发明授权
- 专利标题： Finding fiducials on printed circuit boards to sub pixel accuracy
- 专利标题（中）： 在印刷电路板上找到基准子像素精度
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申请号： US634642申请日： 1990-12-27
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公开(公告)号： US5086478A公开(公告)日： 1992-02-04
- 发明人: William L. Kelly-Mahaffey , James M. Stafford
- 申请人： William L. Kelly-Mahaffey , James M. Stafford
- 申请人地址： NY Armonk
- 专利权人： International Business Machines Corporation
- 当前专利权人： International Business Machines Corporation
- 当前专利权人地址： NY Armonk
- 主分类号： G01B11/00
- IPC分类号： G01B11/00 ; G06K9/46 ; G06T1/00 ; H01L21/68 ; H05K1/02 ; H05K3/30 ; H05K13/04
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.
公开/授权文献
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