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Online Handwriting recognition is a procedureof a computer to detect and understand intelligible handwritten characters,words, sentence or paragraph input from a touch sensitive or pen sensitiveinput sources such as Pen tablets, PDA, touch-screens and other devices. Themovements of the pen tip may be sensed “on line”, but it iscomparatively difficult task to recognize with great accuracy because in caseof online handwriting only co-ordinate values are known to us. Handwritingrecognition principally entails optical character recognition. However, acomplete handwriting recognition system also handles pre-processing steps,formatting, performs correct segmentation into characters, normalization andfinds the most plausible Characters and words.

On-line handwriting recognitioninvolves the automatic conversion of text as it is written on a specialdigitizer or PDA, where a sensor picks up the pen-tip movements as well aspen-up/pen-down switching and covert into vectors or matrix form. This kind ofdata is known as digital ink and can be regarded as a digital representation ofhandwriting. The obtained signal is converted into letter codes which areusable within computer and text-processing applications.For online wordrecognition there are some preprocessing steps. One of themost importantpre-processing steps is dehooking as because without dehooking of a handwrittenstroke perfect recognition is not possible.

Only few workshas been done on dehookingof online handwritten characters and words. Here a new algorithm is proposedfor dehooking of online handwritten characters and words. This algorithm can beapplied for any Indian as well as foreign languages. Here we tested thealgorithm on Bengali handwritten characters and words.Restof the paper is organized as follows, Section we contains the introduction ofonline handwriting recognition, preprocessing steps of online handwritingrecognition and dehooking, Section II contain Bengali script and online datacollection, Section III contain the related work of dehooking process, SectionIV contain proposed methodology, Section V describes results and discussion,Section VI contain the concludes research work with future directions.


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