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Displaying 1-18 of 18 articles from this issue
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Article type: Cover
Pages Cover1-
Published: June 23, 2008
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (12K) -
Article type: Index
Pages Toc1-
Published: June 23, 2008
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (62K) -
Tetsuya MIYAZAWA, Syota NOTE, Junichi AKITAArticle type: Article
Session ID: IST2008-19/ME2008-77
Published: June 23, 2008
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThis paper proposes the architecture of vision chip for optical flow estimation with the capability of small size, fast process and low-latency by integrating image sensor and processing circuits into a single chip. We employed the block matching algorithm (BMA) for optical flow estimation, whose search range can be reduced by increased flame rate. The DMA is carried out by the column-parallel processing circuitry, where the processing circuit at each column performs the operation for the pixels in one column. The estimated clock frequency required for the optical flow with the frame rate of 200fps is 8MHz. We also discuss the relation among the block size, brightness depth, and the accuracy with the captured images.View full abstractDownload PDF (735K) -
Keisuke Doumae, Junichi AkitaArticle type: Article
Session ID: IST2008-20/ME2008-78
Published: June 23, 2008
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSIn this paper, we propose Vision Chip for directing the line of sight including saccade. Line of sight can be determined by the positions of the pupil and the Purkinje's image in eye image. The vision chip described in this paper has the functions of detecting their positions, as well as generating the coordinates of their central point. We have already reported a high speed vision chip for line of sight detection including saccade based on the pixel parallel processing architecture , but its resolution is limited as very low for its large size pixel. In this paper, we describe the design and evaluation of the vision chip based on column-parallel processing for increased the resolution with keeping the processing speed, which is enough to track saccade.View full abstractDownload PDF (951K) -
Takeshi KADA, Kazuaki ISHIKAWA, Tadaaki HOSAKA, Takayuki HAMAMOTOArticle type: Article
Session ID: IST2008-21/ME2008-79
Published: June 23, 2008
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWe have investigated the dynamic biometrics using the dimensions of irises as a feature, which have not provided the sufficient performance. In this paper, new features based on the distance from the center to edge of irises, and the Fourier descriptor are considered. Experimental results showed the validity and effectiveness of the proposed features. Further, we examine the temporal variation for the verification performance, and the robustness of the proposed method is confirmed.View full abstractDownload PDF (662K) -
Haruhisa KATO, Akio YONEYAMAArticle type: Article
Session ID: IST2008-22/ME2008-80
Published: June 23, 2008
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThis paper evaluates the usability of the intuitive interface which can assign various operations by estimating camera motion on a mobile phone. Since many keys are generally mounted in a mobile phone, a complicated function can be assigned adequately, but it is hard to say that it superior to in usability. Moreover, since the mobile phone cannot recognize that multiple keys were pressed simultaneously, it has the problem that the keypad cannot respond to multiple operations at once. In this paper, in order to evaluate the efficiency of the camera based intuitive interface, we implemented 3D map application which can operate a viewpoint and eye direction on the mobile phone. Multiple subjects measured the time which moves 3D map, and performed subjective evaluations, such as usability of camera based intuitive interface. The experiment showed that operation by the intuitive interface was significantly superior to operation by the keypad.View full abstractDownload PDF (686K) -
Kazunori MIYATAArticle type: Article
Session ID: IST2008-23/ME2008-81
Published: June 23, 2008
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThis paper reports our interactive systems that combine digital media processing, such as computer graphics and image processing, and various sensing technology.View full abstractDownload PDF (2108K) -
Yoshikazu KAWAYOKE, Yoshifumi KANEKO, Keiji SHIBATA, Yasuhiro INAZUMI, ...Article type: Article
Session ID: IST2008-24/ME2008-82
Published: June 23, 2008
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSIn recent years, we became possible to viewing and listening to high quality video by digital broadcasting. However, there have a possibility that the blocking artifact is generated in video contents with a high motion. The image distortion by blocking artifact is an important problem which must be examined in digital broadcasting. This paper proposed an image quality improvement method which suppressed the occurrence of flicker and blocking artifact.View full abstractDownload PDF (1004K) -
Daigoro MIYAKAWA, Shinichi TANAKA, Toshiyuki YOSHIDA, Takeshi TSUKUBA, ...Article type: Article
Session ID: IST2008-25/ME2008-83
Published: June 23, 2008
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSTo realize the optimal video quality in a restricted transmission bandwidth, the authors have proposed a video coding technique based on MOS, in which the estimated MOS of the target video is maximized by controlling the number of frames per second and the average number of bits per frame within a constant bit rate. An application of the technique under a constant bit rate, however, results in fluctuations of video quality over scenes. This paper thus tries to improve lower-quality parts in a target video to stabilize the overall video quality by introducing a frame prescanning and buffering. A subjective quality assessment test has confirmed that the proposed technique actually improves the video quality.View full abstractDownload PDF (617K) -
