DE102014112494A1 - Apparatus for detecting biometric features of a person's face - Google Patents

Abstract

The invention relates to a device (100) for detecting biometric features of a face (104) of a person (102), wherein the device (100) is designed for vertical positioning for detecting the biometric features, wherein the device (100) comprises a camera (110 ) for detecting the biometric features and a semi-transparent mirror (106), wherein the semi-transparent mirror (106) between the person (102) and the camera (110) is arranged and oriented so that on the person ( 102) facing side of the semi-transparent mirror (106) of the beam path of light incident on the semi-transparent mirror (106) is parallel to the beam path of the semi-transparent mirror (106) back reflecting part of this light, wherein the device (100 ) further comprises a control unit (112) for the person (102), wherein the control unit (112) together with the camera (110) and a deflection mirror (108) of the device (100) by the Pers is adjustable in height in the vertical direction (116), wherein the deflecting mirror (108) is arranged on the side of the semi-transparent mirror (106) facing away from the person (102) in such a way that the deflecting mirror (108) falling portion of the light transmitted through the semi-transparent mirror (106) is directed via the deflection mirror (108) into the camera (110), wherein the camera (110), the semi-transparent mirror (106) and the deflection mirror (108) regardless of the height adjustability of the operating unit (112) have a fixed distance from the operating unit (112).

Description

The invention relates to a device for detecting biometric features of a person's face.

Various data acquisition systems for detecting biometric features of a person's face are known in the art. ISO 19794-5 makes different demands on the facial images to be captured. It follows, for example, that for good results of biometric comparison algorithms for face and iris, the corresponding camera shots should be as frontal as possible.

The DE 10 2011 079 285 discloses a device for detecting biometric features.

The invention has for its object to provide an improved device for detecting biometric features of a person's face, an improved method and an improved computer program product. The objects underlying the invention are achieved by the features of the independent claims. Preferred embodiments of the invention are indicated in the dependent claims.

The invention relates to a device for detecting biometric features of a person's face, wherein the device is designed for vertical positioning for detecting the biometric features, wherein the device comprises a camera for detecting the biometric features and a semitransparent mirror, wherein the semitransparent mirror between the Person and the camera is arranged and oriented so that on the person facing side of the semitransparent mirror of the beam path of incident on the semitransparent mirror light is parallel to the beam path of the back-reflected from the semitransparent mirror part of this light. The device furthermore has an operating unit for the person, wherein the operating unit is simultaneously height-adjustable by the person in the vertical direction together with the camera and a deflecting mirror of the apparatus, wherein the deflecting mirror is arranged on the side of the semitransparent mirror facing away from the person in that the part of the light transmitted through the semitransparent mirror and incident on the deflecting mirror is directed via the deflecting mirror into the camera, wherein the camera, the semitransparent mirror and the deflecting mirror move independently of the height adjustability of the operating unit at a fixed distance from the operating unit Direction.

Embodiments of the invention could have the advantage that the number of mirrors used could be reduced to a minimum. In addition, the apparatus could have the advantage that, despite minimizing the length of the optical path of the light from the person's face to the camera, the person's facial images taken by the camera are of high quality, in particular according to the specifications of ISO 19794-5 , to have. The invention is based on the recognition that the distance of the person from the semi-transparent mirror is usually in the range of an arm's length, since the person will operate the operating unit. Since, therefore, the distance of the person with the arm length is little variable, the invention recognizes that it is sufficient if the beam path is folded in particular only once. By fixedly setting the distance between the camera, deflecting mirror and semi-transparent mirror, an optimum recording distance in the range of 150 cm optical path length could thus be achieved for all persons regardless of their size when using lightweight telephoto lenses.

Further, embodiments of the invention could have the advantage of taking a biometric facial image or iris image through the semitransparent mirror so that the correct positioning of the head is accomplished simply by seeing the person, that is, their mirror image, in the eye. In this way, a mechanical method of the camera could be limited to placing the person's face as centrally as possible in the image-capturing field of the camera only in the vertical direction. As a result, a corresponding device could be produced inexpensively, and yet a high-quality image of a good image can be achieved, which enables proper recognition performance and analysis of biometric features in an automatic facial recognition system. Biometric features include, for example, the person's iris, retina, or facial biometrics.

