Psychological elementary colours in achromatic and chromatic stimuli were measured by the method of magnitude estimation under 1000lx D65 simulator illumination with an N6 gray background after 5 minutes adaptation. In experiment 1,sum of Blackness and Whiteness are less than 100 at every achromatic stimuli, however it ought to be equal to 100. The result suggests some of psychological elementary colours are suppressed in order to perceive alternative elementary colour clearly. In experiment 2,the amounts of six psychological elementary colours in viewing chromatic colours were measured by the magnitude estimation method in order to examine if it is possible to judge not ratios but the absolute amounts of elementary colours. Observing 211 chromatic colour papers, subjects estimated all the psychological elementary colours in the stimuli, in comparison with psychological elementary colours. The results showed that some chromatic elementary colours of stimuli increased linearly with Blackness and Whiteness, and that the sums of elementary colours included in each stimulus increased with the maximum value of Whiteness, Blackness and Chromationess. These results suggest that one elementary colour induces some others in chromatic colour percepts and that being perceived very strong, an elementary colour induced other one, and it makes the perception unstable.
Multimedia database management and retrieving are on a world-wide demand. In particular, Object Location and Tracking (OLT) technology in time-space is a core in a search engine of a huge multimedia database and has wide applications. The final target of our research is to establish technologies which enables to locate and track specified objects in video data from the combination of audio and visual cues. As human being is one of the typical objects, as the first step of our research this paper will be focused on location and tracking of a specified person in the audio domain. This paper describes OLT project, the speaker-based segment detection and junction algorithms and evaluation experiments using the simulated dialogue data, and segment Fuzzy search algorithm and its application to detection of variable length segment.
There are big differences in recognizing images between them when we see a stereogram under both conditions of crossed looking and uncrossed looking. The differences are kept, even when we see the stereogram by setting prism wear to one eye. This fact suggests that the differences are not caused in imbalance of centripetal code of eye muscles occurred by sizes of vergence. Therefore we propose that the differences are make on one of visuo-spatial coordinates acquired postnatally, suggesting top-down mechanism.
We can perceive a surface through another surface. This perception is called transparency. In this study, we measured the ranges of chromaticity and luminance of the overlapping area of two crossed layers at which a surface was perceived as transparent. As the results, the chromatic range located on the additive color-mixture line between two chromaticities of inducing areas. We also investigated chromaticity constraint for transparency on multiple color background. Although a color of the transparent layer was not seen, we could have a strong impression of transparency. This result also suggested that additive color mixture is an important rule for transparency.
We studied characteristics of categorical color perception in the peripheral visual field under low illuminance. The stimuli, simulated OSA color chips by the projector, were presented at the fovea, and at the eccentricities of 30,50,70,80deg in the temporal visual field and 30,50deg in the nasal visual field under illuminances of 2000,5 and 0.1lx. The observer responsed color appearance of the stimulus with one of the 11 basic color terms. The results under 2000 and 5lx showed almost no difference among stimulus locations from the nasal 30 deg to the temporal 70 deg.