ITE Technical Report
Online ISSN : 2424-1970
Print ISSN : 1342-6893
ISSN-L : 1342-6893
35.16
Showing 1-39 articles out of 39 articles from the selected issue
  • Type: Cover
    Pages Cover1-
    Published: March 08, 2011
    Released: September 21, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • Type: Index
    Pages Toc1-
    Published: March 08, 2011
    Released: September 21, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • Takuya KUME, Fausto LUCENA, Hiroaki KUDO, Noboru OHNISHI
    Type: Article
    Session ID: HI2011-29/3DIT2011-1
    Published: March 08, 2011
    Released: September 21, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    Heart rate variability (HRV) have been used to show the variations of the autonomic nervous system (ANS) activity. In practice, short-time Fourier transform (STFT) and wavelet transform (WT) are used as time and frequency technique to estimate changes in the power spectra of HRV. As a problem, however, it is that these methods are limited that they use fixed basis function which required a prior knowledge about the data. On the other hand, independent component analysis (ICA) learns basis functions based on the statistical characteristics of the data. In this paper, we examine whether HRV basis functions trained by ICA are useful or not to evaluate the ANS variations. In the psychological experiment, we applied learned basis functions to analyze HRV while watching a video by 2D and 3D display. We obtained the results that suggest basis functions learned by ICA are an effective way to represent changes in LF/HF of HRV power spectra comparing to STFT.
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  • Yasunori DOI, Tetsuya MATSUMOTO, Yoshinori TAKEUCHI, Hiroaki KUDO, Nob ...
    Type: Article
    Session ID: HI2011-30/3DIT2011-1
    Published: March 08, 2011
    Released: September 21, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    We propose a system to provide the blind with the merchandise information of store shelves and to guide them to the merchandise. There are some problems of store-shelf-label recognition: (1) a variety of label types, (2) complex background, (3) color similarity between label and background, (4) label overlapping, (5) associating the name of the commodity with the price. We propose a store-shelf-label recognition method. The method uses label elements and label models. The system provides the merchandise information by synthesized voice. Experimental results for 35 images indicate satisfactory performance to the problems.
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  • Fukashi Ohata, Yoshinori Takeuchi, Tetsuya Matsumoto, Hiroaki Kudo, No ...
    Type: Article
    Session ID: HI2011-31/3DIT2011-1
    Published: March 08, 2011
    Released: September 21, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    We propose a method for segmenting a color image into object and background regions by a computer. The task of the method is extracting unknown objects which consist of some color regions without any help of users. The image is initially segmented into small regions by k-means clustering. Next, small regions are repeatedly merged by five merging rules. The merging rules are based on information about positional relationship or shape of small regions, and "the degree of focus" showing whether the region was in focus or not when the picture was taken. We conducted experiments with actual images to compare to the conventional method which has the similar problem setting. The results show that the proposed method is better in terms of the precision of boundaries.
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  • Hitomi KONNO, Terumasa AOKI
    Type: Article
    Session ID: HI2011-32/3DIT2011-2
    Published: March 08, 2011
    Released: September 21, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    Recently, skereton-based animation is mainly used for 3D computer graphics. In this paper, we propose a new skeletonization method based on automatic joint position estimation using gauss spheres for 3D articulated models. The proposed method realizes a high-quality and easier skeletonization.
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  • Tomoki SHIOMI, Hiroki Hori, Keita UEMOTO, Asei SUGIYAMA, Masaru MIYAO
    Type: Article
    Session ID: HI2011-33/3DIT2011-2
    Published: March 08, 2011
    Released: September 21, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    There are concerns about how a viewer is affected by viewing 3D video. Some of the harmful effects include eye fatigue, headache, and 3D sickness including nausea. The mechanisms that cause these symptoms remain incompletely understood. It is often said that during virtual 3D vision, while accommodation is fixed at the display, the directions of convergence of the two eyes intersect at the location of the stereo image. Hence, accommodation and convergence do not coincide with each other in this case. In this study, we aimed to check whether this inconsistency exists or not, for which we simultaneously measured accommodation and convergence in subjects gazing at real objects, 2D images, and 3D images. We measured accommodation and convergence in natural vision successfully. We also confirmed that accommodation is not fixed at the display, but coincides with convergent focus when gazing 2D and 3D images.