In the context of the present description, a semitransparent mirror is understood to mean an optical component, such as a mirrored glass plate, which only partially reflects incident light and transmits part of the incident light. In the embodiment of the invention, the optical path of the portion of the light reflected in front of the deflection mirror extends exclusively in the vertical direction of the device. This would make it possible to work with exactly two mirrors, namely the semi-transparent mirror and the deflecting mirror. A mechanical individual adjustment of camera, deflecting or semi-transparent mirrors could be omitted here, so that only care would have to be taken, that camera, semi-transparent mirror and deflection mirror are fixedly fixed to a displacement element of the device. By displacement of the displacement element is simultaneously a method of all three components, so that the mechanical structure of the device could be simplified and thus the mechanical durability of the device could be increased.

According to one embodiment of the invention, the operating unit has an operating element, wherein the device is designed to perform a triggering of a capture of the facial image of the person by the camera for detecting the biometric features exclusively upon detection of an actuation of the operating element. In other words, a triggering of the recording will take place exclusively while the person operates the operating element. For example, the operating element could be a button or a sensor field of the operating unit. This feature could ensure that the person is within the distance of an arm's length from the device, so that the distance between the device and thus the semi-transparent mirror and the person is substantially predefined.

According to one embodiment of the invention, the device further comprises a quality detection unit, wherein the quality detection unit is adapted to analyze the detected by the camera facial image of the person according to predefined quality criteria, wherein the device is adapted, in the case of the invention, a predefined minimum quality of the facial image with respect to the biometric features to perform an automatic triggering of a recording of the person's facial image by the camera to capture the biometric features. This could speed up and simplify the capture of biometric features, as the person only has to view their own facial image in the semi-transparent mirror and change their facial posture and facial expressions until the device automatically initiates capture of the person's facial image by the camera.

According to one embodiment of the invention, the device further comprises a drive and an evaluation unit, wherein the drive for vertical adjustment of the position of the control unit is formed, wherein the evaluation unit is adapted to the detected by the camera face image of the person with respect to its vertical positioning relative to the To evaluate semitransparent mirror and independently to drive the drive for a correction of the positioning to obtain a predefined positioning of the facial image.

This could have the advantage that the device automatically performs the optimal positioning of the semitransparent mirror and thus the camera and the deflection mirror, so that there is no possibility of incorrect operation by the person. For example, the evaluation unit could attempt to correct the position of the operating unit and thus the position of the semitransparent mirror in such a way that the face image of the person results centered on the semitransparent mirror.

According to one embodiment of the invention, the device has a base, wherein the receiving direction of the camera is remote from the stand. This could have the advantage that the device can be made compact, since a part of the device, which is anyway necessary for the mechanical construction of the device, is used for positioning the camera in the device. The camera thus has in this embodiment, from bottom to top and can be accommodated in the connection area between the control unit and stand in the correspondingly used for this connection element of the device. In the context of the description, a stand is understood to mean any element which, with regard to the device, ensures that the device can be set up directly on the floor.

According to one embodiment of the invention, the operating unit has an input area for input of first person-specific data of the person. For example, the person-specific data of the person include a signature of the person.

The personal data may further include an address as well as dates of birth and birth, and so on.

According to one embodiment of the invention, the operating unit further comprises a reading device for an identity document, wherein the reading device is designed to detect second person-specific data stored in the identification document, the device being designed to display the second person-specific data of the person and via the operating unit to receive a confirmation or change of the second person-specific data of the person. The display can be done via the control unit itself, for example, by the operating unit is designed as a touch screen. Alternatively, it might be possible to display, for example, the second person-specific data in the semitransparent mirror. For this purpose, a projection of the data in the semitransparent mirror could be used. Said embodiments could have the advantage that the device could be used in particular as a "self service terminal". In such a self-service terminal recording could Person-specific, in particular biometric data for the application of identity documents by the customer itself, that is, the person to be enabled. For this purpose, the person would only have to legitimize himself to the device by presenting the said passport, in order subsequently to experience a comfortable and efficient data entry, including the acquisition of facial images, via a transparent, easily understandable user guidance.

