Patent ID: 6574363
Filing Date: 2003-06-03
Classification: H04N

Abstract:
A method of processing a video signal to determine when a pixel belongs to a region of interest of a color space, the method comprising the steps of, for each pixel:a) transforming the video signal into color difference signals corresponding to a set of defining axes of the color space; b) minimizing signal gain for all color difference signals except for a color difference signal defining the region of interest; c) establishing a threshold value representing the minimum magnitude that the color difference signal defining the region of interest must have when the pixel belongs to the region of interest of the color space; and, d) comparing the color difference signal defining the region of interest with the threshold value to determine if the pixel is in the region of interest of the color space, wherein said region of interest is green, said defining axes are a V axis and a U axis, wherein the V axis is defined as the red axis and the U axis is defined as the blue axis, and the color difference signal defining the region of interest is a negative V axis signal, and wherein the step of minimizing signal gain comprises minimizing the U axis signal and positive V axis signal.