Glenn Allan Woodell

US Patent:

6834125, Dec 21, 2004

Filed:

Jun 25, 2001

Appl. No.:

09/888701

Inventors:

Glenn A. Woodell - Newport News VA
Daniel J. Jobson - Newport News VA
Zia-ur Rahman - Williamsburg VA

Assignee:

Science and Technology Corp. - Hampton VA
The United States of America as represented by the Administrator of the National Aeronautics and Space Administration - Washington DC

International Classification:

G06K 940

US Classification:

382274, 382260

Abstract:

The present invention is a method of processing a digital image that is initially represented by digital data indexed to represent positions on a display. The digital data is indicative of an intensity value I (x,y) for each position (x,y) in each i-th spectral band. A classification of the image based on its dynamic range is then defined in each of the images S spectral bands. The intensity value for each position in each i-th spectral band is adjusted to generate an adjusted intensity value for each position in each i-th spectral band in accordance with where W is a weighting factor, â*â is the convolution operator and S is the total number of unique spectral bands. For each n, the function F (x,y) is a unique surround function applied to each position (x,y) and N is the total number of unique surround functions. Each unique surround function is scaled to improve some aspect of the digital image, e. g. , dynamic range compression, color constancy, and lightness rendition.

US Patent:

6842543, Jan 11, 2005

Filed:

Jun 25, 2001

Appl. No.:

09/888816

Inventors:

Glenn A. Woodell - Newport News VA, US
Daniel J. Jobson - Newport News VA, US
Zia-ur Rahman - Williamsburg VA, US

Assignee:

Science and Technology Corporation - Hampton VA
The United States of America as represented by the Administrator of the National Aeronautics and Space Administration - Washington DC

International Classification:

G06T 500

US Classification:

382274, 382254, 382162

Abstract:

The present invention is a method of processing a digital image that is initially represented by digital data indexed to represent positions on a display. The digital data is indicative of an intensity value I(x,y) for each position (x,y) in each i-th spectral band. The intensity value for each position in each i-th spectral band is adjusted to generate an adjusted intensity value for each position in each i-th spectral band in accordance with where Wis a weighting factor, “*” is the convolution operator and S is the total number of unique spectral bands. For each n, the function F(x,y) is a unique surround function applied to each position (x,y) and N is the total number of unique surround functions. Each unique surround function is scaled to improve some aspect of the digital image, e. g. , dynamic range compression, color constancy, and lightness rendition.

US Patent:

8111943, Feb 7, 2012

Filed:

Apr 15, 2009

Appl. No.:

12/423907

Inventors:

Daniel J. Jobson - Newport News VA, US
Zia-ur Rahman - Williamsburg VA, US
Glenn A. Woodell - Newport News VA, US

Assignee:

The United States of America as represented by the Administrator of the National Aeronautics and Space Administration - Washington DC

International Classification:

G06K 9/40

US Classification:

382274, 382275, 382206, 382224, 382260, 382283

Abstract:

Contrast and lightness measures are used to first classify the image as being one of non-turbid and turbid. If turbid, the original image is enhanced to generate a first enhanced image. If non-turbid, the original image is classified in terms of a merged contrast/lightness score based on the contrast and lightness measures. The non-turbid image is enhanced to generate a second enhanced image when a poor contrast/lightness score is associated therewith. When the second enhanced image has a poor contrast/lightness score associated therewith, this image is enhanced to generate a third enhanced image. A sharpness measure is computed for one image that is selected from (i) the non-turbid image, (ii) the first enhanced image, (iii) the second enhanced image when a good contrast/lightness score is associated therewith, and (iv) the third enhanced image. If the selected image is not-sharp, it is sharpened to generate a sharpened image. The final image is selected from the selected image and the sharpened image.

US Patent:

59914564, Nov 23, 1999

Filed:

May 29, 1996

Appl. No.:

8/654840

Inventors:

Zia-ur Rahman - Newport News VA
Daniel J. Jobson - Newport News VA
Glenn A. Woodell - Newport News VA

Assignee:

Science and Technology Corporation - Hampton VA
The United States of America as represented by the Administrator of the
National Aeronautics and Space Administration - Washington DC

International Classification:

G06K 940

US Classification:

382254

Abstract:

A method of improving a digital image is provided. The image is initially represented by digital data indexed to represent positions on a display. The digital data is indicative of an intensity value I. sub. i (x,y) for each position (x,y) in each i-th spectral band. The intensity value for each position in each i-th spectral band is adjusted to generate an adjusted intensity value for each position in each i-th spectral band in accordance with ##EQU1## where S is the number of unique spectral bands included in said digital data, W. sub. n is a weighting factor and "*" denotes the convolution operator. Each surround function F. sub. n (x,y) is uniquely scaled to improve an aspect of the digital image, e. g. , dynamic range compression, color constancy, and lightness rendition. The adjusted intensity value for each position in each i-th spectral band is filtered with a common function and then presented to a display device.