Patent ID: 8294827

Claim:
A white balance correction method for implementation by a white balance correction system, the white balance system comprising a computer, a video signal generator, a colorimeter, a video detector, and a display all under control of the computer, the display comprising a Gamma table for storing corrective action associated with relationships between input gray levels and output gray levels of the display, the video signal generator configured to generate RGB signals having pre-determined gray levels to form white color images on the display, the colorimeter configured to measure luminance and coordinates of the corresponding white color images via the video detector; the white balance correction method comprising: setting a target color coordinates of a target white point of a target white point plane at a predetermined color temperature and a group of gray levels as the input gray levels in response to a user input command; constructing a white color image according to the group of the gray levels; measuring luminance and color coordinates of a measured white point of the white color image; calculating an error between the target color coordinates and the measured color coordinates; determined whether the error satisfies an error requirement; if the error does not satisfy the error requirement, estimating luminance of the R, G, B based on the standard color coordinates defined in a standard color space, the measured luminance and color coordinates of the measured white point; estimating gray levels of the R, G, B based on the estimated luminance of the R, G, B; and reconstructing the Gamma table based on the estimated adjusted gray levels of the two adjustable colors.