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RISS 인기검색어
- 검색키워드
- 저자 : Midori Tanaka (검색결과 4 건)
- 무료
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Contribution of ipRGC to the Fluorescent Feeling
Yuki Tanaka,Keita Hirai,Midori Tanaka,Takahiko Horiuchi,Katsunori Okajima 한국색채학회 2017 AIC 2017 Jeju Vol.2017 No.10
Fluorescence is generated when a substance absorbs light energy at a short wavelength and then emits light energy at a longer wavelength. This unique characteristic evokes a “fluorescent feeling,” which is different from the perception that is detected when objects reflect light. In our previous study, when an image that was colorimetrically equivalent to a real fluorescent object was reproduced on a monitor, the fluorescent feeling evoked by the reproduced image was reduced. This suggested that the differences in spectral distribution between a reproduced image and a real fluorescent object can affect the fluorescent feeling. In recent years, the role of intrinsically photosensitive retinal ganglion cells (ipRGCs) in the detection of brightness has been reported. In this study, we investigate the contribution of ipRGCs to the fluorescent feeling. In our experiment, ipRGC stimulation was tested and compared to the light flux stimulus. We investigated both central vision and peripheral vision. We found that as ipRCG excitation increased, the participants perceived a larger fluorescent feeling. In addition, a large fluorescent feeling was perceived in the peripheral vision, where ipRGCs play a prominent role in image detection. These results indicate that ipRGCs are important for the development of the fluorescent feeling.
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A Memory Effect in Metallic Material Perception
Paru Kondo,Midori Tanaka,Takahiko Horiuchi 한국색채학회 2017 AIC 2017 Jeju Vol.2017 No.10
In color memory matching, it is well known that the perceived color might be different from the original color even if the viewing conditions remain the same. In our previous study, we found that such color shifts also occurred with metallic gold objects. Appropriate luminance modulation was an important factor in the highfidelity perception of the rendered images of gold materials. In this study, we further investigate the memory effect by using actual metallic objects with four different metallic colors (brass, copper, bronze, and iron) having similar 3D shapes. As experimental stimuli, we prepared nine images for each metallic object, including one nonmodified image and eight processed images with modulated luminance and saturation. In our psychophysical experiment, the images were displayed on a calibrated monitor and evaluated with regards to the fidelity of image reproduction through paired comparison in a memory matching procedure. By analyzing the results of principal component scores, it was found that the saturation shift and luminance enhancement corresponded to the 1st and 2nd principal component vectors.
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Changes of Pupil Size during Colored Texture Observation
Ryusuke Arai,Midori Tanaka,Takahiko Horiuchi 한국색채학회 2017 AIC 2017 Jeju Vol.2017 No.10
The pupil size has been studied for cognitive processing of visual information. It is known that the pupil size is primarily controlled by the physical characteristics of the visual stimulus (illuminance of viewing environment) and psychological variables (e.g. interest, memory, and emotional awakening) during observation. However, the relationship between physical and psychophysiological characteristics during observation of appearance on the object surface has not been fully investigated. In this study, we investigate how the pupil size changes when human pay attention to the material appearance such as glossiness, roughness and colorfulness. In our psychophysiological experiment, we used seven colored fabrics with the same surface texture of canvas as experimental stimuli. The participants were asked to observe the experimental stimuli according to two different observation points. During the first half, participants looked out the entire experimental stimulus idly for investigating the effect by physical characteristics of viewing environment. During the second half, they carefully observed the surface appearance of physically the same stimulus for investigating psychophysiological characteristics. As a result, the pupil size reduced during the second half. In addition, it was found that the contraction rate of the pupil size depending on the saturation of the object surface.
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