Scene intensity measuring and illumination source detection appa

Details Scene intensity measuring and illumination source detection appa Scene intensity measuring and illumination source detection appa

1997-04-18

1998-08-25

Perkey, W. B.

Photography

Exposure control circuit

Color temperature compensation or detection

356222, 356404, G03B 708, G01J 142, G01J 340

Patent

active

057992169

ABSTRACT:
Scene intensity measuring and illumination source detection apparatus for determining scene illuminant and appropriate exposure settings for an image capture device is disclosed. The apparatus includes a diffractive optical element including an off-axis segment for dispersing incident scene illumination into its spectral components and for focusing the incident scene illumination, a structure responsive to the spectral intensities of the spectral components of the incident scene illumination for producing detection signals corresponding to such spectral components, a structure coupled to the sensing means for producing digitized detection signals, and a structure responsive to the digitized detection signals for determining the scene illuminant and the appropriate exposure settings for the image capture device.

REFERENCES:
patent: 5617175 (1997-04-01), Asakura et al.
patent: 5710948 (1998-01-01), Takagi

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