Method and apparatus for automatically inspecting and correcting

Details Method and apparatus for automatically inspecting and correcting Method and apparatus for automatically inspecting and correcting

1977-01-25

1979-04-03

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

250563, 250572, 358106, 358107, 364515, H06N 718

Patent

active

041480651

ABSTRACT:
A pair of chromium masks of similar pattern are optically read out to generate video signals corresponding to the patterns thereon. Comparison of the pair of masks is carried out in binary signals converted from the video signals using different recognition thresholds, thereby discriminating defects in the masks. Defect information is recorded in a recording medium and used for identifying and positioning the defects in the correction process.

REFERENCES:
patent: 3049588 (1962-08-01), Barnett
patent: 3546377 (1970-12-01), Troll
patent: 3795452 (1974-03-01), Bourdelais
patent: 3887762 (1975-06-01), Uno
patent: 3916439 (1975-10-01), Lloyd
patent: 3978324 (1976-08-01), Rayner
patent: 4056716 (1977-11-01), Baxter

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