Method and apparatus of recognizing face using component-based 2nd-order principal component analysis (PCA)/independent component analysis (ICA)
First Claim
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1. A method of recognizing a face using component-based independent component analysis (ICA)/principal component analysis (PCA), the method comprising the steps of:
- (a) segmenting a predetermined input facial image by facial components and generating segmented images;
(b) performing PCA on the segmented images to generate low-pass filtered images;
(c) calculating a difference between the low-pass filtered images and the segmented images to obtain residual images; and
(d) performing ICA on the residual images and generating first feature information corresponding to the segmented images, and generating pieces of second feature information as a set of the pieces of the first feature information.
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Abstract
A method and apparatus for recognizing and searching for a face using 2nd-order independent component analysis (ICA) are provided. The method for describing feature points uses 2nd-order ICA d to describe a facial image space and improve recognition performance in various illumination conditions. According to the method and apparatus, use of pose or illumination invariant face descriptor enables retrieval of human faces and authentication of a specific individual.
134 Citations
20 Claims
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1. A method of recognizing a face using component-based independent component analysis (ICA)/principal component analysis (PCA), the method comprising the steps of:
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(a) segmenting a predetermined input facial image by facial components and generating segmented images; (b) performing PCA on the segmented images to generate low-pass filtered images; (c) calculating a difference between the low-pass filtered images and the segmented images to obtain residual images; and (d) performing ICA on the residual images and generating first feature information corresponding to the segmented images, and generating pieces of second feature information as a set of the pieces of the first feature information. - View Dependent Claims (2)
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3. A method of recognizing a face using component-based principal component analysis (PCA)/independent component analysis (ICA), the method comprising the steps of:
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(a) receiving a first facial image to be recognized and a second facial image to be used as a basis for comparison with the first facial image; (b) performing component-based PCA/ICA on the first and second facial images, respectively, and extracting pieces of second feature information corresponding to the first and second facial images, wherein the performing component-based PCA/ICA includes performing PCA on the first and second facial images, obtaining residual images by calculating a difference between images generated by the PCA and the first and second facial images, and performing ICA on the residual images; and (c) determining whether there is a similarity between the pieces of the second feature information corresponding to the first and second facial images, and outputting the determination result. - View Dependent Claims (4, 5, 6, 7)
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8. A method of searching for a face using component-based principal component analysis (PCA)/independent component analysis (ICA), the method comprising:
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(a) constructing a database (DB) in which facial images of one or more persons and identification information of the persons are stored; (b) receiving a facial image to be searched for from the DB; (c) performing the component-based PCA/ICA on the facial image to be searched for and generating second feature information, wherein the performing component-based PCA/ICA includes performing PCA on the facial image to be searched for, obtaining a residual image by calculating a difference between an image generated by the PCA and the facial image to be searched for, and performing ICA on the residual image; (d) sequentially reading facial images stored in the DB, and performing the component-based PCA/ICA on the read facial images and generating second feature information; (e) comparing the second feature information corresponding to a facial image read from the DB with the second feature information corresponding to the facial image to be searched for, and determining whether the two facial images identify a same person; and (f) reading identification information corresponding to the facial image from the DB and outputting the identification information if it is determined that the facial images identify the same person. - View Dependent Claims (9, 10, 11, 12)
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13. A method of searching for a face using component-based principal component analysis (PCA)/independent component analysis (ICA), the method comprising:
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(a) constructing a database (DB) in which facial images of one or more persons and identification information of the persons are stored; (b) receiving a facial image to be searched for from the DB; (c) performing the component-based PCA/ICA on the facial image to be searched for and generating second feature information, wherein the performing component-based PCA/ICA includes performing PCA on the facial image to be searched for, obtaining a residual image by calculating a difference between an image generated by the PCA and the facial image to be searched for, and performing ICA on the residual image; and (d) detecting second feature information similar to the second feature information corresponding to the facial image to be searched for from the DB and outputting the detected second feature information. - View Dependent Claims (14)
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15. An apparatus for generating feature information using component-based principal component analysis (PCA)/independent component analysis (ICA), the apparatus comprising:
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an image segmenting portion which segments a predetermined input original facial image by facial components included in the input original facial image and generates segmented facial images; a low-pass filtered image generator which performs PCA on the segmented facial images to generate low-pass filtered images by removing high-frequency components from the input image; a residual image generator which calculates a difference between the low-pass filtered images and the segmented images to generate residual images; and an ICA coefficient matrix calculator which performs ICA on the residual images and generates pieces of first feature information corresponding to the segmented images, and generates pieces of second feature information as a set of the pieces of first feature information.
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16. An apparatus for extracting a face using component-based principal component analysis (PCA)/independent component analysis (ICA), the apparatus comprising:
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an input portion which receives a first facial image to be recognized and a second facial image to be used as a basis for comparison with the first facial image; a feature information generator which performs component-based PCA/ICA on the first and second facial images and generates pieces of second feature information as a set of ICA coefficient matrices corresponding to facial components, wherein the feature information generator performs PCA on the first and second facial images, obtains residual images by calculating a difference between images generated by the PCA and the first and second facial images, and performs ICA on the residual images; and a comparator which compares a piece of second feature information corresponding to the first facial image to a piece of second feature information corresponding to the second facial image to determine whether there is a similarity therebetween, and outputs the determination result. - View Dependent Claims (17)
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18. An apparatus for searching for a face using component-based principal component analysis (PCA)/independent component analysis (ICA), the apparatus comprising:
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an input portion which receives facial images used in constructing a facial image information database (DB) and a facial image to be searched for that is included in the DB; a feature information generator which receives facial images from the input portion, performs the component-based PCA/ICA on the facial images and generates pieces of second feature information corresponding to the facial images, wherein the feature information generator performs PCA on the facial images, obtains residual images by calculating a difference between images generated by the PCA and the facial images, and performs ICA on the residual images; a DB managing portion which stores the second feature information corresponding to the facial images used in constructing the DB and supplied from the feature information generator, and manages the information to be stored in the DB; and a comparator which receives the second feature information corresponding to the facial image to be searched for from the feature information generator, searches for second feature information similar to the received second feature information, and determines whether the facial images identify a same person by comparing a degree of similarity to a predetermined reference value. - View Dependent Claims (19, 20)
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Specification