According to one embodiment of the invention, the device is thus a self-service terminal.

According to one embodiment of the invention, the length of the beam path between the semitransparent mirror and the camera is constantly between 80 to 120 cm. This could allow the use of lightweight telephoto lenses in the camera, equivalent to a small screen equivalent of about 80 mm. This could optimally meet the requirements of ISO 19794-5 Are worn enough, as far as the quality of the face image acquisition is concerned.

According to a further embodiment of the invention, the device further comprises a distance measuring unit, wherein the distance measuring unit is adapted to determine the distance of the person from the semitransparent mirror, wherein the device is adapted exclusively to trigger a recording of the person's facial image by the camera to record the biometric features if the person's distance is in a predefined range. This could ensure that the quality of the captured facial images is sufficiently high to meet the requirements of the ISO 19794-5 to suffice.

The distance determination by the distance measuring unit could be made on the basis of data which were acquired in the form of facial image data by the camera. The size of the detected face could be a measure of the distance of the person from the device. It is also possible to use distance sensors that work on an infrared or ultrasound basis. The distance measurement unit could thus access these distance sensors to determine the distance of the persons from the semitransparent mirror.

• – Empfang eines Befehls zur Erfassung eines Gesichtsbilds der Person,
• – daraufhin Erfassung des Gesichtsbildes der Person durch die Kamera.

In a further aspect, the invention relates to a method for detecting biometric features of a person's face by means of a device as described above, the method performed by the device comprising:

• Receiving a command to capture a facial image of the person
• - Then capturing the facial image of the person through the camera.

The command can either be triggered automatically, for example by the quality detection unit described above. However, it is also possible that the person himself initiates the triggering of the camera by pressing a specific control knob or the operation of the control knob is a prerequisite for the automatic triggering of the camera.

In a further aspect, the invention relates to a computer program product having processor executable instructions for performing the steps of the method described above.

It should be noted that the above-described embodiments of the invention may be combined with each other in an arbitrary manner as long as the combined embodiments are not mutually exclusive.

Embodiments of the invention will be explained in more detail below with reference to the drawings. Show it:

1 a schematic view of a device for detecting biometric features of a face of a person

2 a schematic view of a control unit,

3 a flowchart of a method for detecting biometric features of a person's face.

Hereinafter, similar elements will be denoted by like reference numerals.

The 1 shows a device 100 which captures biometric features of a face 104 one person 102 serves. The device 100 is designed for vertical placement, which means she is using her foot 114 standing on the ground and over a stiffening element 101 has, which extends in the vertical direction, that is perpendicular to the ground.

At the stiffening element 101 is in the vertical direction, ie direction 116 displaceable, a housing "sliding element" arranged. This case is in the 1 only shown schematically and with reference numerals 103 characterized. It is further provided that an operating unit 112 , a camera 110 , a deflecting mirror 108 and a semitransparent mirror 106 together over a mechanics together simultaneously in the vertical direction 116 are displaceable. In the embodiment of the 1 This was done by using the case 103 However, other possibilities are known to the person skilled in the art to couple the said various elements mechanically to one another so far that these together in the vertical direction 116 are displaceable.

The semitransparent mirror 106 is between the person 102 and the deflecting mirror 108 arranged and the deflecting mirror in turn is on the person 102 opposite side of the semitransparent mirror 106 arranged so that the falling on the deflecting mirror and through the semitransparent mirror 106 transmitted part of the light over the deflection mirror in the camera 110 is steered. Expressed in reverse, so the camera shows 110 from bottom to top on the deflection mirror 108 and looks through the semitransparent mirror 106 through the face 104 the person 102 ,

The person 102 sees her own face again 104 on the semitransparent mirror 106 reflected.

Without limitation of generality, it is the device 100 to a self-service terminal, where the user 102 after entering person-specific data via the operating unit 112 a facial image capture of his face 104 can trigger. The whole can serve that the data thus collected are transmitted to a passport, so that they can generate from the face image and the person-specific data, a passport document, for example, a passport or a personal ID card or driver's license, in a known manner.

The operating unit is used to enter the person-specific data 112 , which schematically in the 2 is shown. For example, the operating unit 112 a keyboard 200 on as well as a means of display 204 for example, instructions for the person 102 or person-specific data of the person already known to the device 102 display. For example, it is the control unit 112 around a touch screen, so a touch-sensitive screen, in which case the keyboard 200 is merely a keyboard displayed to the user on the touch screen.

Furthermore, the operating unit can be either on the touch screen itself or separately, a control element 202 for the user.

In the following, the operation of the device and the processes taking place in the device will be described with reference to the flowchart of FIG 3 explained in more detail.

For example, the person enters 102 to the device 100 and is via the control unit 112 to an existing ID card one in the 1 not shown in more detail reader. The reader can, for example, optically by scanning the existing identity document or by near-field communication with the identity document stored there person-specific data of the person 102 read. In step 300 Then, on the touch screen display, the user is presented with the current contents of the identification document and the person is given the opportunity to correct and adapt the displayed data. About the keyboard 200 can then the person 102 make the appropriate corrections. Upon completion of the input, the user could also be prompted via the touchscreen display to look into the semi-transparent mirror 106 to judge, so that the device 100 a facial image of the face 104 the person 102 can make automatically.

To now the camera and thus the deflection mirror 108 and the semitransparent mirror 106 optimal to the face 104 to position the person registered in step 302 the camera 110 one or more facial images of the face 104 , The device has a control unit 118 which, for example, a microprocessor control of the device 100 allows. This control unit 118 For example, it has an evaluation unit which is capable of passing through the camera 110 to evaluate currently recorded facial image of the person and then the mechanics 103 to control that camera 110 , Deflection mirror 108 , semitransparent mirror 106 and control unit 112 together in the vertical direction 116 be moved. The procedure takes place so far that the face 104 optimal from the camera 110 can be detected. For example, then the face 104 vertically centered in the semitransparent mirror 106 for the person 102 self-visible.

This step of optimizing the vertical position of the semitransparent mirror 106 is not mandatory at the conclusion of entering or correcting the person-specific data in step 300 bound. This step 302 the procedure of the entire mechanics can also be the step 300 be upstream, so already with the approach of the person to the device 100 the device automatically performs a vertical positioning of the mechanism such that the person 102 convenient the operating unit 112 Can operate with their hands.

After completing the optimized positioning of the mechanism 103 and thus especially the camera 110 , the deflecting mirror 108 and of semitransparent mirror 106 takes place in an optional step by the control unit 118 a fully automatic quality control of the camera now 110 captured facial image. The control unit has this feature 118 further comprising a quality detection unit adapted to receive the from the camera 110 captured facial image of the person according to predefined quality criteria. For example, the facial expressions of the face 104 the person 102 analyzed, because not every facial expression is permissible as a "Personalausweisauglich". As soon as the quality detection unit determines that the predefined minimum quality of the facial image is fulfilled, it can in step 304 to automatically trigger a capture of the person's facial image by the camera to capture the biometric features.

Preferably, however, it is the case that the operating unit 112 for triggering the recording of the facial image on a detection of an operation of the operating element 202 by the person 102 waiting. Only if, for example, the person 102 a finger on the control 202 The device may be assured that the person is in a predefined distance window from the semitransparent mirror 106 located. Since the arm's length of man varies within known limits, this can be based on a distance of the person to the semitransparent mirror 106 be closed from 50 to 70 cm. Based on this assumption, the arrangement of deflecting mirror 108 and camera 110 relative to the control unit 112 already in the manufacturing process of the device 100 be set so constant that the total length of the beam path from face to camera is about 150 cm. This is independent of the size of the person 102 essentially always the same shooting distance for the camera 110 guaranteed.

