• Title/Summary/Keyword: Spatial Audio

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A Study on Adaptive Information Hiding Technique for Copyright Protection of Digital Images (디지털 영상물의 저작권 보호를 위한 적응적 정보 은닉 기술에 관한 연구)

  • Park, Kang-Seo;Chung, Tae-Yun;Oh, Sang-Rok;Park, Sang-Hee
    • Proceedings of the KIEE Conference
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    • 1998.07g
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    • pp.2427-2429
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    • 1998
  • Digital watermarking is the techinque which embeds the invisible signal into multimedia data such as audio, video, images, for copyright protection, including owner identification and copy control information. This paper proposes a new watermark embedding and extraction technique by extending the direct sequence spread spectrum technique. The proposed technique approximates the frequency component of pixels in spatial domain by using Laplacian mask and adaptively embeds the watermark considering the HVS to reduce the degradation of Image. In watermark extraction process, the proposed technique strengthens the high frequency components of image and extracts the watermark by demodulation. All this processes are performed in spatial domain to reduce the processing time.

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Improved Synthesis Method of Negative Inter-channel Correlation Parameter Based on Anti-phase Primary Component (반위상 주요성분에 기반을 둔 개선된 음수 채널간 상관도 파라미터 합성 기법)

  • Hyun, Dong-Il;Lee, Seok-Pil;Park, Young-Cheol;Youn, Dae-Hee
    • The Journal of the Acoustical Society of Korea
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    • v.31 no.6
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    • pp.410-418
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    • 2012
  • Parametric stereo(PS) and MPEG surround(MPS) are major spatial audio coding(SAC) tools. In this paper, the problem of the inter-channel correlation(ICC) synthesis in the conventional SAC is analyzed. Conventional methods assume that ambient components mixed to two output channels are anti-phased, while the primary components are assumed to be in-phased. This assumption can cause excessive ambient mixing for a negative-valued ICC. As a remedy to this problem, we propose a new ICC synthesis method based on an assumption that the primary components are anti-phased each other for a negative ICC. The proposed method is also applied to the approximation which works in practice. The performance of the proposed method was evaluated by computer simulations and the subjective listening tests verified that the proposed method is effective in not only headphones but also loudspeakers playback.

Quality Improvement of Karaoke Mode in SAOC using Cross Prediction based Vocal Estimation Method (교차 예측 기반의 보컬 추정 방법을 이용한 SAOC Karaoke 모드에서의 음질 향상 기법에 대한 연구)

  • Lee, Tung Chin;Park, Young-Cheol;Youn, Dae Hee
    • The Journal of the Acoustical Society of Korea
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    • v.32 no.3
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    • pp.227-236
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    • 2013
  • In this paper, we present a vocal suppression algorithm that can enhance the quality of music signal coded using Spatial Audio Object Coding (SAOC) in Karaoke mode. The residual vocal component in the coded music signal is estimated by using a cross prediction method in which the music signal coded in Karaoke mode is used as the primary input and the vocal signal coded in Solo mode is used as a reference. However, the signals are extracted from the same downmix signal and highly correlated, so that the music signal can be severely damaged by the cross prediction. To prevent this, a psycho-acoustic disturbance rule is proposed, in which the level of disturbance to the reference input of the cross prediction filter is adapted according to the auditory masking property. Objective and subjective test were performed and the results confirm that the proposed algorithm offers improved quality.

A Study on Utilization Plans of TV Programs Related to Environmental Issues as an Environmental Education Material in (중등학교 환경교육에서의 환경관련 TV 프로그램 활용 방안에 관한 연구)

  • Lee, Mu-Choon;Kim, Kyung-Mi
    • Hwankyungkyoyuk
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    • v.19 no.3
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    • pp.165-182
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    • 2006
  • Demands for developing diverse teaching methods and materials which can lead to active participation of students in classes have been emerged for environmental education in secondary schools. In order for more effective environmental education, a variety of programs in the mass media including public broadcasting have been used. Advantages associated with the broadcasted TV programs include compensation of temporal and spatial limits embedded with the printing media, improvement of studying efficiency, and provision of diverse studying opportunities, leading to the promotion of the awareness of environmental issues. In this study, 256 environmental issues related TV programs being aired via major public broadcasting companies such as EBS, KBS, MBC and SBS between years of 2003 and 2004 were analyzed. During the present research, selection of the programs was made based on the weight of the environmental issues in independent programs being aired for at least 10 minutes. A survey as a primary means was carried out for the utilization of the audio-visual educational materials in order to provide a new method employing the TV programs which were related to the environmental issues during the instruction in secondary schools.

