CZ31628U1 - A device for scanning dermatoglyphic palm patterns - Google Patents

Description

The Industrial Property Office does not ascertain in the registration procedure whether the subject of the utility model meets the conditions of eligibility for protection pursuant to Section 1 of Act no. No. 478/1992 Coll.

CZ 31628 Ul

Apparatus for sensing dermatoglyphic palm patterns

Technical field

The present invention describes a device for optical scanning of papillary lines in the palm area, designed as an extension of a mobile phone. The connected mobile phone provides both shooting with the built-in camera and user-friendly shooting and photo cataloging. It thus affects the field of biometry and computer technology.

BACKGROUND OF THE INVENTION

The scanning of papillary lines in the area of the fingertips of the fingers and palms is standardly used for a number of purposes, especially for biometric identification in forensic (dactyloscopy) and civilian applications. The structure of the papillary lines is based on biometric identity verification for official purposes, biometric passports, but also access systems, security of personal data (PCs, mobile phones), etc. In all cases, the identification of a person is based on the specific number, shape and location of the characteristic elements of papillary lines On hands. Thus, the fingerprint scanning methods must be able to clearly distinguish the individual lines, their endings, branches and the like.

The oldest and still widespread method of scanning papillary lines from the palm of your hand is direct imprinting on paper using color or graphite powder. In case of subsequent electronic processing (detection of characteristic points) and cataloging, it is necessary to scan the paper fingerprint. At the same time, it is the simplest and most affordable method of fingerprint capture.

Many physical principles are used for direct fingerprinting (sometimes referred to as "live scan"): optical (scans of dermatoglyph on a flat, transparent surface), capacitive or resistive (using different electrical properties of sensor areas, which are close to the skin in the area of the "ridges" as opposed to the "valleys", ultrasonic (time of return of very high frequency sound waves in different parts of the sensor), and others. The fingerprint can be scanned either at the same time or by successive scanning as you slide your finger across the narrow sensor. A number of sensors designed for operator-free operation, also to reduce forged fingerprints, integrate methods for verifying the living nature of the sample based on optical (eg, multispectral method. Lumidigm US patent US7831072 B2) or electrical properties of living tissue (eg CZ patent application 1998 -991).

Identification is most widespread based on the dermatoglyph of the tummy of one or more fingers, which is associated with the largest extension of the device with the sensing surface corresponding to one finger of the finger (approx. 20x30 mm). For the purposes of police filing cabinets, in addition to the fingers of all the fingers on the hands, a handprint is also often stored in the database, and there are devices that scan all ten fingers simultaneously (so-called "ten-print"). the whole palm including the fingers (palm print). Such devices have a sensing area of about 130x130 mm and usually employ the optical principle. These include products from Futronic, Papillon Systems, Suprema, Crossmatch, Changchun Fangyuan Opto-Electronic Technology, Nitgen & Co., and many others. In all the cases we know, these are large and costly devices designed to operate in one place, eg in the office. The proposed solution, on the other hand, describes a very inexpensive and easily portable system that allows scanning of papillary lines (palm) even in the field using a mobile phone.

There are also solutions that allow optical fingerprint reading using a mobile phone, such as Touch ID spol. However, Nurugo, or the Grabba S-Series mobile phone accessory, has too little a scanning area for the palmprint, which is also difficult to access when scanning areas other than the fingertips. In addition, they are often solutions designed for several selected types of mobile phones, which reduces their versatility and can cause backward compatibility problems.

However, papillary lines that develop along with the upper layer of skin - and also, for example, the central nervous system - in the second trimester of prenatal development, are also subject to scientific research. Mj. because the marked asymmetry of the papillary lines on both sides of the body may indicate embryonic development and possible neurodevelopmental defects. For example, the association of a reduced number of papillary lines on the palm between the first and second triadium (the so-called "a-b ridge"

- 1 CZ 31628 Ul count ') with schizophrenia (Faňanas 1990, Faňanas 1996, Fearon 2001). For this reason, it may be very interesting to examine the number of papillary lines on larger areas of the palm.

For these and other purposes, the proposed solution can be used, which is very cheap and at the same time easily portable.

Faňanás. L., Moral, P., & Bertranpetit, J. (1990). Quantitative dermatoglyphics in schizophrenia: study of family history subgroups. Human Biology, 62 (3): 421-427.

Fananas, L., van Os, J., Hoyos, C., McGrath, J., Mellor, C.S., & Murray, R. (1996). Dermatoglyphic a-b ridge count as a possible marker for developmental disturbance in schizophrenia: replication in two samples. Schizophrenia Research, 20 (3): 307-314.

