Patent ID: 7095906
Filing Date: 2006-08-22
Classification: G06T

Abstract:
1. An apparatus for performing alpha blending calculations on a first digital image value and a second digital image value according to a digital alpha (α) value having a fractional part of n digits and having a most significant bit of α i and a least significant bit of α n−1 and wherein the order of α i is related to an i th digit of α, comprising: a plurality of multiplexers, each of the plurality of multiplexers configured to receive a bit value, α a plurality of shifters, each shifter having a set of inputs connected to the outputs of one of the multiplexers to receive the selected digital image value, each shifter left-shifting the selected digital image value according to the multiplexer to which the shifter is connected; and an adder configured to receive the plurality of left-shifted outputs from the shifter and further configured to produce the sum of the left-shifted outputs from all of the shifters.