Range finding device with a spatial low-pass filter

Details Range finding device with a spatial low-pass filter Range finding device with a spatial low-pass filter

1981-07-28

1987-02-03

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250201, 354404, 354407, 354408, G01J 120, G03B 310

Patent

active

046410228

ABSTRACT:
A trigonometric range finding device is provided which detects a focal point by comparing image readout signals of two rows of digital sensors. The range finding device incorporates an optical low-pass filter inserted between the lens and digital sensor rows for lowering the MTF (modulation transfer function) of the spatial frequency component of the image which is higher than the spatial frequency component corresponding to the pitch of the digital sensors arranged in rows, so that erratic operation of the range finding device may be prevented.

REFERENCES:
patent: 4027970 (1977-06-01), Misek
patent: 4047022 (1977-09-01), Holle
patent: 4352545 (1982-10-01), Uno et al.
J. W. Goodman, Introduction To Fourier Optics (McGraw-Hill: 1968) pp. 101-120.

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