发明名称 |
Method and apparatus for expressing relative brightness of artificial illumination as perceived by the average observer |
摘要 |
Method and apparatus for expressing as a number the relative brightness of artificial illumination as it is perceived by the average observer. There is extracted (i.e., detected) from the illumination to be measured, a blue-appearing narrow band, a green-appearing narrow band, a yellow-appearing narrow band and a red-orange-appearing narrow band. From these extracted bands are generated six different signals: a signal expressed as (aB) where (a) is about 0.23 and (B) is the watts of energy in the blue band, a signal expressed as (bG) where (b) is about 0.97 and (G) is the watts of energy in the green band, a signal expressed as (cR) where (c) is about 0.33 and (R) is the watts of energy in the red-orange band, a signal expressed as (dY) where (d) is about 0.19 and (Y) is the watts of energy in the yellow band, a signal expressed as (eG) where (e) is about 0.25 and (G) is the watts of energy in the green band, and a signal expressed as (fR) where (f) is about 0.25 and (R) is the watts of energy in the red-orange band. These signals are combined in the following manner: aB+bG+cR-dY+(the larger of eG and fR minus the smaller of eG and fR). These combined signals are expressed as a number which is indicative of the relative brightness of artificial illumination as perceived by the average observer.
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申请公布号 |
US4334782(A) |
申请公布日期 |
1982.06.15 |
申请号 |
US19800181338 |
申请日期 |
1980.08.25 |
申请人 |
WESTINGHOUSE ELECTRIC CORP. |
发明人 |
THORNTON, JR., WILLIAM A.;CHEN, EDWARD;MORTON, EDWARD W.;RACHKO, DOROTHY |
分类号 |
G01J3/51;(IPC1-7):G01J3/50 |
主分类号 |
G01J3/51 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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