Patent ID: 6542185
Filing Date: 2003-04-01
Classification: H04N

Abstract:
A method for calibrating a video capture device comprising:capturing an image of an optical target that includes a dark monochromatic patch having a YUV color value with a Y value less than a median Y value and a light monochromatic patch having a YUV color value with a Y value greater than the median Y value, each monochromatic patch having U and V values that are neutral; taking a predetermined number of YUV values from each monochromatic patch; calculating an average YUV value for each monochromatic patch; performing white balance using the averaged YUV values and a predetermined reference image; converting each averaged YUV value to an equivalent RGB value; taking a difference in RGB values between the light monochromatic patch and the dark monochromatic patch to produce a dynamic range for the RGB values; and adjusting the dynamic range for the G value to match the dynamic range for a Gâ€² value of the predetermined reference image.