• Title/Summary/Keyword: Anchor picture

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A Fast Mode Decision of Non-anchor Pictures in Multi-view Video Coding for 3D Applications (3D 응용을 위한 다시점 영상 부호화에서 비기준 화면의 빠른 모드결정 기법)

  • Jung, Choong-Hyun;Shin, Kwang-Mu;Park, Seong-Ho;Chung, Ki-Dong
    • Journal of Korea Multimedia Society
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    • v.15 no.7
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    • pp.859-869
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    • 2012
  • The Multi-view Video Coding (MVC) which is exploiting disparities between views has been developed to improve the coding efficiency of multi-view video. But MVC has a problem of having high computing complexities because of disparity estimation. This paper propose a fast mode decision for non-anchor picture to reduce the computational time of MVC. The proposed method uses two phases. Anchor pictures in hierarchical B picture structure have a higher correlation with prediction mode selection of non-anchor pictures, so in the first phase, prediction mode of non-anchor pictures is selected by exploiting the macro-block regions in anchor picture. In the second phase, we select a reference direction of inter prediction mode exploiting a higher correlation among reference directions of inter prediction modes of 7 block sizes. Experimental results show that the proposed method could save average about 44% in the encoding time with negligible coding efficiency losses.

A Method for Improving Anchor Picture Quality of Multiview Video Coding Scheme (다시점 비디오 부호화의 기준 영상 화질 향상 방법)

  • Park, Min-Woo;Park, Jong-Tae;Park, Gwang-Hoon
    • Journal of Broadcast Engineering
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    • v.13 no.3
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    • pp.388-400
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    • 2008
  • This paper introduces a cost-effective method fur improving anchor picture quality of a multiview video coding scheme that is mainly based on chroma compensation. Proposed method is applied to both INTER $16{\times}16$ and SKIP modes in only anchor P-pictures. By testing using JVT common test conditions, simulation results show that proposed method can obtain the average BD-PSNR gains fur U and V as 0.136 dB and 0.127 dB, respectively, while maintaining almost same performance for Y (luminance). For the range of low bit-rates, it is observed that average BD-PSNR gains of Y, U, and V are 0.141 dB, 0.494 dB and 0.525 dB, respectively. Necessary computational complexity is very marginal because the number of anchor P-pictures is only 4.18% in comparison with whole coded sequences, however it can be found that the proposed method can significantly improve the coding efficiencies of color components.

Forward rate control of MPEG-2 video based on distortion-rate estimation (왜곡-비트율 추정에 근거한 MPEG-2 비디오의 순방향 비트율 제어)

  • 홍성훈;김성대;최재각;홍성용
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.23 no.8
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    • pp.2010-2024
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    • 1998
  • In video coding, it is important to improve the average picture quality as well as to maintain cosistent picture quality between consecutive pictures. In this paper, we propose a distortion-rate estimation method for MPEG-2 video and a forward rate control method, using the proposed estimation result, to be able to obtain the improved and consistent picture quality of CBR (Constant Bit Rate) encoded MPEG-2 video. The proposed distortion-rate estimation enable us to predict the distortion and the bits generated from an encoded picture at a given quantization step size and vice versa. The most attactive features of proposed distortion-rate estimation are its accuracy and low computational complexity enough to be applied to the practical video coding. In addition, the proposed rate control first determined a quantization parameter per frame by following procedure: distortion-rate estimation, target bit allocation, distortion constraint and VBV(Video Buffer Verification) constraint. And then this quantization parameter is applied to the encoding so that improved and consisten picture quality can be obtained. Furthermore the proposed rate control method can solve the error propagation problem caused by scene change or anchor picture degradation by using the B-picture skipping and the guarantee of the minimum bit allocation for the anchor picture. Experimental results, comparing the proposed forward rate control method with TM5 method, show that the proposed method makes more improed and consistent picture quality than TM5.

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Efficient Detection of Scene Change and Anchorperson Frame in News Video (뉴스 비디오에서의 효율적인 장면 전환과 앵커 화면 검출)

  • Kang, Hyunchul;Lee, Jin-Sung;Lee, Wanjoo
    • Journal of KIISE:Software and Applications
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    • v.32 no.12
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    • pp.1157-1163
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    • 2005
  • In this paper, an efficient and fast method to segment a video in the MPEG(motion picture expert group) video stream is proposed. For the real time processing of large amount of broadcasting data, we use DC images of I-frames in an MPEG compressed video with minimal decoding. Using the modified histogram comparison which counts on not only luminance but also chrominance information, the scene change detection was performed in the fast and accurate way Also, to discriminate anchorperson frame from non-anchor frame, a neural network method was introduced.

