Patent ID: 6822677
Filing Date: 2004-11-23
Classification: H04N

Abstract:
A method for adjusting a white balance of an image represented by a first, second, and third signals which are respectively produced by a first, second, third sensors, comprising the steps of:(a) obtaining said first, second, and third signals and a fourth signal, where the fourth signal is produced by a fourth sensor, the first, second, and third sensors are respectively sensitive to light in a blue, green, and red wavelength ranges, the fourth sensor is sensitive to light in a certain wavelength range located between a first and second wavelengths, a spectral sensitivity distribution of the first sensor has a peak at the first wavelength, and a spectral sensitivity distribution of the second sensor has a peak at the second wavelength; (b) modulating said first signal according to an absolute value of a difference between said first and fourth signals, and outputting a modulated signal; and (c) obtaining a white balance based on color image data comprised of said modulated signal and said second and third signals.