Hiroyuki ARAI, Isao MIYAGAWA, Hideki KOIKE, Miki HASEYAMAArticle type: Article
Session ID: IST2008-26/ME2008-84
Published: June 23, 2008
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWe propose a novel technique for estimating the number of people in a video sequence ; it has the advantages of being stable even in crowded situations and needing no ground-truth data. By analyzing the geometrical relationships between image pixels and their intersection volumes in the real world quantitatively, a foreground image can be directly indicate the number of people. Because foreground detection can be done even in crowded situations, the proposed method can be applied to such situations. Also it can estimate the number of people in an a-priori manner, so it needs no ground-truth data which is necessary for existing feature-based estimating techniques. Experiments show the validity of the proposed method.View full abstractDownload PDF (658K) -
Norihisa KIYOFUJI, Akira OHNO, Takayuki HAMAMOTO, Tomoshi SASAKI, Tosh ...Article type: Article
Session ID: IST2008-27/ME2008-85
Published: June 23, 2008
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWe have been investigating a method of objects detection to remove an influence of change of environment light by using a different value between two image values when the modulated light is turned on and off. We propose the wide dynamic range image sensor for objects detection with a high degree of accuracy where the environment light is changing intensely. We get two values from the two capacitors that store charges by synchronizing with the modulated light in each pixel circuit. When the voltage of one capacitor exceeds a threshold voltage, the charges of same amount are removed from two capacitors and then we achieve the wide dynamic range imaging. We describe the pixel circuit of smart image sensor based on proposal method and evaluation results of the prototype chip.View full abstractDownload PDF (627K) -
Junichi AKITAArticle type: Article
Session ID: IST2008-28/ME2008-86
Published: June 23, 2008
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSConventional image sensors have the pixels arranged at lattice positions for ease of implementation. Lattice placement of pixels intrinsically has the problem of the directional singularity of the clarity on image representation, for example, the appearance of jaggy is dependent on the direction of the objects. In this paper, we describe the estimations on the optical characteristics of image sensors with pseudorandomly placed pixels for circle and rectangular shape in terms of the clarity on image representation.View full abstractDownload PDF (606K) -
Wataru TAMAKI, Kousuke IMAMURA, Hideo HASHIMOTOArticle type: Article
Session ID: IST2008-29/ME2008-87
Published: June 23, 2008
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSVideo coding methods have been based on hybrid coding which employs motion compensation and discrete cosine transform. On the other hand, another high efficiency video coding method using Matching Pursuits (MP) has been proposed in low bit rate. The Matching Pursuits algorithm represents a signal with an approximate from using a dictionary. On the results, coding performance depends on the dictionary greatly. In this paper, we introduce a technique of dynamic dictionary design, and we attempt to improve the coding performance by applying the dynamic dictionary at each frame in encoding process.View full abstractDownload PDF (549K) -
Masaharu SATO, Daisuke SEYAMA, Keiji SHIBATA, Yasuhiro INAZUMI, Yuukou ...Article type: Article
Session ID: IST2008-30/ME2008-88
Published: June 23, 2008
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSIn the image enlargement method, there are two techniques which are interpolation of pixel and presumption of high-frequency content. In the first case, there is a problem that blurring is generated in the enlargement image. In the second case, there is a problem that new artifact as ringing is added in the enlargement image. In this paper, we extrapolate High-Frequency content by Discrete Wavelet transform. The proposed method has possibility for reduction of noise that is generated by presumption failure, and represented effectiveness by the experimental result.View full abstractDownload PDF (995K) -
Yuukou HORITA, Takashi KOBAYASHI, Tetsuo AIDA, Keiji SHIBATA, Yasuhiro ...Article type: Article
Session ID: IST2008-31/ME2008-89
Published: June 23, 2008
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSPorus metals from which the application is expected as the next generation material has the pore internally. This material invents various characteristics with the pore. However, it is difficult to see an internal pore visually. Then, detailed pored information can be acquired as CT image by using it with X-rays CT device so far. Pore's feature and the material's characteristic are related in analyzing the CT image by using the image processing. This time, the Pore volume and the Pore relative density were obtained by analysing the CT image. As a result, it was proven to be a very useful.View full abstractDownload PDF (810K) -
Article type: Appendix
Pages App1-
Published: June 23, 2008
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (78K) -
Article type: Appendix
Pages App2-
Published: June 23, 2008
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (78K) -
Article type: Appendix
Pages App3-
Published: June 23, 2008
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (78K)
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