Apparatus for compensating digital video signal
AssigneeLG Electronics Inc.
InventorsIn Ho Lee, Dong Il Han
Life of this patent
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Abstract
An apparatus for displaying a digital video signal includes a shade reflection ratio calculator and a brightness compensator. The shade reflection ratio calculator calculates a shade reflection ratio r of each pixel per display clock using a linear distance function between a center pixel and a current pixel on a screen. The brightness compensator compensates brightness of each pixel by applying the shade reflection ratio value r and a brightness adjustment width Yrate to an input digital video signal. Thus, it is possible to improve picture quality of a video displayed on a screen.
Claims9
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=Yi−Yi×(Yrsite×(1−r″))
- 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 ‘1’.
An apparatus for compensating a digital video signal comprising:
- shade reflection ratio calculator for calculating a shade reflection ratio of each pixel per display clock using linear distance function between a center pixel and a current pixel on a screen;
- and
- 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 shade reflection ratio calculator is a hardware element that calculates the shade reflection ratio value r using an algorithm below:
- r=sqrt(Xc−x)2+(Yc−y)2/sqrt(Xc2+Yc2) (1)
- where Xc and Yc denote x and y coordinate values of the center pixel, and x and y denote x and y coordinate values of the current pixel on the screen.
Dependencies are inferred from the claim text.