Authorization carrier reader and access control system for validating access to a restricted area

Abstract

The invention refers to an authorization carrier reader for an access control system (10), the authorization carrier reader (16) being configured to read out a visually recognizable information (30a) on an authorization carrier (30), the authorization carrier reader (16) comprising a base plate (18), and at least three cameras (22) each having a field of view, each camera (22) being configured to image the visually recognizable information (30a) located in the field of view Each camera (22) is positioned protruding from the base plate (18) such that at least a volume portion of the field of view of each camera (22) extends along the base plate (18). The respective fields of view of the at least three cameras (22) overlap in an overlap volume over the base plate (18). The respective fields of view of the at least three cameras (22) are orientated such that at least one of the at least three cameras (22) is capable of imaging the visually recognizable information (30a) when the visually recognizable information (30a) is located in the overlap volume.

Description

[0001] Authorization carrier reader and access control system for validating access to a restricted area

[0002] The present invention relates to an authorization carrier reader for an access control system. The authorization carrier reader is configured to read out a visually recognizable information on an authorization carrier. The authorization carrier reader comprises a base plate and a camera.

[0003] The present invention further relates to an access control system for validating access to a restricted area. The access control system comprises the authorization carrier reader as described herein.

[0004] Access control systems for persons are known in the prior art. They can comprise means for the detection and evaluation of access authorisations as well as mechanical blocking elements, for example in the form of turnstiles, turnstiles with one, two or three blocking arms, doors, sliding doors, lifting-sliding doors, or so-called flap gates, whereby the blocking elements are actuated in the presence of a valid access authorisation. Furthermore, access control systems for vehicles are known which have blocking elements which are actuated in the presence of a valid access authorization.

[0005] The present invention is based on the objective of improving the interaction between a person and an authorization carrier reader.

[0006] This objective is solved by the subject matter of the independent claims. Optional embodiments are described in the dependent claims.

[0007] An authorization carrier reader for an access control system is provided. The authorization carrier reader is configured to read out a visually recognizable information on an authorization carrier. The authorization carrier reader comprises a base plate and at least two cameras (optionally at least three cameras) each having a field of view. Each camera is configured to image the visually recognizable information if located in the field of view. Each camera is positioned protruding from the base plate such that at least a volume portion of the field of view of each camera extends along the base plate. The respective fields of view of the at least two cameras overlap in an overlap volume over the base plate. The respective fields of view of the at least three cameras are orientated such that at least one of the at least two cameras is capable of imaging the visually recognizable information when the visually recognizable information is located in the overlap volume.

[0008] Further, an access control system for validating access to a restricted area is provided. The access control system comprises the authorization carrier reader of one of the embodiments described herein and a controller in data-communication with the authorization carrier reader. The controller is configured to validate the authorization carrier of the authorization carrier being read out by the authorization carrier reader.

[0009] According to the embodiments described herein, the interaction between the person and the authorization carrier reader can be simplified and / or improved because the authorization carrier reader can read out the visual recognisable information irrespective of the orientation of the authorization carrier as long as the authorization carrier is held in the overlap volume. With commonly known barcode scanners or a single camera for imaging a barcode or QR code, it is necessary that the barcode or QR code is presented facing the barcode scanner or camera. Thus, the person needs to hold the authorization carrier in a particular orientation. With the embodiments described herein, this is no longer necessary. For example, a ticket with a printed barcode can be held in the overlap volume and the authorization carrier reader can read out the barcode. In this way, time and effort can be reduced because the person is no longer required to present the ticket in a particular orientation such that it can be read out.

[0010] The access control system may be provided for validating access to a restricted area, for example a working space, a building, certain restricted parts of a building, a sports venue, an event venue, a ski resort, a parking space, and / or a public transport system. The access control system may be placed at one or more checkpoints which the person needs to pass for entering the restricted area. The access control system may be placed at a border and / or separation line between the restricted area and outside of the restricted area. For example, the access control system may be placed at an entrance door or gate of the restricted area. Alternatively, the access control system may include an access blocking device (e.g. an entrance door or gate) and is configured to control the access blocking device based on the validity of the authorization carrier. The person may walk towards the access control system and, after the authorization carrier is validated by the access control system, the person walks through or walks by the access control system. For example, the access control system may control the access of individual persons to the restricted area. However, the access control system may be used for controlling the access of a vehicle is to the restricted area (e.g. a parking space). In this case, the person may be within or sit in the vehicle and driving through or by the access control system.

