ITE Technical Report
Online ISSN : 2424-1970
Print ISSN : 1342-6893
ISSN-L : 1342-6893
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22.64
Displaying 1-13 of 13 articles from this issue
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  • [title in Japanese]
    Article type: Cover
    Pages Cover1-
    Published: November 20, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.64.0_Cover1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • [title in Japanese]
    Article type: Index
    Pages Toc1-
    Published: November 20, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.64.0_Toc1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • On a way to Retrieve Video using Gamon Information : Video "Fingerprints"
    Katsunao TAKAHASHI, Nobuyoshi TERASHIMA, Hideyoshi TOMINAGA
    Article type: Article
    Pages 1-8
    Published: November 20, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.64.0_1
    CONFERENCE PROCEEDINGS FREE ACCESS
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    In this paper, We propose "Gamon (Video "Fingerprints") Information" as Characteristic Information to find Video from Huge Video Archives. Like Human Fingerprints, Gamon that can be extracted easily can discriminate video by small amount of Information. This time, we extract a Characteristic Value from DC factors of Intra Frame of MPEG2 without full-decoding. And we put these Values in a time axis, we define this array of data as "Gamon". We make an expriment of CM check to inspect of Gamon effectiveness. Gamon proposed this time can be applied to current TV broadcast that isn't compressed, so we think Gamon very useful.
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  • An area-splitting parallel signal processor for a very-high resolution image acquisition system
    Hiroshi Shimamoto, Masayuki Sugawara, Kohji Mitani, Ichiro Yuyama, Yos ...
    Article type: Article
    Pages 9-15
    Published: November 20, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.64.0_9
    CONFERENCE PROCEEDINGS FREE ACCESS
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    An area-splitting parallel signal processor for a very-high resolution image acquisition system is developed. In order to realize a high-speed processing, acquired image data is devided into twenty four VGA-class images. The processor is also designed to be flexible with imager pixel counts or system requirements. A 4K×2K pixel color acquisition system with four progressively-scanned-two-million-pixel CCD imagers is developed, and an enhancement circuit is implemented with this processor.
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  • Stereo Vision using single camera for A Rotating Spherical Object covered with Smoothly Varying Surface
    Yoshiyuki KITAOKA, Yukiko KENMOCHI, SURYONO, Kazunori KOTANI
    Article type: Article
    Pages 17-22
    Published: November 20, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.64.0_17
    CONFERENCE PROCEEDINGS FREE ACCESS
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    In astronomy, there is a request for the method to get three-dimensional information of 'corona' from X-ray solar image were taken by observation satellite 'Yohkoh' as a clue to study of solar activity. 'Yohkoh' uses fixed single camera, but we can produce stereoscopic images with difference visual angle by rotation of the sun. Although the shape of 'corona' varies as time passes, and so the errors which are occured between the image pairs cause loss of the stereoscopic effect in the image. In this paper, In order to display accurate stereoscopic images, we research a method by morpholosical processing and affine transform to correct errors between the image pairs which are caused by varying surface. Then we apply the method to model pictures which are maked by Computer Graphics to evaluate availability of the method.
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  • Statistical characters of Super High Difinition and High Level Color Images and Their Lossless Coding
    Masae TODA, Yukiko KENMOCHI, Kazunori KOTANI, Shigeo KATO
    Article type: Article
    Pages 23-30
    Published: November 20, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.64.0_23
    CONFERENCE PROCEEDINGS FREE ACCESS
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    A Super High Difinition and High Level color image is defined as an image which contains 2000×2000 [pixels] or more and each of whose pixel has 12 [bits] or more for each color, red, green, blue. In these Super High Difinition and High Level color images, there is a problem such that the image data is too much because of the heights of the resolution and the level, and it consumes too much memory and time at the transmission and storing. Therefore, compression of the image data is necessary. Since the compresion must not causes any distortion and loss of the information in the image because of the meaning of Super High Difinition and High Level color images, we only consider lossless coding in thes paper. First we are investigete statistical characters of Super High Difinition and High Level color images, and then look for Lossless Coding (based on the Arithmetic Coding) which are adapted to these statistical characters.
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  • Applying the Hamiltonian algorithm to optimize JPEG quantization tables
    Kazutaka HIRATA, Jun-ichi YAMADA, Kazumasa SHINJO
    Article type: Article
    Pages 31-38
    Published: November 20, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.64.0_31
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Optimizing quantization tables is expected to improve both the compression ratio and the quality of JPEG image to transmit or store. We propose applying the Hamiltonian algorithm for this optimization of JPEG quantization tables and show evidence that the algorithm is effective in doing so.
