Patent ID: 7474847

Claim:
A method for adjusting exposure in digital imaging, the method comprising: capturing a raw image frame corresponding to given exposure parameters by a camera sensor; forming a histogram from the raw image frame; specifying a plurality of characteristic values from the histogram, including at least a first characteristic value being at least partly based on a mean value of the histogram and a second characteristic value indicating substantially the bright end of the histogram; setting at least a minimum target level for the first characteristic value and a dynamic target interval for the second characteristic value; comparing the first characteristic value to its minimum target level and the second characteristic value to its dynamic target interval; in response to either the first characteristic value not exceeding its minimum target level or the second characteristic value not locating within its dynamic target interval, calculating a total offset required to guide the first characteristic value to exceed its minimum target level and the second characteristic value to locate within its dynamic target interval; and adjusting the exposure parameters on the basis of the first and second characteristic value biased by the total offset.