RU75296U1 - ANAMORPHOTIC READING SYSTEM OF PAPILLARY DRAWINGS OF THE EXTREME FALANGES OF THE FINGERS - Google Patents

Abstract

The proposed device and method relates to the reading and transmission of images of papillary patterns (PU) of the extreme phalanges of the fingers used in automated biometric information identification systems. Technical results of the utility model: improving the quality of the source data entering the personality identification system; increasing the uniformity of illumination and contrast of various images of papillary patterns; polychromatic distortion and system cost reduction. An anamorphic PU reading system contains a monochromatic radiation source (AI) and additional AI (DII), an optical system (OS), including, but not limited to, an aperture diaphragm lens and an optical element (OE) for applying the extreme phalanx of the finger, and a multi-element photodetector ( MF). In this case, one of the surfaces of the MA is made reflective-spherical, convex outward. The MF is connected to the controller and tilted to the optical axis. AI and DII are hardware-software-controlled, allowing to obtain radiation uniform illumination and contrast of images. The direction of radiation to the surface from the PU in the OE projects, when passing through the OE in the OS, onto the MF the place of direct contact of the papillary line with the working surface of the OE causing a greater signal intensity compared to a place free from direct contact. DII and AI are activated periodically.

Description

Technical field

The proposed device relates to the reading and transmission of images of papillary patterns of the extreme phalanges of the fingers used in automated biometric information identification systems.

State of the art

Analogs to the proposed device can be considered:

1. Fingerprint reader for identification, US patent No. 5222152 according to MKI G06K 09/00, op. 22.6.1993, including a light source, an optical system containing, including, an optical element for applying a finger, and a fingerprint image recorder.

2. Device for registering a papillary pattern, RF patent No. 2185096 according to MKI A61B 5/117, op. 07.20.2002, including a light source, an optical system, including, inter alia, an optical element for applying a finger, and a system of photodetector elements connected to the image processing unit.

The disadvantages of the analogues are: insufficiently high quality of the initial data over the entire contact area of the papillary drawings of the extreme phalanges of the fingers with the working surface of the optical element entering the identification system, insufficiently uniform contrast of various images of the papillary patterns due to different characteristics of the presented papillary patterns and lighting characteristics of the optical element, which is applied papillary drawing of the extreme phalanges of the fingers.

The closest in technical essence, the prototype for the proposed device is “Anamorphic system for reading papillary drawings”, RF patent No. 2298222 according to MKI G06K 09/00, op. 04/27/2007, including an optical light source

a system including, inter alia, an optical element for applying a finger, and a multi-element photodetector in the form of a CCD array.

The disadvantages of the prototype are: insufficient quality of the source data over the entire contact area of the papillary drawings of the extreme phalanges of the fingers with the working surface of the optical element entering the personality identification system, insufficiently uniform contrast and illumination of various images of the papillary patterns due to various characteristics of the presented papillary patterns and lighting characteristics of the optical element to which the papillary drawing of the extreme phalanges of the fingers is applied.

Utility Model Essence

The geometric dimensions of the scanner optical system are reduced by “compressing” the image of the papillary pattern transmitted to the multi-element photodetector by subjecting it to anamorphy and de-morphing to obtain the desired undistorted image. At the same time, to improve the quality of images transmitted to the personality identification system, it is necessary to ensure a sufficiently high contrast and uniformity of illumination of the working surface in the system, to which papillary drawings of the extreme phalanges of the fingers are applied.

The objective of the utility model is to improve the quality of the source data entering the personality identification system, increase the contrast and uniformity of illumination of various images of papillary patterns, reduce the cost of the system, reduce polychromatic distortions.

Technical results of the utility model:

1) improving the quality of the source data entering the system of personal identification;

2) increasing the contrast of various images of papillary patterns;

3) increasing the uniformity of illumination of various images of papillary patterns;

4) reducing the cost of the system;

5) reduction of polychromatic distortion.

