On the application of text input metrics to handwritten text input

There are several other methods for entering text at a computer, these include gaze typing and spoken input and, with the advent of the PDA and, more recently, the tablet PC, users can use handwritten text that is created with a stylus or pen. This handwritten text can be close to the users ‘natural’ handwriting, for example, cursive writing, or can require the user to construct letters in a constrained way (as found in the unistroke gestures such as those incorporated in Graffiti) [1], [2].