• Title, Summary, Keyword: Video Compression

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A Study on a Compensation of Decoded Video Quality and an Enhancement of Encoding Speed

  • Sir, Jaechul;Yoon, Sungkyu;Lim, Younghwan
    • Journal of The Korea Computer Graphics Society
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    • v.6 no.3
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    • pp.35-40
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    • 2000
  • There are two problems in H.26X compression technique. One is compressing time in encoding process and the other is degradation of the decoded video quality due to high compression rate. For transferring moving pictures in real-time, it is required to adopt massively high compression. In this case, there are a lot of losses of an original video data and that results in degradation of quality. Especially degradation called by blocking artifact may be produced. The blocking artifact effect is produced by DCT-based coding techniques because they operate without considering correlation between pixels in block boundaries. So it represents discontinuity between adjacent blocks. This paper describes methods of quality compensation for H.26x decoded data and enhancing encoding speed for real-time operation. Our goal of the quality compensation is not to make the decoded video identical to a original video but to make it perceived better through human eyes. We suggest an algorithm that reduces block artifact and clears decoded video in decoder. To enhance encoding speed, we adopt new four-step search algorithm. As shown in the experimental result, the quality compensation provides better video quality because of reducing blocking artifact. And then new four-step search algorithm with $MMX^{TM}$ implementation improves encoding speed from 2.5 fps to 17 fps.

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The Motion-Based Video Segmentation for Low Bit Rate Transmission (저비트율 동영상 전송을 위한 움직임 기반 동영상 분할)

  • Lee, Beom-Ro;Jeong, Jin-Hyeon
    • The Transactions of the Korea Information Processing Society
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    • v.6 no.10
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    • pp.2838-2844
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    • 1999
  • The motion-based video segmentation provides a powerful method of video compression, because it defines a region with similar motion, and it makes video compression system to more efficiently describe motion video. In this paper, we propose the Modified Fuzzy Competitive Learning Algorithm (MFCLA) to improve the traditional K-menas clustering algorithm to implement the motion-based video segmentation efficiently. The segmented region is described with the affine model, which consists of only six parameters. This affine model was calculated with optical flow, describing the movements of pixels by frames. This method could be applied in the low bit rate video transmission, such as video conferencing system.

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Compressed Representation of Neural Networks for Use Cases of Video/Image Compression in MPEG-NNR

  • Moon, Hyeoncheol;Kim, Jae-Gon
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • pp.133-134
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    • 2018
  • MPEG-NNR (Compressed Representation of Neural Networks) aims to define a compressed and interoperable representation of trained neural networks. In this paper, a compressed representation of NN and its evaluation performance along with use cases of image/video compression in MPEG-NNR are presented. In the compression of NN, a CNN to replace the in-loop filter in VVC (Versatile Video Coding) intra coding is compressed by applying uniform quantization to reduce the trained weights, and the compressed CNN is evaluated in terms of compression ratio and coding efficiency compared to the original CNN. Evaluation results show that CNN could be compressed to about quarter with negligible coding loss by applying simple quantization to the trained weights.

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WARPED DISCRETE COSINE TRANSFORM EXTENSION TO THE H.264/AVC

  • Lee, Sang-Heon;Cho, Nam-Ik
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • pp.326-329
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    • 2009
  • This paper proposes a new video compression algorithm using an adaptive transform that is adjusted depending on the frequency contents of the input signals. The adaptive transform is based on the warped discrete cosine transform (WDCT) which is shown to provide better performance than the DCT at high bit rates, when applied to JPEG compression scheme [1, 2, 3]. The WDCT is applied to the video compression in this paper, as a new feature in the H.264/AVC. The proposed method shows the coding gain over the H.264/AVC at high bit rates. The coding gain is shown over the 35dB PSNR quality, and the gain increases as the bit rate increases. (about 1.0dB at 45dB PSNR quality at maximum)

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Three-Dimensional Subband Coding of Video using Wavelet Packet Algorithm (웨이브릿 패킷 알고리즘을 이용한 3차원 비디오 서브밴드 코딩)

  • Chu, Hyung Suk;An, Chong Koo
    • The Transactions of the Korean Institute of Electrical Engineers D
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    • v.54 no.11
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    • pp.673-679
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    • 2005
  • This Paper presents the 3D wavelet transformation based video compression system, which possesses the capability of progressive transmission by increasing resolution and increasing rate for multimedia applications. The 3D wavelet packet based video compression system removes the temporal correlation of the input sequences using the motion compensation filter and decomposes the spatio-temporal subband using the spatial wavelet packet transformation. The proposed system allocates the higher bit rate to the low frequency image of the 3D wavelet sequences and improves the 0.49dB PSNR performance of the reconstructed image in comparison with that of H.263. In addition to the limitation on the propagation of the motion compensation error by the 3D wavelet transformation, the proposed system progressively transmits the input sequence according to the resolution and rate scalability.

