Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1987-07-22
1988-07-26
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358106, 358107, 358903, 364552, H04N 718
Patent
active
047604441
ABSTRACT:
A visual inspection device is disclosed in which a workpiece to be inspected is set onto a holding fixture in a defined position, the holding fixture having a fixed, crosshair target in a defined location on the fixture. The fixture is transported into one or more consecutive illuminated video scanned inspection fields having prepositioned therein a calibrated gray scale. The piece is then viewed for inspection by a video camera as an addressed data stream containing reflectance values and transmitted to a digitizer and a central processing unit. The inspection field of the data stream is shifted algorithmically such that the target is brought into alignment with and matches a target contained in a reference stream in memory. The data stream is further corrected algorithmically for ambient light by comparing the gray scale reflectance values in the inspection field to a reference gray scale in memory which has not been affected by ambient light. Variations in values cause rejection. Totalizing of rejection by address combinations is retained in memory and the inspection device is automatically shut down when defined rejection totals are reached.
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Kaufman Wolfgang
Nielson Paul C.
Britton Howard W.
CSD International, Inc.
Quittner Leonard M.
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