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Displaying 1-18 of 18 articles from this issue
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Article type: Cover
Pages Cover1-
Published: January 18, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (16K) -
Article type: Index
Pages Toc1-
Published: January 18, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (111K) -
Gosuke OHASHI, Keita MOCHIZUKI, Yasutake NAGASHIMA, Yoshifumi SHIMODAI ...Article type: Article
Session ID: MIP2002-6/AIT2002-6/
Published: January 18, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWe propose a new feature extraction method for content-based image retrieval using a graphical rough sketch. The proposal image feature is based on the shape and the texture of the object. This edge-based feature extraction method is to represent the relative positional relationship between edge pixels. This proposed feature has advantage of shift-invariant, scale-invariant, and rotate-invariant. To verify the effectiveness of this method, we have carried out two experiments. First, in order to assess the extracted feature value, a comparison of subjective evaluation was performed using Multi-Dimensional Scaling. The result is in good agreement with human perceptual judgments. Then, as a result of applying the method to 3,200 images from COREL photo gallery, we found that the proposal feature is effective for image retrieval.View full abstractDownload PDF (754K) -
Hiroki Takahashi, Masayuki NakajimaArticle type: Article
Session ID: MIP2002-7/AIT2002-7/
Published: January 18, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSImage segmentation is not only very important technique, but also challenging issue in Computer Vision. The segmentation of an image and grouping of the segmented regions as an object are very hard task for a computer, but they play a great role in human visual perception. There are, therefore, many researches in the field of color image segmentation. It is very difficult task to make a closed boundary for a region from obtained edges using edge detectors. Active contour model effectively extracts a boundary of an object, but initial boundary affects the final results. Moreover, statistical models have optimization difficulties. In this paper, a region growing approach which employs several internal features in a region and difference between two adjacent regions is proposed. Small regions occur on irregular boundaries or texture regions by using the conventional region growing segmentation approaches. Our approach reduce the small regions by using size, color distributions, edge magnitude and average color of regions. Moreover, the proposed method extracts segments suitable for human visual perception. The paper shows some examples on both synthetic and real images.View full abstractDownload PDF (765K) -
Ayuko TAKAGI, Masayuki KUROSAKI, Hitoshi KIYAArticle type: Article
Session ID: MIP2002-8/AIT2002-8/
Published: January 18, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThis paper describes an effective technique for coding QCIF video sequences based on a JPEG2000 codec. In the proposed method, two or more frames are combined into one large picture. The larger picture enables images to be coded more efficiently. Image quality is further improved by combining the frames symmetrically. The video sequence is efficiently coded by adapting the time correlation of the video sequences to spatial correlation. We demonstrated the effectiveness of this method by encoding QCIF video sequences using JPEG2000.View full abstractDownload PDF (461K) -
Yu Tokuno, Isao Nishihara, Shizuo NakanoArticle type: Article
Session ID: MIP2002-9/AIT2002-9/
Published: January 18, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWe proposed a video-transmission method that recovers the video degradation imposed by data losses at the receiver. P and I-pictures have high priority while B-pictures have low priority. This method uses the divided motion vector of next P-picture to the B-picture, which was lost in transmission. This method can improve the video quality. Unfortunately, the block-noise created by quick motion triggers an increase in intra-macroblock frequency. This paper introduces an improved recovery method that decreases block-noise by adding temporary motion-vectors to intra-macroblocks to decrease the difference from inter-macroblocks. A key result is the preservation of object edges; improvements are also seen in terms of PSNR and PQR values. A subjective evaluation indicates that the improvement in recovered video quality is discernable.View full abstractDownload PDF (1050K) -
Ichiro Matsuda, Susumu ItohArticle type: Article
Session ID: MIP2002-10/AIT2002-1
Published: January 18, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThis paper proposes a novel video coding scheme based on combination of motion compensation and wave form coding. In order to realize appropriate bit-allocation to both motion compensation and wave form coding, we employ a waveform coding algorithm called matching pursuits which can freely control a coding rate of motion compensated frame differences. Moreover we develop an iterative motion compensation method which can successively improve quality of reconstructed images, and combine it with the above matching pursuits seamlessly and adaptively. In other words, motion compensation and matching pursuits are carried out repeatedly in the order of decreasing coding efficiency. Simulation results indicate that the proposed coding scheme shows SNR gains of 0.5-1.3 dB over the H.263 standard for typical QCIF sequences.View full abstractDownload PDF (960K) -
