High-resolution vision system for hair fiber diameter / ellipticity measurement and 3D reconstruction

1. Fiber Diameter and Ellipticity
BOSSA NOVA VISION, California
Robert George - Sebastien Breugnot
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

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. Human hair diameter can vary from 17 to 180
microns :
» Ethnicity
» Age
» Genetics
Measuring hair fiber diameters :
 is important for hair type classification
 is an essential parameter to study its
mechanical properties (torsion,
elasticity, etc..) or its density/porosity
properties.
Fiber diameter measurement
3
Image from belgraviacentre website :
https://www.belgraviacentre.com/blog/shrinking-hair-
shaft-diameter-during-hair-transplants
Introduction

4. 4
Microscopic vision Laser scanning
Image from :
https://www.mitutoyo.co.jp
No measurement of
diameter across the whole
fiber length/revolution
No ellipticity
Doesn’t work on
transparent fiberImage from :
http://www.microlabgallery.com
Fiber diameter measurement
Current techniques
Fast measurement of the diameter
of the shape obstructing the laser sheet
Use of microscopic calibrated images
to measure fiber diameter
Does not provide
any image of the
fiber
Drawbacks
Drawbacks

5. Bolero Mono : Hardware
5

6. 6
Bolero Mono : Hardware
Camera
WhiteLEDPanel
Rotation stage
Fiber
Setup
Fiber

7. 7
Bolero Mono : Hardware
Auto-centering and focus
1. of fiber position
2. of camera focus
Automatic adjustment
1
2
Acquisition of 18
images of the fiber
Automatic measurement
3D model
Numerical Data

8. 8
Bolero Mono : Software
InterfaceAnalysis selectionLive Image
Measurements

9. 9
Bolero Mono : Software
Interface
Analysis selection
 Volume measurement :
Full analysis with the acquisition of 18 images
 Single Image Analysis
Analysis on a single image
Orientation is set by the user
Data selection
 Data Management :
Manage data to be saved and processed
User can create/delete/copy/rename/etc.
different folder and measurement.
 Data Analysis :
Analysis, comparison and export of data
 Data Visualization :
Visualize the results of a single selected
measurement

10. 10
Bolero Mono : Software
Numerical results (1)
Fiber diameter along
the hair main axis

11. 11
Bolero Mono : Software
Numerical results (2)
Fiber diameter depending on orientation Overall average :
 Minimum diameter
 Maximum diameter
 Ellipticity
Same fiber – 4 measurements

12. 12
Bolero Mono : Software
Numerical results (3)
At each Z-position :
 Minimum diameter
 Maximum diameter
 Ellipticity
 Slice shape
 Slice surface
Same fiber – 4 measurements

13. 13
Bolero Mono : On-going development
Automatic-loading system
(retro-fit with current system)
Fiber swelling measurement
(no retro-fit with current system)
Cuvette
After immersion in liquid, the swelling of the
fiber can be measured

14. Conclusions
 BOLERO Mono is a robust, turn-key system whose
aim is to provide reliable diameter and ellipticity
measurement for all type of fibers
 BOLERO Mono can deliver a 3D model of a hair
fiber as well a repeatable numerical data
 Data management, comparison and export is very
easy thanks to a user friendly software
14

15. 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
: