Compression of Digital-Ink with Pen Slip Using Optimal <i>L</i>₁ Smoothing Splines

Abstract

This paper considers a problem on data compression of "Digital-Ink" which is a sequence of data sampled from the traced curve at a sampling rate.In particular, considering the case when there are some slips of pen during the handwriting input due to a frictionless sheet on the display, etc., we develop a robust method of digital-ink compression by employing optimal smoothing spline method based on B-splines. It is shown that L 1 smoothing spline can be used effectively for excluding the influence due to the pen slips. The performance is examined by some experimental studies.