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A Study on the Map Service Structure for the T-DMB (Terrestrial-Digital Multimedia Broadcasting) Using Data Carousel (데이터 캐로절을 이용한 지상파 DMB 지도서비스 구성방안에 관한 연구)

  • Kim, Jung-Ok;Ga, Chill-O;Yu, Ki-Yun;Kim, Yong-Il
    • Spatial Information Research
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    • v.15 no.1
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    • pp.15-23
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    • 2007
  • Recently, Korea became the first country which started Terrestrial-DMB service. The DMB service is still at a very early stage throughout the world. At this stage, it is an important issue to develop DMB contents which distinguish DMB from traditional broadcasting by utilizing DMB's mobility. In this paper, we will propose outline of map service through DMB along with related services such as traffic and location information. This outline includes the map service protocol and map data structure for DMB. There is little research at the moment related to it, and this preliminary research enables map service through DMB. A map service would bring DMB a distinct advantage over traditional broadcasting. Moreover, further services based on broadcasting network and mobility would contribute to rapid growth of DMB.

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Story-based Information Retrieval (스토리 기반의 정보 검색 연구)

  • You, Eun-Soon;Park, Seung-Bo
    • Journal of Intelligence and Information Systems
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    • v.19 no.4
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    • pp.81-96
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    • 2013
  • Video information retrieval has become a very important issue because of the explosive increase in video data from Web content development. Meanwhile, content-based video analysis using visual features has been the main source for video information retrieval and browsing. Content in video can be represented with content-based analysis techniques, which can extract various features from audio-visual data such as frames, shots, colors, texture, or shape. Moreover, similarity between videos can be measured through content-based analysis. However, a movie that is one of typical types of video data is organized by story as well as audio-visual data. This causes a semantic gap between significant information recognized by people and information resulting from content-based analysis, when content-based video analysis using only audio-visual data of low level is applied to information retrieval of movie. The reason for this semantic gap is that the story line for a movie is high level information, with relationships in the content that changes as the movie progresses. Information retrieval related to the story line of a movie cannot be executed by only content-based analysis techniques. A formal model is needed, which can determine relationships among movie contents, or track meaning changes, in order to accurately retrieve the story information. Recently, story-based video analysis techniques have emerged using a social network concept for story information retrieval. These approaches represent a story by using the relationships between characters in a movie, but these approaches have problems. First, they do not express dynamic changes in relationships between characters according to story development. Second, they miss profound information, such as emotions indicating the identities and psychological states of the characters. Emotion is essential to understanding a character's motivation, conflict, and resolution. Third, they do not take account of events and background that contribute to the story. As a result, this paper reviews the importance and weaknesses of previous video analysis methods ranging from content-based approaches to story analysis based on social network. Also, we suggest necessary elements, such as character, background, and events, based on narrative structures introduced in the literature. We extract characters' emotional words from the script of the movie Pretty Woman by using the hierarchical attribute of WordNet, which is an extensive English thesaurus. WordNet offers relationships between words (e.g., synonyms, hypernyms, hyponyms, antonyms). We present a method to visualize the emotional pattern of a character over time. Second, a character's inner nature must be predetermined in order to model a character arc that can depict the character's growth and development. To this end, we analyze the amount of the character's dialogue in the script and track the character's inner nature using social network concepts, such as in-degree (incoming links) and out-degree (outgoing links). Additionally, we propose a method that can track a character's inner nature by tracing indices such as degree, in-degree, and out-degree of the character network in a movie through its progression. Finally, the spatial background where characters meet and where events take place is an important element in the story. We take advantage of the movie script to extracting significant spatial background and suggest a scene map describing spatial arrangements and distances in the movie. Important places where main characters first meet or where they stay during long periods of time can be extracted through this scene map. In view of the aforementioned three elements (character, event, background), we extract a variety of information related to the story and evaluate the performance of the proposed method. We can track story information extracted over time and detect a change in the character's emotion or inner nature, spatial movement, and conflicts and resolutions in the story.

