抄録
In signature verification and/or character recognition problems, matching of two drawings has a certain significance [3]. For these problems, online equipments such as a tablet and an electronic pen are simultaneously used. In an environment where online equipment can be used, using these is more efficient than simply using a pen and a sheet of paper. The latter is called “offiine method”. Two advantages of using online equipments arise from here. One is that the analyser is free from the heavy computational load of image processing which is inherent to offline methods. Thus the analysis can also be “online” without waiting the availability of the whole signature. The other is that the analyser can use various information of writing which is usually unavailable in offiine method. An example can be shown in the signature verification. If the holder of the signature intentionally writes a part of the signature in a strange direction, others are not likely to be able to imitate it. Another simple technique for making the signature not likely to be imitated by other persons is, say, to put a dot in the right end and begin the signature from the left end. The drawings appearing on the screen does not explicitly show the secret on the screen, but the analyser or a computer can obviously detect this secret and is likely to find the forgery whose writer has not noticed the secret of the true signature. Thus we can believe that the online matching is especially useful in signature verification problems. It is clearly necessary to detect the difference between the genuine and fake ones written in a standard way of signing. This paper gives an analysis of a method proposed for this purpose.
