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Displaying 1-17 of 17 articles from this issue
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Article type: Cover
Pages Cover1-
Published: November 29, 2013
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (10K) -
Article type: Index
Pages Toc1-
Published: November 29, 2013
Released on J-STAGE: September 21, 2017
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Ryo NISHIJIMA, Takehiro NAGAI, Yusuke TANI, Kowa KOIDA, Michiteru KITA ...Article type: Article
Session ID: HI2013-62
Published: November 29, 2013
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWe examined the spatial frequency characteristics of the relationship between skew of the sub-band filter outputs and gloss perception. We performed two experiments to measure the effects of the adaptation to skew on perceived gloss. Both results showed that the effect of skew adaptation varied by the spatial frequency of the adaptation stimulus. These suggested that gloss perception depend on the skew of particular sub-bands. Furthermore, we performed the rating experiment to investigate the relationship between sub-band skews and perceived gloss. The result showed the similar spatial frequency dependency of perceived gloss. We concluded that human visual system uses sub-band skews to estimate the surface gloss.View full abstractDownload PDF (10243K) -
Toshiki MATSUSHIMA, Kowa KOIDA, Takehiro NAGAI, Yusuke TANI, Michiteru ...Article type: Article
Session ID: HI2013-63
Published: November 29, 2013
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSTo investigate the characteristic of visual perception of surface qualities, we quantified perceptual surface qualities and observed image statistics, and considered the relationship between them. The samples were size- and shape-controlled glasses, metals, stones, woods, plastics, leathers, and fabrics. In the experiment, the participants rated each samples on a seven-level scale for each of nine perceptual surface quality features. Canonical correlation analysis was applied to the rating results and image statistics of each sample. The results showed that the cumulative redundancy of canonical variables made by image statistics, which was an index how explain the rating result by image statistics, was about 70 percent. The results showed that suitably selected image statistics can almost explain the perceptual surface quality. Furthermore, the canonical scores made by such selected image statistics were clustered individually each materials.View full abstractDownload PDF (6764K) -
Yusuke SAKURAI, Katsunori OKAJIMAArticle type: Article
Session ID: HI2013-64
Published: November 29, 2013
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSIt has been clarified that luminance information is a critical cue for estimating freshness of vegetables. However, the effect of chromaticity information has not been well studied. Therefore, we conducted an experiment on freshness perception by manipulating chromaticity information of vegetables' images systematically with a color calibrated monitor. The results support the theory in which freshness perception of vegetables depends on only luminance information of the surface. On the other hand, it was suggested that unordinary surface color of vegetables modulates freshness perception in some case.View full abstractDownload PDF (4908K) -
Tomoharu SATO, Takehiro NAGAI, Shigeki NAKAUCHIArticle type: Article
Session ID: HI2013-65
Published: November 29, 2013
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSChromatic representations in the visual system beyond the cone-opponent level are still unclear. We applied the classification image (CI) method to examine the effects of heterochromatic noise on perception of chromatic contrast. The obtained data were analyzed by logistic regression on the basis of chromatic mechanism models, not just by the typical CI analysis procedure. The stimulus was a superposition image of two uniformly colored squares at left and right (a signal image) and a multicolored texture (a noise image) whose colors were randomly chosen. Observers judged the relative chromatic contrast of the two signal squares on different noise textures. The model analysis suggested that the cardinal-mechanisms model was enough to explain our experiment data just by adjusting the relative sensitivities between the mechanisms.View full abstractDownload PDF (6877K) -
Masashi NAKAJIMA, Yoko HIROHARA, Mariko KOBAYASHI, Toshifumi MIHASHIArticle type: Article
Session ID: HI2013-66
Published: November 29, 2013
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWe developed an instrument for measuring the longitudinal chromatic aberration (LCA) in three different wavelengths (561, 690, 840 nm) using Shack-Hartmann wavefront aberrometer. Switching three light sources consecutively, we can measure the LCAs of the human eyes precisely. The wavefront aberration is calibrated by using a reflecting model eye which has no chromatic aberration in principle and by using a ISO model eyes, of which lens designs were known. We confirmed that the longitudinal chromatic aberration of the human eyes can be measured with this method.View full abstractDownload PDF (376K) -
Ken ISHIBASHI, Kazunori MIYATAArticle type: Article
Session ID: HI2013-67
Published: November 29, 2013
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThis paper reports a novel statistic-based interactive evolutionary computation (IEC) method for color scheme search. Our proposed method has two contributions: 1) to reduce the computing cost, and 2) to maintain the overall color scheme impressions. In addition, this study uses four similarity search (SS) functions on the basis of hue, saturation, brightness and color differences. Through two experimental evaluations, we affirmed that a system using our method and four SS functions enables users to find their desired color scheme in less than 50 sec, and users can get some favorite re-colored illustrations by the color transfer function.View full abstractDownload PDF (4434K) -
Wataru MANO, Suguru SAITOArticle type: Article
Session ID: HI2013-68
Published: November 29, 2013