Fearon, P., Lane, A. Airie, M., Scannell, J., McGowan, A., Byme, M., ... O'Callaghan, E. (2001). Is reduced dermatoglyphic a-b ridge count a reliable marker of developmental impairment in schizophrenia? Schizophrenia Research, 50 (3), 151-157.

The essence of the technical solution

The subject of the application is a device for recording papillary lines (dermatoglyphs), particularly in the palm area. The device is designed as an extension to the mobile phone, which results in simpler and more comfortable operation, as well as significantly lower costs for the whole solution.

The device uses the principle of full reflection in the optical prism. Touching the palm at the places where the papillary lines touch the prism changes the relative refractive index, and such places appear dark. Standardized illumination of the sensing area is important for high repeatability. For this purpose, the device contains its own light source in the form of two miniature LEDs, powered by a built-in battery.

The camera in the connected mobile phone is used as a recording medium, which ensures ease of portability and usability for field measurements. The mobile phone is equipped with a specially designed application that makes it easy to capture and sort the recorded fingerprints.

Fingerprint images can be analyzed in a PC software application that allows preprocessing of images (focusing and contrasting papillary lines using directional filters) and automatic detection of triads with manual correction. Using a larger prism, it is possible to scan a larger palm area than standard fingerprint readers. This is necessary, for example, to measure the distance between the triad (that is, the areas where the papillary lines divide and form a "Y" shape) in the upper part of the palm, which is used in research to identify neurodevelopmental defects. it is not possible to scan using standard fingerprint readers.

The device can be used with many types of mobile phones, making it possible to use a phone that is already available to the user and thus leads to a significant cost reduction for the whole solution. The essential requirement for the type of telephone used is, in particular, a sufficiently short minimum focusing distance and the quality of the camera affecting the quality of the resulting images. If the phone you are using has a built-in camera lens located at the top of the device, you can use the ergonomic phone mount, where the edges of the phone are approximately aligned with the edges of the device.

Clarification of drawings

Giant. 1: the diagram shows the arrangement and function of the device in cross-section.

Examples of technical solutions

An example of a mechanical embodiment of the device is shown in Fig. 1: The basic mechanical element is the chassis of the device 1, which defines the location of the mobile phone 2 and ensures the correct angle between the camera 2b of the connected telephone and the prism 3 leading to complete reflection. The hand 6 of the sensed person is placed on the device so that the sensed area of the palm 6b is in direct and close contact with the exposed area of the prism 3. The illumination is realized by a pair of miniature LEDs

-228 31628 UI of diodes 4 located perpendicular to the sense direction in both prism bases. The LEDs are powered from the built-in battery 5 via a switch located on the outside of the housing.

The cover material on the inside of the prism and camera shaft has a matt black finish to avoid excessive reflections on the inside that could reduce the quality of the recorded images.

The design of the apparatus may take a number of forms, and the cover may be of all sides closed with a cell phone opening and a bevelled corner for the exposed prism wall, as shown in Fig. 1. The shape of the cover itself may be modified if the correct prism angle is maintained against the camera and the free shaft in the upper part. However, the arrangement shown in Fig. 1 also allows for convenient placement of the device on the mat during measurement, which facilitates the correct placement of the palm while allowing convenient operation of the phone from the opposite side.

Thus, in this basic arrangement, the sensed person sits opposite the operator of the device. The material of the housing is not essential for the operation of the device, for example 3D plastic printing, which enables precise mounting of individual components and is advantageous for very small series.

Compared to existing electronic palm sensing solutions, the present device has advantages, in particular, at very low acquisition costs and easy portability of the instrument for field measurements. Compared to conventional dermatoglyph paper or graphite powder solutions, the advantage is easier management and transfer of scanned images to the database (no digitization and cataloging), as well as greater comfort for the person being scanned (no dirt on the palm).

Industrial applicability

Apparatus The device for sensing dermatoglyphic palm patterns according to this technical description is useful, for example, in the field of psychiatry for the determination of neurodevelopmental variants of serious mental illnesses, in the field of pediatric and adolescent medicine for identification of developmental defects and in forensic sciences.

Claims (3)

Apparatus for scanning papillary lines, characterized in that an optical prism (3) for detecting the palm of the hand (6) is arranged in a cut-out slopingly arranged cover wall located between the upper wall and the front wall of the cover of the device, the device is 30, a scanning camera (2b) is positioned. Device according to claim 1, characterized in that the scanning camera (2b) is installed in a mobile phone (2) which is attached to the housing of the device. Device according to claim 1 or 2, characterized in that at least one light source (4) is provided in the bases of the optical prism (3) to illuminate the sensing area. Device according to one of the preceding claims, characterized in that an optical prism (3) having dimensions for detecting larger areas of the palm, in particular for measuring the distance between the triads, is provided.