The method of identification by the geometry of the palm

 

The invention relates to a method of identification parameters of the user's palm. It helps to ensure the technical result in the possibility of assessing the identity of the geometric parameters of the hand with minimizing the processed information, which reduces the authentication device, while maintaining reasonable accuracy. The method consists of placing as specified in the palms on a substrate that is transparent to optical radiation, lighting her structured optical radiation, the registration of cross-sections of the palm in the field of divorced fingers and use a combination of the received images for forming an optical image of the hands intended for control purposes. The technical result is achieved due to the fact that the registration of all cross-sections of the palm produce in passing through the substrate of the optical radiation by transferring images of each of the linear sections with its own optical systems on linear multi-element photographic. 3 C.p. f-crystals, 3 ill.

Various methods and devices for identification of the parameters of the user's palm, for example otpechatke in patent EP 076023, CL G 07 C 9/00, And 61 In 05/117, 1995, consists in positioning the user's hands precise way on the platform on top of the preview window, the reading section of the imprint of the palm of the user and comparing it with a known fingerprint, taken in advance.

Comparison of palm prints as well as fingerprints on individual picture, inherent only to a specific user, requires a rather complicated technical means to ensure quick and efficient processing of random pattern skin lines and receiving the comparison result.

In another device implemented method consisting in the use of measuring pulses passing through the hands, measuring the power of these pulses on a predetermined area of the polling device and comparing the measured signals with pre-defined. As such penetrating pulses can be used ultrasound (PCT 9625878, class. And 61 In 05/117, G 07 C 09/00, 29.08.96).

However, the constant exposure to penetrating radiation, and even quite gentle, sometimes may not be indifferent to individuals and cause adverse reactions.

There is a method of identification by the geometry of the hand, requires that the registration of images of the user's palm in the reflected radiation and comparing the obtained image with the previously obtained (patent EP 0209317, CL G 07 C 9/00, 1987).

There is a method of identification by the geometry of the palm, which consists in placing a given way with his hands on the substrate, transparent to the optical probe radiation, lighting her structured optical radiation, the registration at least two transverse linear sections of the palm in the field of divorced fingers and use the resulting images for forming an optical image of the hands intended for control purposes (patent US 5335288, CL G 06 K 9/00, 1994).

In a known solution to image cross-sections of the palm in the field of divorced fingers are used to obtain information about the height of the fingers relative to the level of the substrate and along with a silhouette image of a part of the palm are three-dimensional optical image of a hand. Such a device provides a relatively high reliability of identification, but is quite complex in hardware terms, and expensive.

The problem solved by the present invention is to develop a method and device that allows to estimate the identity of the geometric parameters of the hand with minimizing the processed information, which will provide significant cost reduction of the device, but with obespecheniya palm, which consists in placing a given way with his hands on the substrate, transparent to the optical probe radiation, lighting her structured optical radiation, the registration at least two transverse linear sections of the palm in the field of divorced fingers and use the resulting images for forming an optical image of the hands intended for control purposes, according to the invention, the registration of all transverse linear sections of the palm produce in passing through the substrate of the optical radiation, and an optical image of a hand shape in the form obtained by linear multielement photographic aggregate of one-dimensional images, represented as a set of separate illumination of the photographic elements.

The technical result is achieved in this case, is to simplify the processing and analysis of obtained images, because when you register a one-dimensional images, which carry information about the thickness (width) of the fingers in the form of a distribution of illumination along one of the coordinates coincides with the line of the recorded section, you can use a simple image processing algorithm and to abandon the complex equipment. Obviously, the more mo is on this Basis can be applied a variety of techniques.

For example, the recorded linear sections move relative to each other to ensure that they were specific differences. This shift can be carried out in parallel along the length of the fingers, or at some angle with respect to each other. They can also be formed without bias, but their registration is carried out under substantially different angles of incidence of the illuminating radiation. Thus will be formed two or more different kinds of information about my hand.

Lighting palm can be a pulsed light, and the registration of the linear sections simultaneously into non-overlapping sections of the linear photodetector.

In another embodiment, the lighting palm produce in different moments of time sources and the registration of images produced separately. You can use consistently the same linear plots of the photodetector.

In Fig. 1 schematically shows the hand of a user positioned in a certain way, in Fig.2 image linear sections, registered a linear photodetector in the form of a sequence of pulses proportional to the illumination of the individual elements of the photodetector of Fig.3 (a, b) - scheme one option. On a transparent substrate 1 with locating lugs 2 place the arm 3 down his hand. Stops 2 provide consistent placement of the hands with the fingers (Fig.1). As an informative parameter is used by several cross-sections in the toe area. In the shown embodiment, these sections are displaced relative to each other and are parallel to the line A-a, b-C on the lower side of the substrate 1 light hand light sources 4 and is transferred onto a linear photodetector 5 images selected for identification of linear sections. In the first embodiment (Fig. 3) use two independent optical systems 6 and 7, each of which transfers an image corresponding linear cross-section on a separate plot line of the photodetector 5. The illumination of each element of the photodetector depends on the geometry of the hand in the field of linear cross-section, and a set of network elements characteristic of the linear section of the hand distribution of illumination (see Fig.2). It is obvious that the reliability of identification increases with the number of recorded linear sections, limited by the length of the photodetector. However, this number can be optimized through the use of sections with clearly exp is Westley at the same time.

The second variant (not shown) allows the use of a limited length of the photodetector due to the posted time of registration of the individual line sections, which are transferred to the overlapping areas of the photodetector. Such registration becomes possible when spaced in time lighting.

When you implement this method, you must take reasonable compromise, providing the specified accuracy of recognition of the hand while minimizing the components and the simplification of the algorithm processing the received information. The analysis of captured images of cross sections of various users showed that when using the appropriate algorithms to process these images provided a sufficiently high conspicuity users.

Claims

1. The method of identification by the geometry of the palm, which consists in placing as specified in the palms on a substrate that is transparent to optical radiation, lighting her structured optical radiation, the registration of cross-sections of the palm in the field of divorced fingers and use the aggregate received izobrazitel all cross-sections of the palm produce in passing through the substrate of the optical radiation by transferring images of each of the linear sections with its own optical systems on linear multi-element photographic.

2. The method of identification by the geometry of the palm under item 1, characterized in that the registration of at least one of the linear sections produced under substantially different angles of incidence of radiation on hand.

3. The method of identification by the geometry of the palm under item 1, characterized in that the lighting palm produce a pulsed light source, and image recorded linear sections are transferred simultaneously into non-overlapping sections of the linear photodetector.

4. The method of identification by the geometry of the palm under item 1, characterized in that the illumination of different parts of the palm produce from different sources at different points in time and the image recorded linear sections is transferred to the elements of the photodetector are also at different points in time.

 

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