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16th International Conference on Pattern Recognition (ICPR'02) - Volume 3
Pen Pressure Features for Writer-Independent On-Line Handwriting Recognition Based on Substroke HMM
Quebec City, QC, Canada
August 11-August 15
ISBN: 0-7695-1695-X
Mitsuru Nakai, Japan Advanced Institute of Science and Technology
Takashi Sudo, Japan Advanced Institute of Science and Technology
Hiroshi Shimodaira, Japan Advanced Institute of Science and Technology
Shigeki Sagayama, University of Tokyo
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.
Citation:
Mitsuru Nakai, Takashi Sudo, Hiroshi Shimodaira, Shigeki Sagayama, "Pen Pressure Features for Writer-Independent On-Line Handwriting Recognition Based on Substroke HMM," icpr, vol. 3, pp.30220, 16th International Conference on Pattern Recognition (ICPR'02) - Volume 3, 2002
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