Boots – shoes – and leggings
Patent
1986-09-19
1989-02-21
Lall, Parshotam S.
Boots, shoes, and leggings
178 18, 340710, 250221, 356221, 341 31, G08C 2100, G01C 2500, G09G 302
Patent
active
048071668
ABSTRACT:
A method and apparatus for calibrating an electro-optical mouse during the detection of light reflected from a surface with optically contrasting indicia. The voltage output from the light detector is compared with stepped ramped sequences of reference voltage signals representing a count, the ramped sequence being stopped in response to each transition of the comparator between a first state where the amplitude of one of the input signals is less than that of the other and a second state where the amplitude of the one of the input signals is equal to or greater than the other. A processor determines the highest and lowest numbers at which any of the ramped sequences are stopped; and calculates at least one threshold value in dependence on the difference between the highest and lowest numbers.
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Dixon Joseph L.
Lall Parshotam S.
Summagraphics Corporation
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