Light source discriminating device for a camera

Details Light source discriminating device for a camera Light source discriminating device for a camera

1990-11-21

1992-07-07

Adams, Russell E.

354105, G03B 708

Patent

active

051287080

ABSTRACT:
A light source discriminating device for use with an image taking apparatus, e.g. a photographic camera, judges whether a bright line having a particular wavelength exists in the light source illuminating a scene to be taken, in order to judge whether the light source is to be a fluorescent lamp. When the light source is judged not to be a fluorescent lamp, then it is determined whether the light source is a tungsten lamp. According to a preferred embodiment, a band-pass filter is used to transmit only a component of a particular frequency range in an output of a photosensor. When the transmitting ratio of the component of the photosensor output is not less than a predetermined value, then the light source is judged to be a tungsten lamp. In flash photography, an object brightness is measured in order to judge that daylight synchronized flash photography is effected if the measured object brightness is not less than a predetermined value. In the preferred embodiment, it is judged, from the time the scene is taken, whether the scene is taken in early evening, in order to prevent an image from being reproduced in a changed color, because the color temperature of the daylight is low. Similarly, it is judged from the day of taking the scene in the year whether the scene is taken in the winter, for the same reason. The resulting judgment data are recorded on a recording medium, e.g. photographic film, in bar code form.

REFERENCES:
patent: 3850530 (1974-11-01), Uno et al.
patent: 4041308 (1977-08-01), Fujita
patent: 4079388 (1978-03-01), Takahama et al.
patent: 4220412 (1980-09-01), Shroyer et al.
patent: 4335943 (1982-06-01), Numata

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