发明名称 |
Finding fiducials on printed circuit boards to sub pixel accuracy |
摘要 |
A method is disclosed for determining the presence and position of fiducials on the surface of a printed circuit substrate in grey level images to sub-pixel accuracy. A summation profile technique is utilized to decrease the amount of computation required and thereby increase throughput for enabling real time operation in a total component placement system.
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申请公布号 |
US5086478(A) |
申请公布日期 |
1992.02.04 |
申请号 |
US19900634642 |
申请日期 |
1990.12.27 |
申请人 |
INTERNATIONAL BUSINESS MACHINES CORPORATION |
发明人 |
KELLY-MAHAFFEY, WILLIAM L.;STAFFORD, JAMES M. |
分类号 |
G01B11/00;G06K9/46;G06T1/00;H01L21/68;H05K1/02;H05K3/30;H05K13/04 |
主分类号 |
G01B11/00 |
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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