Patent ID: 6937287
Filing Date: 2005-08-30
Classification: H04N

Abstract:
1. A video processing apparatus including: a comparator for comparing a digitized input luminance signal with a predetermined threshold value; a NOT gate for inverting the input luminance signal; a first selector receiving the input luminance signal and the output of the NOT gate, and selecting one of them in accordance with the result of the comparison at the comparator; a ROM responsive to the signal output from the first selector, for generating an adjustment characteristic signal; a first multiplier for multiplying the adjustment characteristic signal from the ROM with a weighting signal supplied from the outside, to produce an adjustment value; a subtractor for determining the difference between the input luminance signal and the adjustment value; a first adder for determining the sum of the input luminance signal and the adjustment value; and a second selector responsive to the output of the subtractor and the output of the first adder and selecting one of them in accordance with the result of the comparison at the comparator; wherein at least one of black and white levels of the input luminance signal is adjusted.