Technical results are achieved by the fact that the anamorphic reading system of papillary drawings of the extreme phalanges of the fingers contains a radiation source, an optical system including, among other things, an optical element for applying a surface with a papillary pattern, and a multi-element photodetector located in the housing, one of the surfaces of the optical element is made reflecting spherical convex outward, correcting perspective or trapezoidal distortions of the surface with a papillary pattern applied to the working surface optical element, the optical element is made of a substance with a refractive index in the range from 1.2 to 1.8 with a dihedral angle in the range from 60 ° to 87 ° between the working surface of the optical element and the plane passing through at least part of the contour the reflecting surface of the optical element, between the working and refracting faces in the range from 81 ° to 109 °, the multi-element photodetector is connected to the controller and tilted to the optical axis, forming an optical dihedral angle between the multi-element photodetector and ref with the defining face of the optical element in the range of angles from 1 ° to 29 °, the radiation source is made in the form that allows to obtain illumination of the working face close to uniform, software-hardware-controlled, the optical system includes an additional at least one hardware-software a controlled radiation source, and the direction of radiation reflected from the applied extreme phalanx of the finger with a papillary pattern from an additional radiation source or from a radiation source into the optical element allows to obtain projections, when passing through an optical system with distortions eliminated, onto a multi-element photodetector of places of direct contact of papillary lines with the working face of the optical element, causing a greater intensity of the electrical signal at the corresponding elements of the multi-element photodetector compared to places free of direct contact, and the optical system includes aperture lens. In this case, anamorphization is performed in only one direction, and the anamorphic coefficient lies in the range from 1.3 to 1.7, source

radiation is located on the side of the opposite working face of the optical element, at a distance from 1/3 inclusive to 1/2 exclusively the length of the face opposite the working face of the optical element, additional radiation sources are located in such a way that they illuminate the two angular regions of the working face of the optical element from the side from 2/3 inclusive to 1/2 exclusively the length of the face to the radiation source, the opposite working face of the optical element, and emit in the wavelength range from 0.8 μm to 0.9 microns and monochromatized with a radiation source.

The term “working face” of an optical element should be understood as the face to which a surface with a papillary pattern of the extreme phalanx of the fingers is applied.

The term "refracting face" of a reflective prism should be understood as the face to which the objective of the optical system is directed.

Monochromatization of radiation sources reduces polychromatic distortion and allows the use of a single-lens instead of a multi-lens while ensuring the same image quality, which affects the overall cost of the device.

An anamorphic reading system of papillary patterns can be performed with the location of additional radiation sources from the side opposite the working face of the optical element. This implementation of the system allows to improve the quality of the source data entering the personality identification system by increasing the uniformity of illumination of the working face.

Anamorphic reading system of papillary patterns can be performed with the location of additional radiation sources from the sides adjacent to the working face of the optical element. This implementation of the system allows to improve the quality of the source data entering the personality identification system by increasing the uniformity of illumination of the working face.

An anamorphic reading system for papillary patterns can be performed with monochromatization of additional radiation sources with a radiation source by selection according to the radiation characteristics by wavelengths. This embodiment of the system allows

to improve the quality of the source data entering the personality identification system by reducing polychromatic distortions.

An anamorphic reading system for papillary patterns can be performed with a multi-element photodetector containing microlenses for each element. This embodiment of the system allows to improve the quality of the initial data entering the personality identification system by focusing the image parts on the working parts of the photocells of the multi-element photodetector.

An anamorphic reading system for papillary drawings may contain an optical axis that changes its direction, for example, by mirrors or prisms. This embodiment of the system allows to increase its compactness by reducing the distance between the optical element and the multi-element photodetector.

An anamorphic reading system for papillary drawings may contain an immersion lens. This embodiment of the system allows to increase its compactness by reducing the distance between the reflective prism and a multi-element photodetector.

The lens may contain at least one, for example, an aspherical lens. This embodiment of the lens allows you to get the desired undistorted image of the papillary pattern of the extreme phalanx of the finger.