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  • Ryohei P. Hasegawa
    Type: Article
    Session ID: HI2011-34/3DIT2011-2
    Published: March 08, 2011
    Released: September 21, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    There is recent world-wide interest in developing brain-machine interfaces (BMIs) as advanced assistive technologies. In this talk I will introduce "neurocommunicator", which is a brand-new cognitive BMI system developed by AIST.
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  • Teruhiko YAMASHITA, Takeshi KOHAMA, Yoshimi KAMIYAMA
    Type: Article
    Session ID: HI2011-35/3DIT2011-2
    Published: March 08, 2011
    Released: September 21, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    In this study, we propose a mathematical model of the saccadic eye movement system based on the neuronal network characteristics of the substantia nigra pars reticulata (SNr), the intermediate layer of the superior colliculus (SC), and the brainstem neurons, all of which are deeply involved in the generation of saccades. The frontal eye field (FEF) is involved in the planning of the direction and amplitude of saccades, and the SC is involved in the generation of the commands for saccades and transmits them to the brainstem; subsequently, the ocular muscles contract to produce saccades. These cortices contain many functionally distinct cell types such as fixation neurons, buildup neurons, and burst neurons. The fixation neurons discharge while maintaining fixation. The buildup neurons become active during the preparatory stages of saccadic eye movements, and the burst neurons become active while executing the saccades. The firing properties of these types of cells have been well described. However, detailed information regarding their network, that is, how they communicate with each other through neural pulses, is not available. Our model can reproduce the properties of neural responses of saccade-related areas in express saccade tasks. In addition, the model can also reproduce the activity of the intermediate-layer neurons of the SC in antisaccade tasks. These results indicate the validity of the mathematical model for the mechanism underlying saccade generation.
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  • Kuniko IRIE, Takeshi KOHAMA
    Type: Article
    Session ID: HI2011-36/3DIT2011-2
    Published: March 08, 2011
    Released: September 21, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    In this study, we conducted a numerical detection task involving the number of gaps in double rings, with dynamic random dot displays used as background motion stimuli. We controlled the intensive level of attention by regulating the contrast between the target rings and distractor rings. The task performance rates of the subjects were estimated as a relation of the percentage of coherence dots. Furthermore, we measured fixation eye movements during the tasks and analyzed the influence of subthreshold coherent motion information on involuntary eye movements such as microsaccades. Subthreshold coherent motion was found to deteriorate performance with regard to counting the gaps in the rings and the frequency of microsaccades regardless of the intensive level of attention concentration. This indicates that even if the top-down processes are sufficiently effective, bottom-up motion information can affect the control of attention and eye movements.
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  • Taiki GOCHI, Takeshi KOHAMA
    Type: Article
    Session ID: HI2011-37/3DIT2011-2
    Published: March 08, 2011
    Released: September 21, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    Previous saliency-based visual attention models dealt with the mechanism underlying attentional shifts in the early visual system. Such models can predict the distribution of gaze movements on the basis of saliency maps (Itti & Koch, 2000). Saliency maps are calculated on the basis of the distribution of color in and the orientation of input images. In recent studies, saliency-based models were modified to predict the gaze positions for moving objects. The data from psychophysical experiments indicate that singletons defined by depth easily pop out, indicating that the saliency of depth information is implicated in visual information processes. However, depth information is not considered in the calculations for saliency maps. In this study, we modified a saliency-based model with regard to using depth information for calculating the saliency map and deciding the gaze position. Our model can discriminate each object in the visual scene by referring to the region of shared depth and shift the gaze points from object to object on the basis of depth saliency. We analyzed the results for the visual search tasks in which some objects distributed to the depth space and obtained the scan order of objects by tracking the mouse cursor. The predicted scan orders for objects were found to be very similar to those obtained in the experimental results for the early selection phase. This indicates that the saliency of depth information may play an important role in visual search in depth space.