[0011] The access control system may include a housing in which and / or on which various components of the access control system are located. The housing of the access control system may form part of a physical barrier against unallowed access to the restricted area. For example, the housing of the access control system may limit an access area which the person needs to pass when entering the restricted area.

[0012] The access control system may provide a walkthrough portal and / or a passage sluice which may be provided by the housing of the access control system. For example, the access control system may include a movable barrier (e.g. a door, gate, turnstiles, etc) and / or form part of an immovable barrier (e.g. the housing) to which the movable barrier may be attached. It is also possible that the access control system may be configured to control the movable barrier. In this case, the access control system may not include a movable barrier and / or is separate to the movable barrier. For example, the access control system may be retro-fitted to an existing movable barrier for providing new and / or additional control of the movable barrier. The access control system may only be a controller for controlling the movable barrier.

[0013] It is also possible that the access control system, the authorization carrier reader, and / or the housing (housing and / or supporting these components) may be located next to a movable barrier, e.g. a door or gate. A valid authorization carrier may be used to open the movable barrier. The access control system, the authorization carrier reader, and / or the housing may be attached to a wall (e.g. next to a door).

[0014] The authorization carrier may include one or more types, such as a ticket, a means for identifying a person, a mobile electronical device (e.g. mobile phone or a tablet) and / or a means for electronically paying for the access to the restricted area. The authorization carrier is configured to display and / or include visually recognizable information in such a way that the visually recognizable information is visible to a person and / or the authorization carrier reader.

[0015] The visually recognizable information may include a barcode, QR code, and / or any type of information that is machine-readable and / or visually recognizable. The term “visually recognizable information” refers to any type of information that is visible to the human eye and / or can be imaged by a camera.

[0016] The authorization carrier may include any form of receipt demonstrating that access to the restricted area has been paid and / or access to the restricted area will be granted when passing through the access control system. In other words, the authorization carrier (e.g. ticket) may include visually recognizable information and / or data that notify the access control system that access to the restricted area should be granted upon presentation of the ticket. The ticket may be generated after payment and / or may be generated without payment, for example for allowing certain persons access to the restricted area.

[0017] The authorization carrier may include a physical ticket which may have a barcode, a QR code, and / or other signs printed thereon and / or that can be read out by an optical authorization carrier reader. The physical ticket may be printed at home and / or printed by a ticket vending machine or at ticket outlets.

[0018] The authorization carrier may be an electronic ticket, e.g. a set of data that is stored on a data carrier. The electronic ticket may be stored on a mobile phone or any other type of terminal user device. The electronic ticket may be displayed by the mobile phone or any other type of terminal user device for being read out by the authorization carrier reader. Thus, in case of an electronic ticket, the authorization carrier may include a display for displaying the electronic ticket in form of visually recognizable information.

[0019] The authorization carrier may include other means for demonstrating valid access to the restricted area. For example, the electronic ticket may also be stored on a data carrier such as RFID-enabled devices, for example for accessing a building or certain restricted parts of the building.

[0020] The authorization carrier reader may further include means for identifying a person which may be an identity card or any other means that allows identification of the person (e.g. a personalized token). In this case, the access control system may be further configured to check whether the person has authorisation to access the restricted area, for example whether the person as identified by the means for identifying the person is on a list that has access to the restricted area. To this end, the access control system (for example the controller) stores a list of persons which are eligible to access the restricted area. Examples will be described further below.

[0021] The authorization carrier reader may also include means for paying the access to the restricted area. This may include a credit card, a debit card, and / or other means for electronical payment. In this case, the access to restricted area can be allowed after payment. Thus, the access control system may include means for processing electronic payment. Further, the authorization carrier may be used for logging the access of the person to the restricted area.

