Method and apparatus for generating data representative of features of an image
First Claim
Patent Images
1. A method for generating data representative of characteristics of an image comprising:
- (a) inputting a plurality of face images;
(b) transforming each of the face images into a two-dimensional discrete cosine transform (DCT) to obtain DCT coefficients, wherein each of the DCT coefficients includes DCT amplitude and DCT sign;
(c) determining a plurality of average DCT amplitudes by averaging DCT amplitudes corresponding to each position of the DCT coefficients;
(d) identifying average DCT amplitudes having at least a predetermined value and positions corresponding to the identified average DCT amplitudes;
(e) storing positional information corresponding to the identified average DCT amplitudes;
(f) inputting a first face image at an image input part;
(g) transforming the first face image into a two-dimensional DCT at a DCT conversion part to obtain DCT coefficients, wherein each of the DCT coefficients includes DCT amplitude and DCT sign;
(h) extracting the DCT signs from the DCT coefficients for the first image based on the stored positional information; and
(i) generating a one-dimensional binary signal representation of the first face image based on the extracted DCT signs.
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Abstract
Image data representative of features of a respective plurality images are transformed using a two dimension discrete cosine transform (DCT), and the DCT sign coefficients of the respective DCT transforms for the images are selectively used to generate a highly compressed and secure one-dimension binary data representation of a subject image whose image data has undergone a DCT transform. The binary data representation can be, for example, of a face image and is readily applicable to a passport, a credit card, a driver'"'"'s license, an ID card, and the like, for use in rapid, secure face authentication.
22 Citations
5 Claims
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1. A method for generating data representative of characteristics of an image comprising:
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(a) inputting a plurality of face images; (b) transforming each of the face images into a two-dimensional discrete cosine transform (DCT) to obtain DCT coefficients, wherein each of the DCT coefficients includes DCT amplitude and DCT sign; (c) determining a plurality of average DCT amplitudes by averaging DCT amplitudes corresponding to each position of the DCT coefficients; (d) identifying average DCT amplitudes having at least a predetermined value and positions corresponding to the identified average DCT amplitudes; (e) storing positional information corresponding to the identified average DCT amplitudes; (f) inputting a first face image at an image input part; (g) transforming the first face image into a two-dimensional DCT at a DCT conversion part to obtain DCT coefficients, wherein each of the DCT coefficients includes DCT amplitude and DCT sign; (h) extracting the DCT signs from the DCT coefficients for the first image based on the stored positional information; and (i) generating a one-dimensional binary signal representation of the first face image based on the extracted DCT signs. - View Dependent Claims (2, 3, 4, 5)
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Specification