Patent ID: 6819335
Filing Date: 2004-11-16
Classification: G09G

Abstract:
A gray scale reducing method comprising a step of:converting a bit stream A (a&agr;âˆ’1, a&agr;âˆ’2, a&agr;âˆ’3, . . . a0) of 2&agr; gray levels expressed by input of the bit stream A=a&agr;âˆ’1Ã—2&agr;âˆ’1+a&agr;âˆ’2Ã—2&agr;âˆ’2+a&agr;âˆ’3Ã—2&agr;âˆ’3+ . . . +a0Ã—20 into a bit stream of (2&agr;âˆ’2&agr;âˆ’&bgr;+1) gray levels expressed by output bit stream Y=a&agr;âˆ’1Ã—2&agr;âˆ’1+a&agr;âˆ’2Ã—2&agr;âˆ’2+a&agr;âˆ’3Ã—2&agr;âˆ’3+ . . . +a0Ã—20âˆ’(a&agr;âˆ’1Ã—2&agr;âˆ’&bgr;âˆ’1+a&agr;âˆ’2Ã—2&agr;âˆ’âˆ’2+ . . . +a&bgr;Ã—20) wherein &agr; is a number of bits in the bit stream A and &agr; is &gE;2, and wherein &bgr; is a number of bits by which the bit stream A is right-shifted and &agr;>&bgr;&gE;1.