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSCharacter motion in hand-drawn animations are illustrated by unrealistic way. However, we seldom mind the difference between the real motion and the animation. It means that drawings are not simple projections of 3DCG models while those do not give uncomfortable feelings to us. In this report, we introduce a program to analyze the drawing of faces of animated characters by using feature points. We also show the results of the analysis of differences between hand-drawn animation and 3DCG model projection.View full abstractDownload PDF (13884K) -
Keiko KUWAMURA, Masayuki SATO, Keiji UCHIKAWAArticle type: Article
Session ID: HI2013-70
Published: November 29, 2013
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSMagnitudes of attentional influence on chromatic and achromatic channels were examined using a dual-task paradigm. In experiment 1, the observer should pay attention to rings presented in the central visual field to answer the question about the number of gaps in the rings. This attentional load reduced the sensitivity to chromatic target much but influence to achromatic response was limited. These tendency did not depend on the color of the rings. In experiment 2, chromatic and/or achromatic discrimination tasks were performed in the central and peripheral visual field simultaneously and thresholds were compared to those obtained when the observer pay attention solely to either task. It was found that threshold elevation was prominent when chromatic and achromatic tasks were combined, suggesting that it is difficult to pay visual attention to chromatic and achromatic targets simultaneously.View full abstractDownload PDF (8048K) -
Kei ISHIGURO, Kazuho FUKUDA, Keiji UCHIKAWAArticle type: Article
Session ID: HI2013-72
Published: November 29, 2013
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWe examined whether differences in expressions affect occurrence of facial-expression-contingent color aftereffects. There were problems of comparisons of differences in adaptation effects between facial expressions in our past studies, therefore we improved method of the experiments in order to compare these differences. Subjects adapted angry-red and happy-green, and we compared changes of color appearance between pre-adaptation and post-adaptation. Although adaptation color was different between facial expressions, aftereffects occurred in the direction of green in both facial expressions. There were no significant differences in the sizes of these aftereffects between facial expressions, and no aftereffects occurred when only test stimuli were changed to mosaic pictures and adaptation stimuli were not changed. These results show that contingent color aftereffects occurred not for facial expressions but for faces.View full abstractDownload PDF (3431K) -
Yuki KAWASHIMA, Yuki NIKAIDO, Yasuki YAMAUCHI, Masakatsu HIRASAWA, Tak ...Article type: Article
Session ID: HI2013-74
Published: November 29, 2013
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSOne of the most important characteristics of organic electroluminescent (OLED) lighting is that it is a 2-dimensional surface-emitting device. Non-uniformity of the luminance distribution on an OLED panel is, however, easily detected. Therefore, it is important to find characteristics of the luminance uniformity perception for the performance evaluation of OLED panel. In this study, we investigated characteristics of the luminance uniformity perception on different luminance patterns. In an experiment, we measured subjective magnitude of luminance uniformity using visual stimuli with luminance gradient patterns similar to OLED panels. The results showed that the perceptual uniformity linearly decreased as the luminance gradient increased. In addition, luminance gradients that gave the same perceptual uniformity on different luminance patterns were also measured. The results showed that such luminance gradients were largely different depending on the luminance patterns.View full abstractDownload PDF (3657K) -
Eiji WATANABE, Takashi OZEKI, Takeshi KOHAMAArticle type: Article
Session ID: HI2013-75
Published: November 29, 2013
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSIn this paper, we discuss the analysis of the interaction between the lecturer and audience in the lecture by using multi-layered neural networks. Here, we adopt the following features as behaviors by lecturer and audience; face and head movement by lecturer, and face movement by audience. The relations among the above features concerning on the behaviors by the lecturer and audience can be approximated by multi-layered neural networks. Furthermore, we use a learning method with forgetting for neural networks for the purpose of extraction of rules. Finally, we have analyzed the interaction between behaviors by lecturer and audience based on the internal representations in multi-layered neural networks for a real lecture.View full abstractDownload PDF (7385K) -
T. Mihashi, S. Miyagawa, Y. Hirohara, Takao Endo, Hiroyuki Kanda, Tomo ...Article type: Article
Session ID: HI2013-76
Published: November 29, 2013
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSTo investigate the control and mechanism of accommodation, we have measured accommodation and higher order aberrations with a compact wavefront aberrometer before/after the short ciliary nerves of anesthetized cats were electrically stimulated. We stimulated the lateral branch, medial branch and both of the branches of the short ciliary nerve between the ciliary ganglia and eye. In this study, using principle component analysis, accommodation was induce by the both stimulation and the oblique astigmatism with different axes were induced by the lateral and medial stimulations respectively.View full abstractDownload PDF (3067K) -
Article type: Appendix
Pages App1-
Published: November 29, 2013
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (81K) -
Article type: Appendix
Pages App2-
Published: November 29, 2013
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (81K) -
Article type: Appendix
Pages App3-
Published: November 29, 2013
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (81K)
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