• Title, Summary, Keyword: Video Compression

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Digital Hologram Compression Technique By Hybrid Video Coding (하이브리드 비디오 코팅에 의한 디지털 홀로그램 압축기술)

  • Seo, Young-Ho;Choi, Hyun-Jun;Kang, Hoon-Jong;Lee, Seung-Hyun;Kim, Dong-Wook
    • Journal of the Institute of Electronics Engineers of Korea SP
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    • v.42 no.5
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    • pp.29-40
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    • 2005
  • According as base of digital hologram has been magnified, discussion of compression technology is expected as a international standard which defines the compression technique of 3D image and video has been progressed in form of 3DAV which is a part of MPEG. As we can identify in case of 3DAV, the coding technique has high possibility to be formed into the hybrid type which is a merged, refined, or mixid with the various previous technique. Therefore, we wish to present the relationship between various image/video coding techniques and digital hologram In this paper, we propose an efficient coding method of digital hologram using standard compression tools for video and image. At first, we convert fringe patterns into video data using a principle of CGH(Computer Generated Hologram), and then encode it. In this research, we propose a compression algorithm is made up of various method such as pre-processing for transform, local segmentation with global information of object image, frequency transform for coding, scanning to make fringe to video stream, classification of coefficients, and hybrid video coding. Finally the proposed hybrid compression algorithm is all of these methods. The tool for still image coding is JPEG2000, and the toots for video coding include various international compression algorithm such as MPEG-2, MPEG-4, and H.264 and various lossless compression algorithm. The proposed algorithm illustrated that it have better properties for reconstruction than the previous researches on far greater compression rate above from four times to eight times as much. Therefore we expect that the proposed technique for digital hologram coding is to be a good preceding research.

Hologram Compression Technique using Motion Compensated Temporal Filtering (움직임보상 시간적 필터링을 이용한 홀로그램 압축 기법)

  • Seo, Young-Ho;Choi, Hyun-Jun;Kim, Dong-Wook
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.34 no.11B
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    • pp.1296-1302
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    • 2009
  • We propose an efficient coding method of digital holograms using MCTF and standard compression tools for video. The hologram is generated by a computer-generated hologram (CGH) algorithm with both an object image and its depth information. The proposed coding consists of localization by segmenting a hologram, frequency transform using $64\times64$ segment size, 2-D discrete cosine transform DCT for extracting redundancy, motion compensated temporal filtering (MCTF), segment scanning the segmented hologram to form a video sequence, and video coding, which uses H.264/AVC. The proposed algorithm illustrates that it has better properties for reconstruction, 10% higher compression rate than previous research in case of object.

A Thumbnail Extraction Algorithm for DMB (DMB를 위한 요약영상 추출 알고리듬)

  • Kwon, Yong-Kwang;Won, Chee-Sun
    • Journal of Broadcast Engineering
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    • v.12 no.5
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    • pp.525-534
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    • 2007
  • H.264/AVC for DMB is the most advanced video compression standard which provides a high compression rate and a video quality by adopting new technologies. However, these new technologies prevent us from applying some conventional algorithms directly to the H.264/AVC compression domain. For example, we need to study new image resizing schemes in the compressed bit-stream. So, in this paper, we propose a new thumbnail extraction method which can be applied to H.264. The proposed method shows that it can extract a 1/16 size thumbnail video, saving the operation time up to 50% to 70%.

Effective Compression Technique of Multi-view Image expressed by Layered Depth Image (계층적 깊이 영상으로 표현된 다시점 영상의 효과적인 압축 기술)

  • Jee, Inn-Ho
    • The Journal of The Institute of Internet, Broadcasting and Communication
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    • v.14 no.4
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    • pp.29-37
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    • 2014
  • Since multi-view video exists a number of camera color image and depth image, it has a huge of data. Thus, a new compression technique is indispensable for reducing this data. Recently, the effective compression encoding technique for multi-view video that used in layered depth image concepts is a remarkable. This method uses several view point of depth information and warping function, synthesizes multi-view color and depth image, becomes one data structure. In this paper we use actual distance for solving overlap in layered depth image that reduce required data for reconstructing in color-based transform. In experimental results, we confirmed high compression performance and good quality of reconstructed image.

Video Subband Coding using Quad-Tree Algorithm (쿼드트리 알고리즘을 이용한 비디오 서브밴드 코딩)

  • An, Chong-Koo;Chu, Hyung-Suk
    • Journal of the Institute of Convergence Signal Processing
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    • v.6 no.3
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    • pp.120-126
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    • 2005
  • This paper presents the 3D wavelet based video compression system using quad-tree algorithm. The 3D wavelet 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 transform. The proposed system allocates the higher bit rate to the low frequency image of the 3D wavelet sequences and improves the 0.64dB 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 transform, the proposed system progressively transmits the input sequence according to the resolution and rate scalability.

