ITE Technical Report
Online ISSN : 2424-1970
Print ISSN : 1342-6893
ISSN-L : 1342-6893
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25.78
Displaying 1-15 of 15 articles from this issue
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  • [title in Japanese]
    Article type: Cover
    Pages Cover1-
    Published: November 22, 2001
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.25.78.0_Cover1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • [title in Japanese]
    Article type: Index
    Pages Toc1-
    Published: November 22, 2001
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.25.78.0_Toc1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • A study on the distributions of the DCT coefficients
    Yoshimitsu KUROKI, Yoshifumi UESHIGE
    Article type: Article
    Session ID: BCS2001-47/MIP2001-9
    Published: November 22, 2001
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.25.78.0_1
    CONFERENCE PROCEEDINGS FREE ACCESS
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    This paper presents a new probability density function (pdf), which approximates the distributions of discrete cosine transform (DCT) coefficients. Our discussion is based on the mathematical analysis using a doubly stochastic model reported by Lam and Goodman. In the contrast with their studies, we assume that the variance of the Gaussian distributions can be modeled by the Gamma distributions. The Kolmogorov-Smirnov (KS) test statistic of the proposed pdf for the high-energy AC coefficients is smaller than the Laplacian and Normal distribution, and is slightly larger than the general Gauss statistic.
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  • An efficient encryption method for JPEG2000 image code using layer function
    Katsutoshi ANDO, Osamu WATANABE, Hitoshi KIYA
    Article type: Article
    Session ID: BCS2001-48/MIP2001-9
    Published: November 22, 2001
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.25.78.0_7
    CONFERENCE PROCEEDINGS FREE ACCESS
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    In this report, we propose an encryption method for JPEG2000 image code. With the concept of considering both encryption and image coding, the proposed method encrypts some parts of JPEG2000 image code selectively by exploiting JPEG2000's layer function. In this encryption, an encrypted image code can inherit the original functions of JPEG2000. Furthermore, the computation amount for encryption is lower. Our simulation results demonstrate the effectiveness of the proposed method.
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  • A watermarking scheme allowing desired picture quality for broadcast monitoring
    Takashi TACHIBANA, Masaaki FUJIYOSHI, Hitoshi KIYA
    Article type: Article
    Session ID: BCS2001-49/MIP2001-1
    Published: November 22, 2001
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.25.78.0_15
    CONFERENCE PROCEEDINGS FREE ACCESS
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    This paper proposes a watermarking scheme allowing desired image quality for broadcast monitoring. The proposed scheme generates a watermarked image achieving the desired quality from any image and extracts an embedded watermark without the original image. This scheme can realize high-quality watermarked images as 56 [dB] in the PSNR used at broadcasting stations. Simulation results show the above. This proposed scheme is applicable for monitoring on-air images using embedded ID information at broadcasting stations, because of assuring high quality.
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  • An Enlargement Method of Digital Images Based on Laplacian Pyramid Representation without Edge-Effect
    Yasumasa TAKAHASHI, Akira TAGICHI
    Article type: Article
    Session ID: BCS2001-50/MIP2001-1
    Published: November 22, 2001
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.25.78.0_23
    CONFERENCE PROCEEDINGS FREE ACCESS
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    It is necessary to predict unknown higher-frequency components which are lost by sampling for enlarging digital images. Based on Laplacian pyramid representation, the prediction of unknown higher-frequency components is equivalent to the prediction of an unknown high-resolution Laplacian image. Greenspan et.al., proposed the image enlarging method based on this Laplacian pyramid representation. This method has two free parameters and Takahashi et.al., found suitable these two parameters by seven natural digital images. However, the artifacts are appeared near the step-edge regions of the enlarging result with two parameters. In this paper, we derive suitable two parameters for the step edge signal. We show the step edge type signal is detected by using the two layers of Laplacian images. Thus, we can detect the step edge signal regions into the processed image and we apply the two parameters for the step-edge signal at these regions. Excellent enlarging images without artifacts near the edges are obtained by the novel method.
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  • MPEG-4 Video Decoder Using VLIW Based Media Processor
    Masao ISHIGURO, Yoshifumi FUJIKAWA, Muneaki YAMAGUCHI, Kazushige HIROI ...
    Article type: Article
    Session ID: BCS2001-51/MIP2001-1
    Published: November 22, 2001
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.25.78.0_31
    CONFERENCE PROCEEDINGS FREE ACCESS
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    We have developed the MPEG-4 Simple Profile Video decoder using the MAPCA media processor based on the VLIW architecture. The MAPCA supports programmable video, image, and signal processing software implementation of compression and decompression algorithms, so the MAPCA matches the cost and performance features of dedicated fixed function chips, with the added flexibility to rapidly respond to evolving standards. By efficient use of SIMD instructions, the DMA engine "Data Streamer", and the VLx co-processor, the decoder can decode a video stream of CIF(352×288 pixel), 30fps and 384kbps at 50MHz of the CPU clock.
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  • A Study on data broadcasting services using dynamic link information for moving objects
    Kenjiro KAI, Kiyoyuki DOI
    Article type: Article
    Session ID: BCS2001-52/MIP2001-1
    Published: November 22, 2001
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.25.78.0_37
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Data broadcasting services which provide information of moving objects on TV screen, are studied. A basic scheme which uses BML(Broadcast Markup Language) for multimedia presentation and event messages for transmitting dynamic link information, is shown first. An experimental system for confirming basic functions of proposed services is developed. The experimental system consists of dynamic link information production part, MPEG-2 video encoder, data multiplex unit, 8PSK modulator and BS digital receivers. By using this experimental system, it is clarified that event message reception and processing time using BS digital receiver is approximately 0.10-0.17 seconds. Feasibility of these services and merits of proposed human interface are also verified.
