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Pattern Recognition, International Conference on (2002)
Quebec City, QC, Canada
Aug. 11, 2002 to Aug. 15, 2002
ISSN: 1051-4651
ISBN: 0-7695-1695-X
pp: 30220
Shigeki Sagayama , University of Tokyo
Takashi Sudo , Japan Advanced Institute of Science and Technology
Mitsuru Nakai , Japan Advanced Institute of Science and Technology
Hiroshi Shimodaira , Japan Advanced Institute of Science and Technology
This paper discusses the use of pen pressure as a feature in writer-independent on-line handwriting recognition. We propose two kinds of features related to pen pressure: one is the pressure representing pen ups and downs in a continuous manner; the other is the time-derivative of the pressure representing the temporal pattern of the pen pressure. Combining either of them with the existing feature (velocity vector), a 3-dimensional feature is composed for character recognition. Some techniques of interpolating the pen pressure during the pen-up interval is also proposed for a pre-processing purpose. Through experimental evaluation using 1,016 elementary Kanji characters compared with the baseline performance using velocity vector only, the additional use of pen pressure improved the performance from 97.5% to 98.1% for careful writings and from 91.1% to 93.1% for cursive writings.
Shigeki Sagayama, Takashi Sudo, Mitsuru Nakai, Hiroshi Shimodaira, "Pen Pressure Features for Writer-Independent On-Line Handwriting Recognition Based on Substroke HMM", Pattern Recognition, International Conference on, vol. 03, no. , pp. 30220, 2002, doi:10.1109/ICPR.2002.1047834
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