Polarization system enabling specular and diffusion images separation for hair shine measurement on hair swatch. Application for all products claiming hair shine improvements.

1. 5777 W. Century Blvd
Suite 205 - LOS ANGELES
CA 90045 USA
Tel: +1 (424)-393-4011
Fax: +1 (310) 943-3280
SAMBA Hair System
BOSSA NOVA VISION, California
Robert George - Sebastien Breugnot
Objective measurement of parameters
involved in the visual appearance of hair
www.bossanovavision.com
info@bossanovavision.com

2. Overview of Bossa Nova Vision
BOSSA NOVA Vision, formerly BOSSA NOVA
Technologies, is a LLC (Limited Liability
Company) founded in 2018, located in Los
Angeles, USA
Small business of 4 people specialized in
optics, electronics, imaging and software
development (3 PhDs, 1 Engineer)
LAX
Los Angeles
International Airport
2

3. Luster
ShapeColor
What is Luster ?
Visual appearance of hair
is a combination of…
Problematic
Measuring the parameters and correctly quantifying Luster
3

4. What is Luster ?
Luster sensation is considered to depend on 3 main parameters:
Luster qualifies the visual appearance of the object
Luster is strongly linked to the idea of quality and beauty of an object
Scientists have tried to compute a parameter that would quantify the
visual luster sensation*
The amount of reflected
light
The sharpness of the
reflection
The background on which the
reflection is observed
The more reflected light there is,
the higher the luster is
The sharper the reflection is,
the higher the luster is
The darker the background is,
the higher the luster is
Higher
luster
Higher
luster
Higher
luster
4

5. Several Luster formulae have been developed and published* by scientists
using goniometers and other instruments to tentatively quantify human perception of Luster
Examples of formulae :
𝑳 𝑹𝒆𝒊𝒄𝒉−𝑹𝒐𝒃𝒃𝒊𝒏𝒔 =
𝑺
𝑫 × 𝜽 𝟏/𝟐
𝑳 𝑻𝑹𝑰 =
𝑺
𝑺+𝑫
∙
𝜽 𝒓𝒆𝒇
𝜽 𝟏/𝟐
𝑳 𝑩𝑵𝑻 =
𝑺 𝒊𝒏
(𝑫 + 𝑺 𝒐𝒖𝒕)×𝑾 𝒗𝒊𝒔𝒖𝒂𝒍
The parameters used in the formulae are :
o S the total amount of the specular light
 Reflected Light
o D the total amount of the diffused light
 Background Light
o θ1/2 the width of the specular light distribution
 Light band Sharpness
* Lefaudeux, N & Lechocinski, N & Clemenceau, P & Breugnot, S. (2010).
New luster formula for the characterization of hair tresses using polarization imaging.
International journal of cosmetic science. 32. 157. 10.1111/j.1468-2494.2010.00534_7.x.
* REICH, CHARLES & R. ROBBINS, CLARENCE. (1993)
Light scattering and shine measurements of human hair: A sensitive probe of the hair surface.
J. Soc. Cosmet. Chem.. 44.
What is Luster ?
5

6. White Shine band
Color chroma band
Diffused light
Diffused light
Example on mannequin heads
Incident light splits into shine, chroma
(specular) and diffused
Diffused and chroma carry color
information
Luster is highly related to the
background color (diffused), surface
quality and the hair style / alignment
of the fibers
6
Specular & Diffused Light

7. Linear
Circular
EllipticIncident light splits into
Specular and Diffused
Interaction of light with hair fibers
Front-side / Back-side
Shine / Chroma
Each light component has
its own polarization
characterictics
7
Introduction on polarization imaging

8. Light source
(un-polarized)
Polarizer-State
Generator (PSG)
Hair sample
Linear
polarization
Front-side reflection
Elliptical polarization
(linear to circular depending on the
orientation between incident light
polarization and hair orientation)
Back-side reflection
Un-polarized
Diffused
Polarizer-State
Analyzer (PSA)
Camera
8
Introduction on polarization imaging

9. Elliptical polarization
(linear to circular depending on the
orientation between incident light
polarization and hair orientation)
Linear
polarization
Un-polarized
Front-side reflection Back-side reflection Diffused
Linear
polarization
Un-polarized
DiffusedSpecular Specular and Diffused
can be separated with 2
Polarizer-State Analyzer
(PSA)
=
SAMBA
Hair System
Hair fibers orientation
=
Polarizer-State
Generator orientation
9
On forced aligned hair

