Standard sign languages (SL) are known as Deaf and Dumb languages. SLs are gestural languages which contain symbolic encoded message for communication without speech channel. They are unique in some ways in that they cannot be written like spoken language. Sign language varies from country to country with its own vocabulary and grammar. Even within one country, sign language can vary from region to region like spoken languages. Indian Sign Language (ISL) is a language used by Indian deaf and dumb community.
Gestures are powerful means of communication among humans. Among different modality of body, hand gesture is the most simple and natural way of communication mode. Real time, vision based hand gesture recognition is more feasible due to the latest advances in the field of computer vision, image processing and pattern recognition but it has yet, to be fully explored for Human Computer Interaction (HCI).
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