A contrast correction method for dental images based on histogram registration

Economopoulos, TL; Asvestas, PA; Matsopoulos, GK; Grondahl, K; Grondahl, H-G

dc.contributor.author	Economopoulos, TL	en
dc.contributor.author	Asvestas, PA	en
dc.contributor.author	Matsopoulos, GK	en
dc.contributor.author	Grondahl, K	en
dc.contributor.author	Grondahl, H-G	en
dc.date.accessioned	2014-03-01T01:32:26Z
dc.date.available	2014-03-01T01:32:26Z
dc.date.issued	2010	en
dc.identifier.issn	0250-832X	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/20130
dc.subject	Contrast correction	en
dc.subject	Dental imaging	en
dc.subject	Histogram reshaping	en
dc.subject	Registration	en
dc.subject	Subtraction radiography	en
dc.subject.classification	Dentistry, Oral Surgery & Medicine	en
dc.subject.classification	Radiology, Nuclear Medicine & Medical Imaging	en
dc.subject.other	algorithm	en
dc.subject.other	article	en
dc.subject.other	comparative study	en
dc.subject.other	human	en
dc.subject.other	image processing	en
dc.subject.other	image quality	en
dc.subject.other	image subtraction	en
dc.subject.other	methodology	en
dc.subject.other	statistics	en
dc.subject.other	theoretical model	en
dc.subject.other	tooth radiography	en
dc.subject.other	Algorithms	en
dc.subject.other	Humans	en
dc.subject.other	Image Processing, Computer-Assisted	en
dc.subject.other	Models, Theoretical	en
dc.subject.other	Radiographic Image Enhancement	en
dc.subject.other	Radiography, Dental, Digital	en
dc.subject.other	Subtraction Technique	en
dc.title	A contrast correction method for dental images based on histogram registration	en
heal.type	journalArticle	en
heal.identifier.primary	10.1259/dmfr/57585722	en
heal.identifier.secondary	http://dx.doi.org/10.1259/dmfr/57585722	en
heal.language	English	en
heal.publicationDate	2010	en
heal.abstract	Contrast correction is often required in digital subtraction radiography when comparing medical data acquired over different time periods owing to dissimilarities in the acquisition process. This paper focuses on dental radiographs and introduces a novel approach for correcting the contrast in dental image pairs. The proposed method modifies the subject images by applying typical registration techniques on their histograms. The proposed histogram registration method reshapes the histograms of the two subject images in such a way that these images are matched in terms of their contrast deviation. The method was extensively tested over 4 sets of dental images, consisting of 72 registered dental image pairs with unknown contrast differences as well as 20 dental pairs with known contrast differences. The proposed method was directly compared against the well-known histogram-based contrast correction method. The two methods were qualitatively and quantitatively evaluated for all 92 available dental image pairs. The two methods were compared in terms of the contrast root mean square difference between the reference image and the corrected image in each case. The obtained results were also verified statistically using appropriate t-tests in each set. The proposed method exhibited superior performance compared with the well-established method, in terms of the contrast root mean square difference between the reference and the corrected images. After suitable statistical analysis, it was deduced that the performance advantage of the proposed approach was statistically significant. Dentomaxillofacial Radiology (2010) 39, 300-313. doi: 10.1259/dmfr/57585722	en
heal.publisher	BRITISH INST RADIOLOGY	en
heal.journalName	Dentomaxillofacial Radiology	en
dc.identifier.doi	10.1259/dmfr/57585722	en
dc.identifier.isi	ISI:000279343500008	en
dc.identifier.volume	39	en
dc.identifier.issue	5	en
dc.identifier.spage	300	en
dc.identifier.epage	313	en