The control unit 118 Thus, it may be able to perform a triggering of the recording of the facial image only when, on the one hand, the person actuates the operating element and at the same time the above mentioned quality criteria are met.

As an alternative to using the operating element, a distance sensor could also be used which detects the distance of the person from the semitransparent mirror. As soon as the distance is within predefined limits and, moreover, the quality detection unit detects the fulfillment of the predefined minimum quality of the facial image, an automatic triggering operation of the camera for taking the facial image could also take place.

After that in this way both the current person-specific data of the person on the control unit, as well as the current facial image of the person on the camera 110 can be captured in the final step 306 the person-specific data collected in this way are transmitted electronically to a passport or identification office in order to be further processed there in a suitable manner.

In summary, the device could 100 allow, with high comfort for one person 102 allow the inclusion of a facial image of the person. When operating the device 100 by the person 102 In this same position, both the person-specific data of the person are recorded and the person's facial image is recorded. The distance of the person to the device is little variable with arm length and the height of the semitransparent mirror 106 adapts to the user together with camera and operating unit.

This could on the one hand a convenient operation of the control unit 112 On the other hand, the picture of the facial image could take place at the optimum height. Despite the great closeness of the person to the device 100 It may be possible to take a facial image of the person from a distance of about 150 cm. This is achieved by folding the beam path once. The camera looks vertically upwards, but a different angle is possible as long as the camera looks upwards and the system remains compact. At the head of the device is the deflection mirror 108 that folds the beam once so that the front of the device 100 standing and exactly straight forward looking person 102 frontal, ie horizontal, is recorded. In this way, at a distance of the person to the device of 50 to 70 cm, a length of the beam path of about 120 cm could be ensured.

Despite ergonomic proximity of the person to the device 100 facial images could be recorded as it is from the specifications of the ISO 19794-5 equivalent. In addition, according to the principle described, the device 100 be compact built as compared to a device with non-folded beam path in the ISO 19794-5 recommended lighting elements (35 ° up and right and 35 ° up and left) at a short distance not as far as unloading at 150 cm distance. This could make it possible to follow the ISO recommendations while avoiding polarizing filters. This could lead to a reduction or elimination of mirrors and other reflections, better contrasts, more uniform illumination, and more texture in the image.

LIST OF REFERENCE NUMBERS

100

contraption

101

stiffener

102

person

103

casing

104

face

106

semitransparent mirror

108

deflecting

110

camera

112

operating unit

114

stand

116

vertical direction

118

control unit

200

keyboard

202

operating element

204

display

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102011079285 [0003]

Cited non-patent literature

• ISO 19794-5 [0002]
• ISO 19794-5 [0006]
• ISO 19794-5 [0018]
• ISO 19794-5 [0019]
• ISO 19794-5 [0048]
• ISO 19794-5 [0048]

Claims (14)