[0022] The authorization carrier reader may - in addition to the cameras - include other types of readers each of which is configured to read a corresponding type of authorization carrier. For example, the authorization carrier reader may include an antenna and / or a transceiver for allowing nearfield electromagnetic communication with the authorization carrier (e.g. radio-frequency identification (RFID) or near-field communication (NFC)). The authorization carrier reader may also include a reader for reading credit cards or debit cards. Examples will be described further below.

[0023] The authorization carrier may include one or more types of the authorisation validation, for example a barcode or QR code that is printed on a RFID token. Further, the authorization carrier reader may include one or more embodiments for reading the respective type of authorization carrier.

[0024] The access control system may include an input device for inputting an access request (such as a touchscreen, buttons, a keyboard), a payment device for accepting cash and / or card payment, and / or an antenna for detecting a token granting access. The authorization carrier reader may include reading devices for contactless reading of access authorizations, for example via a standard for wireless communication, such as RFID, NFC, WLAN, Bluetooth, BLE, and / or UWB.

[0025] The authorization carrier reader may be mounted on or in the access control system (e.g. in or on a housing thereof). More generally, the authorization carrier reader is mounted such that the person can present the authorization carrier in such a way to the authorization carrier reader that it can be read out by the authorization carrier reader when passing the access control system. The authorization carrier reader may be in data communication with the controller, for example by a wired or wirelesscommunication.

[0026] The cameras of the authorization carrier reader may be provided for replacing a commonly known scanner for scanning the ticket. The at least two or three cameras may be configured to capture a video (a stream of images) and / or single images, for example periodically. The imaging unit may be attached to the access control system (e.g. to a housing thereof).

[0027] Each camera may include imaging optics (e.g. one or more lenses, shutters and / or other optical elements for shaping the propagation of visible light) and an optical sensor which is configured to convert the impinging light into electronic signals. The camera may be a device for recording two-dimensional images from light by electrical or electronical means. Semiconductor-based optical sensors that can detect in visible wavelength range can be used. Examples of optical sensors in the visible range are CCD sensors. The optical sensor can convert an incident light into electrical or electronic signals, with the electrical and electronic signals indicating the intensity of the incident light and / or the wavelength of the incident light, optionally with spatial resolution. For example, the optical sensor has a plurality of pixels, each of which generates electrical or electronic signals. The electrical and electronic signals indicate the intensity of the incident light and / or the wavelength of the incident light. The plurality of electrical and electronic signals generated by the pixels could be converted into a two-dimensional image which can be analysed by the controller.

[0028] The imaging optics may be configured to project the visually recognizable information onto the optical sensor. The imaging optics may define an optical axis around which field of view of the camera is provided. The field of view describes a volume which may have the shape of a cone. Any object that is arranged within the field of view, i.e. in the space or volume defined by the field of view, can be projected by the imaging optics onto the optical sensor. In other words, the field of view describes that portion of the space which can be imaged by the camera. Any object that is arranged outside of the field of view cannot be imaged by the camera. The imaging optics may be configured to change the focus for changing the layer in the field of view in which the visually recognizable information can be projected onto the optical sensor in a sharp manner. This may be done automatically as in known prior art. Alternatively, the imaging optics may have a fixed focal length. In this case, a sharp projection of the visually recognizable information onto the optical sensor of the camera may only be possible in a particular focus layer within the field of view. The thickness of the focus layer may depend on the imaging optics and / or the fineness or granularity of the visually recognizable information that needs to be resolved by the camera. The volume of overlap may correspond to the overlap of the focus layers of each camera. In other words, if the visually recognisable information is placed in the overlap volume, each camera can read out visually recognizable information if the authorization carrier is accordingly orientated. For example, by rotating the authorization carrier within the overlap volume (e.g. around an axis perpendicular to the base plate), each camera is sequentially configured to read out the visually recognisable information.

