Method for interpreting a plurality of response marks on a scannable surface
US5711673A · kind A · utility
30Cited by
9References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 24, 1995 |
| Grant date | Jan 27, 1998 |
| Priority date | — |
| Expiry date | Feb 24, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K17/0032
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
To determine a read level threshold for discriminating those response bubbles on a scannable answer sheet intended to be marked from those response bubbles not intended to be marked, an adjustable read level threshold is dynamically determined based on the read levels of a designated pool of response bubbles. Response bubble marks having a darkness read level at or above a threshold level are interpreted to be intended response marks, and different response bubbles in which response marks may be found are assigned different predetermined scoring values.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.