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Displaying 1-21 of 21 articles from this issue
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Article type: Cover
Pages Cover1-
Published: February 28, 2012
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (13K) -
Article type: Index
Pages Toc1-
Published: February 28, 2012
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (63K) -
Yuji SAKAMOTO, Yoshinari SHIRAI, Toshihiro TAKADA, Shigeru KATAGIRI, M ...Article type: Article
Session ID: HI2012-47/3DIT2012-1
Published: February 28, 2012
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWe propose a new method for interactively searching for image targets, which are buried in video data. The method uses the metaphor of excavation, and it provides users a tool, i.e., a kind of shovel, for digging for the image targets. Users can dig for the targets using this shovel and reference information about target's positions. Through experimental evaluations, we report the fundamental utility of the proposed method.View full abstractDownload PDF (657K) -
Hayato KAWAKAMI, Junichi AKITAArticle type: Article
Session ID: HI2012-48/3DIT2012-1
Published: February 28, 2012
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSLine-of-sight (LoS) detection, which is a technology for detecting what the user is looking at, is an attracting as a new type of user interfaces. The eyeball also moves very rapidly, which is called as saccade, as well as the conventional LoS tracking, and the saccade is also expected to be used as an another type of user interfaces. Although real-time tracking of saccade is difficult by conventional LoS detection systems for their long processing time or latency. The authors have been developing LoS detection system using Vision Chip, which is an integration of the image sensor and image processing circuitry on single chip, to achieve fast and low latency processing. LoS is calculated by the center position of the pupil from an eye image. However, the pupil may be covered in some cases, such as by a chipped circle by the eyelid, eyelashes, shadows, or anything around the eyeball that results in an error in the LoS calculation. In this paper, the image processing strategy for improving the LoS calculation accuracy that can be implemented on the Vision Chip's parallel architecture, is discussed.View full abstractDownload PDF (748K) -
Yasunaga MONNO, Hirohiko KANEKO, Makoto INAGAMIArticle type: Article
Session ID: H12012-49/3DIT2012-1
Published: February 28, 2012
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWhen we actively move an object with hands, the speed and trajectory of the motion are predictable to some extent. From this fact, we assumed that the percept of the motion produced by self action and that of the motion observed passively were different. To test the assumption, we compared the perceived speed of moving object moved actively and that observed passively. Result showed that there was the influence of self action on perceived speedView full abstractDownload PDF (476K) -
Shohei MATSUOKA, Ko SAKAIArticle type: Article
Session ID: HI2012-50/3DIT2012-1
Published: February 28, 2012
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSGestalt factors are known as cues for the perception of the direction of figure. A previous study has suggested that the promotion of the direction of figure depends on "convexity" and "closure" among Gestalt factors in local contours of natural images. However, the interaction between these factors has not been clarified in natural scenes where various cues are present simultaneously. The present study examined psychophysically the effect of interaction between convexity and closure on the perception of the direction of figure. First, we selected systematically local contours (image patches) from natural images based on indices of convexity and closure. Then, we conducted psychophysical experiment to measure the direction of figure that is perceived from the local contours. Our multiple regression analysis showed that the direction of figure was judged in the direction of "closure" in the simultaneous presence of multiple factors such as in natural scene. The results also showed that the perception was highly sensitive to the direction of closure; it depended on the direction of closure, but not proportionally to the index of closure.View full abstractDownload PDF (671K) -
Makoto YOSHIKAWA, Osamu WATANABEArticle type: Article
Session ID: HI2012-51/3DIT2012-2
Published: February 28, 2012
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWe often perceive a color that is inconsistent with the light reflected from an object. For example, we can perceive constant colors despite changes in illumination. Therefore, it is considered that our visual system would correct the estimates of object colors with the statistics of surrounding colors. Recently, reverse correlation, or Classification Image analysis, has been used to reveal how the scene statistics affect color perception. However, there is a possibility that these conventional methods provide biased estimates when higher-order scene statistics affect color perception. Here we investigates the influences of surrounding colors on apparent color shift with a reverse correlation method considering the nonlinearity underlying observer's decisions.View full abstractDownload PDF (689K) -
