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Gradation Logic in the Shape of Rectangle Correcting an Optical Illusion

IP.com Disclosure Number: IPCOM000123697D
Original Publication Date: 1999-Mar-01
Included in the Prior Art Database: 2005-Apr-05
Document File: 1 page(s) / 89K

IBM

Related People

Tosaka, E: AUTHOR

Abstract

Disclosed is Gradation logic in the shape of rectangle correcting an optical illusion.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

Gradation Logic in the Shape of Rectangle Correcting an Optical Illusion

Disclosed is Gradation logic in the shape of rectangle
correcting an optical illusion.

With a simple gradation logic i.e. the brightness and
shade are changed in proportion to the distance between the center of
the rectangle and the point on the rectangle edge (Formula 1), an
illusion of a cross is created on the rectangle.
P = D --- (Formula 1)

This logic corrects this optical illusion.  The following
formula shows how to calculate the transition P of a color or
brightness on a regularized distance which is parallel to the
rectangle edge.
P = sqrt (D*D + N*N*(1-D)) --- (Formula 2)

The result of formula 1 and 2 are shown in Fig. 1 and 2
respectively.