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Video Compression Method Using SURF Feature and Block Shaping (SURF 특징과 블록 모양을 이용한 동영상 압축 방법)

  • Jun, Jae-Hyun;Kim, Min-Jun;Jang, Yong-Suk;Ahn, Cheol-Woong;Kim, Sung-Ho
    • The Journal of The Institute of Internet, Broadcasting and Communication
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    • v.15 no.4
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    • pp.161-167
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    • 2015
  • Today, computer network infrastructure is commonplace and internet user increase. Transmission bandwidth for network traffic is increasing. The data amount of 2014 and 2015 year measured 47 and 62 exabyte, it shows a tremendous increase. Video traffic occupy 60 percent among internet traffic. Enormous growth of Internet traffic than the network infrastructure is not enough to support them, so mobile network occur side-effects such as fall of voice communication. In this paper, we proposed the video compression method using SURF feature and block shaping in order to avoid potential damage. Our proposed method can provide enough performance than previous method.

A Bus Data Compression Method for High Resolution Mobile Multimedia SoC (고해상 모바일 멀티미디어 SoC를 위한 온칩 버스 데이터 압축 방법)

  • Lee, Jin;Lee, Jaesung
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.345-348
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    • 2013
  • This paper provides a method for compression and transmission of on-chip bus data. As the data traffic on on-chip buses is rapidly increasing with enlarged video resolutions, many video processor chips suffer from a lack of bus bandwidth and their IP cores have to wait for a longer time to get a bus grant. In multimedia data such as images and video, the adjacent data signals very often have little or no difference between them. Taking advantage of this point, this paper develops a simple bus data compression method to improve the chip performance and presents its hardware implementation. The method is applied to a Video Codec - 1 (VC-1) decoder chip and reduces the processing time of one macro-block by 13.6% and 10.3% for SD and HD videos, respectively.

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Video Data Compression using the MPEG-2 Video Algorithm (MPEG-2 비디오 알고리즘을 이용한 비디오 데이터 압축)

  • 남재열;이영선;이현주;김재곤;이상미;안치득
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.18 no.8
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    • pp.1069-1082
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    • 1993
  • The International Organization for Standardization(ISO) has undertaken an effort to develop a standard for video and associated audio on digital storage media. This effort is known by the name of the expert group that started if : MPEG-Moving Picture Experts Group Is currently part of the ISO-I EC/J TC1/SC2/WG11. The promise of MPEG-2 is that a video signal and its associated audio can be compressed to a bit rate of about 10 Mbits/s with an acceptable quality. In this paper, the implementation of a video compression simulator based on MPEG-2 Video Test Model 2(TM2) is described and analyzed according to the simulation results. The implemented simulator is also applied to code HDTV sequences at the several bit rates. Some computer simulation results using the MPEG and the HDTV test sequences are given. In addition, some techniques which can improve the coding efficiency of the implemented video compression simulator are also suggested.

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An adaptive frequency-selective weighted prediction of residual signal for efficient RGB video compression coding (능률적 RGB 비디오 압축 부호화를 위한 잔여신호의 적응적 주파수-선택 가중 예측 기법)

  • Jeong, Jin-Woo;Choe, Yoon-Sik;Kim, Yong-Goo
    • Journal of Broadcast Engineering
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    • v.15 no.4
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    • pp.527-539
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    • 2010
  • Most video coding systems use YCbCr color space for their inputs, but RGB space is more preferred in the field of high fidelity video because the compression gain from YCbCr becomes disappeared in the high quality operation region. In order to improve the coding performance of RGB video signal, this paper presents an adaptive frequency-selective weighted prediction algorithm. Based on the sign agreement and the strength of frequency-domain correlation of residual color planes, the proposed scheme adaptively selects the frequency elements as well as the corresponding prediction weights for better utilization of inter-plane correlation of RGB signal. Experimental results showed that the proposed algorithm improves the coding gain of around 13% bitrate reduction, on average, compared to the common mode of 4:4:4 video coding in the state-of-the-art video compression standard, H.264/AVC.

Design of Sub-pixel Interpolation Circuit for Real-time Multi-decoder Supporting 4K-UHD Video Images (4K-UHD 영상을 지원하는 실시간 통합 복호기용 부화소 보간 회로 설계)

  • Lee, Sujung;Cho, Kyeongsoon
    • Journal of IKEEE
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    • v.19 no.1
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    • pp.1-9
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    • 2015
  • This paper proposes the design of sub-pixel interpolation circuit for real-time multi-decoder supporting 4K-UHD video images. The proposed sub-pixel interpolation circuit supports H.264, MPEG-4, VC-1 and new video compression standard HEVC. The common part of the interpolation algorithm used in each video compression standard is shared to reduce the circuit size. An intermediate buffer is effectively used to reduce the circuit size and optimize the performance. The proposed sub-pixel interpolation circuit was synthesised by using 130nm standard cell library. The synthesized gate-level circuit consists of 122,564 gates and processes 35~86 image frames per second for 4K-UHD video at the maximum operation frequency of 200MHz. Therefore, the proposed circuit can process 4K-UHD video in real time.