according to the local characteristics of the frame. The simulation results show the improved performances than the MPEG-4 scalable coding methods and the 3 dimensional wavelet coding methods using fixed block size motion estimation and compensation.

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Variable Sub-pixel Motion Vector Resolution Based on Block Mode Motion Estimation for H.264/AVC

  • Tran, Trung-Kien;Kim, Dae-Yeon;Lee, Yung-Lyul
    • Proceedings of the IEEK Conference
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    • 2008.06a
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    • pp.807-808
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    • 2008
  • In H.264, sub-pel motion estimation (ME) has strong effect when coding video sequences. 1/4-pel performs better at low bitrate while 1/8-pel gives better results at high bitrate. In this paper, a variable sub-pixel motion vector resolution based on block mode motion estimation method is proposed. Experiment results show that the proposed method can take the advantage of 1/4-pel at low bitrate and 1/8-pel at high bitrate. In addition to that, time is reduced from 14% to 53% compared to KTA1.3 with 1/8-pel motion vector (MV) resolution.

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An Adaptive Motion Estimation Technique Using Temporal Continuity of Motion

  • Park, Jung-Hyun;Lee, Kyeong-Hwan;Kim, Duk-Gyoo
    • Proceedings of the IEEK Conference
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    • 2000.07a
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    • pp.7-10
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    • 2000
  • Fast block motion estimation technique is proposed to reduce the computational complexity in video coding. In the conventional methods the size of search region is fixed. For small motion regions like background the small size of sea of search region is enough to find a block motion. But for active motion regions the large size of search region is preferred to figure out the accurate motion vector. Therefore, it is reasonable that a block motion is estimated in the variable search region (both the size and the position of it). That is to say, the search region varies according to the predicted motion characteristics of a block. The block motion in video frames has temporal continuity and then the search region of a current block is predicted using the block motion of previous blocks. The computational complexity of the proposed technique is significantly reduced with a good picture quality compared to the conventional methods.

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Disparity Estimation Algorithm using Variable Blocks and Search Ranges (가변블록 및 가변 탐색구간을 이용한 시차추정 알고리즘)

  • Koh Je hyun;Song Hyok;Yoo Ji sang
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.30 no.4C
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    • pp.253-261
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    • 2005
  • In this paper, we propose an efficient block-based disparity estimation algorithm fur multiple view image coding in EE2 and EE3 in 3DAV. The proposed method emphasizes on visual quality improvement to satisfy the requirements for multiple view generation. Therefore, we perform an adaptive disparity estimation that constructs variable blocks by considering given image features. Examining neighboring features around desired block search range is set up to decrease complexity and additional information than only using quad-tree coding through applying binary-tree and quad-tree coding by taking into account stereo image feature having big disparity. The experimental results show that the proposed method improves PSNR about 1 to 2dB compared to existing other methods and decreases computational complexity up to maximum 68 percentages than FBMA.