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  • Keisuke SUGIMOTO, Takeshi KOHAMA
    Type: Article
    Session ID: HI2011-38/3DIT2011-2
    Published: March 08, 2011
    Released: September 21, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    In this study, we formulated the activity of the lateral intraparietal (LIP) area neurons in the posterior parietal cortex, which controls the allocation of spatial attention. The LIP unit was integrated into the dorsal process of Hamker's model. We modified the dynamics of the frontal eye field (FEF) in the prefrontal cortex of the model in order to control the trigger for engaging or disengaging the focus of spatial attention; we assumed that the FEF is one of the pivotal areas for the inhibition of return (IOR) to the most recent fixation position. Our model reproduced the responses of the LIP neurons and oculomotor scanning behavior during the visual search tasks. The target detection rate of our model was 72%; the simulated scan paths obtained using our model closely resemble the experimental data obtained in monkeys.
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  • Hiroko MITARAI, Atsuo YOSHITAKA
    Type: Article
    Session ID: HI2011-39/3DIT2011-2
    Published: March 08, 2011
    Released: September 21, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    Visual information can express nonverbal information, however, certain knowledge and techniques are required to utilize it. Film and video production professionals express affective information effectively using production techniques like film grammar. In this paper, based on a shooting experiment by nonprofessional users, interactive cinematographic support system is proposed. This system utilizes capturing images and surrounding information such as pitch angles of the video camera, and assists users to express affective information. It was evaluated that it assists the users to express affective information at some degree.
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  • Tatsuya FUJIKAWA, Masahiko NAWATE
    Type: Article
    Session ID: HI2011-40/3DIT2011-2
    Published: March 08, 2011
    Released: September 21, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    We investigated whether attention on both changes of geometric figures drifting in the screen and sentences scrolling along the screen of the screen edges depend on the screen size, using displays of which sizes were 15 and 4 inches. There were not significant difference in accuracy rate of sentences and detection of figure change between 15 and 4 inches display. Most of participants answered that conspicuous display was 15 inches in subjective assessment. However, some participants exhibited better record for 4 inches than 15 inches on chacges of geometric graphics.
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  • Takafumi UCHIDA, Shino IWASHITA
    Type: Article
    Session ID: HI2011-41/3DIT2011-2
    Published: March 08, 2011
    Released: September 21, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    The aim of this paper is to analyze the difference of eye fixation characteristics during Web Browsing according to following three points: 1) experience of browsing, 2) interest for the Web page, 3) layout. The point-of regard of each subject is measured while s/he finds the given target in the image of a Web page. A questionnaire is conducted to obtain the experience of browsing and degree of interest for the Web page. The result of analysis indicated that the capability of search is different but the search speed is not different depending on the experience and interest. Another result indicated that the simple layout enable the subjects to search the target fast.
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  • Toshiki SHIROI, Shino IWASHITA
    Type: Article
    Session ID: HI2011-42/3DIT2011-3
    Published: March 08, 2011
    Released: September 21, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    We conducted a subject experiment to compare the effect of information media for memorizing a name. Three media, i.e., visual display, a name card, and voice are prepared for expressing the name. A face is paired with the name, and four faces are combined as a group. The faces in a group are all men, all women or mixed. After subjects memorize the name of the faces in a group, they answer each name of the faces sorted randomly. The percentage of questions answered correctly is comparatively analyzed. The result of the experiment makes it clear that there is little to distinguish the difference of media for memorizing a name, while there is a difference how to mistake. It is also clear that the name presented first makes big impression, while the one presented last is correctly remembered.