Nobuyuki Ishibashi, Yoshitugu Manabe, Kunihiro ChiharaArticle type: Article
Session ID: MIP2002-11/AIT2002-1
Published: January 18, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThe contents of the "Postcard Letter" have been analyzed by us who think that the "Postcard Size" will be enough space for exchanging the electronic information in usual living home. Usually, we use and write only 25 Chinese/Japanese characters on less than 30 lines for a Postcard Letter. Most simplified handy electronic information terminal will be required which picture size shall be larger than the cellular phone or the PDA (personal Digital Assistance), and smaller than PC (Personal Computer). We would like to recommend an example ------the electronic terminal facility "ZALAND"------to be fit above conditions and the elderly person.View full abstractDownload PDF (587K) -
Peisuei Lee, Chia Fang Lee, Hiroki TakahashiArticle type: Article
Session ID: MIP2002-12/AIT2002-1
Published: January 18, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThis paper describes the process and creation of interactive computer formative system based on an evolutional model. The evolutional model has a sound environment, which has prototypes of creatures inside. Initially, the prototypes move randomly using preprogrammed "energy" within them. When the mouse is moved, these prototypes gravitate towards the cursor, which is a metaphor for the sun, the creator of life. Just as real life forms move towards the sun, so the prototypes grow and move together towards the cursor. We call these shapes "creatures." When these creatures join together, they cross over and sometimes mutate, based on the evolutional model they are following. These "creature formative system" can automatically replicate them.View full abstractDownload PDF (612K) -
Akira YOKOYAMA, Masaki HAYASHIArticle type: Article
Session ID: MIP2002-13/AIT2002-1
Published: January 18, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSComputer-generated characters are often seen these days on TV programs, in movies and so forth. They are called "synthetic" , "digital" or "virtual" actors and many of them are based on model-based computer graphics (CG). In model-based approaches, however, there is a trade-off between reality and model complexity. On the other hand, many recent studies have been made on image-based CG characterized by its visual reality. In this paper we introduce a new type of synthetic actor, which we call " 2D Image-Based Synthetic Actor" in accordance with the present state of CG technology. Our new synthetic actor has a high level of visual reality and can be made much more easily than a model-based synthetic actor by using a number of images acquired by filming a real actor.View full abstractDownload PDF (683K) -
Takeshi TAKAHASHI, Hiroyuki KASAI, Tsuyoshi HANAMURA, Hideyoshi TOMINA ...Article type: Article
Session ID: MIP2002-14/AIT2002-1
Published: January 18, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSMPEG-2 multi-program Transport stream (TS) achieves improvement of transmission efficiency by multiplexing several MPEG-2 streams. In this paper, we propose a transcoder that achieves rate reduction of MPEG-2 multi-program TS. For the purpose of realizing MPEG-2 multi-program TS transcoder, this transcoder requires a rate control scheme and remultiplexing scheme: The former improves average SNR values in total of all streams, and the latter achieves the evasion from failure of STD buffer. Next, from simulation experiments, we compare the conventional rate control scheme to the proposed one. On the other hand, we show the state of STD buffer. Finally, we show the effectiveness for our proposed scheme.View full abstractDownload PDF (562K) -
Yuko Saigo, Yoshiharu Fujita, Hiroshi Hasegawa, Masao Kasuga, Kazuo Ha ...Article type: Article
Session ID: MIP2002-15/AIT2002-1
Published: January 18, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThis paper proposed a new caricaturing method of facial expression using a small set of characteristic points on facial parts. Some caricaturing portraits were produced from facial images using this method. An experiment of the face recognition was carried out using the portraits and the recognition rates were measured about two facial expressions of 'normal (expressionless)' and 'joy (laughter)'. As a result, a high recognition rate of 97 % was obtained. Next, two evaluation experiments of five facial expressions of 'joy', 'anger', 'surprise', 'sadness', and 'normal' were carried out in the portraits and its original images. It is found that the perceived expressions were in good agreement with the presented expressions except for that of 'anger' and 'sadness'. The results obtained showed that the proposed method is effective for the expressions of 'joy', 'surprise', and 'normal'.View full abstractDownload PDF (435K) -
Junji Kawasaki, Kentaro Tachibana, Norihisa Mori, Kyoko Kato, Akira Ha ...Article type: Article
Session ID: MIP2002-16/AIT2002-1
