Method for estimating and adjusting digital image contrast

Details Method for estimating and adjusting digital image contrast Method for estimating and adjusting digital image contrast

1996-12-10

1998-10-13

Mancuso, Joseph

Image analysis

Histogram processing

With a gray-level transformation

358455, G06K 900

Patent

active

058224530

ABSTRACT:
A method of estimating the scene contrast from a digital image, the method comprises the steps of: forming a Laplacian histogram distribution; determining, from the Laplacian histogram, first and second thresholds which eliminate substantially uniform areas or a substantially textured portion of the digital image; selecting pixels which are based on the first and second thresholds from the digital image; forming a histogram from the sampled pixels; computing a standard deviation of the sampled histogram; and estimating contrast of the digital image by comparing the computed standard deviation with a predetermined contrast for determining contrast of the input image in relationship with the predetermined contrast.

REFERENCES:
patent: 4654722 (1987-03-01), Alkofer
patent: 4731671 (1988-03-01), Alkofer
patent: 4991092 (1991-02-01), Greensite
patent: 5046118 (1991-09-01), Ajewole et al.
patent: 5164993 (1992-11-01), Capozzi et al.
patent: 5410617 (1995-04-01), Kidd et al.
The Image Processing Hand-Book, 2nd Edition John C. Russ.
Numerical Analysis, 3rd Edition Richard L. Burden et al.

Affiliated with

Also associated with

Rating

Method for estimating and adjusting digital image contrast does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method for estimating and adjusting digital image contrast, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for estimating and adjusting digital image contrast will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-322043