Method for locating a subject's lips in a facial image
First Claim
Patent Images
1. 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.
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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.
180 Citations
6 Claims
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1. A method for locating a subject'"'"'s lips in a image, comprising the steps of:
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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. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification