照度計算のアナロジーを用いた商業施設内看板の視覚的情報取得に関する研究（その２）：誘目性の検討

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  • RESEARCH ON VISUAL INFORMATION ACQUISITION OF SIGNBOARD IN SHOPPING MALL USING ANALOGY WITH ILLUMINANCE CALCULATION (PART 2): FOCUSING ON NOTICEABILITY
  • ショウド ケイサン ノ アナロジー オ モチイタ ショウギョウ シセツ ナイ カンバン ノ シカクテキ ジョウホウ シュトク ニ カンスル ケンキュウ(ソノ 2)ユウメショウ ノ ケントウ

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<p> Many research has been done on noticeability of signboards in the field of visual environment and advertisement. Most of them results in image analysis of a vision from a particular point, and does not incorporate the influence of migratory within the building. This study focused on the predictability of signboard noticeability by using analogy with illuminance calculation. Similar to the previous research, hypothesis was set that visual information acquisition can be calculated using illuminance calculation. Unlike the previous research, analogy was set as following; view point as light source and signboard as light receiving surface. Light source that modeled eyesight attribution was incorporated under 3D lighting simulation of the experimental condition. To test the hypothesis and to derive the threshold value to notice, two experiments were conducted to verify the hypothesis.</p><p> Experiment 1 was conducted at a shopping mall. 18 subjects were asked to find “R” or “r” along the straight walking course. Noticed point and signboard was recorded. There were 17 possible “R” and “r” that could be found. As a result, 187 notice occurred. To consider the relationship between the hypothesis, 3D model was created, and setting the signboard as light receiving surface, noticeability frequency Eβ was calculated. Noticeability frequency at each point vs. number of noticed subjects were plotted, and clear relationship was seen.</p><p> Based on previous study on visibility and legibility, area, luminance contrast, font factor and number of letters were used to derive the induced sight amount E. To derive the threshold value to notice, logistic analysis was conducted. Logistic analysis was chosen, since it can consider the difference of number of noticed subjects. 50% response rate, which corresponds to 9 persons, was calculated, and average of the signboards per person was calculated as 0.086. To understand the significance of the value, induced sight amount E of Landolt ring was calculated. As a result, the threshold value was near to condition of visual acuity of 0.7.</p><p> Experiment 2 was conducted to verify the threshold value. Similar experiment was done, and subjects were asked to find “C” or “c” at a different route. To use the data as verification, 3D simulation was done to calculate noticeability frequency and induced sight amount. Points exceeding the threshold value were derived, and relationship with the numbers of noticed people was seen. However, in case of exceeding drastically, in case of signboard at higher floor and in case of existing competitive signboard, the prediction error increased. Further analysis has to be done to increase the predictability.</p>

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