Type of Classification Criterion and Characteristic of Classification Strategy That Appear in Pre-Service Elementary Teachers' Classification Activity (예비 초등 교사들의 분류 활동에서 나타난 분류 기준의 유형과 분류 전략의 특징)

  • Yang, Il-Ho;Choi, Hyun-Dong
    • Journal of Korean Elementary Science Education
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    • v.27 no.1
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    • pp.9-22
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    • 2008
  • The purpose of this study was to investigate the type of classification criterion and the characteristic of classification strategy that appear in pre-service elementary teachers' classification activity. The 4 tasks were developed for classification activity; button as a real things that attribute is prominent, shell as a real things that attribute is less prominent, snow flake as a picture cards that attribute is prominent, and galaxy as a picture cards that attribute is less prominent. The 5 college students who major in elementary education were selected. Data were collected by interview with participants, participants' classification recording paper, investigator's observation of participants' action observation, and videotaped that record participants' subject classification process. Result proved in this study is as following. First, pre-service elementary teachers used 4 qualitative classification criterion of feature, random field, image and secondary property, and used 2 dimension classification criterion of space and quantity. They used single quality classification criterion or combining dimension classification criterion in classification activity. Second, pre-service elementary teachers have classification strategy that apply each various classification criterion, and also classification strategy are different according to subject, but discussed that "anchor" and "priming effect" are important for effective classification. Result of this study is expected to contribute classification research and classification teaching program development.

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A Feature Map Compression Method for Multi-resolution Feature Map with PCA-based Transformation (PCA 기반 변환을 통한 다해상도 피처 맵 압축 방법)

  • Park, Seungjin;Lee, Minhun;Choi, Hansol;Kim, Minsub;Oh, Seoung-Jun;Kim, Younhee;Do, Jihoon;Jeong, Se Yoon;Sim, Donggyu
    • Journal of Broadcast Engineering
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    • v.27 no.1
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    • pp.56-68
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    • 2022
  • In this paper, we propose a compression method for multi-resolution feature maps for VCM. The proposed compression method removes the redundancy between the channels and resolution levels of the multi-resolution feature map through PCA-based transformation. According to each characteristic, the basis vectors and mean vector used for transformation, and the transformation coefficient obtained through the transformation are compressed using a VVC-based coder and DeepCABAC. In order to evaluate performance of the proposed method, the object detection performance was measured for the OpenImageV6 and COCO 2017 validation set, and the BD-rate of MPEG-VCM anchor and feature map compression anchor proposed in this paper was compared using bpp and mAP. As a result of the experiment, the proposed method shows a 25.71% BD-rate performance improvement compared to feature map compression anchor in OpenImageV6. Furthermore, for large objects of the COCO 2017 validation set, the BD-rate performance is improved by up to 43.72% compared to the MPEG-VCM anchor.

Case study of Lighting method to improve TV news viewers' attention span -Based on KBS News 9 Lighting Method Analysis- (TV뉴스 시청자의 집중도 향상을 위한 조명 기법의 사례 연구 -KBS 9시 뉴스 조명 기법 분석을 중심으로-)

  • Han, Hak-Soo
    • Journal of the Korea Society of Computer and Information
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    • v.14 no.12
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    • pp.97-107
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    • 2009
  • Television News has significant impact on the information analysis of viewers by delivering world news to anonymous individuals everyday. We need to pay more attention to resolution considering the fact that even slight facial expression and the dress of TV anchor can be noticed by viewers in the high definition age, called HD TV, by radical changes in broadcasting situation. As a result, the beauty of expression that lighting technology has is extremely important in the high definition age. In news broadcast, as a phenomenon according to this change in trend, people have been looking for change in order to break with traditional TV news production by adopting DLP(Digital Lighting Processing) or LED(Light Emitting Diode). This effort has contributed to creating proper picture quality appropriate for HD TV. Nowadays Digital imaging is creating new trend in TV news production method from traditional analog-based lighting environment thanks to the development of IT(Information Technology) and digitalized lighting equipment. This change has led to building of HD studio and appropriate sets and lighting system. There are film set and projector which projects image on the screen and PDP, LCD, and DLP which has been used widely in recent years and LED which is often used as background in news program as examples, which has appeared since 1990s with HD TV. In this article, I analyzed the KBS News 9 lnce 1990s with in order to research the influence of television image component on the alyzed the KBS of TV article, I. I wille uggest the category of TV anchor image formulation in delivering information by means of lnce 1990s with based on the analysis result.

Analysis of Feature Map Compression Efficiency and Machine Task Performance According to Feature Frame Configuration Method (피처 프레임 구성 방안에 따른 피처 맵 압축 효율 및 머신 태스크 성능 분석)

  • Rhee, Seongbae;Lee, Minseok;Kim, Kyuheon
    • Journal of Broadcast Engineering
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    • v.27 no.3
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    • pp.318-331
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    • 2022
  • With the recent development of hardware computing devices and software based frameworks, machine tasks using deep learning networks are expected to be utilized in various industrial fields and personal IoT devices. However, in order to overcome the limitations of high cost device for utilizing the deep learning network and that the user may not receive the results requested when only the machine task results are transmitted from the server, Collaborative Intelligence (CI) proposed the transmission of feature maps as a solution. In this paper, an efficient compression method for feature maps with vast data sizes to support the CI paradigm was analyzed and presented through experiments. This method increases redundancy by applying feature map reordering to improve compression efficiency in traditional video codecs, and proposes a feature map method that improves compression efficiency and maintains the performance of machine tasks by simultaneously utilizing image compression format and video compression format. As a result of the experiment, the proposed method shows 14.29% gain in BD-rate of BPP and mAP compared to the feature compression anchor of MPEG-VCM.