Contact Image Sensors (CIS) & CVB FlexInspect
A new approach to high-security print-inspection
Jan Friedrich
International Sales and Business Development Manager
STEMMER IMAGING
WHO ARE WE?
STEMMER IMAGING is:
Europe's leading independent provider of
Core vision technology / Components
Solutions
Services
Our mission:
To provide the users and developers of imaging
technology with competitive advantage by adding value
in the supply of quality components, expertise and
support.
2
OUR PRODUCTS
Illumination
Optics
Cameras
Cabling
Acquisition
Software
Systems
Accessories
3
Contact Image Sensors (CIS)
CONTACT IMAGE SENSOR
CIS - Contact Image Sensor for imaging of flat objects
CIS is a fully developed technology and established in various
applications, e.g. in scanners, copy machines, bank note scanners
CIS solution offers high resolution and excellent colour reproduction
Compact scanning unit
CONTACT IMAGE SENSOR
On-going improvements allow industrial solutions
Standard CameraLink interface
Integrated illumination
High colour fidelity
High resolution
Scanning speed
Compact design
CONTACT IMAGE SENSOR
CIS technology will step into new applications in the industry
High value print-inspection (Banknotes, Security Paper, OVDs)
High-end document
scanning
PCB inspection
Solder paste inspection
Packaging
Glass inspection
Wood sample scanning
TWO APPROACHES TO LINE SCAN
Modular concept with single components
Combination of line scan camera, lens and external line light
Scalable resolution and field of view
Significant working distance
Usable for flat and uneven objects
CIS unit as integrated package
Integrated unit: Sensor, lens and lighting in one
housing
Pixels are mapped 1:1 to the object with lens array
Small working distance
No lens effects (distortion)
Easy alignment
Only for flat objects because of low depth of focus
MITSUBISHI ELECTRIC CIS
Specification of the KD series
Scan width: 309 mm, 617 mm and 926 mm
Tri linear CMOS RGB Sensor
Integrated white LED illumination
Pixel Density: 600 dpi, 300 dpi, 150 dpi
Number of Pixels: 7k, 15k and 22k (24bit)
Max line rate: 44 us/line (22kHz, 920mm/s)
Interface: CameraLink Base or Medium
Focal Point: +12 mm from glass surface
+- 0,5 mm depth of focus
CIS CONFIGURATION
Key components
Integrated LED, high intensity and homogeneity
Selfoc lens array, 12 mm working distance
Sensor IC (Array)
High speed operation
Precise chip alignment
ASIC chip for image processing
Pixel correction, line alignment
Digital output over CameraLink interface
CIS Sensor
CIS LEDs
FRAME GRABBER ADAPTION
How to acquire and process high speed image data?
Example: CIS KD 926mm with 22k pixels (DIN A 0)
Data rate up to 1.5GB/s
3x CameraLink Medium frame grabbers required!
Our recommendations are:
Frame grabbers with on-​board FPGAs for real-time pre-processing
Silicon Software microEnable IV
Teledyne DALSA Xcelera VX4
Supported by Common Vision Blox
CVB FlexInspect
Pattern Verification for Variable
Products
INSPECTING VARIABLE PRODUCTS
Many products are challenging to verify due to their natural appearance variations…
Textiles
Warp & Natural Variation
Plastics
Thermal Warp
Screen Print
Layer alignment & quality
Flexible Electronics
Flexible warp
Watermarks
Variable quality and
appearance
FLEXIBLE HOLOGRAM EXAMPLE
Tough Inspection Task - Variable appearance changes
“GOLDEN TEMPLATE” DIFFERENCE: NOT USEFUL
Difference image shows large differences all the time
FLEX INSPECT - DETECTS DEFECTS
Model difference shows dark dirt spec and missing letter
PLASTIC CARD EXAMPLE
Card warps during process & colour changes
FLEX INSPECT EXAMPLE – PLASTIC CARDS
Warping results in false detections using a standard difference image
FLEX INSPECT EXAMPLE – PLASTIC CARDS
Flex Inspect Model Difference shows correctly shows no defects
CIS & CVB FLEX INSPECT
Combination of CIS and FlexInspect offers new approach to industrial
web-inspection and high security print inspection.
Thank you for
your attention!
STEMMER IMAGING GmbH
Gutenbergstraße 9 – 13
82178 Puchheim, Germany
Phone:
Fax:
+49 89 80902-0
+49 89 80902-116
[email protected]
www.stemmer-imaging.de