Kazuho FUKUDA, Keiji UCHIKAWA, Donald I. A. MACLEODArticle type: Article
Session ID: HI2012-52/3DIT2012-2
Published: February 28, 2012
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSOn color constancy, the ability to perceive stable object color, it was shown that brighter surrounding colors had greater influence than dim colors. However, bright colors in real scenes, such as luminous objects and metallic luster, do not necessarily have information about its scene illumination. The question here is whether bright colors in the illuminant mode affect color constancy. The results showed that the effect of brightest surrounding colors on the color perception of a test surface diminished at the luminance balance where the brightest color appeared as an illuminant. This suggests that the visual system might accomplish color constancy using only surfaces in the surrounding colors.View full abstractDownload PDF (634K) -
Junichi AKITAArticle type: Article
Session ID: HI2012-53/3DIT2012-2
Published: February 28, 2012
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThe final purpose of image systems, composed of the camera and the display, is to repsesent 'clear' images, and the conventional development in imaging technologies have been focused on increasing resolutions and enabling wider dynamic range, for instance. The word of 'clear' should indicate that 'clear for human eyesight'. Some researches have been reported on evaluating the clarity of images in terms of considering the optical and perceiving characteristics of human eyesight systems, however, there are few discussions on wheather the conventional development in technologies really improve the 'clarity for human eyesight.' The author has been prosing and discussing the imaging systems with pseudorandomly placed pixels in order to eliminate the jaggies in images, since the human eyesight has high sensitivity for jaggies. In this paper, these methodologies and evaluations are described.View full abstractDownload PDF (682K) -
Mototeru KAWASAKI, Yuki NAKAMURA, Junichi AKITA, takanori KOMATSUArticle type: Article
Session ID: HI2012-54/3DIT2012-2
Published: February 28, 2012
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThe image systems have been developing toward the purpose of representing 'clear' images. The regular lattice pixel placement in the conentional image systems intrinsically have the problem of jaggies on diagonal line that may result in severely decrease the image clarity. The authors have been proposing and discussing the image systems with the psudoramdomly placed pixel for eliminating the jaggies in images. The clarity of the represented images by the psudorandom pixel placement deeply depends on the pixel configuration parameters, and the optimization of these parameters are not clarified. In this paper, it is described that the subjective experiments for optimizing three pixel configuration parameters; the size of luminescent area, the area displacement within the pixel, and the light diffusion from the area.View full abstractDownload PDF (683K) -
Yuki NAKAMURA, Mototeru KAWASAKI, Junichi AKITA, Takanori KOMATSUArticle type: Article
Session ID: HI2012-55/3DIT2012-2
Published: February 28, 2012
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSFor the purpose that human feels 'clear' when he see, image system has been developed. But it is impossible to eliminate the jaggies in traditional approaches, for example increasing resolutions and reducing noise. So the author proposes the image systems with pseudorandom pixel placement, and discusses about the jaggy elimination effect in moving pictures which was insufficient, based on subjective experiments.View full abstractDownload PDF (735K) -
Ryohei P. HasegawaArticle type: Article
Session ID: HI2012-56/3DIT-2012-
Published: February 28, 2012
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThere is recent world-wide interest in developing brain-machine interfaces (BMIs) as advanced assistive technologies. In this talk I will introduce our EEG-based communication system to control an avatar.View full abstractDownload PDF (265K) -
Tomoya Nishida, Shinya Seki, Tatsuya Hayashi, Nobuyuki YamawakiArticle type: Article
Session ID: HI2012-57/3DIT2012-2
Published: February 28, 2012
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSEEG-based spelling devices have a possibility to provide a communication tool to patients who severely paralyzed. We have made a spelling device based on the P300 event-related potential and investigated a proper channel to control the spelling device to lower costs. We used seven parameters (channel of EEG signal recording, font size of characters, index of estimation, preprocessing method of EEG signals, data length, method of character estimation and the number of times of EEG signals recording to calculate the arithmetic mean of EEG signals) to evaluate the performance of the spelling device. As a result, the accuracy rate increased with channel C4 or P4. However, there were individual differences in the proper channel to control the device.View full abstractDownload PDF (445K) -
Ippei NEGISHI, Haruki MIZUSHINA, Hiroshi ANDO, Shinobu MASAKIArticle type: Article
Session ID: HI2012-58/3DIT2012-2
Published: February 28, 2012
