ITE Technical Report
Online ISSN : 2424-1970
Print ISSN : 1342-6893
ISSN-L : 1342-6893
24.10
Displaying 1-19 of 19 articles from this issue
  • Article type: Cover
    Pages Cover1-
    Published: February 03, 2000
    Released on J-STAGE: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • Article type: Index
    Pages Toc1-
    Published: February 03, 2000
    Released on J-STAGE: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • Yasuo Suzuki, Hiroyuki Honda, Miki Haseyama, Hideo Kitajima
    Article type: Article
    Session ID: IDY2000-51/HIR2000-1
    Published: February 03, 2000
    Released on J-STAGE: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    This paper proposes a method to reduce error of reconstruted image by changeing domain block search in IFS image coding with the cost function. The IFS image coding with the cost function reduces error of the image by considering errors and bit-rates when a range block is divided. On the other hand we have proposed a method to improve the image quality by the extent of similar region search for domain blocks before the range block division. The proposed method improve further the image quality by combining the above two methods. The experimental results show the effectiveness of the proposed method.
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  • Megumi Takezawa, Hiroyuki Honda, Miki Haseyama, Hideo Kitajima
    Article type: Article
    Session ID: IDY2000-52/HIR2000-2
    Published: February 03, 2000
    Released on J-STAGE: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    This paper proposes a new method to quantize IFS parameters in fractal block coding by using a genetic algorithm(GA). In the fractal block coding how to quantize the IFS parameters is significant, because the nearest quantization values do not necessarily provide high-quality reconstructed images. Therefore, in order to obtain them, we report a novel GA-based quantization method. The proposed method searches for the best set of the quantized IFS parameters in shorttime, moreover provides the high-quality reconstructed images.
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  • Michiharu Niimi, Hideki Noda, Eiji Kawaguchi
    Article type: Article
    Session ID: IDY2000-53/HIR2000-3
    Published: February 03, 2000
    Released on J-STAGE: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    This paper proposes a near-lossless image compression scheme which is based on both the replacement of random noise with a predictable pattern and the lossless binary image compression of bit-planes. Random noise on the binary image prevents from achieving at high compression ratio. A solution is to replace the random noise with a predictable pattern. Squared-local regions like random noise are replaced with a checker board pattern, Random noise on the upper bit-planes is stored. Random noise on the lower bit-planes is not stored but generated by pseudo-random number in decoding because the lower bit-planes have no significant information.
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  • Kouji Suehira, Miki Haseyama, Hideo Kitajima
    Article type: Article
    Session ID: IDY2000-54/HIR2000-4
    Published: February 03, 2000
    Released on J-STAGE: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    This paper proposes image improvement for full-frame DCT image coding. Conventionally an image is divided into small blocks of pixels ; DCT is applied to each block. However, block distortion arises under a low bit rate. Block distortion is completely removed by using full-frame DCT, but quantization errors are spread over the entire image. Especially, we easily remark high-frequency noise in flat rgions. This paper poposes image improvement using adaptive post-filtering.
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  • Junichi NAKAJIMA, Yoshiyuki YASHIMA, Naoki KOBAYASHI
    Article type: Article
    Session ID: IDY2000-55/HIR2000-5
    Published: February 03, 2000
    Released on J-STAGE: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    MPEG-2 is widely used for video meterial transmission or digital broadcasting, The other side, for storage, production, or editing of video material, lossless coding system is often required. In layered lossless coding system in which MPEG-2 is performed as a base layer and residual image signal coding as an enhancement layer, we propose a new method to decrease entropy by dividing frequency distribution of residual image signal according to MPEG-2 parameters. Some computer simulation by applying arithmetic coding algorithm to the divided residual image signal were performed, and their results show that 4 to 8% of the amount of bits generated by using conventional method can be reduced.
