Apparatus for improving the signal-to-noise ratio of image signa

Details Apparatus for improving the signal-to-noise ratio of image signa Apparatus for improving the signal-to-noise ratio of image signa

1988-09-07

1990-03-27

Berman, Jack I.

Radiant energy

Inspection of solids or liquids by charged particles

Electron probe type

250306, 250311, 356376, H01J 3728

Patent

active

049123289

ABSTRACT:
An apparatus for improving the signal-to-noise ratio of a scan-type imaging system, in which an image portion which appears virtually periodically or regularly on contiguous scanning lines and a scanning line for which the improvement of signal-to-noise ratio is intended are specified using cursors, the positional differences on the image signal waveforms between the specified scanning line and scanning lines in the specified image portion are detected, and the image signal waveforms in the specified image portion are added by being shifted by the amount of detected positional differences, so that the signal-to-noise ratio of the image signal waveform of the specified scanning line is improved.

REFERENCES:
patent: 4039829 (1977-08-01), Kato et al.
patent: 4567364 (1986-01-01), Kano et al.

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