5 Conclusion
Filled optical answer sheet marks have personal traits,
which can be attributed to their filler. Further development
is required for using SVM on multiple mark measurements,
to rule out or determine filling by imposter with a high
level of confidence. One requirement for this is the use of a
standard pencil. An inherent difficulty is the fact that
answer sheet filling is a relatively seldom activity and
accordingly filling styles are not retained over time.