<rdf:RDF xmlns:rdf="http://www.openarchives.org/OAI/2.0/rdf/" xmlns:ow="http://www.ontoweb.org/ontology/1#" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:ds="http://dspace.org/ds/elements/1.1/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:doc="http://www.lyncode.com/xoai" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/rdf/ http://www.openarchives.org/OAI/2.0/rdf.xsd">
   <ow:Publication rdf:about="oai:digibug.ugr.es:10481/76376">
      <dc:title>Optimizing Parametric Factors in CIELAB and CIEDE2000 Color-Difference Formulas for 3D-Printed Spherical Objects</dc:title>
      <dc:creator>He, Ruili</dc:creator>
      <dc:creator>Melgosa Latorre, Manuel</dc:creator>
      <dc:subject>Color difference</dc:subject>
      <dc:subject>3D object</dc:subject>
      <dc:subject>Visual assessment</dc:subject>
      <dc:subject>CIELAB</dc:subject>
      <dc:subject>CIEDE2000</dc:subject>
      <dc:subject>Optimization</dc:subject>
      <dc:description>The current color-difference formulas were developed based on 2D samples and there is&#xd;
no standard guidance for the color-difference evaluation of 3D objects. The aim of this study was&#xd;
to test and optimize the CIELAB and CIEDE2000 color-difference formulas by using 42 pairs of&#xd;
3D-printed spherical samples in Experiment I and 40 sample pairs in Experiment II. Fifteen human&#xd;
observers with normal color vision were invited to attend the visual experiments under simulated&#xd;
D65 illumination and assess the color differences of the 82 pairs of 3D spherical samples using the&#xd;
gray-scale method. The performances of the CIELAB and CIEDE2000 formulas were quantified&#xd;
by the STRESS index and F-test with respect to the collected visual results and three different&#xd;
optimization methods were performed on the original color-difference formulas by using the data&#xd;
from the 42 sample pairs in Experiment I. It was found that the optimum parametric factors for&#xd;
CIELAB were kL = 1.4 and kC = 1.9, whereas for CIEDE2000, kL = 1.5. The visual data of the 40 sample&#xd;
pairs in Experiment II were used to test the performance of the optimized formulas and the STRESS&#xd;
values obtained for CIELAB/CIEDE2000 were 32.8/32.9 for the original formulas and 25.3/25.4 for&#xd;
the optimized formulas. The F-test results indicated that a significant improvement was achieved&#xd;
using the proposed optimization of the parametric factors applied to both color-difference formulas&#xd;
for 3D-printed spherical samples.</dc:description>
      <dc:date>2022-07-27T10:37:25Z</dc:date>
      <dc:date>2022-07-27T10:37:25Z</dc:date>
      <dc:date>2022-06-07</dc:date>
      <dc:type>journal article</dc:type>
      <dc:identifier>He, R... [et al.]. Optimizing Parametric Factors in CIELAB and CIEDE2000 Color-Difference Formulas for 3D-Printed Spherical Objects. Materials 2022, 15, 4055. [https://doi.org/10.3390/ma15124055]</dc:identifier>
      <dc:identifier>http://hdl.handle.net/10481/76376</dc:identifier>
      <dc:identifier>10.3390/ma15124055</dc:identifier>
      <dc:language>eng</dc:language>
      <dc:relation>info:eu-repo/grantAgreement/EC/H2020/814158</dc:relation>
      <dc:rights>http://creativecommons.org/licenses/by/4.0/</dc:rights>
      <dc:rights>open access</dc:rights>
      <dc:rights>Atribución 4.0 Internacional</dc:rights>
      <dc:publisher>MDPI</dc:publisher>
   </ow:Publication>
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