Patent ID: 6724438
Filing Date: 2004-04-20
Classification: G06T,G09G,H04N

Abstract:
An apparatus for compensating a digital video signal comprising:a shade reflection ratio calculator for calculating a shade reflection ratio of each pixel per display clock using a linear distance function between a center pixel and a current pixel on a screen; and a brightness compensator for compensating brightness of each pixel corresponding to an input digital video signal using the shade reflection ratio value r and an externally provided brightness adjustment range Yrate wherein the brightness compensator is a hardware element that compensates brightness of the luminance signal Y corresponding to each pixel using an algorithm below: Yo=Yiâˆ’YiÃ—(YrsiteÃ—(1âˆ’râ€³)) where, Yo is a value of compensated brightness for each pixel, Yi is an input pixel value, and Yrate is a brightness adjustment range that is ratio of the darkest portion when the range of the value that the luminance component Y can take is normalized at â€˜1â€™.