Alignment and recognition apparatus

Details Alignment and recognition apparatus Alignment and recognition apparatus

1980-06-30

1982-12-14

Masinick, Michael A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 718

Patent

active

043640869

ABSTRACT:
A matrix array of objects, for example semiconductor bars, is located on a carrier such as an X-Y table and the objects are successively brought into the field of view of a television camera for precise alignment with respect to a reference point. Video signals corresponding to an image of the object and its peripheral area are digitized to produce digitized video signals predominantly of a first level corresponding to surface areas of the object and of a second level corresponding to the peripheral areas. The digitized video signals are analyzed during a plurality of data window sets which are associated with axial directions corresponding to directions of movement of the X-Y table and which correspond to areas of the video image which are in a defined position relative to different edges of the video image of the object when the latter is in an aligned position. The data windows of each set correspond to parallel video image regions having predetermined distances from each other in the associated axial direction of displacement of the carrier. If the object is mis-aligned, digitized video signals of the first level will be present in one or more data windows of at least one data window set. Operating signals are derived for each data window set characterizing the number of data windows present in that set in uninterrupted sequence from the inside to the outside of the video image of the object during which appearance of digitized video signals of the first level has occurred. These output signals provide a measure of magnitude and direction of displacement of the object and may be used in adjusting the position of the carrier to bring the object into alignment with respect to the reference position. Following this alignment step, an analysis may be made, again on the basis of digitized video signals, to confirm the presence of an object, and that the object is complete, in the aligned position. In the event a complete object is determined to be present in the aligned position, further analysis may be made on the basis of digitized video signals to determine whether the object has a surface identification mark indicating that the object is a reject.

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