Patent Document ID: 9846925
Application ID: 15063646
Patent Status: 1

Claim One:
1. A defog system comprising: an illuminance sensor configured to detect ambient illuminance; and at least one processor to implement: a level determiner configured to determine a defog level of an input image based on the ambient illuminance; and a defogger configured to determine whether to defog the input image based on skewness and kurtosis of a histogram of the input image, and, in response to the defogger determining to defog the input image, determine a fog condition of the input image based on a cumulative probability of the histogram, and defog the input image based on the defog level, wherein the defogger comprises: a histogram generator configured to generate the histogram of the input image: an analyzer configured to determine the skewness and the kurtosis of the histogram; a fog detector configured to, in response to the skewness and the kurtosis being within a range, detect a first minimum luminance, in which the cumulative probability of the histogram corresponds to a minimum reference probability, and a first maximum luminance, in which the cumulative probability of the histogram corresponds to a maximum reference probability and a scaler configured to scale the input image by resetting the first minimum luminance and the first maximum luminance respectively to a second minimum luminance and a second maximum luminance based on the defog level, and wherein the fog detector is further configured to, in response to at least one among the skewness and the kurtosis being outside the range, reduce the minimum reference probability, and detect the first minimum luminance, in which the cumulative probability of the histogram corresponds to the reduced minimum reference probability.