Patent ID: 6091908
Filing Date: 2000-07-18
Classification: G03B

Abstract:
A photometric device for accurately determining an exposure value in a camera, comprising:an initial condition indicator that outputs initial photographic conditions;a photometer that divides a subject field into multiple regions, analyzes light and outputs a frequency as a result of the analysis;a memory that contains sets of weighting coefficients, each set of weighting coefficients corresponding to a respective light brightness pattern; anda controller that outputs a corrected exposure value coupled to the photometer, initial condition indicator and memory, comprising:an exposure calculator that determines an exposure value based on the frequency output of the photometer,a selector that chooses a set of weighting coefficients from the memory that corresponds to a light brightness pattern that most closely resembles the initial photographic conditions output by the initial condition indicator,a frequency analyzer that receives the frequency output from the photometer and determines an associated power spectrum, anda re-calculator that determines a corrected exposure value using the power spectrum from the frequency analyzer and the set of weighting coefficients chosen by the selector.