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  • [title in Japanese]
    L. Belleguie, [in Japanese]
    Article type: Article
    Session ID: BCS2001-53/MIP2001-1
    Published: November 22, 2001
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.25.78.0_45
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Recently, media convergence and interoperability over multiple networks is becoming a determining factor for the success of new digital broadcasting and telecommunication services. In this presentation, we propose an original architecture framework providing a mean for seamless transport of RTP baesd streaming over both Internet and ISDB (ARIB) networks. This goal is achieved by using the independence of the RTP protocol from the transport layer, and by remarking that MPEG-2 based systems such as ISDB provide a high-quality packet delivery scheme with the DSM-CC protocol. We propose to carry RTP/RTCP packets in DSM-CC messages, whereas an RTSP messages subset is being mapped onto ARIB DSM-CC event messages.
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  • The Interference and Receiving performance experiments of Digital Terrestrial Television Broadcasting : The interference of ATSC and ISDB-T, and receiving performance of each system
    Yoshitaka ANDO, Kohei KAMBARA, Syunji NAKAHARA, Hiroo ARATA
    Article type: Article
    Session ID: BCS2001-54/MIP2001-1
    Published: November 22, 2001
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.25.78.0_51
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Channel interference characteristics between the ISDB-T signal and the ATSC signal, which will be adopted in South Korea, were measured for the basic data of channel planning. The ATSC signal interference with the ISDB-T signal was the same as the ISDB-T signal interference with the ISDB-T signal. In addition, robustness against the multi-path disturbance and the flutter disturbance was measured using ISDB-T and ATSC receivers.
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  • MOS Experiments of QHD(Quadruple HD:3840^*2048 pixels) Images and Proposal of Application with QHD Images
    Kenji TANAKA, Yasunari SUZUKI, Terumasa AOKI, Hiroshi YASUDA
    Article type: Article
    Session ID: BCS2001-55/MIP2001-1
    Published: November 22, 2001
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.25.78.0_59
    CONFERENCE PROCEEDINGS FREE ACCESS
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    The authors proposed an ultra-high definition image format (QHD: Quadruple HD), which provides double the resolution of HDTV image format in both lengthwise and crosswise. Based on this format, we developed QHD camera, which captures each color of RGB by single chip, and QHD projector, which displays each color of RGB by single chip. On the other hand, many common carriers begin to provide high-speed network services, as a consequence, 100 Mbps network service is made available to users at their home. In this paper, we would like to describe the outline and the result of a subjectivity evaluation experiment of the QHD image carried out using the still-frame picture. From this experiment, we can get the high evaluation to the QHD image and the evaluation result about the influence of the compression rate and tile size at the time of compressing by JPEG2000. We would like to propose an image distribution model as one of the applications of WHD images or QHD images for homes. This model offers the contents which are effective, high-definition and adapted for a viewer's needs using the tiling function of JPEG2000. Also, we would like to describe about the outline and important points about this model.
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  • A method determining tone conversion characteristics of digital still camera from two pictorial images
    Masao INUI, Takashi YAMAZOE, Shin-ichiroh NODA, Yoshihiko AZUMA
    Article type: Article
    Session ID: BCS2001-56/MIP2001-1
    Published: November 22, 2001
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.25.78.0_65
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Tone conversion characteristics of a digital still camera are usually determined by taking a gray scale. We have developed a new method for determining a tone conversion characteristics of a digital still camera from two pictorial images of different exposures without a gray scale. Calculated characteristics obtained by the new method are compared to measured values for gray scale. The comparison demonstrates a good agreement between the characteristics and measured digital values except in a lower region where flare light may be added. The method can be applicable to color management of digital still cameras.
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  • Image restration of the Gray Scale Image from Binary Image using Kalman Filter
    Takanori YABE, Ken-ichi TANAKA
    Article type: Article
    Session ID: BCS2001-57/MIP2001-1
    Published: November 22, 2001
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.25.78.0_71
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Several investigations were reported as inverse halftoning. In previous inverse halftoning methods, there are two problems. One is edge blurred when tone of the reconstructed image is smooth. Another one is that reduction of the noise is not sufficient when edge of reconstructed image is emphasized. In this article, Kalman filter is introducted into inverse halftoning to solve these two problems. As a result, the effectiveness of Kalman filter is shown from the viewpoint of noise reduction.
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  • A Study on Similarity Based Image Watermarking
    Yoko MAEMURA, Xiatong HU, Makoto FUJIMURA, Hideo KURODA
    Article type: Article
    Session ID: BCS2001-58/MIP2001-1
    Published: November 22, 2001
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.25.78.0_77
    CONFERENCE PROCEEDINGS FREE ACCESS
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    The Image watermarking is finding more and more support as a possible solution for the protection of intellectual property rights. To this aim, we propose the watermark technique using the similarity of block-pertitioned image. In this method, we use the correspondence map (Collage Map) between domain and range blocks in fractal compression algorithm to embed the watermark into the image.
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  • [title in Japanese]
    Article type: Appendix
    Pages App1-
    Published: November 22, 2001
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.25.78.0_App1
    CONFERENCE PROCEEDINGS FREE ACCESS
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