发明名称 |
Non-contact determination of the position of a rectilinear feature of an article. |
摘要 |
<p>A high resolution CCD video camera (6) is positioned and aligned with respect to an illuminated article (7) so that a straight edge of the article, or a straight line junction between a bright zone and a dark zone of its surface, crosses the field of view of the camera in a direction substantially parallel to the rows of the camera's orthogonal array of rows and columns of light responsive elements,to divide that field of view into bright and dark zones. A frame store and digitiser (9) converts the individual signals generated by the elements into digital grey values. The grey values derived from the elements of each row are summed by a computer (10) to produce a linear array of summation values positionally related to the respective columns, and the computer then determines the position of the edge or junction to a sub-column spacing accuracy by determining the mean value of two of the summation values selected respectively from a row receiving energy from the bright zone and one receiving energy from the dark zone and establishing a position in the array for the mean value, and thus for the feature, by interpolating the mean value between the two summation values immediately above and below it in magnitude.</p> |
申请公布号 |
EP0289084(A2) |
申请公布日期 |
1988.11.02 |
申请号 |
EP19880200772 |
申请日期 |
1988.04.21 |
申请人 |
JOHN LYSAGHT (AUSTRALIA) LIMITED |
发明人 |
MORRISON, BRUCE ROBERT;LAKE, JOHN STUART HENRY |
分类号 |
G01B11/00;B21B37/28;G01B11/02;G01B11/04;G01B11/24;G05D3/12 |
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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