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7.3.

Step 3: Extraction of the first and second reflections

A

mathematical algorithm

extracts the first (shine) and

second (chroma) reflection. Note that only part of the
hair tress is measured (width of the ROI) based on the
RGB specular profiles.

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Содержание Samba

Страница 1: ...Page 1 38 Samba Hair System for version 3 X User manual 11922 Jefferson Blvd Culver City CA 90230 USA Tel 310 577 8110 Fax 310 943 3280 http www bossanovatech com ...

Страница 2: ... and to the items described therein without notice Bossa Nova has taken considerable effort to ensure that the information in this manual is accurate and complete However Bossa Nova will not be liable for any technical or editorial errors or omissions made herein or for incidental special or consequential damages of any nature resulting from the furnishing of this manual or operation and performan...

Страница 3: ...rofiles 16 7 3 Step 3 Extraction of the first and second reflections 17 7 4 Step 4 Characterization of the angular profiles 19 7 5 Step 4 Computation of Lusters 20 8 Experimental Results on Hair 22 8 1 Example on different hair color 22 PART 3 Software Description 9 Getting Started 24 10 Software Architecture 25 10 1 Image visualization area 26 10 2 Data Management Tab 27 10 2 1 Data Management 27...

Страница 4: ... the system please make sure you have all the following items SAMBA sensor SAMBA laboratory setup 1 Computer Laptop or All in one Combing cylinder mount optional Regular cylinder mount 1 mini cylinder 2 combs arm 2 Ethernet cables one black one yellow 1 USB cable Power cable ...

Страница 5: ...Page 5 38 2 Assemble the mini cylinder arm a Make sure you have the arm for in vivo as well as the yellow knob b Screw the arm onto the SAMBA Sensor ...

Страница 6: ...Page 6 38 c The arm should be able to pivot toward the right hand side of the mount ...

Страница 7: ... 7 38 3 Connections Look at the back panel of the laboratory setup and connect as follows Yellow Ethernet cable Black Ethernet cable Black USB cable Power cord to 110 220VAC Sensor To PC To PC any USB port ...

Страница 8: ... vitro In vivo setup 4 1 In vitro setup Use the sensor on top of the laboratory setup Make sure you fully close the door before running a measurement Position the sensor on top of the laboratory setup using the pins ...

Страница 9: ...er they are described Handle the mini cylinder with caution Remove the sensor from the laboratory setup Unlock the arm by un screwing the yellow screw on the side Rotate the arm in the in vivo position Lock the arm in position by screwing the yellow screw on the side ...

Страница 10: ...to make sure that the fibers are aligned You can also use the back of the mini cylinder to comb the hair The part to be measured is right above the cylinder Bring the magnetic side gently to clamp the hair on one side of the cylinder Flip the cylinder to position the hair on top of the cylinder groove Make sure the hair is not messy ...

Страница 11: ... Bring the sensor with the arm mounted close to the mini cylinder The help of someone is highly recommended for this step Clamp the cylinder onto the arm mount Once ready push the button to start the measurement Hold still until the measurement is done ...

Страница 12: ...lar and the diffused light The specular reflection gives information about how glossy or rough the hair is The diffused light will bring information about the hair color SAMBA acquires two states of polarization at video rate The diffused and specular images can then be calculated as follows The diffused image Id 2 x Ic The specular image Isp Ip Ic where Ip is the light from the first state of pol...

Страница 13: ...ferent types of light are observed The first reflection also called shine is a white polarized surface reflection It carries the same polarization as the incident light The second reflection also called chroma is a colorful polarized reflection coming from the bottom surface of hair The diffused light hair color consists of unpolarized light coming from the internal scattering Light scattering in ...

Страница 14: ...zation The angle between the illumination and the camera axis is around 10 deg Combining imaging to a cylinder and knowing the system geometry distances cylinder diameter allows to record angular profiles from 45 to 45 deg angle between the camera and the specular reflection in one single measurement ...

Страница 15: ...raged parallel image 1 we obtain the averaged specular image 3 The diffused image 4 corresponds to twice the crossed image 2 The sum of the parallel image and the crossed images corresponds to the intensity image 5 which is the image a classical camera would give All the images are acquired with a 12 bit depth resolution The size of the images is 582 width by 782 length pixels To each pixel corres...

Страница 16: ...level in the reference target The normalization target consists of a gray gloss tile This allows to compensate for any drift of the light power Therefore the measurements are highly reproducible and stable in time The profiles are unitless They can be seen as the reflectance of hair Averaging of the crossed sections along the ROI width Specular 3 Region Of Interest ROI Reference Target Glossy gray...

Страница 17: ...traction of the first and second reflections A mathematical algorithm extracts the first shine and second chroma reflection Note that only part of the hair tress is measured width of the ROI based on the RGB specular profiles ...

Страница 18: ...rom the RGB specular profiles It then removes this information to the luminance of the specular profiles to obtain the first reflection profile Finally this signal is removed from the RGB specular profiles to obtain the RGB profiles of the second reflection No mathematical fit is used during this process Complete decomposition of light into shine chroma and diffused light ...

Страница 19: ... profiles θ0 deg half width of the peak at Max e note e 2 72 Integral mathematical integral area under the curve Wvisual deg this parameter is computed on the specular image and not on the specular profile Wvisual is the averaged width of the specular band along the ROI width When looking at hair the human eye follows the change of the shine band due to the shape of the object By measuring Wvisual...

