Microscan Visionscape FrontRunner - Page 139

Advanced Lighting
Creating a Good
Image
A
v4.1.3, April 2012 Visionscape FrontRunner™ User’s Manual A-13
• Significantly enhances image quality
• Improves the accuracy and repeatability of machine vision
performance on specular surfaces
• Illumination sources include LED, fiber-optic and micro-fluorescent
sources
• Flexible light-field / dark-field illumination characteristics depending
on distance to target
FIGURE A–11. Diffused On-Axis Lighting
CDI
Ideal for very uneven specular surfaces. Continuous Diffuse Illumination
(CDI), also known as Cloudy Day Illumination, provides a hemisphere of
diffuse, uniform illumination. The complete lighting envelope has even
lighting from all directions. The use of a curved beam splitter completes
the horizon-to-horizon illumination. On-axis and off-axis lighting is
controlled separately to ensure that uniformity remains in balance. Refer
to Figure A–12.
Light
Source
Object
Camera
R
V
S
I
5
.
6
8
1
1
1
6
4 2
.
8
0
.
5
1
.
5
0
.
4
4
0
.
7