Fingerprint image input device and living body identification method using fingerprint image
First Claim
1. A fingerprint image input device comprising:
- an image input unit for sequentially acquiring a plurality of fingerprint images of a finger pressed against a detector surface;
a color detection unit for detecting a color of said finger in synchronization with input of said plurality of fingerprint images;
a pressure detection unit for detecting a physical quantity reflecting a pressure applied by said finger to said detector surface when said plurality of fingerprint images are acquired; and
a determination unit for determining whether said finger is a live or dead one by analyzing a correlation between said physical quantity and the color of said finger.
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Accused Products
Abstract
A color image sensor sequentially acquires a plurality of fingerprint images when a finger is pressed against the detector surface. A color information extraction unit detects the finger color in synchronization with the input of the plurality of fingerprint images. An areal information extraction unit detects a physical quantity representing the pressure applied by the finger to the color image sensor when the plurality of fingerprint images are acquired, particularly, the quantity related with the area of the finger in contact with the detector surface. A living body identification unit determines whether the finger is a live or dead one by the analysis of correlation between the physical quantity and the finger color. According to this configuration, even if the finger color does not change much, it is possible to distinguish living bodies from dead ones if there is a sufficient correlation with information such as the area of the fingerprint that reflects the finger pressure. The thickness of the fingerprint input unit is approximately 1-2 mm, determined by the sum of the thickness of the planar light source and that of the color image sensor.
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Citations
14 Claims
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1. A fingerprint image input device comprising:
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an image input unit for sequentially acquiring a plurality of fingerprint images of a finger pressed against a detector surface;
a color detection unit for detecting a color of said finger in synchronization with input of said plurality of fingerprint images;
a pressure detection unit for detecting a physical quantity reflecting a pressure applied by said finger to said detector surface when said plurality of fingerprint images are acquired; and
a determination unit for determining whether said finger is a live or dead one by analyzing a correlation between said physical quantity and the color of said finger. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A fingerprint image input device comprising:
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a color image sensor for acquiring color image data of a fingerprint of a finger in close contact with an image input surface;
an image temporary storage unit for storing said fingerprint image data;
an areal information extraction unit for extracting areal information of said fingerprint from said fingerprint image data;
a color information extraction unit for extracting color information of said fingerprint; and
a living body identification unit for determining whether said finger is a live or dead one by examining a correlation between said areal information and color information and by referring to a predetermined threshold and a coefficient of correlation with the fingerprint area calculated for each of predetermined colors. - View Dependent Claims (8, 9, 10)
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11. A fingerprint-based living body identification method comprising the steps of:
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acquiring a color fingerprint image data of a finger in close contact with an image input surface;
storing said fingerprint image data in a temporary memory;
extracting an areal information of said fingerprint from said fingerprint image data;
extracting a color information of said fingerprint; and
determining whether said finger is a live or dead one by examining a correlation between said areal information and said color information and by referring to a predetermined threshold and a coefficient of correlation with the fingerprint area calculated for each of predetermined colors. - View Dependent Claims (12, 13, 14)
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Specification