講演情報
[PO2-07]Exploring Perceptual Fidelity in the Reproduction of Star Fields
*Midori Tanaka1, Takahiko Horiuchi1, Kenichi Otani2 (1. Chiba University (Japan), 2. Konica Minolta Planetarium Co., Ltd. (Japan))
キーワード：
Faithful reproduction、Perceptual imaging、Subjective evaluation
Which factors influence the design of star images to accurately reproduce the appearance of the night sky in planetariums? This paper explores perceptually faithful star images through psychophysical evaluation experiments using optical projection stimuli with varying color, brightness, and size parameters.
The observation targets included stars of different brightness levels and color temperatures, utilizing the Orion region familiar to Japanese astronomy education. The brightness within the dark dome was less than magnitude 23 when using the Sky Quality Meter. Most stars brighter than magnitude 7.4 reproduced by projection were recognizable, as the limiting magnitude for observation in darkness of magnitude 23.0 was approximately magnitude 7.0. A group of experts with extensive astronomical observation experience designed the standard projection pattern to be perceptually, rather than physically, faithful to the actual night sky. In addition to the standard pattern, a reproduction system was constructed to project ten different star image patterns onto the planetarium dome. Each pattern has different parameters: three color temperature shift patterns, three luminance shift patterns, two size change patterns, and one Planckian locus pattern, which approximates the color temperature of actual stars.
Twenty evaluators with varying experience in astronomical observation and age participated in the experiment. The results showed that perceived fidelity is significantly affected by star brightness. Any change in brightness leads to a decrease in perceived fidelity, whether the stars are brighter or darker than the standard pattern. Furthermore, fidelity improved when the projected stars were smaller. However, fidelity significantly declined when the stars were larger than the standard pattern. Regarding color differences, the results suggested a wider tolerance for reduction in fidelity.
The observation targets included stars of different brightness levels and color temperatures, utilizing the Orion region familiar to Japanese astronomy education. The brightness within the dark dome was less than magnitude 23 when using the Sky Quality Meter. Most stars brighter than magnitude 7.4 reproduced by projection were recognizable, as the limiting magnitude for observation in darkness of magnitude 23.0 was approximately magnitude 7.0. A group of experts with extensive astronomical observation experience designed the standard projection pattern to be perceptually, rather than physically, faithful to the actual night sky. In addition to the standard pattern, a reproduction system was constructed to project ten different star image patterns onto the planetarium dome. Each pattern has different parameters: three color temperature shift patterns, three luminance shift patterns, two size change patterns, and one Planckian locus pattern, which approximates the color temperature of actual stars.
Twenty evaluators with varying experience in astronomical observation and age participated in the experiment. The results showed that perceived fidelity is significantly affected by star brightness. Any change in brightness leads to a decrease in perceived fidelity, whether the stars are brighter or darker than the standard pattern. Furthermore, fidelity improved when the projected stars were smaller. However, fidelity significantly declined when the stars were larger than the standard pattern. Regarding color differences, the results suggested a wider tolerance for reduction in fidelity.