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  • Object-based Motion Compensation using Sets of Affine Transform Parameters
    Takehiko ANDO, Masato TSUKAHARA, Hideo HASHIMOTO
    Article type: Article
    Pages 39-44
    Published: November 20, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.64.0_39
    CONFERENCE PROCEEDINGS FREE ACCESS
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    In this paper, motion compensation with segmentation is proposed. First, an image is uniformly divided into rectangular blocks as in BMA (Block Matching Algorithm) and a set of affine transform parameter estimated for each block is clustered by k-means algorithm. Next, each pixel is allocated to cluster based on prediction error culculated using affine transform parameters for each cluster. After eliminating small regions, segmented image is obtained. Computer simulation for the proposed object-based motion compensation prediction is performed, and simulation results are compared with that of BMA.
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  • Reduction of Transmitted Motion Vector Information in MPEG-2 Video Coding
    Masaaki KUROZUMI, Yoshimichi OHTSUKA, Kikufumi KANDA, Yukihiro NISHIDA ...
    Article type: Article
    Pages 45-51
    Published: November 20, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.64.0_45
    CONFERENCE PROCEEDINGS FREE ACCESS
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    In Japan, digital HDTV services via broadcasting satellite will start in 2000,and terrestrial digital broadcasting services are planned to start in after the year 2000. MPEG-2 standard has been adopted as a video coding scheme for these services. We investigate improvement methods of coding efficiency maintaining high picture quality. In MPEG-2 coding scheme, motion vectors are transmitted as differentials between vectors in adjacent macro-blocks. We show in this paper that the amount of transmitted motion vectors can be reduced by consolidated zero differential values, improving the PSNR of decoded pictures.
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  • Experimental Results using Frequency Diversity Technique for Mobile Reception of OFDM (3)
    Hiroyuki FUKUMORI, Kazufumi IMAICHI, Yuuji HIGUCHI
    Article type: Article
    Pages 53-58
    Published: November 20, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.64.0_53
    CONFERENCE PROCEEDINGS FREE ACCESS
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    The coded OFDM (Orthogonal Frequency Division Multiplexing) system minimizes the effect of multipath mobile channels by using the time-frequency interleaving. But for mobile reception there is possibility that the error correction is not effective enough. In this paper we describe from the experimental results that for mobile reception the selective diversity technique improves BER performances even at high speed moving (doppler shift is 3% of the carrier spacing) and that at low speed moving the diversity technique is effective to change the encoding rate from 1/2 to 3/4.
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  • A study on equalization techniques for an OFDM system
    Akio Yamamoto, Takashi Ookubo, Sadao Tsuruga, Hiroshi Nogami, Keizo Ni ...
    Article type: Article
    Pages 59-64
    Published: November 20, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.64.0_59
    CONFERENCE PROCEEDINGS FREE ACCESS
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    We have studied equalization techniques using pilot carriers for an OFDM system. The signal to interference ratio (SIR) of the equalizer output signal over a time-invariant multipath channel (D/U=10dB) are measured for constant interpolation and simplified liner interpolation (which can be realized without multipliers) for the channel response estimation. The results show that the SIR of 27dB (input CNR=30dB, delay time of interference signal=10μS) are obtained for the simplified linear interpolation. We have also calculated the SIR for equalized signal in case of the interpolation by FIR filters with the sinc functional impulse response against the number of coefficient bits. The results show that the bit accuracy of the FIR tap coefficients of 10 bits are required without degradation of the SIR.
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  • A study of Hierarchical Modulation for Mobile Reception in SFN
    Syu TOMIYA, Minoru HIRAI, Yuuji HIGUCHI, Tohru HOSHINA
    Article type: Article
    Pages 65-72
    Published: November 20, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.64.0_65
    CONFERENCE PROCEEDINGS FREE ACCESS
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    OFDM (Orthogonal Frequency Division Multiplexing) is robust under multipath fading conditions, and is a suitable method for terrestrial digital broadcasting systems. Accordingly, OFDM is available to mobile reception, and has possibility of SFN (Single Frequency Network). This pepar proposes a hierarchical modulation multiplexing for the transmission between relay stations in SFN. Further we evaluated the influence of the hierarchical modulation multiplexing on broadcasting waves by computer simulation, and experimentation with a built test equipment.
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  • [title in Japanese]
    Article type: Appendix
    Pages App1-
    Published: November 20, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.64.0_App1
    CONFERENCE PROCEEDINGS FREE ACCESS
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