Jeffrey L Bell

US Patent:

6370265, Apr 9, 2002

Filed:

Nov 24, 1999

Appl. No.:

09/449075

Inventors:

Jeffrey H. Bell - Wilmington DE
Eric L. Gingold - Bala Cynwyd PA

Assignee:

Direct Radiography Corp. - Newark DE

International Classification:

G06K 900

US Classification:

382132, 382274, 345155

Abstract:

A method for generating on demand a gray scale transfer curve for use in displaying an image comprised of a plurality of digital values representing pixel gray scale levels with a desired contrast and brightness. This is achieved by using a single sigmoid shaped function Y=f(X, a, b, c) resembling an HD curve of a photographic film. The Y axis represents digital output values to be used in displaying an image, while the X axis represents input digital values representing captured image information. âaâ is a number representing boundary conditions for X and Y, âbâ is a first parameter controlling the location of the curve along the X axis and âcâ is a second parameter controlling the slope of the curve slope. This function is used to derive a Look-Up-Table (LUT) representing a continuous GST curve having the desired contrast and brightness.

US Patent:

49006444, Feb 13, 1990

Filed:

Jun 10, 1988

Appl. No.:

7/205245

Inventors:

Jeffrey H. Bell - Wilmington DE

Assignee:

E. I. Du Pont De Nemours and Company - Wilmington DE

International Classification:

G03F 100

US Classification:

430 6

Abstract:

This invention relates to a gradient radiation intensifying screen having as an integral part thereof a tonable, photosensitive layer bearing a toned, anatomically correct, unsharp halftone image.