Facial recognition system and method
A facial identification system corrects lighting and pose in images prior to comparison with stored images. A three dimensional image is created from an original two dimensional image by combining the image with shape information. An iterative process is used to adjust the shape in order to match the original two dimensional image. A final image is rendered, with adjustments for lighting and pose, from the shape information.
1. A processor-implemented method of processing an image of a face, the method comprising:
receiving a two dimensional facial image, the facial image having been captured from a viewpoint;
combining the two dimensional facial image and a standard three dimensional facial image to create a modified three dimensional facial image;
adjusting an orientation of the modified three dimensional facial image with respect to said viewpoint; and
with respect to said viewpoint, rendering a two dimensional image from the adjusted three-dimensional facial image, wherein combining, adjusting and rendering are performed by a processor system and wherein combining includes:
performing a sequence of steps involving:
combining the two dimensional facial image and standard three dimensional facial image to create a first intermediate three dimensional facial image;
rendering a first intermediate two dimensional facial image based upon the first intermediate three dimensional facial image; and
comparing the first intermediate two dimensional facial image to the two dimensional facial image; and
after performing said sequence of steps, modifying the first intermediate three dimensional facial image based upon results from performing said sequence of steps.
2. The method of claim 1 , wherein the standard three dimensional facial image is generated by receiving a plurality of three dimensional facial images and combining the plurality of three dimensional facial images to generate the standard three dimensional facial image.
3. The method of claim 1 , wherein combining the two dimensional facial image and the standard three dimensional facial image to create a modified three dimensional facial image further includes performing the sequence of steps a plurality of times.
4. The method of claim 1 , further comprising:
rendering a final two dimensional image from the three dimensional facial image according to a selected lighting.
5. The method of claim 1 , further comprising:
comparing the rendered adjusted two dimensional facial image to at least one stored two dimensional facial image to determine a match.
6. A system for identifying an individual, said system comprising:
a camera for acquiring a two dimensional facial image of a person's head from a viewpoint relative to the person's head;
means for creating a three dimensional facial image from the two dimensional facial image;
means for adjusting an orientation of the three dimensional facial image with respect to said viewpoint;
means for rendering with respect to said viewpoint a final two dimensional image from the adjusted three dimensional image; and
means for comparing the final two dimensional image to at least one stored two dimensional image to determine a match, wherein the means for creating a three dimensional facial image includes:
means for combining the two dimensional facial image with a standard three dimensional facial image to create an intermediate three dimensional facial image; and
means for rendering an intermediate two dimensional facial image from the intermediate three dimensional facial image;
means for comparing the intermediate two dimensional facial image to the two dimensional facial image; and
means for adjusting the intermediate three dimensional facial image based upon results of the comparison of the intermediate two dimensional facial image to the two dimensional facial image.
7. The system for identifying an individual according to claim 6 , further comprising:
a database of stored two dimensional images; and
wherein the means for comparing includes means for comparing the final two dimensional image to at least one stored two dimensional image in the database of stored two dimensional images.
8. The system for identifying an individual according to claim 7 , wherein the means for comparing includes means for comparing the final two dimensional image to a plurality of stored two dimensional images in the database to determine a closest match.
9. The system for identifying an individual according to claim 6 , wherein the means for rendering includes means for rendering the final two dimensional facial image based upon a selected lighting.