Personal identification device and method
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Abstract
The invention aims at providing personal identification in environments where non-contact is required, with high accuracy even though using a finger vein pattern images unclear and susceptible to positional deviations, wherein it has: a means for acquiring finger vein patterns without contact; a means for carrying out rotational correction using the outline of a finger as a method of taking out a vein pattern contained in the acquired image; a means for normalizing the position of the finger image with reference to the fingertip; a means for acquiring an overall vein pattern statistically by repetitively tracking regions of dark luminance intensities for a desired length from a desired position in the image; a matching means for comparing regions where vein patterns manifest vivid features; and a means for independent matching of subregions and evaluating positional deviations where matching is recognized.
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Citations
38 Claims
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1-27. -27. (canceled)
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28. A personal identification apparatus comprising:
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a light source;
a camera which captures a light transmitted through a set finger to generate an image; and
an image processing unit which extracts a blood vessel pattern from an image captured by the camera and executes personal identification using the blood vessel pattern and a registered pattern, wherein the image processing unit classifies pixels in the blood vessel pattern into three categories, these categories being a first category in which no blood vessel is supposed to be present, a second category in which a blood vessel is highly likely to be present and a third category in which a blood vessel may or may not be present, and wherein the image processing unit executes personal identification using the pixels which are classified into the first and second categories. - View Dependent Claims (29, 30, 31, 32, 33)
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34. A blood vessel pattern extraction apparatus for a personal identification comprising:
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a light source;
a camera which captures a light transmitted through a set finger to generate an image; and
an image processing unit which extracts a blood vessel pattern from the image captured by the camera, wherein the image processing unit classifies pixels in the blood vessel pattern into three categories, these categories being a first category in which no blood vessel is supposed to be present, a second category in which a blood vessel is highly likely to be present and a third category in which a blood vessel may or may not be present, and makes personal identification possible using the pixels which are classified into the first and second categories. - View Dependent Claims (35, 36, 37, 38)
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Specification