10. The setup used is based on three main elements:
• A polarized illumination (2)
• A cylinder on which the sample is positioned
(3)
• A polarization camera (1)
Polarized illumination and polarization camera
allow the independent measurements of
reflections and diffusions
Cylinder is used to record angular distribution
profiles
10
SAMBA Hair system set-up

11. 0
5
10
15
20
25
30
35
40
45
50
-45 -30 -15 0 15 30 45
Normalizedunits
Angle (deg)
L
R
G
B
0
1
2
3
4
5
6
-45 -30 -15 0 15 30 45
Normalizedunits Angle (deg)
L
R
G
B
Averaging
along the
hair tressCross sections
Specular image Diffused image
Specular angular distributions
(Luminance and color)
Diffused angular distributions
(Luminance and color)
Characterization of the profiles
with numerical parameters such as
maxima, integrals and width LUSTER
11
Profile extraction

12. INTENSITY SPECULAR DIFFUSED
Shine band Chroma band
Mathematical decomposition of
specular into shine and chroma
based on color information
Calculation of luster parameters such as Reich-Robbins, TRI, Bossa Nova Tech
12
Separation of shine and chroma

13. Dark
a.u.
Angle (deg) Angle (deg) Angle (deg) Angle (deg)
• On untreated healthy hair, the shine (surface
reflection) is comparable for all samples
• As the hair becomes brighter, the chroma
(internal reflection) increases as well as the
diffused light
• Chroma and diffused (carrying color
information) play an important part on the
visual appearance
Gray
Intensity
Diffused
Brown
Copper
Blond
Black
Bleached
13
Examples on different hair colors

14. 14
1. Image visualization area : you can
select your filter (Parallel/Crossed),
the size of the Region of Interest
(ROI), change live/load mode and
visualize your sample
2. Data Management Tab : you can
create/delete/rename/move/copy
your folders and measurements,
preview a selected measurement
and launch new acquisition and
analysis
3. Data Analysis : you can visualize all
the parameters (images, profiles,
numerical data) of the
measurement you loaded from the
Data Management tab
4. Data Comparison and Export : you
can compare up to 10 of your
measurements, and export your
data you loaded from the Data
Management tab
5. Menu : you can launch calibration
and check-up procedures
Software Interface

15. 15
Measurement
selection
Measurement
preview
Acquisition and
processing
Software Interface

16. Profiles
16
Numerical
Data
Visual comparison of
Samples
Profile and Numeric
comparison of Samples
Software Interface - (Analysis / Comparison)

17. 17
Export to MS Excel

18. 18
Export images for reports/presentations

19. IN VITRO:
Sensor is on the laboratory setup.
Measurements are made on hair
tresses mounted on a cylinder
IN VIVO:
Sensor is held by the user.
Measurements are made on a
consumer’s head thanks to a
mini-cylinder attachment
19
In-vitro and in-vivo measurements

20. Observations:
On the non-treated hair:
• the first and second reflections are well separated
• The first reflection is shifted towards the negative angles. This is due to the cuticle
of hair.
On the treated hair:
• The first and second reflections now overlap.
• The first and second reflections are now centered on the zero angle position. The
treatment filled the cuticle and the hair surface is now smooth.
• The shine slightly widened
• The Chroma width decreased significantly and the maximum increased. The
integral did not change much.
• The hair appears darker. The diffused light decreased.
20
Example – Study of a hair treatment

21. 21
Example – Study of a hair treatment

22. SAMBA Hair System
Conclusions
 SAMBA Hair is a robust, turn-key system for Shine, Chroma,
Diffuse and Luster quantification
 SAMBA allows for in-vitro and in-vivo type of measurement
 Data management, comparison and export is very easy
thanks to a user friendly software
22

23. 5777 W. Century Blvd
Suite 205 - LOS ANGELES
CA 90045 USA
Tel: +1 (424)-393-4011
Fax: +1 (310) 943-3280
www.bossanovavision.com
info@bossanovavision.com
Thank you !
For further questions
feel free to contact us
: