Dependence of Anomaloscope Matching on Viewing Distance or Field Size

Nature ◽  
1947 ◽  
Vol 160 (4053) ◽  
pp. 23-24 ◽  
Author(s):  
R. G. HORNER ◽  
E. T. PURSLOW
Keyword(s):  
Field Size ◽  
Viewing Distance

Dependence of Anomaloscope Matching on Viewing Distance or Field Size

Nature ◽  
1947 ◽  
Vol 160 (4076) ◽  
pp. 831-832 ◽  
Author(s):  
H. HARTRIDGE
Keyword(s):  
Field Size ◽  
Viewing Distance

Dependence of Anomaloscope Matching on Viewing-Distance or Field-Size

Nature ◽  
1948 ◽  
Vol 161 (4091) ◽  
pp. 484-485 ◽  
Author(s):  
R. G. HORNER ◽  
E. T. PURSLOW
Keyword(s):  
Field Size ◽  
Viewing Distance

Monitor Viewing Distance for Younger and Older Workers

2008 ◽  
Author(s):  
Neil Charness ◽  
Katinka Dijkstra ◽  
Tiffany Jastrzembski ◽  
Sallie Weaver ◽  
Michael Champion
Keyword(s):  
Older Workers ◽  
Viewing Distance

Using watermark visibility measurements to select an optimized pair of spot colors for use in a binary watermark

2020 ◽  
Vol 2020 (15) ◽  
pp. 197-1-197-7
Author(s):  
Alastair Reed ◽  
Vlado Kitanovski ◽  
Kristyn Falkenstern ◽  
Marius Pedersen
Keyword(s):  
Food Packaging ◽  
Red Light ◽  
Human Observer ◽  
Viewing Distance ◽  
Point Of Sale ◽  
Complementary Color ◽  
Low Visibility ◽  
Packaging Industry ◽  
Spot Color ◽  
Selection Of

Spot colors are widely used in the food packaging industry. We wish to add a watermark signal within a spot color that is readable by a Point Of Sale (POS) barcode scanner which typically has red illumination. Some spot colors such as blue, black and green reflect very little red light and are difficult to modulate with a watermark at low visibility to a human observer. The visibility measurements that have been made with the Digimarc watermark enables the selection of a complementary color to the base color which can be detected by a POS barcode scanner but is imperceptible at normal viewing distance.

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