Transcript PPT

UNSD Census Workshop
Day 2 - Session 7
Data Capture: Optical Mark Recognition
Andy Tye – International Manager
DRS are Worldwide specialists in Census data capture
www.drs.co.uk
Data Capture
Optical Mark Recognition (OMR)
2 methods to automate Mark data capture
– OMR from image
– Dedicated OMR scanners
Forms design, Hardware, Software, Advantages,
Disadvantages for each method are different
DRS are Worldwide specialists in Census data capture
www.drs.co.uk
Data Capture
• OMR from image
Scan
Database
Image Storage
Processing
DRS are Worldwide specialists in Census data capture
www.drs.co.uk
Data Capture
• Dedicated OMR Scanners
Database
Scan
DRS are Worldwide specialists in Census data capture
www.drs.co.uk
Data Capture - OMR
OMR from image
Forms Design
• Typical stock grade
paper (90GSM)
• Corner Stones
advised
• Dropout colour is
recommended
but not essential
DRS are Worldwide specialists in Census data capture
www.drs.co.uk
Data Capture - OMR
Dedicated OMR
Scanners
Forms Design
• CBS2 Standard
Paper
• Layout of form
designed using grid
system
• Dropout colour is
mandatory
DRS are Worldwide specialists in Census data capture
www.drs.co.uk
Data Capture - OMR
Forms Design
Whichever OMR method chosen make sure you:
• Design your form in collaboration with technology
provider
• Finalise the form design in good time, well in advance
of census
• Prove your forms design with a Pilot exercise
Census forms need to be designed precisely and with
enumerator task in mind
DRS are Worldwide specialists in Census data capture
www.drs.co.uk
Data Capture - OMR
OMR from image
Dedicated OMR Scanners
Hardware
Hardware
•
Image Scanners
– TWAIN or ISIS
•
OMR Scanners
•
•
Database Server
Storage Server
•
Database Server
•
Network
•
Network
•
•
•
•
•
Administrator PC
CS-Pro PCs
Key correction PCs
Scanner PCs
Image interpretation PCs
•
•
Administrator PC
CS-Pro PCs
DRS are Worldwide specialists in Census data capture
www.drs.co.uk
Data Capture - OMR
Typical Workflow
OMR from image
DRS are Worldwide specialists in Census data capture
www.drs.co.uk
Data Capture - OMR
Typical Workflow
OMR from image
Dedicated OMR Scanners
DRS are Worldwide specialists in Census data capture
www.drs.co.uk
Data Capture - OMR
OMR from image
Dedicated OMR Scanners
Software
Software
•
Software for Scanner PCs
•
Software for OMR Scanners
•
•
•
•
•
Software for Administrator PC
CS-Pro PCs
Software for Key correction PCs
Software for Direct Data Entry PCs
License per Image interpretation
PCs
•
•
Software for Administrator PC
CS-Pro PCs
•
•
MS-SQL or other database
Data Storage, Archive and Retrieval
•
MS -SQL or other database
DRS are Worldwide specialists in Census data capture
www.drs.co.uk
Data Capture - OMR
OMR from image
Dedicated OMR Scanners
Accuracy
Accuracy
• Typically tolerance level applied
• Typically 16 levels of discrimination
DRS are Worldwide specialists in Census data capture
www.drs.co.uk
Data Capture - OMR
OMR from image
Dedicated OMR Scanners
Advantages
Advantages
•
No specialist hardware required
•
Very accurate time proven technology
•
An Image archive is automatically
produced of every form
•
A guaranteed accuracy of data from
properly shaded forms
•
Very high speed scanning can be
achieved
•
‘Problem’ forms are identified at point
of scanning and can be ‘out-sorted’
•
Validated data is produced immediately
as forms are accepted
•
Overall a low cost option for paper
based data capture
DRS are Worldwide specialists in Census data capture
www.drs.co.uk
Data Capture - OMR
OMR from image
Dedicated OMR Scanners
Disadvantages
Disadvantages
•
Not all data can be collected using
•
OMR. Such as name, occupation, etc.
•
Need trained enumerators to
complete the form.
•
Need trained enumerators to
complete the form.
•
As OMR fields take up space, so
forms can be more pages as a
consequence
•
As OMR fields take up space, so
forms can be more pages as a
consequence
•
Accuracy suffers from image
technology
•
Accurately printed forms are required.
•
Significant hardware/software and
trained IT staff will be required
•
Accuracy dependant on manual
intervention
Not all data can be collected using
OMR. Such as name, occupation, etc.
DRS are Worldwide specialists in Census data capture
www.drs.co.uk
Data Capture - OMR
Cost Comparisons (A general guide)
OMR from Image
Forms Design
Dedicated OMR Scanner
Same
Forms Production
-
Higher
Enumerator
Training
-
Higher
Scanners
-
Higher
PC
Higher
-
PC Operators
Higher
-
Servers
Higher
-
DRS are Worldwide specialists in Census data capture
www.drs.co.uk
Data Capture - OMR
Summary
For both methods
The single most important factor for timely and
accurate data capture is to make sure
‘the forms are filled in correctly and
are returned in good condition’
DRS are Worldwide specialists in Census data capture
www.drs.co.uk
UNSD Census Workshop
Day 2 - Session 7
Thank you for listening
Andy Tye – International Manager
DRS are Worldwide specialists in Census data capture
www.drs.co.uk