Patent ID: 6823091
Filing Date: 2004-11-23
Classification: G06T

Abstract:
A method for determining an output color value for a destination pixel located between first and second adjacent source pixels having respective color values, the method comprising:calculating a first color slope between the color value of a previous pixel and the color value of the first pixel; calculating a second color slope between the color value of a subsequent pixel and the color value of the second pixel; determining whether the first and second slopes have opposite polarities: where the polarities are opposite, approximating first and second color gradients cosited with the first and second pixels as being equal to the first and second color slopes, respectively; otherwise, approximating the first and second color gradients as being equal to twice the first and second color slopes, respectively; solving coefficients for a cubic polynomial transition model between the first and second adjacent pixels from the color values of the first and second pixels and the approximations of the first and second color gradients; and determining an output color value from the cubic model to render a resampled destination image.