Published: January 18, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWhen we see a binary black and white image, it appears, to our visual sense, to become clearer because of a pseudo halftone. We presented a theory and experimental results for layered model, which extend external world, retina and brain of the visual model, the equivalence approximation method. This paper propose the fixed equivalence approximation method, which modify the equivalence approximation method, it is difficult to find window size. We obtain experimentally the reconstructed images, the measure of approximation of density four division method, ordered dither method, simple two value method and least mean error method. The measure of approximation presents the objective estimation scale to coincide with the subjective estimation of the four modulation images by the fixed equivalence approximation method with the fixed window size and fixed approximation. We present the image estimation method, which is no significant difference between equivalence approximation method and fixed equivalence approximation method.View full abstractDownload PDF (1157K) -
Hideki Noda, Mahdad N. Shirazi, Eiji KawaguchiArticle type: Article
Session ID: MIP2002-17/AIT2002-1
Published: January 18, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSOne difficulty of textured image segmentation in the past was the lack of computationally efficient models which can capture statistical regularities of textures over large distances. Recently, to overcome this difficulty, Bayesian approaches capitalizing on computational efficiency of multiscale representations have received attention. Most of previous researches have been based on multiscale stochastic models which use the Gaussian pyramid decomposition as image decomposition scheme. In this paper, motivated by nonredundant directional selectivity and highly discriminative nature of the wavelet representation, we present an unsupervised textured image segmentation algorithm which is based on a multiscale stochastic modeling over the wavelet decomposition of image. For the sake of computational efficiency, versions of the EM algorithm and MAP estimate, which are based on the mean-field decomposition of a posteriori probability, are used for estimating model parameters and the segmented image, respectively.View full abstractDownload PDF (843K) -
Suma noji, Toshimichi Fujii, Masayuki NakajimaArticle type: Article
Session ID: MIP2002-18/AIT2002-1
Published: January 18, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThis paper presents an efficient method for generating complex motion of a human-like figure such as circus acrobatics including calculations for gravity and elasticity. The authors apply several motion dynamics techniques generated by using a motion generation engine. This allows iterative trial-and-error interaction to perform a wide range of acrobatic motion with a well designed user interface entailing the mouse, keyboard and joystick. Using this generator, some of the physical control parameters for the character such as gravity, rope angle, trampoline strength etc can be changed to affect the characters motion. We improved the dynamic motion algorithms for fester computation and we simplified the linked object structure and collision detection routines for a smoother operation during real-time interaction. As a results we can easily control the character's behavior on a variety of apparatus such as the trampoline, bungee swing, flying trapeze etc. This paper presents the methods we used to improve the motion generator using an interactive real time simulation. The methods used can be applied in the creation of games, movies and a broad repertoire of entertainment.View full abstractDownload PDF (667K) -
ANIMATION DATABASE SYSTEM AND ITS TOOLS FOR PRODUCTION(Session8 Broadcasting & Animation)(IWAIT2002)Fumio Sumi, Masayuki NakajimaArticle type: Article
Session ID: MIP2002-19/AIT2002-1
Published: January 18, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSCreating an animation sequence needs tremendous workloads and talented animators to specify and control motions. But it is very popular to make completely new animation without reusing existing sequences of animation. One of the reasons is the difficulty of retargetting the motion to the other models and deformation of the model shapes. If it is possible to provide the animation database, we can efficiently produce a new animation sequence using existing sequences. There are many research works in retargetting the motion data captured from motion capture system, but those are almost for 3D computer animation and there is none of the works in 2D animation. We propose a standard 2D animation database system, in which there are model data with motion in reusable form, and utility tools for deformation of model shapes and motions. We develop such techniques implemented in the tools as making reusable form of model shapes by vectorization, and educing motions from input bitmap images.View full abstractDownload PDF (397K) -
Article type: Appendix
Pages App1-
Published: January 18, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (76K) -
Article type: Appendix
Pages App2-
Published: January 18, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (76K)
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