Importance

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Abstract

A photographic camera includes a photosensitive image receiver for generating an image, an optical system for focusing incident light representative of the image upon the receiver, and an exposure control section for generating an exposure value from the incident light that is used to regulate image capture. The exposure control section includes an exposure table containing control values that regulate the acquisition parameters that control the image. The table includes a sequence of table entries for exposure values and corresponding values of at least one of an optical aperture value and an electronic gain value that provide for each table entry a correct exposure for the corresponding exposure value. The sequence of table entries are selected to include the switch points for aperture and gain such that increments between exposure values are variable in length, while a continuous series of optical aperture values and gain values are represented in the table. By thus using variable-length exposure value increments, the tables can be tailored to provide optimum image quality while minimizing the size of memory needed to store the tables.

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First Claim