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWe measured the latency of P-100 (positive peak around 100msec) in Visual Evoked Potential (VEP) before and after visual tasks in 3D presented or real spaces. The latencies of P-100 extended after the tasks both in 3D presented and real spaces. This result suggests that the extension of the latency of P-100 reflects only the visual fatigue by vergence eye movement, which is not 3D-specific factor.View full abstractDownload PDF (488K) -
Kei NAKAGAWA, Takeshi KOHAMA, Hisashi YOSHIDA, Sho KIKKAWAArticle type: Article
Session ID: HI2012-59/3DIT2012-2
Published: February 28, 2012
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSIn this study, we analyzed fixation eye movements immediately after watching certain length of movie contents which contain some factors to induce motion sickness. Motion sickness is defined as nausea, dizziness, vomiting and related symptoms caused by repetitive viewing of highly tremble movies. This symptom is caused by visual exposure; however, there is no evidence that motion sickness affects the dynamics of fixation eye movements. We apply a microsaccade rate analysis, a fluctuation energy analysis, and a random walk analysis to fixation eye movements for the purpose of evaluate the effects of motion sickness on the behavior of subjects objectively. The results show that the microsaccade rate and the fluctuation energy defined by root mean square of eye movements increase, and the dispersion of two-dimensional fixation paths varies widely in connection with deterioration of the symptoms. These results suggest that fixation eye movements could be a quantitative measure of motion sickness.View full abstractDownload PDF (683K) -
Tatsuro TANAKA, Takeshi KOHAMA, Hisashi YOSHIDAArticle type: Article
Session ID: HI2012-60/3DIT2012-2
Published: February 28, 2012
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSIt is well known that decline of arousal level causes of poor performance of movements or judgments, while doing VDT work, driving cars, and so on, and also reduces productivity and safety. Previous studies show the slow eye movements (SEM) could be a candidate for an indicator of decline of arousal. However, since SEMs appear just prior to sleep onset, it is not sufficient to evaluate transition of arousal states. In this study, we examine the effects of the transition of arousal on microsaccade rate and pupil fluctuation while subjects are continuously gazing a fixation crosshair. The subjects are instructed to indicate by mouse-licks when they are aware of having slept. The eye movement and pupil fluctuation data are analyzed for the former period from SEMs, which are detected immediately before the mouse-clicks. The results show that longitudinal miosis of pupil diameter and gradual rise of microsaccade rate are observed in advance of the occurrence of SEMs. These resu Its suggest that the arousal level could be evaluated by monitoring eye movements and pupil fluctuations.View full abstractDownload PDF (651K) -
Takuya FUKUOKA, Takeshi KOHAMAArticle type: Article
Session ID: HI2012-61/3DIT2012-3
Published: February 28, 2012
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSIn this study, we performed a simulation experiments using a mathematical model of retina considering peripheral characteristics to evaluate the influence of fixation eye movements. Recent studies indicate that drifts and tremor enhance particular spacial frequency components, and microsaccades emphasize the difference of contrast on the visual stimuli. However, the influence of fixation eye movements on the retina, especially on the peripheral retina, is not elucidated. The proposed model considers the distribution function of cone cells and reproduces the property of increase in the size of peripheral receptive fields of ganglion cells. The simulation results show that drifts and tremor enhance the response of ganglion cells for high spatial frequency input, and microsaccades enhance the response for low spatial frequency inputs. These trends are more prominent for in the M-type ganglion cells at some distance from fovea. Furthermore, it suggests that fixation eye movements might derive a synchronous fluctuation on the response of ganglion cells.View full abstractDownload PDF (1072K) -
Takahiko FUKINUKIArticle type: Article
Session ID: HI2012-62/3DIT2012-3
Published: February 28, 2012
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSStripes which look almost the same do look different depending on trivial differences. They have been studied by psychologists (and by brain scientists). These are, however, analyzed by signal processing on visual perception. In this paper, newly discovered phenomena (appearance of moving stripes) by spatial motion-inducing markers are shown, and the future ways of studies are suggested.View full abstractDownload PDF (1274K) -
Article type: Appendix
Pages App1-
Published: February 28, 2012
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (84K) -
Article type: Appendix
Pages App2-
Published: February 28, 2012
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (84K) -
Article type: Appendix
Pages App3-
Published: February 28, 2012
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (84K)
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