Transcript PPT

UNSD Census Workshop
Day 2 - Session 6
Data Capture: Optical Mark Recognition
Andy Tye – International Manager
DRS are Worldwide specialists in data capture from paper
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
Data Capture - OMR
OMR from Image
Forms Design
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Typical stock grade
paper (90GSM)
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Corner Stones
advised
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Dropout colour is
recommended but
not essential
Data Capture - OMR
Dedicated OMR
Scanners
Forms Design
•
CBS2 Standard
Paper
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Layout of form
designed using
grid system
•
Dropout colour is
mandatory
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
Data Capture - OMR
OMR from Image
Hardware
•
Image Scanners
–
TWAIN or ISIS
•
•
Database Server
Storage Server
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Network
•
•
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•
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Administrator PC
CS-Pro PC’s
Key correction PC’s
Scanner PC’s
Image interpretation PC’s
Data Capture - OMR
OMR from Image
Dedicated OMR Scanners
Hardware
Hardware
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•
OMR Scanners
Image Scanners
–
TWAIN or ISIS
•
•
Database Server
Storage Server
•
Database Server
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Network
•
Network
•
•
•
•
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Administrator PC
CS-Pro PC’s
Key correction PC’s
Scanner PC’s
Image interpretation PC’s
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•
Administrator PC
CS-Pro PC’s
Data Capture - OMR
Typical Workflow
Dedicated OMR Scanners
Data Capture - OMR
Typical Workflow
Dedicated OMR Scanners
OMR from Image
Data Capture - OMR
OMR from Image
Software
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Software for Scanner PC’s
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•
•
•
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Software for Administrator PC
CS-Pro PC’s
Software for Key correction PC’s
Software for Direct Data Entry PC’s
License per Image interpretation PC’s
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•
MS -SQL or other database
Data Storage, archive and Retrieval
Data Capture - OMR
OMR from Image
Dedicated OMR Scanners
Software
Software
•
Software for Scanner PC’s
•
Software for OMR Scanners
•
•
•
•
•
Software for Administrator PC
CS-Pro PC’s
Software for Key correction PC’s
Software for Direct Data Entry PC’s
License per Image interpretation PC’s
•
•
Software for Administrator PC
CS-Pro PC’s
•
•
MS -SQL or other database
Data Storage, archive and Retrieval
•
MS -SQL or other database
Data Capture - OMR
OMR from Image
Accuracy
•
Typically tolerance level applied
Data Capture - OMR
OMR from Image
Dedicated OMR Scanners
Accuracy
Accuracy
•
•
Typically tolerance level applied
Typically 16 levels of discrimination
Data Capture - OMR
OMR from Image
Advantages
•
No Specialist hardware required
•
An Image archive is automatically
produced of every form
•
Very high speed scanning can be
achieved
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 ‘outsorted’
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Validated data is produced
immediately as forms are accepted
•
Overall a low cost option for paper
based data capture
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Data Capture - OMR
OMR from Image
Disadvantages
•
Not all data can be collected using
OMR. Such as name, occupation, etc.
•
Need trained enumerators to complete
the form.
•
As OMR fields take up space, so
forms can be more pages as a
consequence
•
Accuracy suffers from image
technology
•
Significant Hardware/software and
trained IT staff will be required
•
Accuracy dependant on manual
intervention
Data Capture - OMR
OMR from Image
Dedicated OMR Scanners
Disadvantages
Disadvantages
•
Not all data can be collected using
OMR. Such as name, occupation, etc.
•
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
Data Capture - OMR
Cost Comparatives (A general guide)
OMR from image
Forms Design
Dedicated OMR Scanner
Same
Forms Production
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Up to 50% More
Enumerator Training
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Up to double the cost
Scanners
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Up to double the cost
PC
Up to 3 times the cost
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PC Operators
Up to double the cost
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Servers
Up to double the cost
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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’
Worldwide specialists in data capture from paper