TESTING & MEASURMENT
This can be caused due to different reflectivity levels of the surface on hills and valleys . Up till now this had to be evaluated visually which is subjective and non-repeatable . The results in Figure 7 show how the reflectivity contrast Rc distinguished the samples despite having the same colour and 60 ° Gloss . Moreover , the results of the reflectivity for hills and valleys provide details about what causes the different reflectivity contrasts .
From now on , our visual perception of colour , gloss and structure can be evaluated in a holistic and objective approach , colour and appearance harmony when combining different components can be optimized and all this is possible in the laboratory as well as on the production line with the portable spectro2profiler .
References
i Woodham , R . J . 1980 . Photometric method for determining surface orientation from multiple images . Optical Engineerings 19 , I , 139-144
Figure 7 : Reflectivity and gloss results of four leather grains of same grain type
The new measurement parameter reflectivity contrast is an ideal measure for production QC of injection or slush moulded parts .
Conclusion
spectro2profiler ( figure 8 ) is a game changer and marks a turning point in the analysis of structured surfaces . The combination of colour , gloss , 3D topography and 2D reflectivity in one easy to use instrument is a milestone in the objective measurement control of textured surfaces . At this moment , the spectro2profiler incorporates three algorithms for surface structure analysis - leather-like structures , coarse paint textures and fine paint or plastic textures . Due to its excellent technical performance in regards to repeatability and inter-instrument agreement , digital standards can be used as a reference , allowing a flawless communication within a global supply chain . ii by Meekohi - Own work , CC BY-SA 4.0 , https :// commons . wikimedia . org / w / index . php ? curid = 44925507
iii Serge Beucher and Christian Lantuéj workshop on image processing , real-time edge and motion detection ( 1979 ). http :// cmm . ensmp . fr /~ beucher / publi / watershed . pdf
iv Hunter , R . S . ( 1937 ). Methods of determining gloss . Journal of Research of the National Bureau of Standards , 18 ( 1 ), 19 – 41 .
v Qi , L ., Chantler , M . J ., Siebert , J . P ., & Dong , J . ( 2012 ). How mesoscale and microscale roughness affect perceived gloss . Edinburgh , Scotland : Lulu Press , Inc .
vi A . Nischwitz et al ., Computergrafik und Bildverarbeitung , Vieweg + Teubner Verlag | Springer Fachmedien Wiesbaden GmbH 2011
Telephone : + 44 ( 0 ) 800 9178298 Visit : www . byk-instruments . com
Figure 8 : spectro2profiler from BYK-Gardner
56 JUNE 2021 read online : www . surfaceworld . com