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  • Keisuke Nakamura, Manami Tanaka, Kanae Suzuki, Nobuo Ezaki, Kazuyuki I ...
    Type: Article
    Session ID: HI2011-43/3DIT2011-3
    Published: March 08, 2011
    Released: September 21, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    We have been studying about medical data storing system as a part of development of electronic medical chart storing system in National Rehabilitation Center for Persons with Disabilities. In this paper, we conducted evaluation experiment on storing method of interview sheet data on Web page and by using pen-input, assuming of interview situation on "Riryo" training. As for the construction of the Web page, most of examinees could feed the data into right area. And they also can do the same things by using pen-input. So we confirmed the effectiveness of this system from the experiment results. But the problems, very occasionally, are not to register the described contents and not to recognize accurately by this system. Therefore we will examine the corrective strategy.
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  • Masaki Sugimoto, Kazufumi Nakai, Nobuo Ezaki, Kimiyasu Kiyota
    Type: Article
    Session ID: HI2011-44/3DIT2011-3
    Published: March 08, 2011
    Released: September 21, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    In this paper, we proposed an input method of Japanese sentence by using Wiimote for character input method. Wiimote has 3D accelerate sensor, therefore a user write a character in the air, our system can recognize a written character. We are using two recognition methods using only real-stroke. The recognition rate was 78.9% and 98.7% in 10 candidates. And, we adapt the error correction methods by using n-gram model. The recognition accuracy of the 1^<st> candidate phrase by using bi-gram was 91.7%.
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  • Eiji WATANABE, Takashi OZEKI, Takeshi KOHAMA
    Type: Article
    Session ID: HI2011-45/3DIT2011-3
    Published: March 08, 2011
    Released: September 21, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    In taking hand-written memorandum, the taking process plays often important roles for recalling related information in addition of notations (words and figures) in the memorandum. In this report, we focus on the process through taking hand-written memorandum. Here, we propose image processing methods for embedding time tag in handwritten memorandum by using sunglasses type camera.
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  • Masaaki NODA, Shun'ichi TANO, Junko ICHINO, Tomonori HASHIYAMA, T ...
    Type: Article
    Session ID: HI2011-46/3DIT2011-3
    Published: March 08, 2011
    Released: September 21, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    We propose an input method for digital device with the specific wheel device, Active wheel. We first analyze user interfase of several consumer electronics devices, such as TV, Video recorder, and PC, and then classify data manipulation for these devices. We next study two key factors, which are pitch and importance, to provide an appropriate force feedback to users for a variety of electronics devices using the wheel. Based on this study, we develop a new architecture, which enables user interface designers to get a value set for the appropriate force feedback. Our prototype system on the proposed architecture was evaluated in initial user study at the three types of electronics devices user interfaces and the results were positive.
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  • Yasuomi HATTORI, Kazuho FUKUDA, Keiji UCHIKAWA
    Type: Article
    Session ID: HI2011-47/3DIT2011-3
    Published: March 08, 2011
    Released: September 21, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    We examined whether contingent color aftereffect occurred for facial expression. Our previous research found no significant contingent color aftereffect when the chromaticity of happy or angry face grayscale image homogenously changed along red-green color axis as adaptation stimuli. In this study, we obtained significant aftereffect with a different method of face color modification where larger chromaticity shift was given for the pixel with higher saturation, such as the change in the natural color of face. In the adaptation phase, the observers adapted to the color and facial expression correlation with red-angry faces and green-happy faces. The color appearances of face images were compared between the pre- and post-adaptation phases to test any contingent color after effects. The results showed a significant difference in color appearance between the two phases. This ensures that the contingent color aftereffect occurred for happy and angry facial expressions, suggesting an involvement of sensory mechanisms for facial expression in color perception.