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  • Masato DATE, Akihiko SUGIURA
    Article type: Article
    Session ID: IDY2000-56/HIR2000-6
    Published: February 03, 2000
    Released on J-STAGE: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    Transmission system for compressed information has been studied for the purpose of efficient transmission for multimedia information. If part of the compressed image information are erred on transmission, sometimes played video will suffer great influence. Our study quantify analyzed influence that error bit cause obstacle for played video on MPEG. Then we will add adaptive value to every bit based on quantification. Therefore we will develop transmission system with good quality video on same error rate. In this paper, we seek significant bit to decline video quality using S/N which source video is compared with played video that turned at only one bit from MPEG bit stream. And we materialized to quantify MPEG bits.
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  • Mitsunobu KAMATA, Akihiko SUGIURA
    Article type: Article
    Session ID: IDY2000-57/HIR2000-7
    Published: February 03, 2000
    Released on J-STAGE: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    If a means to broadcast become diversified and still more programs are demanded, to advance and simplifying technique of making contents are necessary. When we input the posture of agent to operate the virtual CG actor, we want to not use a special studio and devices. In this paper, we suggest the extracting method from a picture by using defocusing estimation. If the object in picture is in focus, others in picture are out of focus. Then, this method extracts the object by estimating defocuses each pixel using partial autocorrelation and removing parts have a great distance from a focus. We make the experiment with a picture that is in focus taken by Digital Camera, and a satisfactory result is obtained.
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  • Masahiko Horiguchi, Yoshinori Takeuchi, Noboru Ohnishi
    Article type: Article
    Session ID: IDY2000-58/HIR2000-8
    Published: February 03, 2000
    Released on J-STAGE: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    In conventional real-time object tracking systems with pan-tilt camera, a camera in stopped for simple frame subtraction and prosessing. However, in order to perform fast and stable tracking, a system should process images captured during its rotation. We propose a method for extracting a moving target and estimating its image velocity from a sequence of images captured by a moving camera. Assessing the effect due to images plane rotation, we have found that on position shift a background can be well eliminated by translation of a previous frame and frame subtraction. We investigate about improvement of the accuracy of the velocity of a moving object, used for predictive control of a camera, by compensating non-linearity between velocity and optical flow in large displacement. We implemented the above methods in a real-time tracking system and conducted an experiment. As a result, the system could stably track a walking human in a room with complex background by processing non-interlace images of 1/60 [s] interval.
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  • John GATES, Miki HASAYAMA, Hideo KITAJIMA
    Article type: Article
    Session ID: IDY2000-59/HIR2000-9
    Published: February 03, 2000
    Released on J-STAGE: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    This paper presents a high-accuracy real-time circle extraction algorithm. The algorithm is capable of extracting both complete circles and circular arcs from complex images. The algorithm was tested with a variety of natural and synthetic 256 × 256 grayscale images and an average frame rate of more than 69 frames per second was obtained using a 450 MHz. Pentium II Processor. Experimental results are presented which demonstrate the high-accuracy of the algorithm.
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  • Kenichi Aso, Wataru Mitsuhashi
    Article type: Article
    Session ID: IDY2000-60/HIR2000-1
    Published: February 03, 2000
    Released on J-STAGE: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    Experimental results are presented in this paper for blind image deconvolution to restore degraded images without information on the cause of degradation. The NAS-RIF algorithm, proposed by D.Kundur etal., is utilized to restore degraded images with only limited information, for example, the nonnegativity of the original image and the support size of the object. In the NAS-RIF algorithm, a cost function is defined to have convexity and the original image is restored by recursive filtering to minimize the cost function. Experimental results demonstrate highly efficient performance of the NAS-RIF algorithm.
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  • Shingo Itami, Wataru Mitsuhashi
    Article type: Article
    Session ID: IDY2000-61/HIR2000-1
    Published: February 03, 2000
    Released on J-STAGE: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    An adaptive microphone system is proposed to address the directivity to a specified speaker and track the speaker's motion. This system is constructed on the basis of the generalized sidelobe canceller, and modified to have robust features for the speaker's motion, by adapting the spatio-temporal characteristics of the microphone array. Experiments to track a target sound source and eliminate ambient noises are performed in our laboratory room without anechoic consideration. The experimental results show that the proposed system can track the moving sound source and the noises are clearly reduced.