[0029] The base plate may be part of the housing of the access control system and / or the authorization carrier reader. Alternatively, the base plate may be a component that is attached to the access control system and / or the authorization carrier reader. The base plate may be flat, i.e. is not curved.

[0030] The cameras may be directly or indirectly attached to the base plate. For example, the cameras are immovably attached to the base plate or are immovably attached to the authorization carrier reader and / or the access control system such that the cameras are fixed relative to the base plate.

[0031] The cameras protrude from the base plate. The camera may include a (transparent) housing that protrudes from the base plate. The imaging optics and / or the optical sensor of the camera may be arranged within the camera housing.

[0032] For example, camera housing, the imaging optics and / or the optical sensor of the cameras may protrude from the base plate. In this way, it is possible that the field of view of the camera can extend along the base plate. This may mean, that the camera can image the visually recognisable information if it is placed in contact with or adjacent to base plate. For example, the optical axis of the camera may form an angle with the base plate that is between 0° and 45°, optionally between 10° and 30°. As the field of view is around the optical axis, a portion of the field of view can extend parallel to or along the base plate. This allows the visually recognisable information to be read out when being placed in contact with or close to the base plate. Further, if the visually recognisable information is perpendicular to the base plate, the camera can image the visually recognisable information. In other words, the visually recognisable information does not need to be held in front of the authorization carrier reader. Rather, the visually recognisable information is imaged from a side. Due to the provision of at least two or three cameras, this allows to image the visually recognisable information irrespective of the orientation of authorization carrier. Each camera may be configured to image the visually recognizable information if an optical axis of the camera forms an angle with the base plate of more than or equal to 0° (e.g. parallel to the base plate), 5°, 10°, 20°, 30°, 40°, 45°, 50°, 60°, 70°, or 75° and less than 80°, 85°, or 90°.

[0033] The volume in which the fields of view of (all) cameras overlap is considered to be the overlap volume. In other words, an object that is positioned within the overlap volume can be imaged by each camera of the authorization carrier reader. Each camera of the authorization carrier reader thus images a different side of the object (e.g. the authorization carrier).

[0034] The at least two or three cameras may be arranged in such a way that they image 360° of an outer surface of a cylinder that is arranged in the overlap volume and whose longitudinal axis is perpendicular to the base plate. In other words, the at least two or three cameras provide a full 360° of an object arranged in the overlap volume. Thereby, this 360° view is within a plane that extends parallel to the base plate. In practice, there may be a layer of a particular thickness that extends parallel to the base plate and is arranged within the overlap volume. The entire outer surface of the cylinder having a longitudinal axis perpendicular to this layer and arranged in the overlap volume may be imaged by the at least two or three cameras. In this way, as already outlined above, the visually recognisable information can be imaged by the authorization carrier reader irrespective of its orientation. Thus, the person holding the authorization carrier reader does not need to consider the correct orientation of the authorization carrier with respect to the authorization carrier reader. Rather, it is sufficient to place the authorization carrier within the overlap volume and the authorization carrier reader can read out the visually recognisable information. The controller may receive the electronic signals from the at least two or three cameras. The controller may be configured to identify the visually recognizable information in the image or video stream (e.g. provided by the electronic signals) sent by the cameras. Known algorithms, software, and / or processes may be used for identifying the visually recognizable information in the images generated by the cameras.

[0035] The controller may be configured to select the camera which completely images the visually recognisable information or images the visually recognisable information with the least distortion. The image (e.g. made up by electronic signals) of this camera may then be used for analysing the visually recognisable information, e.g. barcode or the QR code. For example, the visually recognisable information may be orientated in such a way that only one camera can image the visually recognisable information. In this case, the controller only analyses the electronic signals received from this camera whereas the electronic signals from the other cameras are disregarded.

[0036] Alternatively, the controller may be configured to assemble the visually recognisable information from the electronic signals received from two or more cameras. For example, a part of the visually recognisable information can be only read out in one camera and another part can only be read out by another camera. This may include that a part of the visually recognisable information is not visible with one of the cameras and / or is distorted such that they cannot be meaningfully read out. Thus, in this example, the controller may combine parts of the images provided by the respective cameras for generating a single image of the visually recognisable information.

