Face recognition procedure useful for audiovisual speech recognition
First Claim
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1. A visual feature extraction method comprising segmenting a mouth region from the detected face, finding the contour of the lips, and widowing the mouth region to emphasize the region inside the lip contour, applying the two dimensional discrete cosine transform on blocks within the mouth region, applying multiclass linear discriminant analysis to the windowed mouth region.
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Abstract
A visual feature extraction method includes application of multiclass linear discriminant analysis to the mouth region. Lip position can be accurately determined and used in conjunction with synchronous or asynchronous audio data to enhance speech recognition probabilities.
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24 Claims
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1. A visual feature extraction method comprising
segmenting a mouth region from the detected face, finding the contour of the lips, and widowing the mouth region to emphasize the region inside the lip contour, applying the two dimensional discrete cosine transform on blocks within the mouth region, applying multiclass linear discriminant analysis to the windowed mouth region.
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11. An article comprising a computer readable medium to store computer executable instructions, the instructions defined to cause a computer to
detect a face in video data, segment a mouth region in the detected face, apply multiclass linear discriminant analysis to the mouth region.
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21. A speech recognition system comprising
an audiovisual capture module to respectively provide a first data stream of speech data and a second data stream of video data, a visual feature extraction module that detects a face in the second data stream of video data, discriminates a mouth region in the detected face, and applies multiclass linear discriminant analysis to the mouth region, and a speech recognition module that applies a two stream coupled hidden Markov model to the first data stream of speech data and the second video data stream processed by the visual feature extraction module.
Specification