公开(公告)号：US07020333B2

公开(公告)日：2006-03-28

申请号：US10087831

申请日：2002-03-05

Applicant: Seung-joon Yang ,  Kyng-sun Min

Inventor： Seung-joon Yang ,  Kyng-sun Min

IPC: G06K9/00

CPC classification number: H04N1/4074 ,  G06T5/009 ,  G06T5/40 ,  G06T7/11

Abstract: An apparatus and method are provided to equalize a histogram using a cumulative distribution function (CDF) of an image. A model parameter estimator estimates parameters from the image using a Gaussian model. An error function storing unit stores error function values based on a Gaussian distribution. A CDF calculator calculates a CDF using one of the error function values from the error function storing unit and the estimated parameters. A histogram equalizer performs histogram equalization using the CDF.