Objective measurement of spatial auditory quality for multi channel audio codecs (멀티채널 오디오 압축 코덱 음질의 객관적인 측정방법)

  • Choi, In-Yong;Chon, Sang-Bae;Sung, Koeng-Mo
    • Proceedings of the IEEK Conference
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    • 2005.11a
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    • pp.431-434
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    • 2005
  • 본 논문은 멀티채널 오디오 압축 코덱의 음질을 객관적으로 평가할 수 있는 시스템 및 파라메터에 관한 것으로, 멀티채널 오디오 신호로부터 양이입력신호(ear input signals)를 만들어내는 전처리 과정과 이 과정을 통해 출력되는 양이입력신호로부터 양이레벨차이왜곡(inter-aural level difference distortion)을 구하는 과정 및 양이레벨차이왜곡이 청취평가 결과와 일관적인 상관관계를 보임을 서술한다. 본 연구에 의하면 멀티채널 오디오 압축 코덱의 음질을 선별된 청취자에 의한 주관적인 평가와 통계처리 없이 객관적인 측정만을 통해 평가하는 것이 가능하며, 이를 사용하면 멀티채널 오디오 압축 코덱 개발자들이 시간, 경제적 부담 없이 자신이 개발한 압축 코덱의 음질을 간단하게 평가해볼 수 있다.

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An Expansion of Sound Image Using Phase Shifting of Low Frequency and Reflected Sound of High Frequency in Television (저역 위상 처리와 고역 반사음을 이용한 텔레비전에서의 음상 확장)

  • 김동수;박해광
    • Proceedings of the IEEK Conference
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    • 1998.10a
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    • pp.1235-1238
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    • 1998
  • In television stereo system, to produce the sound image for spatial impression is too difficult because of the narrow distence between two speakers. A method of widening the sound image using precedence effect was introduced but it didn't work effectively in low frequency band. In this paper, we propose a new method to produce an expanded sound image in full band of audio requency in band sound is expanded by phase shifting method and a higher frequency band sound is expanded by reflection. In simulation and experiment, the proposed system guarantees useful effect of sound image expansion in television stereo system.

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A Study on Center Speaker in Television Receiver with Sound Image Expansion (음상 확장 기능을 갖는 텔레비전 수상기에서 센터 스피커에 관한 연구)

  • 이상훈;김동수
    • Proceedings of the IEEK Conference
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    • 1998.10a
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    • pp.1231-1234
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    • 1998
  • Many signal processing methods of widening the sound image for spatial impression have been studied. Most typical methods of widening the sound image are related to the phase shifting and precedence effect. However, these methods are not effective in center sound image. As listener's position moves from center to outside, the center sound image is shifted to the speaker. That is to say, the directional localization of center sound image is unstable. In this paper, we propose a television audio system including center speaker, and analyze the role of center speaker using theory of Makida and precedence effect. In experiments, we confirm the usefulness of the center speaker for the stability of center sound image.

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Design and Implementation of A Video Information Management System for Digital Libraries (디지털 도서관을 위한 동영상 정보 관리 시스템의 설계 및 구현)

  • 김현주;권재길;정재희;김인홍;강현석;배종민
    • Journal of Korea Multimedia Society
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    • v.1 no.2
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    • pp.131-141
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    • 1998
  • Video data occurred in multimedia documents consist of a large scale of irregular data including audio-visual, spatial-temporal, and semantic information. In general, it is difficult to grasp the exact meaning of such a video information because video data apparently consist of unmeaningful symbols and numerics. In order to relieve these difficulties, it is necessary to develop an integrated manager for complex structures of video data and provide users of video digital libraries with easy, systematic access mechanisms to video informations. This paper proposes a generic integrated video information model(GIVIM) based on an extended Dublin Core metadata system to effectively store and retrieve video documents in digital libraries. The GIVIM is an integrated mo이 of a video metadata model(VMN) and a video architecture information model(VAIM). We also present design and implementation results of a video document management system(VDMS) based on the GIVIM.

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