The lens may contain a remote aperture diaphragm. This embodiment of the lens improves the image quality of the papillary pattern of the extreme phalanx of the finger.

A multi-element photodetector of an anamorphic papillary pattern reading system can be made in the form of a CCD matrix (charge-coupled device) or a CMOS structure (silicon-metal-oxide-semiconductor).

The method of using the anamorphic system is that they use the standby modes for contacting the surface of the papillary pattern of the extreme phalanx of the finger with the working surface of the optical element and analyzing the surface applied to the working surface of the optical element, setting up rational illumination of the working surface of the optical element,

settings of rational contrast of the optical system, additional analysis of the surface applied to the working surface of the optical element and transmission of the digitized image of the papillary pattern of the extreme phalanx of the finger to the computer memory or storage medium if the criterion of conformity of the surface applied to the working surface of the optical element with the papillary pattern of the extreme phalanx of the finger papillary patterns with features inherent to the applied surfaces in which the source radiation and additional radiation sources are activated periodically with periods close to those necessary for sequentially carrying out the radiation stages by the source and additional sources until the maximum possible change in the electrical parameters is accumulated when the lighting conditions of the element change from complete absence to maximum illumination acting on the element for a duration guaranteeing the end of transients at least on one element of a multi-element photodetector ka, setting rational working surface illumination optical element, configuration rational contrast, additional surface analysis applied to the working surface of the optical element and transmitting the digitized image papillary pattern at phalanx in computer memory or on a recording medium. During the stage of waiting for the contact surface of the papillary pattern of the extreme phalanx of the finger with the working surface of the optical element and the analysis of the surface applied to the working surface of the optical element, the changes in the electrical parameters generated by the radiation in the optical system are taken into account linearly, taking into account the discreteness of the elements of the multi-element photodetector, and the source is activated radiation and additional radiation sources of initial duration, which is part of the total duration, necessary to obtain the maximum possible change in the electrical parameter when changing the lighting conditions of the element from complete absence to maximum illumination, acting on the element for a duration that guarantees the end of transient processes, at least

one of the elements of a multi-element photodetector and summarize proportionally increased or decreased, for example, according to a power law, the difference in the values of changes in electrical parameters in neighboring linearly arranged elements of a multi-element photodetector, activate the radiation source and additional radiation sources with a shorter duration, which is part of the initial duration, and summarize the proportionally increased or reduced, for example, according to a power law, the difference in the values of changes in the electric parameters in neighboring linearly arranged elements of a multi-element photodetector and compare the obtained values with a criterion proportionally increased or decreased, for example, according to a power law, the difference in the values of changes in electrical parameters in neighboring linearly arranged elements of a multi-element photodetector, determined empirically for surfaces with a papillary pattern of the extreme phalanxes of the fingers , and, if the conditions of comparison are satisfied, they proceed to the stages of rational tuning the illumination of the working surface of the optical element and adjusting the rational contrast of the anamorphic system for additional analysis of the surface applied to the working surface of the optical element, and in case of unsatisfaction continue to use the standby mode of contact of the surface of the papillary pattern of the extreme phalange of the finger with the working surface of the optical element and analysis of the surface applied to the working surface of the optical element. During the stage of adjusting the rational illumination of the working surface of the optical element, the radiation source and additional radiation sources are activated with a partial duration that is part of the total duration necessary to obtain the maximum possible change in the electrical parameter when changing the illumination conditions of the element from complete absence to maximum illumination acting on the element with a duration of guaranteeing the end of transients on the elements of a multi-element photodetector emnika which discretely increased to achieve full length, and during the activation, or being in the active state of the radiation source and additional