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  • Ai NUMATA, Kazuho FUKUDA, Keiji UCHIKAWA
    Type: Article
    Session ID: HI2011-48/3DIT2011-3
    Published: March 08, 2011
    Released: September 21, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    Color appearance can be classified into two modes, the surface-color mode and the illuminant-color mode. We measured the luminance limit, defined by the luminance of the test stimulus when its appearance transitions from the surface-color mode to the illuminant-color mode, using surrounding stimuli having the distribution of luminance and chromaticity of natural surfaces. These surrounding stimuli consisted of a random pattern of overlapping circles. We aimed to determine what degree of the relationship exists between the luminance limits of colored light to appear as surface and the luminance distribution of natural surfaces. As a result, the luminance limit for the surface-color mode turned out to be similar to the upper limit of the luminance distribution of natural surfaces. Also, it shifted in the same chromatic direction as the chromaticity shift of an illuminant.
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  • Xin WANG, Masayuki SATO, Yasuaki TAMADA
    Type: Article
    Session ID: HI2011-49/3DIT2011-3
    Published: March 08, 2011
    Released: September 21, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    When a visual target blanks for a while immediately after a saccade, saccadic suppression of image displacement is degraded (blanking effect). Our previous study showed that the blanking effect diminished for an isoluminant red-green target. However, it is not clear whether color is a critical factor affecting the blanking effect because apparent contrast of a white target on a gray background used in a control condition was much higher than that of the color target. The present study examined the effect of target contrast and concluded that the blanking effect was more prominent for a luminant target than a color target when their apparent contrasts were the same, suggesting that the luminance information has more important role than the color information in visual stability across saccadic eye movements.
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  • Yasuaki TAMADA, Masayuki SATO
    Type: Article
    Session ID: HI2011-50/3DIT2011-3
    Published: March 08, 2011
    Released: September 21, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    When binocular disparity and motion parallax are presented simultaneously, very large depth is perceived for diplopic images with very large disparity. This study examined the dependency of this depth facilitation on the direction of observer's head movement. The test stimulus was a dot presented 2.5 deg above or below the fixation point with binocular disparity and/or motion parallax. The observer responded the apparent depth of test stimulus relative to the fixation point with a matching method while moving his/her head laterally or sagitally. In exp 1, the range of observer's head position was 13cm. In exp 2, the ranges of head position were 1.8cm and 50cm for lateral and sagital movements respectively, so that the ranges of stimulus motion were the same. The results showed that the facilitation occurred for lateral head movement but not for sagital movement in both experiments, suggesting that the facilitation is specific to lateral stimulus motion.
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  • Suguru SAITO
    Type: Article
    Session ID: HI2011-51/3DIT2011-3
    Published: March 08, 2011
    Released: September 21, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    For real paint, there are problems that it contains poison materials and becomes deteriorated. On the other hand, digital paint on computer is free from such problems and allows higher saturation color with recent display hardware whose gamut is very wide. However, we need to implement a lot of aspects of paint as material, because various painting techniques are based on them and painters are often inspired by them. I describe our works about it.
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  • Akitoshi OGAWA, Atsushi IRIKI
    Type: Article
    Session ID: HI2011-52/3DIT2011-4
    Published: March 08, 2011
    Released: September 21, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    In the decoding studies that decode perception and cognition from brain imaging data, the target was visual stimulus initially. The decoding candidate was incrementally expanded to not only auditory or somatosensory stimuli but also cognitive process (e.g. attentional shift). This study aimed at constructing the decoder that discriminated inferences from base relations by using fMRI imaging data. The subjects were trained on base relations before scans and then performed the inference task in the MRI scanner. The result showed that the decoder discriminate inferences from base relations, suggesting the brain area that encoded the information to discriminate whether the subjects inferred.
