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- W2002065103 abstract "This paper gives preliminary results of a continuing experimental study of factors affecting the precision of centering black circular measuring marks in sharp, high-contrast targets with homogeneous backgrounds, subtending visual angles up to 45 min of arc, in photopic vision. The results support the proposition that adjacency effects at edges contain significant visual information, and this would appear to be important where visual settings are being made by bringing geometrical configurations into close relationship with one another. The maximum information content for the centering task investigated was contained in ribbons approximately 1 min of arc wide around the light areas of target and measuring mark. The most precise pointings were made by selecting a measuring mark to give a minimum annulus width within these ribbons irrespective of the target size. The results support the concept of a retinal zone approximately 4 min of arc in diameter over which the acuity is constant or perhaps in transition, but further suggest that this may be dependent on the type of task involved. The acuity in the horizontal retinal meridian was some 30% greater than that in the vertical meridian for annulus up to 4 min of arc. The threshold pointing errors of less than 1 sec of arc visual subtense motivated a search for a simple yet more accurate instrument for coordinate measurement. A prototype polar-coordinate monocomparator using a laser interferometer is briefly described in addition to new apparatus for continuing these investigations." @default.
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- W2002065103 date "1967-03-01" @default.
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- W2002065103 title "Some factors affecting the precision of coordinate measurements on photographic plates" @default.
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- W2002065103 doi "https://doi.org/10.1016/0031-8663(67)90028-2" @default.
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