JPS62266686A - Fingerprint collating device - Google Patents

Abstract

PURPOSE:To execute a collating work with high reliability by providing a means for reading information on the external form of a fingertip which gives a reference for positional relation of a fingertip against a measuring surface of an optical means, so that an image of a fingerprint pattern to an outline of the fingertip becomes uniform. CONSTITUTION:When a fingertip F is made to about on the surface of measuring surface 6b, a collimator 11 is lighted, and light beams L3 are scattered and reflected in a fingertip background area. By this scatter reflection, a television camera 12 executes an image pickup of a fingertip shape image, and a fingertip shape image data is sent out to a processor 8. Subsequently, a collimator 1 is lighted, a raised line part and a ruled line part of a fingerprint P in a fingerprint measuring area corresponding to a mat member notch part 10 on the measuring surface 6b are obtained as a bright and dark pattern, and it is brought to an image pickup by a television camera 7 and sent out to the information processor 8. Accordingly, the processor 8 can position exactly a fingerprint pattern by fingertip external form information, and can execute exactly a comparison and a collation.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applied to a fingerprint verification device, for example, a security device, etc., which reads and stores the fingerprint of a fingertip placed on an optical device such as a prism as image information. It relates to a device that accurately identifies individuals by comparing information.

[Conventional technology]

FIG. 3 shows a "concave-convex pattern input device" as a conventional fingerprint verification device disclosed in, for example, Japanese Patent Application Laid-open No. 55-13-146. In the figure, 1 is a collimator as a light source, and 2 is this collimator. 1 is a cylindrical case, 3 is a lamp of the collimator 1 equipped with a reflecting mirror 3a, 4 is a shielding plate having a pinhole 4a, and 5 is a parallel light beam-forming case attached to the opening of the case 2. is a convex lens, 6 is a prism as an optical means on which the ventral side of the fingertip F is placed, 7 is a television camera that converts an image of the fingerprint P of the fingertip F as a pattern by the reflected light from the prism 6, 7a is the lens, Reference numeral 8 denotes information processing means, which includes a signal conversion section that converts the fingerprint pattern image-converted by the television camera 7 into electrical signal information, an information processing section that stores this information and compares it with other information, etc.; is a cable.

Next, the operation will be explained. The processing device 8 is composed of a central information processing unit CPU such as a computer, and is connected to, for example, a security device and is on standby for fingerprint verification. First, when the fingertip F of the subject having the fingerprint P to be compared comes into contact with the prism 6, the fingerprint P is captured as an image by the TV camera 7 using the reflection of parallel light from the collimator 1. .

For this ↑most image, first, collimator 1 lamp 2
is turned on, and a parallel light beam L1 is irradiated onto the surface 6a of the prism 6 by the convex lens 5 through the pinhole 4a. This parallel light beam L1 is reflected by the surface 6b on which the fingertip F is placed and exits from the surface 6c.
Among these, the ridges that are raised as mountain-like lines are in contact with the upper surface of the surface 6b, and the grooved lines that are carved as trough-like lines are not in contact with the upper surface of the surface 6b. The parallel light beam L1 irradiated on the non-contact marked line becomes totally reflected light and exits from the surface 6C to become the output light L2, and since the ridge of the fingerprint P is in contact with the upper surface of the surface 6b, this The parallel light beam L1 irradiated onto the portion becomes non-totally reflected light and does not exit from the surface 6c.

Therefore, the ridges of the fingerprint P are imaged by the television camera 7 as a dark pattern, and the marked lines and the portion outside the outline of the fingertip F are imaged as a bright pattern. The fingerprint P imaged in this manner is input to the processing device 8 such as the CPU described above, is converted into an electrical signal by a signal converter, and is then sent to a semiconductor memory RAM for writing/reading via an information processing unit. The information can be stored and registered, or can be compared with information stored in a read-only semiconductor memory ROM for verification.

[Problem that the invention seeks to solve]

Since the conventional fingerprint verification device is configured as described above, the prism 6, etc. It is unclear whether or not the fingerprint is accurately positioned so that it is always in the same position on the measurement surface on the top side of the optical means, and as a result, fingerprints consisting of a wide variety of patterns are read and processed without a reliable standard. As a result, there is a problem in that images of fingerprints of the same subject are processed as different information.

This invention was made in order to solve the above-mentioned problems, and it is necessary to always position the external shape of the fingertip containing the fingerprint to be collected at the same position with respect to the measurement surface of the optical device for each measurement occasion. It is an object of the present invention to provide a fingerprint matching device that can perform highly reliable matching by keeping the image of a fingerprint pattern relative to the contour of a fingertip constant.

[Means for solving problems]

In the fingerprint matching device according to the present invention, a fingertip background area that scatters and reflects the transmitted light from the outer part of the fingertip contour is formed on the measurement surface of the optical means, and a fingerprint reading area corresponding to the fingertip is formed, and the measurement surface is viewed from the optical means side. This device is provided with a second light source that irradiates a light beam to the fingertip, and a fingertip contour reading means that obtains fingertip contour information based on scattered reflection from the second light source.

