Patent ID: 7812862

Claim:
A white balance adjustment method for a digital image capturing device, the method comprising: setting a color temperature estimation area, which comprises: dividing a Cb-Cr coordinate graph according to different color temperatures that define a number of color temperature curves to obtain at least one color temperature zone and at least one white zone through linear regression analysis; wherein the linear regression analysis is performed upon each color temperature curve to obtain regression lines for the different color temperatures; the area between two adjacent regression lines is evenly divided into three portions; the portion closest to each color temperature is defined as the at least one color temperature zone, and the non-selected portion is defined as the at least one white zone; and performing a white balance procedure, which comprises: capturing an image; choosing at least one analysis block from the image; obtaining a brightness value, a Cb value, and a Cr value of the at least one analysis block; determining whether the Cb value and the Cr value of the at least one analysis block are located at either the at least one color temperature zone or the at least one white zone of the color temperature estimation area; collecting each point value of each color temperature in the color temperature estimation area; calculating with each point value of each color temperature to obtain a final color temperature; and performing a white balance adjustment procedure to the image according to the final color temperature.