CIE L*a*b*: comparison of digital images obtained photographically by manual and automatic modes


Autoria(s): Takatsui, Fabiana; Andrade, Marcelo Ferrarezi de; Neisser, Maximiliano Piero; Borelli Barros, Luiz Antonio; Monteiro Loffredo, Leonor de Castro
Contribuinte(s)

Universidade Estadual Paulista (UNESP)

Data(s)

20/05/2014

20/05/2014

01/11/2012

Resumo

The aim of this study was to analyze the color alterations performed by the CIE L*a*b* system in the digital imaging of shade guide tabs, which were obtained photographically according to the automatic and manual modes. This study also sought to examine the observers' agreement in quantifying the coordinates. Four Vita Lumin Vaccum shade guide tabs were used: A3.5, B1, B3 and C4. An EOS Canon digital camera was used to record the digital images of the shade tabs, and the images were processed using Adobe Photoshop software. A total of 80 observations (five replicates of each shade according to two observers in two modes, specifically, automatic and manual) were obtained, leading to color values of L*, a* and b*. The color difference (AE) between the modes was calculated and classified as either clinically acceptable or unacceptable. The results indicated that there was agreement between the two observers in obtaining the L*, a* and b* values related to all guides. However, the B1, B3, and C4 shade tabs had AE values classified as clinically acceptable (Delta E = 0.44, Delta E = 2.04 and Delta E = 2.69, respectively). The A3.5 shade tab had a AE value classified as clinically unacceptable (Delta E = 4.17), as it presented higher values for luminosity in the automatic mode (L* = 54.0) than in the manual mode (L* = 50.6). It was concluded that the B1, B3 and C4 shade tabs can be used at any of the modes in digital camera (manual or automatic), which was a different finding from that observed for the A3.5 shade tab.

Formato

578-583

Identificador

http://dx.doi.org/10.1590/S1806-83242012005000025

Brazilian Oral Research. São Paulo: Sociedade Brasileira de Pesquisa Odontologica, v. 26, n. 6, p. 578-583, 2012.

1806-8324

http://hdl.handle.net/11449/16695

WOS:000311660600015

S1806-83242012000600015.pdf

Idioma(s)

eng

Publicador

Sociedade Brasileira de Pesquisa Odontológica (SBPqO)

Relação

Brazilian Oral Research

Direitos

openAccess

Palavras-Chave #Tooth #Color Perception #Image Processing, Computer-Assisted
Tipo

info:eu-repo/semantics/article