radiation sources summarize the values of changes in the electrical parameters of linearly arranged elements of a multi-element photodetector with the magnitude of these parameters exceeding 80% of the maximum possible change in the electrical parameter when changing the lighting conditions of the element from complete absence to maximum illumination, affecting the element with a duration guaranteeing the end of transient processes, and save the values sums and corresponding values of partial duration, both at the radiation source and at additional radiation sources, upon reaching the full duration, select the value of the partial duration, which ensures rational illumination of the working surface of the optical element. During the stage of adjusting the rational contrast of the optical system, the radiation source and additional radiation sources are activated with a partial duration, which is part of the total duration necessary to obtain the maximum possible change in the electrical parameter when changing the lighting conditions of the element from complete absence to maximum illumination, affecting the element with a duration guaranteeing the end transients at least on one of the elements of a multi-element phot receiver, which is discretely increased until the full duration is reached, and while the radiation source and additional radiation sources are activated or in an active state, the values of changes in the electrical parameters of the linearly arranged elements of the multi-element photodetector are summed up with the value of these parameters exceeding 80% of the maximum possible change in the electrical parameter when changing lighting conditions of the element from complete absence to maximum illumination acting on the element Call duration guaranteeing termination transients, and stored value of the sum values and the corresponding partial duration to achieve complete duration selected partial duration value, at which the contrast is provided a rational optical system; during the stage of additional analysis of the surface applied to the working surface of the optical element activate the source

radiation duration, providing a rational contrast of the optical system in the range from 0.8 μm to 0.9 μm, activate the transmission mode of the digitized image of the papillary pattern of the extreme phalanx of the finger in the computer memory or on the storage medium in the process of which take into account changes in the electrical parameters of each element of the multi-element photodetector, generated by radiation in the optical system.

One of the possible applications of a multi-element photodetector to solve the problems of the proposed utility model is to use semiconductor sensors, the elements of which, during operation, are supplied with a blocking voltage, and when illuminated, the current in the element circuit increases due to a decrease in resistance due to the formation of charge carriers. Measurements of changes in electrical parameters automate the recognition of papillary patterns.

In the method of using the anamorphic system, a proportional increase or decrease in the difference in the values of changes in the electrical parameters in neighboring linearly arranged elements of the multi-element photodetector can be performed according to the quadratic law.

In the method of using the anamorphic system, a multi-element photodetector can be controlled by a computer.

In the method of using the anamorphic system, a multi-element photodetector can be controlled by a microprocessor.

Information confirming the feasibility of implementing a utility model

The possibility of practical implementation of the utility model is illustrated by drawings and examples of actions that make up the elements of the papillary pattern recognition method.

Figure 1 presents a diagram of anamorphic system.

Figure 2 presents the spatial diagram of the anamorphic system with refracted mirrors by the optical axis and the location of the multi-element photodetector in the plane of the circuit board.

Figure 3 presents a spatial diagram of the change in illumination depending on the distance from the radiation source to the working surface when placing the latter near the center of the face, the opposite working face of the optical element (size 18x24 mm).

Figure 4 presents the spatial diagram of the change (compared with figure 3) when the radiation source is displaced to 1/3 of the length from the edge of the face, the opposite working face of the optical element.

Figure 5 presents the options for accounting for the generated radiation in the optical system of electrical parameters linearly, taking into account the discreteness of the elements of the multi-element photodetector: 5a, 5b - axial; 5c, 5d - parallel to the axes; 5d - inclined; 5e - diagonally, 5g - spline; 5c - along a fragment of a circle.

Figure 6 presents a diagram of the activation of an additional radiation source in standby mode of contact of the surface of the papillary pattern with the working surface of the optical element and analysis of the surface applied to the working surface of the optical element.

Figure 7 presents a diagram of the activation of radiation sources in the setting mode of rational illumination and rational contrast of the optical system.

The diagrams in Fig.6, Fig.7 are presented without detailing the transients when the radiation source is turned on and off with the conditional image of the gaps during which the changes in the electrical parameters of the elements of the multi-element photodetector generated by the radiation in the optical system are taken into account.

