Creating and Projecting Fringes
Laboratory of Optoelectronics, University of Brescia
2D Vision Course
Alessandro Nastro
Purpose of the project:
 Implement an optic triangulation system and
develop a VI to create fringes and project
them.
α
Data:
α = 30°
γ = 90°
FW =
400mm
FH = 300mm
Alessandro Nastro
Instrumentation:
 Projector Philips PicoPix PPX2055
• Display technology..................................WVGA 0,3" DLP
• Light source............................................................RGB
LED
• Resolution......................................... 854×480 pixel
(16:9)
• Screen distance........................................... 0,5 m up to 3
m
• Power Supply ....................................................via USB Y
plug
• Brightness (Bright Mode) ......................... up to 55
lumen
• Projected image size........................................12–120
inch (30-304 cm)
• Dimensions (L×H×W)............................72×27×72mm
• Weight........................................................................0,11
5kg
• Camera Basler Scout scA1390-17gm
• Sensor……………………………………………………………………….
ICX267AL
• Sensor
type……………………………………………………………………….. CCD
• Sensor diagonal Diagonal............................................. 8
mm (Type 1/2)
• Resolution………………………………………………………… 1392 x
1040 pixel
• Pixel width……………………………………………………………………
4.65 μm
• Pixel
height…………………………………………………………………….4.65
μm
• Transfer type……………………………………………………….
Interline transfer
• Interface type…………………………………………………….. Gigab
Ethernet
• Indication of lens category to be
used……………………………….. C-Mount
Alessandro Nastro
Implementation :
𝑆𝑆𝑥 = 𝑁. 𝑃𝑖𝑥𝑒𝑙𝑥 ∗ 𝑃𝑖𝑥𝑒𝑙 𝑊𝑖𝑑𝑡ℎ =
= 1392 ∗ 4.65μ𝑚 = 0.0065𝑚
𝑓
𝑑−𝑓
= so
𝑆𝑆𝑥 𝐹𝑂𝑉𝑥
d=
(𝐹𝑜𝑣𝑥 + 𝑆𝑆𝑥)
∗f=
𝑆𝑆𝑥
(0.4𝑚 + 0.0065𝑚)
=
∗ 0.025𝑚 =
0.0065𝑚
= 1,5699 m
f [mm]
d [mm]
8
500
16
1005
25
1569,9
35
2190
50
3139,9
300
Distance
(mm):
156,9
Alessandro Nastro
VI steps:











Load Master and Calibration info
Acquire Master and calculate calibration info
Save Calibration info
Create and Save viewfinder Image
Project Acquire and Save viewfinder Image
Create and Save a Fringes Patterns
Project Acquire and Save Fringes pattern
Create, Project, Save a Series of Fringes Images
Apply Calibration on the acquired image
Use line profile at a specific line
Determinate Period (pix, mm)
Alessandro Nastro
Structure of the VI
 Producer-Consumer VI
 2 State-Machine: - 7 state (Init, idle,
calibration, center, fringes, application of
Calibration, Stop)
 - 3 state (Idle, Analysis, Stop)
 6 SubVI: Calibration
Center
Fringes
AutoFringes
LineProfile
Monitor
Alessandro Nastro
Monitor SubVI
Alessandro Nastro
AutoFringes SubVI
Alessandro Nastro
Fringes State: Front Panel
Alessandro Nastro
Fringes State: Block Diagram
Alessandro Nastro
Application:
 This technique of projecting fringes can be used in a scanner 3D.
Alessandro Nastro