06937775 is referenced by 25 patents and cites 18 patents.

A method of processing a digital image to improve contrast, the digital image being derived from an image captured by a recording medium having a nonlinear response to light, includes the steps of: applying a spatial filter to the digital image to produce a noise reduced digital image; subtracting the noise reduced digital image from the digital image to produce a difference digital image; applying a tone scale function to the noise reduced digital image to produce a tone scale adjusted digital image having the appearance of being derived from an image captured by a recording medium having a linear response; and combining the difference digital image with the tone scale adjusted digital image to produce a processed digital image, whereby the contrast of the digital image is improved without amplifying noise.

Title
Method of enhancing the tone scale of a digital image to extend the linear response range without amplifying noise
Application Number
10/145937
Publication Number
6937775 (B2)
Application Date
May 15, 2002
Publication Date
August 30, 2005
Inventor
Andrew C Gallagher
Brockport
NY, US
Edward B Gindele
Rochester
NY, US
Agent
Thomas H Close
Assignee
Eastman Kodak Company
NY, US
IPC
G06K 009/40
View Original Source