• Title, Summary, Keyword: Video Compression

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Effective Compression of the Surveillance Video with Region of Interest (관심영역 구분을 통한 감시영상시스템의 효율적 압축)

  • Ko, Mi-Ae;Kim, Young-Mo;Koh, Kwang-Sik
    • The KIPS Transactions:PartB
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    • v.10B no.1
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    • pp.95-102
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    • 2003
  • In surveillance video system, there are many classes of images and some spatial regions are more important than other regions. The conventional compression method in this system have been compressed there full frames without classfying them depend on their important parts. To improve the accuracy of the image coding and deliver effective compression for the surveillance video system, it was necessary to separate the regions according to their importance. In this paper, we propose a new effective surveillance video image compression method. The proposed scheme defines importance based three-level region of interest block in a frame, such as background, motion object block, and the feature object block. A captured video image frame can be separated to these three different levels of block regions. And depends on the priority, each block can be modified and compressed in different resolution, compression ratio and qualify factor. Therefore, in surveillance video system, this algorithm not only reduces the image processing time and space, but also guarantees the Important image data in high quality to acquire the system's goal.

The development of improve the compression ratio through the variance of the luminance component of the intra macroblock (인트라 매크로블록의 휘도성분 분산을 이용한 압축률 향상)

  • Kim, June;Kim, Youngseop
    • Journal of the Semiconductor & Display Technology
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    • v.12 no.1
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    • pp.35-39
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    • 2013
  • H.264/AVC is an authoritative international video coding standard which shows code and efficiency more improved than the existing video standards. Above all, the parameter block mode of H.264/AVC significantly contributes much to high compression efficiency. However, as the occasion demands, users tend to pass while overlooking the part that can produce a little higher compression efficiency. We, taking notice of this point, are designed to bring in much higher compression efficiency by gathering up the overlooked parts. This paper suggests the algorithm that produces efficient performance improvement by using the histogram of luminance in the pixel unit (Macroblock) of respective prediction block and applying specific thresholds. The experimental results proves that the technique proposed by this paper increases the compression efficiency of the existing H.264/AVC algorithm by 0.4% without any increase in the whole encoding time and PSNR complexity.

Sub-pixel Motion Estimation Algorithm with Low Computation Complexity for H.264 Video Compression (H.264 동영상 압축을 위한 낮은 복잡도를 갖는 부 화소 단위에서의 움직임 추정)

  • Lee, Yun-Hwa;Shin, Hyun-Chul
    • Proceedings of the IEEK Conference
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    • pp.639-642
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    • 2005
  • Motion Estimation(ME) is an important part of video compression, because it requires a large amount of computation. Half-pixel and quarter-pixel motion estimation allows high video compression rates but it also has high computation complexity. In this paper we suggest a new and efficient motion estimation algorithm for half-pixel and quarter-pixel motion estimation using SAD values. In the method, an integer-pixel motion vector is found and then only three neighboring points of the integer-pixel motion vector is evaluated to find the half-pixel motion vector. The quarter-pixel motion vector is also found by using a similar method. Experimental results of our method shows 20% reduction in computation time, when compared with those of a conventional method, while producing same quality motion vectors.

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New Texture Prediction for Multi-view Video Coding

  • Park, Ji-Ho;Kim, Yong-Hwan;Choi, Byeong-Ho
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.1508-1511
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    • 2007
  • This paper introduces a new texture prediction for MVC( Multi-view Video Coding) which is currently being developed as an extension of the ITU-T Recommendation H.264 | ISO/IEC International Standard ISO/IEC 14496-10 AVC (Advanced Video Coding) [1]. The MVC's prcimary target is 3D video compression for 3D display system, thus, key technology compared to 2D video compression is reducing inter-view correlation. It is noticed, however, that the current JMVM [2] does not effectively eliminate inter-view correlation so that there is still a room to improve coding efficiency. The proposed method utilizes similarity of interview residual signal and can provide an additional coding gain. It is claimed that up to 0.2dB PSNR gain with 1.4% bit-rate saving is obtained for three multi-view test sequences.

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A Study on the Extraction of the dynamic objects using temporal continuity and motion in the Video (비디오에서 객체의 시공간적 연속성과 움직임을 이용한 동적 객체추출에 관한 연구)

  • Park, Changmin
    • Journal of the Korea Society of Digital Industry and Information Management
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    • v.12 no.4
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    • pp.115-121
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    • 2016
  • Recently, it has become an important problem to extract semantic objects from videos, which are useful for improving the performance of video compression and video retrieval. In this thesis, an automatic extraction method of moving objects of interest in video is suggested. We define that an moving object of interest should be relatively large in a frame image and should occur frequently in a scene. The moving object of interest should have different motion from camera motion. Moving object of interest are determined through spatial continuity by the AMOS method and moving histogram. Through experiments with diverse scenes, we found that the proposed method extracted almost all of the objects of interest selected by the user but its precision was 69% because of over-extraction.

