Patent ID: 8497872

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 color images on the display, the colorimeter configured to measure luminance and coordinates of the corresponding color images via the video detector; the white balance correction method comprising: setting target color coordinates of a target white point at a predetermined color temperature and a group of gray levels as the input gray levels in response to a first user input command on the computer; constructing R, G, B images on the display according to the group of gray levels; measuring luminance and color coordinates of the R, G, B images by the colorimeter based on the corresponding R, G, B images; selecting one color of R, G, B images to be a base color and the other two colors to be adjustable colors in response to a second user input command on the computer; fixing the gray level of the base color in response to a third user input command on the computer; estimating target luminance of the two adjustable colors by the computer based on the measured luminance of the base color; estimating the adjusted gray levels of the two adjustable colors by the computer based on estimated luminance of the adjustable colors and the Gamma table; and reconstructing the Gamma table of the display by the computer based on the estimated adjusted gray levels of the two adjustable colors.