High-Speed Intra Prediction VLSI Implementation for HEVC (HEVC 용 고속 인트라 예측 VLSI 구현)

  • Jo, Hyeonsu;Hong, Youpyo;Jang, Hanbeyoul
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.41 no.11
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    • pp.1502-1506
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    • 2016
  • HEVC (High Efficiency Video Coding) is a recently proposed video compression standard that has a two times greater coding efficiency than previous video compression standards. The key factors of high compression performance and increasement of computational complexity are the various types of block partitions and modes of intra prediction in HEVC. This paper presents an intra prediction hardware architecture for HEVC utilizing pipelining and interleaving techniques to increase the efficiency and performance while reducing the requirement for hardware resources.

Performance Analysis of Future Video Coding (FVC) Standard Technology

  • Choi, Young-Ju;Kim, Ji-Hae;Lee, Jong-Hyeok;Kim, Byung-Gyu
    • Journal of Multimedia Information System
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    • v.4 no.2
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    • pp.73-78
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    • 2017
  • The Future Video Coding (FVC) is a new state of the art video compression standard that is going to standardize, as the next generation of High Efficiency Video Coding (HEVC) standard. The FVC standard applies newly designed block structure, which is called quadtree plus binary tree (QTBT) to improve the coding efficiency. Also, intra and inter prediction parts were changed to improve the coding performance when comparing to the previous coding standard such as HEVC and H.264/AVC. Experimental results shows that we are able to achieve the average BD-rate reduction of 25.46%, 38.00% and 35.78% for Y, U and V, respectively. In terms of complexity, the FVC takes about 14 times longer than the consumed time of HEVC encoder.

SPATIOTEMPORAL MARKER SEARCHING METHOD IN VIDEO STREAM

  • Shimizu, Noriyuki;Miyao, Jun'ichi
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • pp.812-815
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    • 2009
  • This paper discusses a searching method for special markers attached with persons in a surveillance video stream. The marker is a small plate with infrared LEDs, which is called a spatiotemporal marker because it shows a 2-D sequential pattern synchronized with video frames. The search is based on the motion vectors which is the same as one in video compression. The experiments using prototype markers show that the proposed method is practical. Though the method is applicable to a video stream independently, it can decrease total computation cost if motion vector analyses of a video compression and the proposed method is unified.

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An Embedded Video Compression Scheme Using a Three-Dimensional Rate-Distortion Optimization Based Block Coder (3차원 비트율-왜곡 최적화 기반 블록 부호화를 이용하는 임베디드 비디오 압축 방법)

  • Yang, Chang Mo;Chung, Kwangsue
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.41 no.10
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    • pp.1155-1166
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    • 2016
  • In this paper, we propose a new embedded video compression scheme which uses three-dimensional rate-distortion optimization based block coder. After the proposed scheme removes temporal redundancy by applying the motion compensated temporal filtering(MCTF) on input video frames, two dimensional discrete wavelet transform is applied on video frames to remove spatial redundancy. The three-dimensional wavelet coefficients generated in this way are sorted according to their expected rate-distortion slope and encoded by using the three-dimensional block partition coding method. The proposed scheme also uses both the effective color video coding method which maintains embedded features, and the efficient bit-rate control method. Experimental results demonstrate that the proposed scheme not only produces embedded bit-streams, but also outperforms existing video compression schemes.

Multimedia System for Streaming Time-Continuous Screen Images and Audio (시간 연속적인 스크린 이미지와 오디오의 스트리밍을 위한 멀티미디어 시스템)

  • Hwang, Ki-Tae
    • The KIPS Transactions:PartB
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    • v.9B no.2
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    • pp.181-190
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    • 2002
  • This paper proposes a motion-video multimedia system needed for computer applications like remote lecturing, distance learning, product demonstrations, and so on. The applications need a multimedia system which can author and play a motion-Video that is composed with computer screen images and audio continuously varing as time flows, not with real motion videos. Since the computer screen images are not like the real world video images in several rejects, MPEG is not competent as a compression algorithm for computer screen images raring continuously In this paper a new compression algorithm has been proposed, and a multimedia system that authors and plays a motion-video file which contains computer screen images and audio has been implemented. Also this paper shows the result of performance evaluation of both the compression algorithm and the multimedia system implemented in the paper.