发明名称 |
Method and apparatus for calibrating an electro-optical mouse |
摘要 |
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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申请公布号 |
US4807166(A) |
申请公布日期 |
1989.02.21 |
申请号 |
US19860909829 |
申请日期 |
1986.09.19 |
申请人 |
SUMMAGRAPHICS CORPORATION |
发明人 |
ZALENSKI, THOMAS |
分类号 |
G06F3/03;G06F3/033;G06F3/038;G06F3/039;(IPC1-7):G08C21/00;G01C25/00;G09G3/02 |
主分类号 |
G06F3/03 |
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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