Approximating gradients with offset midpoints

Details Approximating gradients with offset midpoints Approximating gradients with offset midpoints

2005-07-05

2005-07-05

Jankus, Almis R. (Department: 2671)

Computer graphics processing and selective visual display system

Computer graphics processing

Three-dimension

C345S419000

Reexamination Certificate

active

06914602

ABSTRACT:
A method and computer program for approximating a gradient, the gradient defining a nonlinear transition from one color or gray level to another in an image where the rate of transition is determined by the function y=xewhere e>1. The method includes identifying an error tolerance, selecting an optimal number of set points on a curve defined by the function including determining each set point by evaluating a maximum error between a line defined by a pair of set points and a corresponding portion of the curve using the error tolerance and approximating the curve by a series of linear portions connecting the set points.

REFERENCES:
patent: 6369816 (2002-04-01), Knittel et al.

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