Foreground subject-identifying apparatus

Details Foreground subject-identifying apparatus Foreground subject-identifying apparatus

1981-02-25

1984-07-03

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

343 65SS, G01S 956

Patent

active

044582358

ABSTRACT:
A foreground subject-identifying apparatus includes a signal transmitter for sending forth microwave question signals; a code signal generator for emitting a code signal in response to a question signal delivered from the signal transmitter; and signal-receiving device for interpreting code signal received from the code signal generator. The signal transmitter intermittently generates a microwave check signal in a first operation mode, and sends forth a microwave question signal in a second operation mode. The code signal generator sends forth an output signal in response to a check signal delivered from the signal transmitter, and then the signal receiver causes the signal transmitter to be set at the second operation mode to generate a question signal.

REFERENCES:
patent: 3363247 (1968-01-01), Chausse et al.
patent: 3772668 (1973-11-01), Smith
patent: 3859624 (1975-01-01), Kriofsky et al.
patent: 4069472 (1978-01-01), Kamata et al.
patent: 4209783 (1980-06-01), Ohyama et al.
patent: 4263595 (1981-04-01), Vogel
patent: 4339753 (1982-07-01), Mawhinney

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