いき上レベルにおける視覚の空間的寄せ集め特性が灯火の明るさ知覚に及ぼす影響

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タイトル別名
  • Effect of Spatial Summation on Brightness Perception of a Light at Suprathreshold Level
  • イキジョウ レベル ニ オケル シカク ノ クウカンテキ ヨセアツメ トクセイ

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説明

The properties of spatial summation by the eyes at suprathreshold levels are not clearly understood. An experiment on the brightness of a test stimulus as a function of its area and background luminance was carried out to clarify the properties. The luminous intensity of the test stimulus to match a point stimulus in brightness was measured.<BR>The results are as follows:<BR>(1) The spatial summation is complete regardless of the background luminance for an area of less than 10min2. It becomes gradually less complete as the area is more than 10min2. As background luminance increases, the effect of the spatial summation decreases, and little summation occurs for an area of more than 103 min2 at background luminance of 1cd/m2 and 10cd/m2.<BR>(2) The range of partial summation at suprathreshold levels is wider than that at threshold levels.<BR>(3) Log (It/Im) increases linearly with log (Lb).<BR>(4) It is necessary to treat a light as a surface source to obtain the brightness, in the case that we observe a traffic signal light from a short distance.

収録刊行物

  • 照明学会誌

    照明学会誌 77 (2), 90-94, 1993

    一般社団法人 照明学会

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