Contraption ( 100 ) for detecting biometric features of a face ( 104 ) one person ( 102 ), the device ( 100 ) is designed for vertical positioning for detecting the biometric features, wherein the device ( 100 ) a camera ( 110 ) for the collection of biometric features and a semi-transparent mirror ( 106 ), wherein the semi-transparent mirror ( 106 ) between the person ( 102 ) and the camera ( 110 ) is arranged and oriented so that on the person ( 102 ) facing side of the semi-transparent mirror ( 106 ) the beam path from to the semi-transparent mirror ( 106 ) incident light is parallel to the beam path of the semi-transparent mirror ( 106 ) reflect back part of this light, the device ( 100 ) a control unit ( 112 ) for the person ( 102 ), wherein the operating unit ( 112 ) together with the camera ( 110 ) and a deflection mirror ( 108 ) of the device ( 100 ) by the person ( 102 ) in the vertical direction ( 116 ) is height-adjustable, wherein the deflection mirror ( 108 ) on the person's ( 102 ) facing away from the semi-transparent mirror ( 106 ) is arranged so that the on the deflection mirror ( 108 ) falling through the semi-transparent mirror ( 106 ) transmitted part of the light over the deflection mirror ( 108 ) into the camera ( 110 ), whereby the camera ( 110 ), the semi-transparent mirror ( 106 ) and the deflection mirror ( 108 ) regardless of the height adjustability of the operating unit ( 112 ) a fixed distance from the control unit ( 112 ) exhibit. Contraption ( 100 ) according to claim 1, wherein the optical path of the deflecting mirror ( 108 ) into the camera ( 110 ) reflected part of the light exclusively in the vertical direction ( 116 ) of the device ( 100 ) runs. Contraption ( 100 ) according to one of the preceding claims, wherein the operating unit ( 112 ) an operating element ( 202 ), the device ( 100 ) is designed exclusively for detecting an actuation of the operating element ( 202 ) triggering a photograph of the person's facial image ( 102 ) through the camera ( 110 ) to record the biometric features. Contraption ( 100 ) according to one of the preceding claims, further comprising a quality detection unit, wherein the quality detection unit is adapted to receive the information from the camera ( 110 ) captured facial image of the person ( 102 ) according to predefined quality criteria, the device ( 100 ) is designed, in the case of the fulfillment of a predefined minimum quality of the facial image, to automatically trigger a recording of the facial image of the person ( 102 ) through the camera ( 110 ) to record the biometric features. Contraption ( 100 ) according to one of the preceding claims, further comprising a drive and an evaluation unit, wherein the drive for vertical adjustment of the position of the operating unit ( 112 ) is formed, wherein the evaluation unit is adapted to the by the camera ( 110 ) captured facial image of the person ( 102 ) with respect to its vertical positioning relative to the semi-transparent mirror ( 106 ) and autonomously drive the drive for a correction of the positioning to obtain a predefined positioning of the facial image. Contraption ( 100 ) according to one of the preceding claims, wherein the device ( 100 ) a stand ( 114 ), wherein the recording direction ( 116 ) the camera ( 110 ) from the pedestal ( 114 ) is turned away. Contraption ( 100 ) according to one of the preceding claims, wherein the operating unit ( 112 ) an input surface ( 200 ) for entering the first person-specific data of the person ( 102 ) having. Contraption ( 100 ) according to claim 8, wherein the first person-specific data is a signature of the person ( 102 ). Contraption ( 100 ) according to one of the preceding claims 7-8, wherein the operating unit ( 112 ) further comprises a reading device for an identity document, wherein the reading device is designed to detect second person-specific data stored in the identity document, wherein the device ( 100 ) is adapted to the second person-specific data of the person ( 102 ) and via the operating unit ( 112 ) a confirmation or modification of the second person-specific data of the person ( 102 ) to recieve. Contraption ( 100 ) according to any one of the preceding claims, wherein the device ( 100 ) is a self-service terminal. Contraption ( 100 ) according to one of the preceding claims, wherein the length of the beam path between the semi-transparent mirror ( 106 ) and the camera ( 110 ) is constant 80-120 cm. Contraption ( 100 ) according to any one of the preceding claims, further comprising a distance measuring unit, wherein the distance measuring unit is adapted to the distance of the person ( 102 ) from the semi-transparent mirror ( 106 ), the device ( 100 ) is designed to trigger a recording of the person's facial image ( 102 ) through the camera ( 110 ) for recording the biometric features perform when the distance of the person ( 102 ) lies in a predefined area. Method for detecting biometric features of a face ( 104 ) one person ( 102 ) by means of a device ( 100 ) according to one of the preceding claims, wherein the device ( 100 ) comprises: - receiving a command to capture a facial image of the person, - then capturing the facial image of the person ( 102 ) through the camera ( 110 ). Computer program product with processor-executable instructions for performing the steps according to the method of claim 13.

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