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US 5,805,745 AGranted
Method for locating a subject's lips in a facial image
AssigneeLucent Technologies Inc.
InventorHans Peter Graf
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Abstract
An embodiment of the present invention locates facial features in an image by bandpass filtering the image and then performing morphological operations followed by a thresholding operation. This initial processing identifies candidate areas where facial features may be located. The candidate areas are evaluated by classifiers to determine if a facial feature, such as an eye or mouth, has been located.
Claims6
A method for locating a subject's lips in a image, comprising the steps of:
- bandpass filtering the image to produce a bandpass filtered image;
- morphologically processing the bandpass filtered image to produce an enhanced image by convolving the bandpass filtered image with a rectangular shape;
- thresholding the enhanced image to form a binary image having a plurality of connected components;
- and
- using a classifier to identify at least one connected component corresponding to the subject's mouth;
- determining an intensity profile along a vertical strip across the image of the subject's mouth;
- determining an intensity variation of the intensity profile;
- and
- comparing the intensity profile to a plurality of stored intensity profiles to locate an edge of at least one of the lips if the intensity variation is below a first threshold, and comparing the intensity profile to a second threshold to locate the edge of at least one of the lips if the intensity variation is above the first threshold.
6 more elements
Dependencies are inferred from the claim text.