Automatic defect-detecting method and apparatus

Details Automatic defect-detecting method and apparatus Automatic defect-detecting method and apparatus

1975-09-30

1976-10-26

Griffin, Robert L.

Telegraphy

Systems

Simplex-reversing periodic

178 68, 178DIG36, 178DIG37, 250562, 356199, H04N 719

Patent

active

039885305

ABSTRACT:
An automatic surface defect-detecting method and apparatus for detecting only effective significant surface defects. The significant defects can be detected from video signals and differential signals corresponding to particular scanning lines respectively by removing the distributed density portions having a larger pulse width in the scanning line direction, or removing smaller differential value portions in density, from the examined portions with higher density of flourescent magnetic powders thereon.

REFERENCES:
patent: 2798605 (1957-07-01), Richards
patent: 2803755 (1957-08-01), Milford
patent: 3019347 (1962-01-01), Laycak
patent: 3020034 (1962-02-01), Laycak
patent: 3379829 (1968-09-01), Gambrell
patent: 3889053 (1975-06-01), Lloyd et al.

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