The anamorphic reading system of papillary patterns contains a radiation source 1, an optical system including a lens 2 with an aperture diaphragm 3 and an optical element 4 for applying a surface with a papillary pattern in the extreme phalanx of finger 5, and a multi-element photodetector 6. Optical element 4, with dihedral angles 7 and 8 between the working surface 9 of the optical element and the plane passing through at least

a part of the contour of the reflecting surface 10 of the optical element 4, between the working 9 and the refracting surfaces 11, respectively, the multi-element photodetector 6 is connected to the controller 12 and inclined to the optical axis 13, forming an optical dihedral angle 14 between the multi-element photodetector 6 and the refractive face 11 of the optical element 4. Anamorphic the papillary pattern reading system also contains additional radiation sources 15. The optical system may include refracting the optical axis 13 of the mirror 16.

When the radiation source and additional radiation sources work together, the uniformity of illumination of the working face of the optical element increases.

The manufacture of the optical element can be carried out by known methods from materials used in optics, for example, from glass and by spraying on the reflective surface of the optical element of the reflective layer, for example, from metal.

The manufacture of the remaining elements of the system can be carried out by known methods.

The way to use the anamorphic system is as follows.

Use the standby mode of contact of the surface of the papillary pattern 5 with the working surface 9 of the optical element 4 and analysis of the surface applied to the working 9 surface of the optical element 4, while activating an additional radiation source 14 periodically software and hardware with a period of duration T (see Fig.6) close to that which is necessary for sequentially carrying out the radiation stages by an additional source 15 until the maximum charge value is accumulated on at least one element of a multi-element photodetector, rational contrast settings, additional analysis of the surface applied to the working surface of the optical element and transmission of the digitized image of the papillary pattern to the computer memory or to the storage medium.

During activation of the additional radiation source 14, the electrical parameters generated by the radiation in the optical system are taken into account linearly (lines are indicated by 17 on

5), taking into account the discreteness of the elements of the multi-element photodetector 6, an additional radiation source 15 is activated with an initial duration of T2, which is part of the total duration of T1, necessary to obtain the maximum possible change in electrical parameters when the lighting conditions of the element change from complete absence to maximum illumination acting on an element with a duration guaranteeing the end of transient processes in at least one of the elements ohm photodetector 6 and summarize proportionally increased or decreased, for example, according to a power law, the difference in the values of changes in electrical parameters in adjacent linearly arranged 17 elements of a multi-element photodetector, activate an additional radiation source 15 with a shortened duration T3, which is part of the initial duration T2, and summarized proportionally increased or reduced, for example, according to a power law, the difference in the values of changes in electrical parameters in neighboring linearly 17 ennyh elements of multielement photodetector 6 and the values obtained are compared with the criterion value proportionally enlarged or reduced, e.g., by a power law, the difference value changes in the electrical parameters of adjacent linear elements 17 arranged multielement photodetector.

When the surface of the papillary pattern is in contact with the working surface of the optical element, the rational contrast and rational illumination settings of the optical system are used. In this case, an additional radiation source 15 or radiation source 1 is activated with a partial duration T4, which is part of the total duration T1, which is discretely increased until the full duration T1 is reached (see Fig. 7). For an additional radiation source 15 or radiation source 1, the duration of the periods of their activation to ensure rational contrast may be different.

During the stage of additional analysis of the surface applied to the working surface of the optical element, the radiation source 1 is activated with a duration of rational contrast and

rational illumination of the optical system, activate the mode of transmitting the digitized image of the papillary pattern in the computer memory or on the storage medium in the process of which take into account changes in the electrical parameters of each element of the multi-element photodetector generated by radiation in the optical system.

In the method of using the anamorphic system, a proportional increase or decrease in the difference in the values of changes in electrical parameters in neighboring linearly arranged elements of the multi-element photodetector 6 can be carried out according to a quadratic law.

In the method of using the anamorphic system, a multi-element photodetector 6 can be controlled by a computer.

In the method of using the anamorphic system, a multi-element photodetector 6 can be controlled by a microprocessor.