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  • Tatsuroh MASHITA, Ko SAKAI
    Type: Article
    Session ID: HI2011-53/3DIT2011-4
    Published: March 08, 2011
    Released: September 21, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    We examined the essence of the receptive-filed properties of V4 neurons from the view point of information, specifically whether the coding of V4 neurons is in a form of sparse representation. The component analyses with the constraint of sparseness were applied to the image patches that simulated the responses of either V1 or V2 neurons for natural images. With the image patches that corresponded to the outputs of V2 neurons, we obtained a set of basis functions that were selective to contours with particular curvatures, which is similar to V4 receptive-fields. The result suggests the significance of sparse coding in the representation of V4 neurons, and the importance of afferent inputs from V2 in the formation of the V4 receptive-filed property.
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  • Osamu WATANABE, Hikaru YAMADA
    Type: Article
    Session ID: HI2011-54/3DIT2011-4
    Published: March 08, 2011
    Released: September 21, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    The human visual system processes visual information hierarchically, that is, local visual features such as line orientations are extracted in early visual areas, and then complex patterns are recognized in higher cortical areas by integrating these local feature segments. On the other hand, it is known that, as well as the bottom-up hierarchical connections, there are top-down connections from the higher visual areas to the lower-order areas in the brain. There are many computational models that explain the computational role of the bi-directional connections, and many of them suggest that the visual system predicts an input stimulus via the top-down connections and corrects the recognition error. Here we examine the property of the human pattern recognition with masked visual search paradigm. The result showed that the reaction times (RT) were modulated by the mask stimuli, and the RT modulations depended on the types of mask pattern. This result suggests that the existence of the prediction-correction process in the pattern recognition system.
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  • Takahiko FUKINUKI
    Type: Article
    Session ID: HI2011-55/3DIT2011-4
    Published: March 08, 2011
    Released: September 21, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    By the inverse process that many visual phenomena have been analyzed in the spatio-temporal frequency domain, many new phenomena have been discovered: ATF (Appearing stripes in Translated Frames) in which stripes appear induced by auxiliarily added moving patterns and VTF (Vanishing stripes in Translated Frames) in which stripes vanish by auxiliarily added moving patterns. These show the validity of the methods adopted for the analysis in signal processing of visual perception.
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  • Kazuya MATSUBARA, Kazumichi MATSUMIYA, Satoshi SHIOIRI, Shuichi TAKAHA ...
    Type: Article
    Session ID: HI2011-56/3DIT2011-4
    Published: March 08, 2011
    Released: September 21, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    Stimuli with higher luminance contrast tend to be perceived closer in depth. In order to quantify this effect, we measured subjective depth on the test stimulus as a function of luminance contrast, using depth matching technique. The depth of a reference stimulus was matched to that of the test stimulus by changing the binocular disparity. To investigate a spatio-temporal characteristic of this effect, we varied the spatial frequency and temporal frequency of the test stimulus. The results show in all spatio-temporal conditions the test stimulus was perceived much closer when the luminance contrast was higher. To consider the mechanism of this effect consists of single or multi channels, we examined two models. The single channel model predicts better performance than the multi-channel model. Our results suggest that the subjective depth modulation from luminance contrast is processed by single channel mechanism.
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  • Kohei MASHIMO, Kazumichi MATSUMIYA, Ichirou KURIKI, Satoshi SHIOIRI
    Type: Article
    Session ID: HI2011-57/3DIT2011-4
    Published: March 08, 2011
    Released: September 21, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    Although variety of models of visual attention shift have been proposed, the ability to predict the shift of human attention, which is usually estimated from eye movements is limited. To improve models, it is necessary to include the effect of top-down processes. There is a report of an attention model that uses scene contexts evaluated based on global feature, a top-down cue to estimate the locations of gazes when searching targets such as persons. In this study, we added a process related to 3D visual perception to improve the model with contextual cueing.
