Alignment apparatus

Details Alignment apparatus Alignment apparatus

1980-03-17

1981-11-17

Ng, Jin F.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

356400, 364559, H04N 700

Patent

active

043014704

ABSTRACT:
A matrix array of semiconductor bars is located on an X-Y table and the bars are successively brought into the field of view of a television camera for precise alignment with respect to a reference point. The video signals corresponding to an image of the bar and its peripheral area are digitized to produce digitized video signals predominantly of a first level corresponding to surface area of the bar and of a second level corresponding to the peripheral areas. The digitized video signals are analyzed in data window sets, there being one data window set associated with a single edge of the image of the object, for each of the X and Y directions, corresponding to separate regions of the video image having in the associated axial direction predetermined distances from each other and different distances from an associated edge of the image of the object. When the bar is properly aligned, digitized video signals of the first level are detected in a predetermined number, different from zero, of the data windows in each set during the analysis in a predetermined sense in the associated axial direction. If the bar is misaligned, a number of digitized video signals of the first level, different from the predetermined number, will be revealed by the said analysis of each data window set and this information can be used to adjust the position of the X-Y table to precisely align the bar.

REFERENCES:
patent: 3899634 (1975-08-01), Montone et al.
patent: 4203132 (1980-05-01), Schmitt et al.
patent: 4212031 (1980-07-01), Schmitt et al.

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