专利名称：Method and apparatus for performing
fixturing in a machine vision system
发明人：Adam Wagman申请号：US09747814申请日：20001222公开号：US06751361B1公开日：20040615
专利附图：
摘要：A single non-rotationally symmetric fiducial mark, such as a Universal AlignmentTarget, is placed on an object and the alignment of the object is determined with a visiontool that can align objects with translation and at least one additional degree of
freedom, such as angular orientation. Alternatively, if a unique non-rotationally
symmetric feature occurs naturally on the object, that feature may be used instead of afiducial mark. In one embodiment, a geometrical feature matching vision tool is used tolocate the single fiducial mark. In another embodiment, a normalized correlation searchtool is used to locate the mark. The tool internally generates a set of rotated and scaledpatterns that are then stored. The stored patterns are subsequently used to performthe search. In still another embodiment, a normalized correlation search tool internallygenerates a set of rotated and scaled patterns at runtime when the search for the markis being performed.
申请人：COGNEX CORPORATION
代理人：Paul Kudirka
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