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  • Kazuya OISHI, Noriko MURAKAMI, Masayuki KIKUCHI
    Type: Article
    Session ID: HI2011-58/3DIT2011-4
    Published: March 08, 2011
    Released: September 21, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    We measured the gaze at point of two generations of the young and the old when they had been drawing subjects. The motifs were images of a white paper cup, a patterned paper cup, and several closed curve. Subjects sketched each motif in three minutes during which gaze points had been measured. As a result, the senior subjects tended to performed short distances of saccades in comparison with the young fellow The result suggested having been drawing experience or not the young, for time to watching the subject for drawing was the difference, and the inexperienced group was getting long than the experienced group was not changing.
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  • Yoshiaki KOUNO, Masayuki KIKUCHI
    Type: Article
    Session ID: HI2011-59/3DIT2011-4
    Published: March 08, 2011
    Released: September 21, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    We performed psychophysical experiments using path-paradigm addressing whether 3D convex/concave contour was encoded in separate neurons or not. The stimulus element composed of two equilateral triangles that share one of their edges, and each triangle has dots in its inner region. The stimulus elements have 3D convex/concave structure with a bend. In experiment 1, we used three types of paths: homogeneous concave elements, homogeneous convex, elements, and alternation of convex I concave elements. The rest stimulus elements are arranged randomly. We obtained the result that subjects could not detect alternating path well. In experiment 2, we used only two types of paths: homogeneous concave elements, homogeneous convex, elements. Subject can detect well them equally. These results suggest that the visual system has separate neurons processing 3D convex/concave edges.
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  • Naoki YAMAMOTO, Akira UTSUMI, Kiyoshi FUJIMOTO, Shinji ABE, Noriyoshi ...
    Type: Article
    Session ID: HI2011-60/3DIT2011-4
    Published: March 08, 2011
    Released: September 21, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    We examine the relationships between brightness of on-vehicle display panels and visibility of both outside scene and display panels themselves. In experiments, subjects are instructed to perform target detection task with observing night driving scene (main LCD display) and target discrimination task (sub LCD displays) in alternate shifts with four different brightness setting conditions of sub displays, including gaze-reactive condition. As a result, Bright-Off condition (always high brightness) gives worst performance and, in contract, gaze-reactive control improves performance for detection task. Multi-level control of gaze-reactive brightness gives best performance. These results suggest that the impact of adaptation can be relaxed by using gaze-reactive brightness control.
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  • Masaru Kanazawa, Junji Nishigaki, Kazuhiro Takeuchi, Ryouzou Harada, T ...
    Type: Article
    Session ID: HI2011-61/3DIT2011-4
    Published: March 08, 2011
    Released: September 21, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    Subjective evaluations were conducted on screen size, brightness and contrast, aiming to display images with very high presence in dome theaters. It was found that large screen size effect decreases with dark and poor-contrast images. Display distortion was also investigated related to screen shape and it was found that distortion would be less with dome theaters than with flat screen.
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  • Kenichiro MASAOKA, Yukihiro NISHIDA, Masayuki SUGAWARA, Eisuke NAKASU
    Type: Article
    Session ID: HI2011-62/3DIT2011-5
    Published: March 08, 2011
    Released: September 21, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    We performed subjective assessments to quantify the sensation of realness of images at various angular resolutions and that of their real-object counterparts using a paired-comparison procedure. Both the images and real objects were viewed through a synopter, which removed horizontal disparity and presented the same images to both eyes. The size, perspective, luminance, and chromaticity of the images were reproduced to be identical to those of the real objects. Eighty-two observers with normal vision were asked to choose the viewed image that appeared closer to the real object for each pair. The results indicated that the realness of images increased as the image resolution steadily increased up to around 60 cpd (cycles per degree), whereafter it gradually approached that of the real objects.
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  • Type: Appendix
    Pages App1-
    Published: March 08, 2011
    Released: September 21, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • Type: Appendix
    Pages App2-
    Published: March 08, 2011
    Released: September 21, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    Download PDF (92K)
  • Type: Appendix
    Pages App3-
    Published: March 08, 2011
    Released: September 21, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    Download PDF (92K)
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