 INTRODUCTION  STEPS OF GESTURE RECOGNITION  TRACKING TECHNOLOGIES  SPEECH WITH GESTURE  APPLICATIONS

Gestures are expressive, meaningful body motions – i.e., physical movements of the fingers, hands, arms, head, face, or body with the intent to convey information or interact with the environment.

Mood and emotion are expressed by body language. Facial expressions. Tone of voice. Allows computers to interact with human beings in a more natural way. Allows control without having to touch the device.

Replace mouse and keyboard. Pointing gestures. Navigate in a virtual environment. Pick up and manipulate virtual objects. Interact with a 3D world. No physical contact with computer. Communicate at a distance.

1.DATAGLOVES / CYBERGLOVES - Use of gloves equipped with sensors. - Use of fiber optic cables.

5000 gestures in vocabulary. each gesture consists of a hand shape, a hand motion and a location in 3D space. AFC

Colour Segment Noise Removal Scale by Area THE PROCESS

2.COMPUTER-VISION TECHNOLOGY. USE OF CAMERAS -DEPTH CAMERAS. -STEREO CAMERAS. -NORMAL CAMERAS.

Here the index finger is recognized and when extended, becomes a drawing tool. Here, text is entered by pointing at the character desired Here the index fingers and thumbs of the two hands are recognized and are used to control the shape of the object being defined

ABC Y Yes/No?

We need to search thousands of images. How to do this efficiently? We need to use a “coarse-to-fine”search strategy.

Original image Blurring Factor = 1 Blurring Factor = 2 Blurring Factor = 3

Factor = 3.0 Factor = 2.0 Factor = 1.0

Hidden Markov Model ( HMM ) --- time sequence of images modeling HMM1 (Hello) HMM2 (Good) HMM3(Bad) HMM4 (House) P(f |HMM1) f P(f |HMM2)

Given previous frames we can predict what will happen next Speeds up search. occlusions -

In fluent dialogue signs are modified by preceding and following signs. intermediate forms A B

Single pose  Standard head-and-shoulders view with uniform background  Easy to find face within image

Alignment Faces in the training set must be aligned with each other to remove the effects of translation, scale, rotation etc. It is easy to find the position of the eyes and mouth and then shift and resize images so that are aligned with each other

Once the images have been aligned you can simply search for the member of the training set which is nearest to the test image. There are a number of measures of distance including Euclidean distance, and the cross- correlation.

PCA reduces the number of dimensions and so the memory requirement is much reduced. The search time is also reduced

The same person may sometimes appear differently due to Beards, moustaches Glasses, Makeup These have to be represented by different ellipsoids.

There are six types of facial expression We could use PCA on the eyes and mouth – so we could have eigeneyes and eigenmouths Anger Fear Disgust Happy Sad Surprise

Heads must now be aligned in 3D world space. Classes now form trajectories in feature space. It becomes difficult to recognise faces because the variation due to pose is greater than the variation between people.

We can fit a model directly to the face image Model consists of a mesh which is matched to facial features such as the eyes, nose, mouth and edges of the face. We use PCA to describe the parameters of the model rather than the pixels.

Voice and gesture compliment each other and form a powerful interface that either a modality alone. Speech and gesture make a more interactive interface. Combining gesture and voice increase recognition accuracy.

Within the media room user can use gesture,speech,eye movements or combination of all three. Example: One application allowed user to manage color coded ship against a map of a carribean. A user just need to point the location and need to say “create a large blue tank”. A blue tank will appear on the location. Media room

 Sign language recognition: gesture recognition software can transcribe the symbols represented through sign language into text.  Control through facial gestures: Controlling a computer through facial gestures is a useful application of gesture recognition for users who may not physically be able to use a mouse or keyboard.  Immersive game technology: Gestures can be used to control interactions within video games to try and make the game player's experience more interactive or immersive.

A person playing game. Computer is responding as per user instruction. A girl is instructing the computer from her body movements.

 Virtual controllers: For systems where the act of finding or acquiring a physical controller could require too much time, gestures can be used as an alternative control mechanism.  Affective computing: In affective computing, gesture recognition is used in the process of identifying emotional expression through computer systems.  Remote control: Through the use of gesture recognition, “remote control with the wave of a hand” of various devices is possible. The signal must not only indicate the desired response, but also which device to be controlled.

Occlusions (Atid). Grammars in Irish Sign Language. --- Sentence Recognition. Body Language.

 Wu yang,vision based gesture recognition lecture notes in artificial intelligence  Wikipedia.