[0037] The controller may include a processor and a memory which may store programs, algorithms, and / or software that is executed by the processor. The programs, algorithms, and / or software may be configured to detect or identify the visually recognisable information in the electronic signals provided by the cameras. Further, the controller may be configured to detect the presence of the authorization carrier within the overlap volume. In this case, the controller may be configured to generate an image of the visually recognisable information only if the presence of the authorization carrier in the overlap volume is determined. The controller may be configured to identify one or more of the types of authorization carriers described herein. For example, the controller may be configured to identify those types of authorization carriers that can be read out by the authorization carrier reader. For example, the controller may be configured to identify a printed ticket (e.g. by identifying a barcode and / or a QR code) and / or a mobile phone.

[0038] The controller may analyse the recorded video image for identifying an authorization carrier within the video image. To this end, the controller may include an image processing software, a neural network, and / or an artificial intelligence that enables the controller to identify the authorization carrier.

[0039] In another example, the controller may be configured to assemble the visually recognisable information from the electronic signals received from the cameras as outlined above. The visually recognizable information may include information on the person, a number (e.g. for identifying the person and / or a number of the ticket), and / or other types of information that can be used for assessing the validity of the access authorisation of the authorization carrier. These types of information may be directly printed onto the authorization carrier (e.g. such that the person can read it themselves) and / or encrypted in a machine-readable format, e.g. a bar code or a QR code.

[0040] The controller may be further configured to determine whether the visually recognisable information indicates a valid authorisation to access the restricted area. For example, the controller may compare the visually recognisable information with a list indicating all valid authorisations to the restricted area. The list may be stored on the controller. However it is also possible that the controller forwards the retrieved visually recognisable information to a server in data communication with the controller. The server may then determine whether the visually recognisable information corresponds to a valid authorisation to the restricted area and sends back an electronic signal to the controller whether access to restricted area is to be granted or not. Alternatively, the server may control the access to the restricted area. In this case, the server may be in data communication with the access blocking device, e.g. a door or gate.

[0041] The controller may be arranged within the housing of the access control system and / or authorization carrier reader. The controller may be a computer or server remote from the housing of the access control system and / or the authorization carrier reader. The authorization carrier reader may be a box what can be attached to a wall and is configured to read out the authorization carrier. The analysis of the information and / or the electronic signals generated by the cameras may be executed external to the authorization carrier reader.

[0042] The controller may validate the authorization carrier after it has been read out by the authorization carrier reader, e.g. after the person presented the authorization carrier to the authorization carrier reader. The validation of the authorization carrier may include checking whether the authorization carrier is valid, which may include checking the expiry date of the access request, whether the authorization carrier provides valid access to the restricted area controlled by this access control system, and / or whether the person as identified by the authorization carrier is on a list of persons allowed to access the restricted area.

[0043] The validation of the authorization carrier may further include an update of the status of the authorization carrier / ticket (e.g. valid to no longer valid), logging the time and / or date of the access of the person to the restricted area, and / or a successful payment of a ticket to the restricted area.

[0044] The validation of the authorization carrier may be based on information and / or data which is stored on the authorization carrier and which is read out by the authorization carrier reader and processed by the controller.

[0045] In an optional embodiment, the base plate includes a first side and a second side opposing the first side. Optionally, a first camera of the at least three cameras is located at the first side and a second camera of the at least three cameras is located at the second side.

[0046] The first side and the second side may form the entire perimeter of the base plate. For example, the first side may extend along an outer surface or edge of the base plate which corresponds to an angle of 180°. Similarly, the second side may extend an outer surface or edge of the base plate which corresponds to an angle of 180°. The first side may correspond to a half of the perimeter of the base plate and the second side may correspond to the other half of the perimeter of the base plate. If the first camera of the at least two cameras is arranged at the first side (e.g. outside or inside the perimeter) and the second camera of the at least two cameras is arranged at the second side (e.g. outside or inside the perimeter), it is possible that the first camera and the second camera provides a 360° view of an object (the authorization carrier) in the overlap volume.