Страница 20: ...g angle between the center of the image 0 angle and the Max of the chroma profile Δ shine deg angle between the max of the shine and the max of the chroma 7 5 Step 4 Computation of Lusters From the characterization of the specular and diffused profiles we compute different luster formulae In all the following formulae S and D are the integral values from the specular and diffused profiles respecti...

Страница 21: ...meter instead of Theta0 for the width of the specular peak The formula works on every hair color On light hair Sout is negligible compared to D so the formula is equivalent to the Reich Robbins one visual in BNT W D S L 1 100 On dark hair D is negligible so the Luster is equivalent to a measurement of contrast between the outside area and the inside area of the peak with the additional influence o...

Страница 22: ...ry dark hair the chroma and diffused are negligible whereas on blond hair the chroma and the diffused become more and more important It is interesting to see that for untreated hair the amount of shine is roughly the same This is consistent with the fact that the shine comes from the external reflection Black Brown Red Angle deg Angle deg Angle deg Intensity Diffused a u ...

Страница 23: ...Page 23 38 Blond Bleached Gray Angle deg Angle deg Angle deg ...

Страница 24: ...sage appears when the software is launched LIVE MODE If you want to perform measurements select Live measurement Load Data It will check the connections with the motor and the camera and enable the acquisition of images LOAD MODE If you only want to open and analyze saved measurements click on Load Data Ony If the camera or the motor is not connected while you choose the Live mode an error message...

Страница 25: ...n 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 ...

Страница 26: ...filter you choose Disabled in Load Mode Parallel Crossed Tab Select the polarized filter Parallel or Crossed you want to put in front of the camera for the display Disabled in Load Mode ROI Width slider Select the width of the ROI for the analysis Minimum is 100 pixels maximum is 300 pixels The ROI is always centered on the image Advanced User only Update Analysis button Launch a new analysis on a...

Страница 27: ... measurements are saved in a folder named SAMBA DATA located by default on the desktop of the computer or in your application folder It is separated into 3 subdivisions Study Sub folder and Measurement You can manage all your measurements from the Data Management tab ...

Страница 28: ...ment Move Sub folder and Measurement 10 2 2 Preview When you select a measurement you obtain a preview of the measurement you made in the bottom left corner of the tab Image preview The parallel and the crossed images of your measurement are displayed Luster preview Once a measurement has been analyzed a luster preview is available You can display the luster values from the 5 equations available C...

Страница 29: ...in Load mode Launch the analysis of all the measurements you selected Display the results in the analysis tab To select several measurements at the same time use CTRL Click or CTRL SHIFT Click Launch a new measurement A window will open to ask for the name of the new measurement Enable disable the automatic incrementation of the name of your measurement The increment number is visible in the windo...

Страница 30: ... available in the Data Analysis tab All the measurements that have been analyzed are displayed in the list in the top left corner of the analysis tab You can remove one or several item s from the list by using the button Selecting a measurement in this list will display the images profiles and numerical data associated with this measurement ...

Страница 31: ...ty from the specular shine chroma and diffused components in luminance red green and blue It also displays the profile of the specular band center and width along the horizontal direction You can right click on the profiles displaying the light intensity components to copy the image of the graph or the data to the clipboard The Numerical Data tab displays the luster values and profiles characteris...

Страница 32: ...ents are displayed in the list in the top left corner of the analysis tab You can select up to 10 measurements for comparison by using the control The measurements you chose to display are visible in the Measurement displayed list underneath You can remove one or several item s from either of those two lists by using the button Images profiles and data are displayed in the right section of this ta...

Страница 33: ...are normalized by the exposure time relatively to the image with the greatest exposure time This allows comparing images directly on the screen Colored images They use the normalized or non normalized images and add a color coding to them The user can adjust the dynamic of the color coding low intensity blue to high intensity red He also has the choice of Normalized Non normalized by clicking on t...

Страница 34: ...analysis tab you can copy the data or the image of the graph in your clipboard by right clicking on the graph that you are interested in The Numerical data tab displays on the same table the luster values and profiles characteristics You can select a reference measurement You can choose a reference by selecting a measurement in the Displayed list and click on the green cross This will display all ...

Страница 35: ... You can then select the folder where you want to save all your data It consists of Images one sub folder for every measurement containing an intensity a specular and a diffused image Data one excel sheet for all your measurements with all the numerical data and profiles data 10 5 Menu A menu is available on the top left corner of the software window The options are File Exit Close the software Sy...

Страница 36: ...ly by a BNT employee please contact BOSSA NOVA Technologies for specific information on the White Balance procedure Help User Manual Open the User Manual About Display BOSSA NOVA Technologies contact information 10 5 1 Hardware Check The hardware check window is preferably not to be used by anyone than a BNT employee or an advanced user The hardware check window displays Labview informations Versi...

Страница 37: ...menu bar the following window will open You should Set up the calibration sample black glossy target provided on the middle groove of the cylinder so you can see it on the live image Make sure that the paper strip is sitting flat on the cylinder and that there is no finger prints or dust on it Remove all other samples Close door Once completed the following window will open ...

Страница 38: ...centered at 0 deg middle of the image The Camera focus checks the focus of the camera by looking at the width of the shine band on the black glossy paper strip The Parallel Light and Crossed Light checks the illumination of the LED bar compared to its initial value What to do if the one or more check point s does not pass Send the calibration report saved in the SAMBA System Checks folder to info ...

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