BIOMETRIC AUTHENTICATION DEVICE AND BIOMETRIC AUTHENTICATION METHOD
First Claim
1. A biometric authentication device which performs biometric authentication of a user using a biometric image in which an object carrying biometric information of the user is photographed, comprising:
- an illumination light source which illuminates the object;
a sensor which generates a plurality of illumination images in which the object is photographed in a state where the illumination light source is turned on, and at least one non-illumination image in which the object is photographed in a state where the illumination light source is turned off;
a difference image generating unit which generates a plurality of difference images by subtracting from a luminance value of each pixel of each illumination image a luminance value of corresponding pixel of the non-illumination image; and
a biometric image generating unit which realizesan integration number determination function determining an integration number, based on a statistical value of luminance values of a first difference image which represents an amount of noise superimposed on the first difference image among the plurality of difference images, so that the integration number of the difference images increases as an influence of luminance values of the pixels included in at least one region of the first difference image due to the noise superimposed on the first difference image increases, andan image integration function generating the biometric image by calculating luminance values of respective pixels of the biometric image based on a total of luminance values of the corresponding pixels of the difference images, the number of which is the integration number, among the plurality of difference images.
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Abstract
A biometric authentication device includes: a sensor which generates illumination images in which an object carrying biometric information is photographed while a light source is turned on, and a non-illumination image in which the object is photographed while the light source is turned off; a difference image generating unit which generates difference images by subtracting from a luminance value of each pixel of each illumination image a luminance value of corresponding pixel of the non-illumination image; and a biometric image generating unit which determines an integration number, based on a statistical value of luminance values of a first difference image, so that the integration number increases as an influence of luminance values of pixels included in at least one region of the first difference image due to the noise superimposed on the first difference image increases, and generates the biometric image based on the integration number of the difference images.
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Citations
14 Claims
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1. A biometric authentication device which performs biometric authentication of a user using a biometric image in which an object carrying biometric information of the user is photographed, comprising:
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an illumination light source which illuminates the object; a sensor which generates a plurality of illumination images in which the object is photographed in a state where the illumination light source is turned on, and at least one non-illumination image in which the object is photographed in a state where the illumination light source is turned off; a difference image generating unit which generates a plurality of difference images by subtracting from a luminance value of each pixel of each illumination image a luminance value of corresponding pixel of the non-illumination image; and a biometric image generating unit which realizes an integration number determination function determining an integration number, based on a statistical value of luminance values of a first difference image which represents an amount of noise superimposed on the first difference image among the plurality of difference images, so that the integration number of the difference images increases as an influence of luminance values of the pixels included in at least one region of the first difference image due to the noise superimposed on the first difference image increases, and an image integration function generating the biometric image by calculating luminance values of respective pixels of the biometric image based on a total of luminance values of the corresponding pixels of the difference images, the number of which is the integration number, among the plurality of difference images. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A biometric authentication method which performs biometric authentication of a user using a biometric image in which an object carrying biometric information of the user is photographed, comprising:
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generating a plurality of illumination images in which the object is photographed in a state where an illumination light source is illuminating the object, and at least one non-illumination image in which the object is photographed in a state where the illumination light source is turned off; generating a plurality of difference images by subtracting from a luminance value of each pixel of each illumination image a luminance value of corresponding pixel of the non-illumination image; determining an integration number, based on a statistical value of luminance values of a first difference image which represents an amount of noise superimposed on the first difference image among the plurality of difference images, so that the integration number of the difference images increases as an influence of luminance values of the pixels included in at least one region of the first difference image due to the noise superimposed on the first difference image increases; generating the biometric image by calculating luminance values of respective pixels of the biometric image based on a total of luminance values of the corresponding pixels of the difference images, the number of which is the integration number, among the plurality of difference images; and comparing the biometric information of the user with registered biometric information using the biometric image and data concerning the registered biometric information which is the biometric information of the registered user stored in a storage unit. - View Dependent Claims (9, 10, 11, 12, 13)
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14. An image generating device which generates a biometric image in which an object carrying biometric information of the user is photographed, comprising:
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an illumination light source which illuminates the object; a sensor which generates a plurality of illumination images in which the object is photographed in a state where the illumination light source is turned on, and at least one non-illumination image in which the object is photographed in a state where the illumination light source is turned off; a difference image generating unit which generates a plurality of difference images by subtracting from a luminance value of each pixel of each illumination image a luminance value of corresponding pixel of the non-illumination image; and a biometric image generating unit which realizes an integration number determination function determining an integration number, based on a statistical value of luminance values of a first difference image which represents an amount of noise superimposed on the first difference image among the plurality of difference images, so that the integration number of the difference images increases as an influence of luminance values of the pixels included in at least one region of the first difference image due to the noise superimposed on the first difference image increases, and an image integration function generating the biometric image by calculating luminance values of respective pixels of the biometric image based on a total of luminance values of the corresponding pixels of the difference images, the number of which is the integration number, among the plurality of difference images.
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Specification