Patent ID: 6781636
Filing Date: 2004-08-24
Classification: G06T

Abstract:
A video apparatus having histogram modification means for matching at least luminance signals for separate pixels to prescribed values, the histogram modification means comprising:a first channel having a first memory containing a first look-up table for correcting said luminance signals; and at least one second channel having a second memory containing a second look-up table for correcting color-difference signals corresponding to said luminance signals, wherein values stored in said second look-up table are derived from the values stored in the first look-up table, characterized in that the first look-up table contains corrected luminance values in accordance with a predetermined correction function, and the second look-up table contains gain-values, derivable from said predetermined correction function, and the histogram modification means further comprises a multiplier for multiplying the color-difference signals by respective gain-values as supplied by the second look-up table.