cosmetic gloss measurement vert3
DESCRIPTION
TRANSCRIPT
1 04/02/2008
In Vivo Quantitative Evaluation of Gloss
藥妝 真 .晶砂
真異典藏--芳香療法、手工皂與化妝品DIY的研究世界
2 04/02/2008
Abstract
Key words – gloss, shine, skin, hair, light, scattering, polarization, imaging
Differentiates components of scattered light
Use real time polarization analysis technique
Enables in vivo quantitative evaluation of gloss from hair & skin
Quality control & claims substantiation
3 04/02/2008
Introduction
Cosmetic manufacturers need..
Quantify visual appearance of products
Improve performance, quality & reproducibility
Substantiate claims
Accurately to study skin and hair
In vivo non-contact testing provides the most meaningful results.
4 04/02/2008
Color and GlossScattered light can be divided into three categories…
Mirror-like reflected
light (specular reflection)
( 鏡像反射光或鏡像反射 )
Volume scattering(體積散射)
Surface scatteritng(表面散射)
5 04/02/2008
Degrees of Gloss
Definition Ranging
Gd
specular light
/
total reflected light (%)
0% (low gloss)
~
100%
(high gloss)
Gd*
specular light
:volume-scattered li
ght
0 (low gloss)
~
∞ (high gloss)
6 04/02/2008
Operating Principle
Light scattered exhibits various polarization signatures
Based on differentiating and measuring the types of scattering events.
Using a polarimetric camera with a high polarization contrast parameter value at a fast video rate
Measure specular light, surface-scattered light, and volume-scattered light
Processed and combined to provide accurate and consistent gloss values Gd and Gd*
7 04/02/2008
Experimentation
PolarimetricCamera
PolarizedIllumination
Image acquisition & processing
8 04/02/2008
Result
In vivo gloss measurement of foundations
05
101520253035404550
Gd Matte1 Matte3 Matte5 Bareskin
Glossy2
Foundations
9 04/02/2008
Uncombed
Combed
Referenceconditioner
ShineImprove
conditioner
ShineImproved
conditioner+ polish
0
1
2
3
4
5
6
7
8
Gd*
Result
Efficiency testing of hair product
10 04/02/2008
Result
Gloss distribution
11 04/02/2008
Advantages to Gloss Measurement
New Technique
Independent of texture and shape
Correlated to human eye assessment
High accuracy & High consistency
Limitation is repositioning of the object.
12 04/02/2008
Conclusion
The described imaging technique opens…
• Possibility of measuring objectively the gloss of textured, complex 3D objects.
• Well adapted for the cosmetic industry to formulate, evaluate products and substantiate claims.
13 04/02/2008
References
• 1. S Breugnot, L Le Hors, D Dolfi and P Hartemann, Phenomenological• ModelofPaintsforMultispectralPolarimetricImaging, Orlando: Aerosense• (2001)• 2. HC Van De Hulst, Light Scattering by Small Particles, New York: Dover• (1981)• 3. The Munsell Book of Color, Baltimore, MD: Munsell Color Company• (1976)• 4. E Collett, Polarized Light, New York: M Dekker, Inc (1993)• 5. M Rowe, EN Pugh Jr, JS Tyo and N Engheta, Polarization difference• imaging: A biologically inspired technique for observation through• scattering media, Optics Letters 20(6), 608-610 (Mar 15, 1995)• 6. S Breugnot and P Cl menceau, Modeling of a polarization active imager• at y-806 nm, Optical Engineering 39(10) 2677-2680 (Oct 2000)• 7. R McMullen, J Jachowicz, Optical properties of hair: Effect of treatments• on luster as quantified byimage analysis, J CosmetSci54 335-351 (July/• Aug 2003)• 8. R Korichi, Video imaging in the measurement of makeup • efficacy and performance, Cosmet Toil 117(10) 39-48 (2002)