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  • Jun-ichi Okuyama, Wataru Mitsuhashi
    Article type: Article
    Session ID: IDY2000-62/HIR2000-1
    Published: February 03, 2000
    Released on J-STAGE: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    A new approach to segment images composed of different textures is presented in this paper. We modified Texture Spectral Method, proposed by Wang et al., to decrease the number of spectral components by considering the geometrical meaning for a local change of image intensities. The number of spectral components is considerably reduced and the local strucute of image intensities can be clearly recognized by this approach. We applied the proposed approach to extract different types of image features and the experimental results on various images are presented.
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  • Tomonori Nonaka, Wataru Mitsuhashi
    Article type: Article
    Session ID: IDY2000-63/HIR2000-1
    Published: February 03, 2000
    Released on J-STAGE: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    To recognize an object with an arbitrary attitude, the employed algorithm must guarantee an ability to extract invariant features against various attitudes of the target object. In this paper, we propose a new method to discriminate an object in 2D image plane moved with unknown parameters of motions such as rotation, dilation, and translation. The method is based on the exponential chirp transform(ECT), proposed by G. Bonmassar and E.L. Schwartz, to perform the complex-logarithmic mapping(CLM)with a slight offset for avoiding the singularity around the origin. There is a fast algorithm for ECT, and the size of images to be processed is considerably reduced by the CLM, thus yielding a fast performance for pattern recognition. Experimental results show that an object with arbitrary motions is reliably discriminated.
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  • Haruo Hiki, Fumio Maehara, Yoshikazu Tanno, Manabu Ito, Fumio Hasagawa
    Article type: Article
    Session ID: IDY2000-64/HIR2000-1
    Published: February 03, 2000
    Released on J-STAGE: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    According to the expansion of the broadcasting channels, shortage of the contents becomes a problem. Here we report the Multi-point Tele-production system for Large-scale video archives, which enable the remote retrieval of the archive data from a terminal located in the far distance. (Here 10km distance for the experiments). And remote control and remote editing are enabled in the system, which consists of the main editing facility, the satellite editing terminal and the retrieval terminal for the large-scale archive. As the optical fiber connects these locations, co-operative remote editing is done between them. The conventional remote control functions such as server control, VTR control, cut, wipe are also included in the system functions.
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  • akihito Yagami, Akira Tatsumi, Ikuji Fujitani
    Article type: Article
    Session ID: IDY2000-65/HIR2000-1
    Published: February 03, 2000
    Released on J-STAGE: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    Investigations are being vigorously promoted to lead to the start-up of Digital terrestrial broadcasting in the Kanto Kinki and Chukyo regions by the end of 2003. The digital broadcast channel plan will utilize currently operating UHF TV bands, so it will be necessary to effectively arrange a limited number of channels in each region, while at the same time minimizing the effects on existing analog stations. In this situation, it will be important to determine how much interference wave fading margin can be expected. Here, the authors provide a summary of verification tests relates to required fading margins, based on fixed observation data for compressive strength of incoming waves forming a propagation path over the Bay of Ise.
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  • Masaki EMOTO, Sumio YANO
    Article type: Article
    Session ID: IDY2000-66/HIR2000-1
    Published: February 03, 2000
    Released on J-STAGE: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    To investigate visual fatigue and loads in watching a stereoscopic television, we studied the changes in visual functions, especially fusional range and AC/A ratio after watching stereoscopic High Definition TV. The results showed that after 1 hour's watching two dimensional HDTV, subjects' fusional ranges showed no significant change, while after 1 hour's watching stereoscopic HDTV, they showed significant change and restored after rests. It showed no significant change in AC/A ratio. It also showed that subjects who can perceive a stereogram by freefuse have wider fusional range than subjects who cannot.
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  • Article type: Appendix
    Pages App1-
    Published: February 03, 2000
    Released on J-STAGE: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
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