JPH01175687A - Device for collating record of fingerprint data - Google Patents

Abstract

PURPOSE:To easily extract the feature point position of the data of a fingerprint itself by using the data of a finger profile line in addition to the fingerprint data itself. CONSTITUTION:A title device is provided with an illumination means 1, a light reception means 6 to receive a reflected light from a finger, and a storage means 8 to record the fingerprint data and the profile data of a finger is recorded in addition to the data of the fingerprint itself. When certain fingerprint data are compared with another fingerprint data, the feature point position of the fingerprint is specified with the use of the data of a finger profile line. Thus, the feature point position of the data of the fingerprint itself can be extracted at a high speed, only the vicinity of the feature point position can be collated with placing more emphasis on it, when it is a same time, a discrimination rate is higher than a conventional device.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a fingerprint data recording and collation device, and more particularly to a unit for extracting minutiae positions of a fingerprint.

Conventional technology Traditionally, fingerprints have been used to identify criminals using latent fingerprints from crime scenes, and recently large-scale systems have been constructed using computers. . Additionally, devices have been developed that verify fingerprint data when people enter important facilities. In these conventional fingerprint data recording and verification devices, from the image of the fingerprint itself,
One of its features is that it extracts the positions of minutiae of fingerprints. This technique is unavoidable when the fingerprint is a latent fingerprint or a fingerprint recorded on paper.
Extracting the positions of fingerprint minutiae is a problem of image processing and requires processing of a large amount of data.

Furthermore, recently, devices that perform electronic recording using optical elements instead of paper (for example, U.S. Pat. No. 4,537,488
No. 4) has also been developed, but it simply replaces paper and ink with optical elements and electronic records, and extracting the positions of fingerprint minutiae requires image processing of the fingerprint image itself, as in the past. I'm doing a good job.

Problems that the invention aims to solve Conventional image processing techniques for fingerprint images themselves require a large amount of data, and in order to speed up processing, high-speed arithmetic units and dedicated image processing elements are required. . These devices and elements are expensive and therefore can only be used in specific and limited applications.

Means for Solving the Problems The present invention has an illumination means for illuminating the finger, a light receiving means for receiving reflected light from the finger, and a storage means for recording fingerprint data. This is a fingerprint data record verification device that extracts the positions of minutiae of a fingerprint by recording contour data of the fingerprint.

Effect of the Invention In the present invention, image data of the fingerprint itself is input into the storage means by illuminating the finger with the illumination means and receiving reflected light from the finger with the light receiving means. At this time, data on the outline of the finger is also input into the storage means using the illumination means and the light receiving means. Since a human finger is thick, when capturing image data of the fingerprint itself and capturing data of the finger outline, it is desirable to move the focal position and capture the image in focus, for example. However, if the finger is not fixed, it is necessary to capture the image data of the fingerprint itself and the data of the finger outline at short time intervals. When using an optical system with a deep depth of focus, both data can be captured simultaneously.

When comparing one fingerprint data with another fingerprint data, the minutiae points of the fingerprint are compared, but the positions of the minutiae points of the fingerprint can be identified by performing image processing from the data of the fingerprint itself. In comparison, identification using finger contour data as in the present invention requires far less effort. This is because the outline of the finger provides a frame for the fingerprint image, making it easier to identify the position compared to an image of the fingerprint itself without a frame.

EXAMPLE An example of the present invention will be described below with reference to FIG. The illumination means 1 uses a planar light emitting diode as a light source 2. Further, by placing the light diffusing plate 3 apart from the light source 2, it is possible to prevent the light from the light source 2 from quickly diffusing and reducing its intensity by the time it hits the finger 9. That is, the lighting means 1
The light source 2 includes a light source 2 including a plurality of light emitting diodes and a directional lens, and a light diffusing plate 3.

Light from the illumination means 1 hits the finger 9, and the reflected light reaches the light receiving means 6 via the reflecting mirror 4 and the condensing lens 6. Here, the light receiving means 6 is constructed using a two-dimensional COD element. The fingerprint image is created by the COD device using light.
It is electrically converted and input as a voltage change to the 0 port of the 1-step CPU 7. Furthermore, it is stored in a storage means 8 connected to the 1-chip 0PU7 by bus. In this embodiment, the storage means 8 is constructed using a RAM because of its quick response speed.

The data of the finger outline can be similarly stored in the storage means 8 by the illumination means 1 and the light receiving means 6. At this time, the outline of the finger is shown as a line segment Mu5' indicating the side surface of the finger 9. In this embodiment, since the depth of focus is approximately 20 ff, it is possible to simultaneously capture data on the fingerprint itself and data on the contour of the finger without moving the optical system.

In another example, in order to make the outline of the finger clearer, auxiliary illumination was applied from above the finger (above the nail), and good results were obtained.

FIG. 2 shows an example of the data of the fingerprint itself and the data of the contour line of the finger obtained by the above embodiment. An example with finger outline data is shown. Of the finger contour data 10, it is desirable to determine the direction in which light is applied to the fingertip contour data so that the data does not vary depending on the length of the nail. Also, when the finger rotates, the finger outline data 1
Since the positional relationship between 0 and the data 11 of the fingerprint itself is not constant, for example, by preparing a flat surface on which the entire army is placed and placing the palm in close contact with the flat surface, the angle of the fingers can be made constant. good. In the above embodiment as well, it is possible to reduce the inclination of the fingers by providing a flat surface on which the palm is placed, which is fixed to the light receiving means.

Effects of the Invention According to the present invention, by using the data of the finger outline in addition to the data of the fingerprint itself, it is possible to easily extract the positions of minutiae of the data of the fingerprint itself. This makes it possible to provide a simpler fingerprint data record verification device.

However, since the positions of minutiae in fingerprints are the same for each fingerprint, the fingerprint data recording and verification device according to the present invention is particularly useful for personal identification applications, since the fingerprint data recording and verification device according to the present invention can be It is possible to extract the minutiae positions of the data of the fingerprint itself at high speed, and it is possible to match only the vicinity of the minutiae positions, and in the same amount of time, compared to conventional equipment. This also has the effect of increasing the identification rate.

Furthermore, according to the present invention, since the finger is observed three-dimensionally, it is expected that false data can be effectively eliminated.

[Brief explanation of the drawing]

FIG. 1 is a diagram illustrating the main parts of a fingerprint data recording and verification device showing an embodiment of the present invention, and FIG. 2 is a diagram showing data of the fingerprint itself and finger outline data captured by the device. be. 1...Lighting means, 2...Light source, 3...
...diffusion plate, 4...reflector, 6...condensing lens, 6...light receiving means, 7...1 chip C
PU, 8... Storage means, 9... Finger, 10...
...Finger outline data, 11...Data of the fingerprint itself. Name of agent: Patent attorney Toshio Nakao and 1 other person 4-
One-man autopsy 10-finger sIE beads 9 ta'-ta

Claims (2)

[Claims] (1) It has an illumination means for illuminating the finger, a light receiving means for receiving reflected light from the finger, and a storage means for recording fingerprint data,
1. A fingerprint data recording and verification device that extracts the positions of minutiae of a fingerprint by recording finger outline data in addition to the data of the fingerprint itself. (2) It has an illumination means for illuminating the finger, a light receiving means for receiving reflected light from the finger, a storage means for recording fingerprint data, and a flat part on which the palm is placed to reduce the inclination of the finger, and the fingerprint itself 1. A fingerprint data record verification device, which extracts the positions of fingerprint minutiae by recording finger outline data in addition to the above data.