Video image compensator for inspection apparatus

Details Video image compensator for inspection apparatus Video image compensator for inspection apparatus

G - Physics

01

M

350/32

G01M 11/00 (2006.01) G01N 21/84 (2006.01) H04N 7/02 (1980.01)

Patent

CA 1183939

ABSTRACT OF THE DISCLOSURE A video image compensator for inspection apparatus is presented for utilization in a system of the type in which an image of a workpiece is digi- tized and compared against stored data representing a workpiece of known acceptable quality. The inven- tion compensates for instability, drift, and distor- tion inherently present in vidicons by providing a test pattern for periodic viewing by the vidicon, and providing therefrom data from which scale factors and image shift data can be generated. Subsequent live images of workpieces can then be scaled and shifted prior to correlation with the stored refer- ence to compensate for instability, drift, and dis- tortion of the vidicon. A mirror is used to alter- nately direct the field of view of the vidicon to either the test pattern or the workpiece target. In one embodiment, the mirror is made selectively transparent to allow the workpiece to be viewed, while in an alternate embodiment, the mirror is phy- sically deflected from the vidicon's field of view.

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