Photography – With exposure objective focusing means – focusing aid – or... – With electronic filtering
Patent
1994-08-25
1997-09-09
Adams, Russell E.
Photography
With exposure objective focusing means, focusing aid, or...
With electronic filtering
G03B 1336
Patent
active
056665695
ABSTRACT:
A fixed lens camera comprises a fixed focus lens, an infrared filter, and an optical low pass filter, all disposed in succession within a housing, coaxial with an optical axis. Light from a target passes through an aperture in the housing, and then through the lenses and filters. An image sensor receives the filtered light, and outputs a two-dimensional array signal of corresponding voltages proportional to the incident light striking each sensing element. The voltage signal from the image sensor is filtered using a high pass filter, and the high frequency components of the signal are measured to determine the relative focus of the light from the target. The signal measurement is displayed on a bar LCD to enable focusing of the lens by moving the camera along the optical axis while observing the LCD output.
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Anderson Eric C.
Fullam Scott F.
Adams Russell E.
Flashpoint Technology, Inc.
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