Method and system for predicting ambient illuminance

Abstract

A method for predicting ambient illuminance includes: obtaining image data of a tested environment by utilizing an image sensor; performing an automatic exposure operation on the image data to obtain an exposure time and a gain used by the image sensor when obtaining the image data; multiplying the exposure time by the gain and then getting the reciprocal of the multiplied value to obtain a computed value; identifying a scene category corresponding the tested environment and identifying a human shape and skin color category corresponding the tested environment based on the image data; configuring a leading coefficient and an exponential coefficient according to the scene category and the human shape and skin color category; substituting the computed value, the leading coefficient, and the exponential coefficient into an equation: A*X Bto obtain a predicted illumination value of the tested environment, where X is the computed value, A is the leading coefficient, and B is the exponential coefficient.

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