unsd census workshop day 2 - session 6 data capture: optical mark recognition andy tye –...
TRANSCRIPT
UNSD Census WorkshopDay 2 - Session 6
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
• OMR from image
DRS are Worldwide specialists in Census data capture www.drs.co.uk
Data Capture
Image Storage
ScanDatabase
Processing
• Dedicated OMR Scanners
DRS are Worldwide specialists in Census data capture www.drs.co.uk
Scan
Data Capture
Database
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
OMR from image
Hardware
• Image Scanners– TWAIN or ISIS
• Database Server• Storage Server
• Network
• Administrator PC• CS-Pro PCs• Key correction PCs• Scanner PCs• Image interpretation PCs
Dedicated OMR Scanners
Hardware
• OMR Scanners
• Database Server
• Network
• Administrator PC• CS-Pro PCs
Data Capture - OMR
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
DRS are Worldwide specialists in Census data capture www.drs.co.uk
Dedicated OMR Scanners
OMR from image
Software
• Software for Scanner PCs
• Software for Administrator PC• CS-Pro PCs• Software for Key correction PCs• Software for Direct Data Entry PCs• License per Image interpretation
PCs
• MS-SQL or other database• Data Storage, Archive and Retrieval
Dedicated OMR Scanners
Software
• Software for OMR Scanners
• Software for Administrator PC
• CS-Pro PCs
• MS -SQL or other database
Data Capture - OMR
DRS are Worldwide specialists in Census data capture www.drs.co.uk
Data Capture - OMR
OMR from image
Accuracy
• Typically tolerance level applied
Dedicated OMR Scanners
Accuracy
• Typically 16 levels of discrimination
DRS are Worldwide specialists in Census data capture www.drs.co.uk
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
Dedicated OMR Scanners
Advantages
• Very accurate time proven technology
• A guaranteed accuracy of data from properly shaded forms
• ‘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
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
Dedicated OMR Scanners
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
• Accurately printed forms are required.
DRS are Worldwide specialists in Census data capture www.drs.co.uk
Data Capture - OMR
Cost Comparisons (A general guide)
OMR from Image Dedicated OMR Scanner
Forms Design 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 WorkshopDay 2 - Session 6
Thank you for listening
Andy Tye – International Manager
DRS are Worldwide specialists in Census data capture www.drs.co.uk