Direction-change features of imaginary strokes for on-linehandwriting character recognition

摘要

We found suitable direction-change features of the imaginarystrokes in the pen-up state for online handwritten cursive characterrecognition. Our method simultaneously uses both directional features,otherwise known as off-line features, and direction-change features,which we designed as on-line features. Direction-change features expressboth written strokes in the pen-down state and unwritten imaginarystrokes in the pen-up state. It is important to get suitabledirection-change features when using this method. We tried to examinethe influence on character recognition rates when changing the functionsused to get each direction-change feature based on the imaginary strokelengths. Then, we found that the best function is the function whichputs no weight on the imaginary stroke lengths. The recognition rate forfreely-written Japanese characters was improved from 82.37% to 86.32% byour new method using the best function as opposed to our old methodusing a function which gets each direction change feature in inverseproportion to the imaginary stroke lengths