Thus, the use of system data and the method of its use allows to improve the quality of the initial data entering the personality identification system, the contrast of various images of papillary drawings of the extreme phalanges of the fingers and the reliability of recognition of papillary drawings of the extreme phalanges of the fingers; reduce polychromatic distortion and system cost.

Claims (13)

1. Anamorphic reading system of papillary drawings of the extreme phalanges of the fingers, containing a radiation source, an optical system including including an optical element for applying a surface with a papillary pattern and a multi-element photodetector located in the housing, one of the surfaces of the optical element is made reflecting spherical convex outward, correcting perspective or trapezoidal distortions of the surface with a papillary pattern applied to the working surface of the optical element, optical element Theent is made of a substance with a refractive index in the range from 1.2 to 1.8 with a dihedral angle in the range from 60 to 87 ° between the working surface of the optical element and the plane passing through at least part of the contour of the reflecting surface of the optical element between the working and refracting faces in the range from 81 to 109 °, the multi-element photodetector is connected to the controller and tilted to the optical axis, forming an optical dihedral angle between the multi-element photodetector and the refracting face of the optical element in the range the angles are from 1 to 29 °, the radiation source is made in a form that makes it possible to obtain illumination of the working face close to uniform, the optical system includes an additional at least one software-hardware-controlled radiation source, and the direction of the radiation reflected from the applied extreme phalanges of a finger with a papillary pattern from an additional radiation source or from a radiation source into an optical element, allows to obtain projections when passing through an optical system with eliminated distortions to a multi-element photodetector of places of direct contact of papillary lines with the working face of the optical element, causing a greater intensity of the electrical signal at the corresponding elements of the multi-element photodetector compared to places free of direct contact, and the optical system includes a lens with an aperture diaphragm, characterized in that anamorphic is performed only in one direction, and the anamorphic coefficient lies in the range from 1.3 to 1.7, the radiation source position is located on the side of the side opposite the working face of the optical element, at a distance from 1/3 inclusive to 1/2 exclusively the length of the face opposite the working face of the optical element, additional radiation sources are located in such a way that they illuminate the two angular regions of the working face of the optical element from 2/3 inclusive to 1/2 exclusively the length of the face to the radiation source, the opposite working face of the optical element, and emit in the wavelength range from 0.8 to 0.9 μm and m onochromatized with a radiation source. 2. Anamorphic system according to claim 1, characterized in that the additional radiation sources are located on the side of the opposite working face of the optical element. 3. Anamorphic system according to claim 1, characterized in that the additional radiation sources are located on the side of the faces adjacent to the working face of the optical element. 4. Anamorphic system according to claim 1, characterized in that the additional radiation sources are monochromatized with the radiation source by selection according to the radiation characteristics by wavelengths. 5. Anamorphic system according to claim 1, characterized in that the multi-element photodetector is made with microlenses for each element. 6. Anamorphic reading system for papillary drawings according to any one of claims 1 to 5, characterized in that in the optical system the optical axis can change direction. 7. Anamorphic reading system for papillary drawings according to any one of claims 1 to 5, characterized in that the direction of the light beam in the optical system is changed by at least one mirror. 8. Anamorphic reading system of papillary drawings according to any one of claims 1 to 5, characterized in that the direction of the light beam in the optical system is changed by at least one reflective prism. 9. Anamorphic reading system of papillary drawings according to any one of claims 1 to 5, characterized in that the lens is immersion. 10. Anamorphic reading system for papillary drawings according to any one of claims 1 to 5, characterized in that the lens contains an aspherical lens. 11. Anamorphic reading system for papillary drawings according to any one of claims 1 to 5, characterized in that the aperture diaphragm is remote. 12. Anamorphic reading system for papillary drawings according to any one of claims 1 to 5, characterized in that the multi-element photodetector is made in the form of a CCD matrix. 13. Anamorphic reading system for papillary drawings according to any one of claims 1 to 5, characterized in that the multi-element photodetector is made in the form of a CMOS structure.