Separating directional lighting variability in statistical face modelling based on texture space decomposition
First Claim
1. A face illumination normalization method, comprising:
- (a) acquiring a digital image including data corresponding to a face that appears to be illuminated unevenly;
(b) applying separate sets of directional and uniform illumination classifier programs to the face data;
(c) identifying the face data as corresponding to a projection of said face within the digital image on one or a combination of the directional illumination classifier programs plus a constant vector representing said face according to one or a combination of the uniform illumination classifier programs, thereby decomposing the face data into orthogonal subspaces for directional and uniform illumination;
(d) normalizing an illumination condition for the face including setting one or more illumination parameters of the directional illumination projection to zero;
(e) electronically storing, transmitting, applying a face recognition program to, editing, or displaying the corrected face image, or combinations thereof.
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Accused Products
Abstract
A technique for determining a characteristic of a face or certain other object within a scene captured in a digital image including acquiring an image and applying a linear texture model that is constructed based on a training data set and that includes a class of objects including a first subset of model components that exhibit a dependency on directional lighting variations and a second subset of model components which are independent of directional lighting variations. A fit of the model to the face or certain other object is obtained including adjusting one or more individual values of one or more of the model components of the linear texture model. Based on the obtained fit of the model to the face or certain other object in the scene, a characteristic of the face or certain other object is determined.
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Citations
18 Claims
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1. A face illumination normalization method, comprising:
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(a) acquiring a digital image including data corresponding to a face that appears to be illuminated unevenly; (b) applying separate sets of directional and uniform illumination classifier programs to the face data; (c) identifying the face data as corresponding to a projection of said face within the digital image on one or a combination of the directional illumination classifier programs plus a constant vector representing said face according to one or a combination of the uniform illumination classifier programs, thereby decomposing the face data into orthogonal subspaces for directional and uniform illumination; (d) normalizing an illumination condition for the face including setting one or more illumination parameters of the directional illumination projection to zero; (e) electronically storing, transmitting, applying a face recognition program to, editing, or displaying the corrected face image, or combinations thereof. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A non-transitory digital memory having stored therein processor-readable code for programming a processor to perform a face illumination normalization method, wherein the method comprises:
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(a) acquiring a digital image including data corresponding to a face that appears to be illuminated unevenly; (b) applying separate sets of directional and uniform illumination classifier programs to the face data; (c) identifying the face data as corresponding to a projection of said face within the digital image on one or a combination of the directional illumination classifier programs plus a constant vector representing said face according to one or a combination of the uniform illumination classifier programs, thereby decomposing the face data into orthogonal subspaces for directional and uniform illumination; (d) normalizing an illumination condition for the face including setting one or more illumination parameters of the directional illumination projection to zero; (e) electronically storing, transmitting, applying a face recognition program to, editing, or displaying the corrected face image, or combinations thereof. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A digital image acquisition device including an optoelectronic system for acquiring a digital image, and a digital memory having stored therein processor-readable code for programming the processor to perform a face illumination normalization method, wherein the method comprises:
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(a) acquiring a digital image including data corresponding to a face that appears to be illuminated unevenly; (b) applying separate sets of directional and uniform illumination classifier programs to the face data; (c) identifying the face data as corresponding to a projection of said face within the digital image on one or a combination of the directional illumination classifier programs plus a constant vector representing said face according to one or a combination of the uniform illumination classifier programs, thereby decomposing the face data into orthogonal subspaces for directional and uniform illumination; (d) normalizing an illumination condition for the face including setting one or more illumination parameters of the directional illumination projection to zero; (e) electronically storing, transmitting, applying a face recognition program to, editing, or displaying the corrected face image, or combinations thereof. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification