A Restoration Method for Broken Handwritten Line-figures with Connecting Terminal Points
Kazuki Nakashima, Masashi Koga, Katsurni Marukawa, Yoshihiro Shima · 1996
In some pattern recognition processes bmed on recognizing structural features, a serious problem is poorly-cbawn lines which cause broken parts when a digital bitmap (a binary image) is madeof the line-jgure. This broken pattern changes the pattern structure, and increases the likelihood of rejection or misreading during the recognition process. Therefore, we have developed a restoration method for broken handwritten line-figures. In the restoration, broken parts areselected and connected smoothly. In an experiment using handwritten numerals, about 70 % of the patterns that were restored were recognized correctly. also a not-broken-part in the upper right, as shown in Fig. 2(b). Figure 2(b) shows that an extra hole is formed at the top of the pattern, and as a result, the structure of the pattern differs from the standard pattern in the recognition dictionary. Therefore, in structural analysis recognition, changing the pattern structure can seriously dce the probability of recognition. To solve this problem, a restoration method that can be focused on selected broken-parts is needed. This paper proposes a restoration method where only the broken part is selected by using the direction and length of the broken part. The effectiveness of this method when applied to a handwritten line-figure is demonstrated. 1. Introduction 2. Detailed