Method of recognizing faces using range images
First Claim
Patent Images
1. A method of comparing a three-dimensional facial image with a two-dimensional intensity image of a face comprising the steps of:
- providing a filter having three orthogonal components derived from a plurality of normal vectors derived from points defining the surface of the three-dimensional facial image;
performing a correlation by the steps of providing a transform of at least one of the two-dimensional intensity image other than a transform of the intensity image into a three-dimensional image and filtering the provided transform using the filter derived from three-dimensional facial image to obtain correlation results which are partially independent of the angle from which a face within the two-dimensional intensity image is illuminated; and
,when the correlation results are within a first range, providing a signal indicative of a match.
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Abstract
Faces are one of the most commonly recognized features among people. According to the invention a system for recognizing intensity images of faces is provided. Intensity images of a face are captured and normalized. The intensity images are transformed, filtered and then transformed again. The filter is based on a three-dimensional image of a face against which the intensity image is being compared. The result is a form of correlation that is substantially illumination independent.
91 Citations
21 Claims
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1. A method of comparing a three-dimensional facial image with a two-dimensional intensity image of a face comprising the steps of:
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providing a filter having three orthogonal components derived from a plurality of normal vectors derived from points defining the surface of the three-dimensional facial image; performing a correlation by the steps of providing a transform of at least one of the two-dimensional intensity image other than a transform of the intensity image into a three-dimensional image and filtering the provided transform using the filter derived from three-dimensional facial image to obtain correlation results which are partially independent of the angle from which a face within the two-dimensional intensity image is illuminated; and
,when the correlation results are within a first range, providing a signal indicative of a match. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for performing facial recognition comprising:
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means for providing a two-dimensional intensity image of a face; means for transforming the intensity image in a predetermined fashion other than a transform of the intensity image into a three-dimensional image; means for filtering the transformed intensity image with a filter having three orthogonal components derived from a plurality of normal vectors derived from points defining the surface of a face within a known three-dimensional image for producing a filtered transform image that is substantially independent of an angle of illumination of a face within the two-dimensional intensity image; means for transforming the filtered transformed intensity image to produce a result indicative of a correlation between he provided intensity image of a face and the known three-dimensional image. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of comparing a three-dimensional facial image with a two-dimensional intensity image of a face comprising the steps of:
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providing information derived from the three-dimensional facial image; extracting three orthogonal images from the three-dimensional image, the orthogonal images based on orthogonal components of vectors normal to the surface of the three-dimensional image; performing a correlation of a transform of the two-dimensional intensity image and extracted orthogonal images to obtain correlation results which are partially independent of the angle from which a face within the two-dimensional intensity image is illuminated; and
,when the correlation results are within a first range, providing a signal indicative of a match. - View Dependent Claims (21)
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Specification