JP2002279426A - System for personal authentication - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable an algorithm for extracting authenticating patterns to exclude recognizing and receiving of objects other than the venous patterns of the back of a human hand. SOLUTION: Video signal input of the venous patterns of the back of a hand 1 is conducted. An imaging in an inscribed quadrangle of the back of the human hand 2 is conducted. Conventionally, since filtering 5 is immediate started, images of objects other than the venous patterns of the back of the hand could be recognized and received. In this system, the images to be photographed are confirmed to be the back of the hand at prefiltering 3. Additionally determination as to be the influencing signal of an organism is performed. By the prefiltering 3, 4, recognizing and receiving of the objects other than venous patterns of the back of the hand can be fully excluded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a unique feature possessed only by the vein of the back of the human hand, as a pre-filtering function, in an algorithm for extracting an authentication pattern of a vein pattern authentication device as a personal authentication system, An individual using a vein pattern authentication system that eliminates recognition and acceptance of objects other than the vein pattern of the back of the human hand by capturing the biometric features of the back of the human hand by comparing the features of the pattern in a small area and comparing the histogram distribution features Regarding the authentication system.

[0002]

2. Description of the Related Art Conventional personal authentication devices can authenticate the characteristic pattern of a living body, but most of them do not have a biometric authentication function. It is said that almost all fingerprint authentication technologies can register and authenticate an artificial finger. The conventional vein pattern authentication device also has a drawback of recognizing an object other than the vein pattern.

The present invention solves such a conventional problem. A vein pattern authentication device as a personal authentication system uses a texture segmentation method as a pre-filtering function, that is, a texture segmentation method as a pre-filtering function. Due to the unique feature of the vein of the back of the hand only, that is, the method of comparing the connectivity and the features of the pattern of a small area and the histogram distribution feature comparison, when the back of the human hand is photographed with an infrared camera, it is reflected by the back of the human hand It is a comparison of the characteristics of the image (light / dark) histogram distribution of the back of the hand to confirm that there is a clear difference between the light and darkness of the hand and other objects, for example, the light and dark reflected from a photo of a back of a hand such as a card. It is. An object of the present invention is to provide a system capable of excluding recognition and acceptance of an object other than a vein distribution on the back of a human hand by the pre-filtering process.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in order to solve such a problem, and an algorithm for extracting an authentication pattern of a vein pattern authentication apparatus as a personal authentication system has a pre-filtering function. Infrared camera photographed the back of a human hand using the texture segmentation method, a method that compares the unique characteristics of only the veins of the back of the human hand, that is, its connectivity and the characteristics of the handle of a small area, and a histogram distribution feature comparison. It is the image of the back of the hand that confirms that there is a clear difference between the light and dark reflected on the back of the human hand and the light and dark reflected from other objects, such as a card or a photo of the copied back of the hand. This is to compare the features of the histogram distribution. By this pre-filtering processing, recognition acceptance of objects other than the vein distribution on the back of the human hand is excluded.

[0005]

Therefore, according to the present invention, in the vein pattern authentication apparatus for the back of the human hand as a personal authentication system, the texture segmentation method and the histogram distribution are used as the pre-filtering processing in the processing of the authentication pattern extraction algorithm. By using the processing, the biometric authentication of the vein pattern of the back of the human hand becomes possible, and it becomes possible to completely eliminate recognition and acceptance of objects other than the vein distribution of the back of the human hand.

Hereinafter, the configuration of an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic flowchart of an algorithm for extracting an authentication vein pattern in the vein pattern authentication system according to the present invention.

FIG. 1 is a schematic flowchart of an algorithm for extracting an authentication vein pattern in the vein pattern authentication system. The operation of the personal authentication system using the vein pattern authentication system configured as described above will be described with reference to the schematic flowchart of FIG. First, in step 1, a video signal of a vein pattern of the back of a human hand is input using a CCD camera. In step 2, an image of an inscribed quadrilateral image of the back of the human hand is captured. In the conventional vein pattern authentication system, step 5
, It is possible to recognize and accept an image of an object other than the vein pattern of the back of the human hand. In the present invention, as a pre-filtering process before entering the low-band filtering process in step 5, a texture segmentation process in step 3 in which the unique characteristics of only the vein of the back of the human hand, that is, the connectivity and the characteristics of a small area are compared. To check whether the image of the object to be captured is the back of a human hand. Step 4
When the back of a human hand is affected by an infrared CCD camera, there is a clear difference between the light and dark reflected from the back of the human hand and the light and dark reflected from other objects such as a card or a photo of a reproduced back of the hand. The feature comparison process of the histogram distribution is performed to compare the features described above, and it is determined whether the signal is an image signal from a living body. By performing the pre-filtering processing in Steps 3 and 4, biometric authentication of the vein pattern of the back of the human hand becomes possible, and recognition and acceptance of objects other than the vein distribution of the back of the human hand can be completely eliminated. . As described above, after performing the pre-filtering process according to the present invention and performing the pre-filtering process for confirming the biometric authentication of the back vein pattern of the human hand, the low band for smoothing the gray scale in step 5 is performed. A filter process is performed, and a high-band filter process is performed in Step 6 to separate a blood vessel part and a background part of the vein of the back of the hand. Because of the appearance of finely cut blood vessels, median filter processing is performed and noise processing is performed. By performing these processes, a digital signal of the vein pattern of the back of the hand unique to the human is obtained in step 9.

As described above, according to the above-described embodiment, as a personal authentication system, in a vein pattern authentication apparatus on the back of a human hand, a texture segmentation method and a histogram are used as a pre-filtering process in an authentication extraction algorithm processing process. By using the distribution feature comparison processing, the vein pattern can be biometrically recognized on the back of the human hand, and recognition of objects other than the distribution of the back of the human hand can be completely eliminated.

[0009]

According to the present invention, the unique feature of only the vein of the back of the human hand, that is, its communicability and small area, as a pre-filtering function in the algorithm for extracting the authentication pattern of the vein pattern authentication apparatus as the personal authentication system, is provided. By comparing the features of the pattern of the hand and the histogram distribution feature comparison, it is possible to exclude the recognition acceptance of objects other than the vein pattern of the back of the human hand by capturing the biological characteristics of the back of the human hand. Unauthorized access such as impersonation becomes possible.

[Brief description of the drawings]

FIG. 1 is a flowchart of an algorithm for extracting an authentication vein pattern in a vein pattern authentication system.

[Explanation of symbols]

1. 1. Video signal input 2. Approach to the image of the vein on the back of the hand 3. Texture, segmentation, filter processing 4. Histogram distribution feature comparison processing Low band filter 6. 6. High bandwidth filter processing 7. Binary processing of image signal Median filter processing 9. Digital signal

Claims (3)

[Claims] 1. A vein pattern authentication device having a biometric authentication function. 2. The personal authentication system, wherein the biometric authentication function performs a pattern authentication process called a texture segmentation method. 3. A personal authentication system characterized by adding a histogram distribution characteristic comparison method as the biometric authentication function.