In-Vivo Hair Shine Analysis
VIVO / VITRO
Our imaging technology enables analysis of light on any kind of in-vivo or in-vitro hair samples
Image your hair sample - head or swatch - in just a few seconds
PLUG & PLAY
No special installation is needed - easy cabling and the system is ready to go
Hair shine is usually measured in a constrained environment. Even our SAMBA Hair needs a hair sample to be put on a cylindrical geometry to correctly separate the light components, and to ensure that a shine band is visible and that we can compute a luster coefficient.
The TANGO system relies on a different and innovative polarization imaging technique to separate the different components of the light reflected and diffused by hair fibers without having to constrain the fibers in any way. Therefore, the TANGO system enables the analysis of shine in more diverse conditions (specific haircut, ethnic fibers, etc.) than the usual technique.
The TANGO system enables the separation of the components of light coming from a hair fiber which are :
- External reflection (or Shine)
- Internal reflection (or Chroma)
The TANGO uses a method based on the polarization signature carried by each component. This method requires the use of a pulsed polarized illumination system coupled with a polarization analysis imaging system
The illumination system goes through a Polarization State Generator (PSG). As a result, the emitted light is polarized, its polarization state being controlled by the PSG. Light coming back from the illuminated sample goes through a Polarization State Analyzer before going to the imaging system (video camera).
To separate the three components, N images are acquired (N≥4), corresponding to N couple of polarization states (PSGN, PSAN). The acquisition of each image and the control of PSG and PSA is done using a computer. The N acquired images are then analyzed and processed to separate the contributions for each pixel of the image.
Some examples of the resulting processed images are shown below. Three hair swatches of blond, brown and black colors have been put on a cylinder. The shine and chroma bands, as well as the diffused light are perfectly separated.
Below are the images obtained on a single mannequin head, for which the TANGO enables separation of Shine, Chroma and Diffused.
(230mm x 220mm x 220mm)
Processed images (32 or 64 bits)
Excel for numerical data
In-vivo or vitro