Low contrast measurement apparatus

Details Low contrast measurement apparatus Low contrast measurement apparatus

1978-06-06

1979-10-02

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358169, H04N 702

Patent

active

041700252

ABSTRACT:
A low contrast measurement apparatus for electronically measuring video signal modulation under low contrast scene conditions. The measurement apparatus utilizes a low contrast periodic optical bar chart in conjunction with a filter-integrator processor to measure very low contrast ratios.
The filter-integrator processor contains a filter which is tuned to the corresponding fundamental frequency of the bar chart, thereby reducing the noise bandwidth and consequently improving the signal-to-noise ratio. The filtered signal is integrated over one whole picture frame which results in an improved signal to noise ratio. The integrated output of the filtered video signal constitutes a linearly increasing ramp with a period equal to the frame time and whose height is proportional to the amplitude of the periodic signal.

REFERENCES:
patent: 3008001 (1961-11-01), Reith
patent: 3205446 (1965-09-01), Altemus
patent: 3875328 (1975-04-01), Gibson et al.

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