[Effect]

The fingerprint verification device according to the present invention defines a fingerprint reading area by scattering and reflecting the light rays irradiated onto the background area outside the fingertip outline by the second light source and the fingertip outline reading means. converting optical information based on whether the fingertip in the fingerprint reading area is in contact with the measurement surface into an electrical signal using the light source and the converting means of No. 1, and processing the information from both means in the information processing means; Thus, the fingerprint pattern information within the reading area can be obtained, and the fingerprint pattern information is always obtained under the same conditions when reading the fingerprint. In this way, the reliability of fingerprint verification work can be improved.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
2, the same reference numerals as in FIG. 3 indicate the same or corresponding parts, and redundant explanation will be omitted. 10 is provided on the surface of the measurement surface 6b of the prism 6 as an optical means,
A mat member in which a notch 10a corresponding to the outline of the fingertip F is formed, 11 is a collimator provided below the prism 6 and serves as a second light source that irradiates the measuring surface 6b with a sufficient downward beam; 12 is a collimator for the prism 6 A second television camera 13 is provided above as a fingertip external shape information reading device, and a cable 13 connects the second television camera 12 and the information processing means 8.

Next, the operation will be explained. First is number 1. Although the collimators 1 and 11 as the second light source are off, the prism 6
When the fingertip F is brought into contact with the surface of the measurement surface 6b, the second
The collimator 11 as a light source is turned on, and the light beam L3 is scattered and reflected in the foreground region of the fingertip on the measurement surface 6b to which the mat member 10 is attached.

This scattered reflection causes the second television camera 12 to highlight the external image of the fingertip as a silhouette L4. When the second television camera 12 captures this fingertip outline image, it sends the fingertip outline information to the information processing device via the cable 13. At this time, since the notch 10a of the mat member 10 is set to be somewhat smaller than the actual contour of the fingertip, the fingerprint measurement site of the fingertip stands out with a bright contrast.

Next, when clear fingertip external shape information is obtained, the collimator 11 of the second light source is turned off and the collimator 1 of the first light source is turned on. The ridges of the fingerprint P within the measurement area,
The marked line portion is obtained as a bright and dark pattern in the same manner as in the past, and this is imaged by the first television camera 7, optical information is converted into an electrical signal, and fingerprint pattern image information is sent to the information processing means 8 via a cable 9. Sent out. The information processing means 8 processes the fingertip outline information and the fingerprint pattern information to reliably position and obtain the fingerprint pattern with respect to the fingertip outline, and based on this clear image information, it is stored in, for example, a RAM. Comparison and verification with fingerprint information, etc. will be performed.

Note that in the above embodiment, the first. Second television camera7.
12 and 1st. Although the explanation has been made assuming that a plurality of collimators 1 and 11 as the second light source are provided separately, mirrors, prisms, etc. are placed at positions calculated to design the optical path, and the same TV camera and the same light source are used to create a fingerprint pattern. It is also possible to take an image of the fingertip and read the fingertip external shape information.

Further, regarding the measurement process, the process described in the operation may be omitted, instead, the fingerprint pattern may be obtained and then the fingertip external shape information may be obtained, or the measurement process may be performed at the same time.

〔Effect of the invention〕

As described above, according to the present invention, since the fingertip contour information reading means is provided which serves as a reference for the positional relationship of the fingertip with respect to the measurement surface of the optical means, the fingerprint pattern information of the finger is read in correspondence with the fingertip contour information. This has the effect of providing a highly reliable fingerprint verification device with high accuracy and excellent reproducibility.

[Brief explanation of drawings]

FIG. 1 is a perspective view schematically showing a fingerprint identification device according to an embodiment of the present invention, FIG. 2 is a partially sectional front view, and FIG.
The figure is a partially sectional front view showing a conventional fingerprint identification device. In the figure, 1 is the first light source (collimator), 6 is the optical means (prism), 6b is the measurement surface, and 7 is the information conversion means (
8 is an information processing means, 10 is a scattering reflection member (mat member), 1 is a second light source (collimator), I2 is a fingertip external shape information reading means (second television camera), Ll is a parallel ray, I2 is an emitted light, I3 is a ray,
I4 is fingertip external shape optical information (shadow picture). Note that the same reference numerals in the figures indicate the same or equivalent parts. Procedural amendment (voluntary) Showa 6th pregnancy 7°V day

Claims (1)

[Claims] Parallel light rays are incident on the measurement surface that the fingertip contacts at a certain range of angles, and a fingertip background area that scatters and reflects the transmitted light rays from the outer part of the fingertip outline on this measurement surface and a fingerprint reading area that corresponds to the fingertip shape. a first light source that irradiates a parallel ray of light to the measurement surface of the optical means from the direction of the incident surface; and a second light source that irradiates the measurement surface of the measurement surface with a ray of light through the optical means. a light source located on the opposite side of the optical means with respect to the second light source;
a fingertip outer shape reading means for reading the outer shape of the fingertip by converting optical information based on scattered reflection of light rays emitted from the light source on the fingertip background region of the measurement surface into an electric signal as fingertip outer shape information; Conversion means for obtaining fingerprint pattern information by converting optical information of non-totally reflected light and totally reflected light generated by contact or non-contact between the measurement surface and the fingertip into electrical signals using parallel light rays emitted from the first light source. and information processing means for obtaining fingerprint information within a reading area based on the fingertip external shape information and the fingerprint pattern information.