Study on the Quality of User Experience Considering the Video Contents Characteristics (영상 콘텐츠 특성을 고려한 영상 서비스의 사용자 체감 품질 변화에 대한 연구)

  • Kim, Beom-Joon
    • The Journal of the Korea institute of electronic communication sciences
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    • v.13 no.2
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    • pp.427-434
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    • 2018
  • Video services have been widely generalized thanks to the progress in compression streaming technologies. In spite of the innate difficulties in guaranteeing quality of service(QoS) of the Internet, the quality of service that is experienced by users have been improved considerably with overall bandwidth growth over the Internet and new compression and streaming technologies. For further sophisticated management scheme from the current homogeneous one, it should consider the characteristics of video contents. This paper investigates that the Quality of Experience(: QoE) for video services can vary according to the characteristics of video contents for the same compression method and transmission environments. It is expected that this result contributes to establish a new and advanced scheme to manage QoE for video services over the Internet.

Caption Data Transmission Method for HDTV Picture Quality Improvement (DTV 화질향상을 위한 자막데이터 전송방법)

  • Han, Chan-Ho
    • Journal of Korea Multimedia Society
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    • v.20 no.10
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    • pp.1628-1636
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    • 2017
  • Such as closed caption, ancillary data, electronic program guide(EPG), data broadcasting, and etc, increased data for service convenience cause to degrade video quality of high definition contents. This article propose a method to transfer the closed caption data of video contents without video quality degradation. Video quality degradation does not cause in video compression by the block image insertion of caption data in DTV essential hidden area. Additionally the proposed methods have advantage to synchronize video, audio, and caption from preinserted script without time delay.

A Study on the Development of Web-based Full Motion Video E-mail System using MPEG-4 (웹을 기반으로 한 MPEG-4 동영상 E-mail 시스템의 개발)

  • 고재승
    • Journal of the Korea Computer Industry Society
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    • v.3 no.3
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    • pp.283-294
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    • 2002
  • Now is the time for web-based video e-mail system because of world wide use of internet. But video data is so large, then data compression is much needed for transmission by web. In this paper, my colleagues and I implement full motion video e-mail system using MPEG-4, the international standards for audio-visual data. This video e-mail system is made of web-based active-X control, so easily accessible by web, and applies real-time audio-video compression. It's possible for everyone to send video e-mail for free to everywhere in the world if this system is used. The main application areas of this system are multimedia mailing service, web-based video advertisement, remote education, remote medical service and shopping mall construction, etc.

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Design of CAVLC Decoder for H.264/AVC (H.264/AVC용 CAVLC 디코더의 설계)

  • Jung, Duck-Young;Sonh, Seung-Il
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.11 no.6
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    • pp.1104-1114
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    • 2007
  • Digital video compression technique has played an important role that enables efficient transmission and storage of multimedia data where bandwidth and storage space are limited. The new video coding standard, H.264/AVC, developed by Joint Video Team(JVT) significantly outperforms previous standards in compression performance. Especially, variable length code(VLC) plays a crucial pun in video and image compression applications. H.264/AVC standard adopted Context-based Adaptive Variable Length Coding(CAVLC) as the entropy coding method. CAVLC of H.264/AVC requires a large number of the memory accesses. This is a serious problem for applications such as DMB and video phone service because of the considerable amount of power that is consumed in accessing the memory. In order to overcome this problem in this paper, we propose a variable length technique that implements memory-free coeff_token, level, and run_before decoding based on arithmetic operations and using only 70% of the required memory at total_zero variable length decoding.

A Resolution-Scalable Data Compression Method of a Digital Hologram (디지털 홀로그램의 해상도-스케일러블 데이터 압축 방법)

  • Kim, Yoonjoo;Seo, Young-Ho;Kim, Dong-Wook
    • Journal of Broadcast Engineering
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    • v.19 no.2
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    • pp.174-183
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    • 2014
  • This paper is to propose a scalable video coding scheme for adaptive digital hologram video service for various reconstruction environments. It uses both the light source information and digital hologram at both the sending side and the receiving side. It is a resolution-scalable coding method that scales the resolution, that is, the size of the reconstructed image. The method compresses the residual data for both the digital hologram and the light source information. For the digital hologram, a lossy compression method is used, while for the light source information, a lossless compression method is used. The experimental results showed that the proposed method is superior to the existing method in the image quality at the same compression ratio. Especially it showed better performance than the existing method as the compression ratio becomes higher.