Statistical design of experiments applied on sparkle visual detection

摘要

In this work, we have focused on analyzing how differentrnvariables affect in the process of detecting the sparkle texture effect,rnsince there are few works related to this issue. A large number ofrnsamples were available with different characteristics depending onrnthe needs of each psychophysical experiment. The studiedrnparameters were structural variables such as pigment type, size andrnconcentration, and environmental variables such as illuminationrnand viewing conditions.rnDue to the large sample number, the design of experimentsrn(DoE) was applied to optimize the psychophysical experiments andrnto evaluate which variables affect individually on the sparklerndetection, as well as if there are interactions among them. Afterrncollecting all the information from the psychophysical experiments,rnwith more than 35.000 visual assessments performed, therncorrelation with the instrumental data of the BYK-mac was verifiedrnto corroborate its reliability.rnIt has been possible to demonstrate the influence of multiscalernparameters on the sparkle appearance and to extract whichrnvariables affect to a greater extent when detecting the sparklerntexture effect. This issue was fundamental because, there was nornprevious study addressing these issues, which was of vitalrnimportance for the industry to analyze how the sample texture isrndetected depending on various conditions, whether structural,rnenvironmental, etc.rnIn addition, a reliable and applicable methodology has beenrnimplemented for other types of existing goniochromatic pigmentsrnwith novel texture effects. It has been possible to implement therndesign of experiments as a main tool to limit the visual experimentsrnto be performed, making the fewest visual evaluations possible andrnobtaining the maximum results.rnThanks to psychophysical experiments, it has been successfullyrntested the visual and instrumental correlation of sparkle detectionrnbetween the only multi-angle device on the market to date, and thernvisual assessments obtained from a large number of observers.