[0047] A third camera of the at least three cameras may be arranged at the first side or the second side. Further, a fourth camera of the at least four cameras may be arranged at or on that side of the first side and the second side at which the third camera is not arranged. In this way, these additional cameras provide additional views for providing a better coverage of the 360° view.

[0048] In an optional embodiment, the at least two or three cameras are equally distributed around a normal to the base plate.

[0049] For example, an angle around the normal to the base plate may be 180° (for two cameras), 120° (for three cameras), or 90° (for four cameras). This provides a good coverage for imaging the visually recognisable information irrespective of the orientation of the authorization carrier.

[0050] In an optional embodiment, the authorization carrier further includes a frame protruding from the base plate and at least partially surrounding the base plate. Optionally the at least three cameras are arranged on the frame.

[0051] The frame may include two or more sections or is a component that completely extend around the base plate. The frame may have the shape of the base plate or follows the shape of the base plate. The frame may be arranged at or on an edge of the base plate.

[0052] The frame may be provided for highlighting the area of the base plate. For example, the frame provides a visible recognisable border of the base plate because the frame protrudes from the base plate. An inner surface of the frame may be in contact with the base plate (e.g. an edge of the base plate) such that there may be a continuous surface from the base plate to the inner surface of the frame.

[0053] The cameras may be arranged on the frame or within a circumference of the inner surface of the frame. It is also possible that the cameras are arranged at interruptions of the frame, for example between two sections of the frame. In other words, the cameras and the frame are provided such that the frame does not obstruct the field of view of the respective cameras.

[0054] If the cameras are arranged on the frame, the cameras may be arranged on the inner surface of the frame. Further, the frame provides that the cameras are offset from the base plate such that the cameras protrude from the base plate as described above.

[0055] In other words, the frame may be used for positioning the cameras as protruding from the base plate.

[0056] The frame may be a separate component from the base plate. In other words, the frame may be attached to the base plate when assembling the authorization carrier reader. In other embodiments, the frame and the base plate for a unitary component. It is also possible that the housing includes a flat surface and the attachment of the frame on this flat surface forms the base plate.

[0057] In an optional embodiment, the frame and the base plate form a cavity in which the authorization carrier can be positioned.

[0058] The cavity may form a half space into which the authorization carrier they can be inserted. The dimensions of the frame and / or the base plate are such that authorization carrier can be positioned within the cavity without contacting the inner surface of the frame and / or the base plate. For example, the frame may have a diameter or diagonal that is between 5 cm to 30 cm, optionally between 10 cm to 20 cm.

[0059] The overlap volume may be partially or entirely located within the cavity formed by the base plate and the frame. Thus, the frame may be a means for indicating to the person where to place the authorization carrier such that it can be read out by the authorization carrier reader.

[0060] The majority of the overlap volume may be outside of the frame. For example, the frame protrudes from the base plate by 3 cm, 5 cm, 10 cm, 15 cm, or 20 cm. Thus, the frame may be provided for highlighting the position of the overlap volume. However, it may not be necessary to insert the authorization carrier into the cavity. It may be sufficient to place the authorization carrier in front of the frame such that the cameras can image the visually recognizable information. In an optional embodiment, an inner surface of the frame is circular, for example as seen in a cross-sectional view parallel to the base plate.

[0061] The frame may form a ring. In this case, an inner surface and an outer surface of the frame may be circular (as seen in a cross-sectional view parallel to the base plate). It is also possible that the frame has an outer surface which is not circular. For example, the frame may have the general shape of a cuboid with a cavity that has an inner surface which is circular.

[0062] It is also possible that the frame has an inner surface that is not circular. For example, the cavity as provided by the frame and the base plate may have a triangular, rectangular, or quadratic cross-sectional view (e.g. parallel to the base plate).

[0063] In an optional embodiment, a centre point of the circular inner surface is within the overlap volume.

[0064] The circular inner surface of the frame naturally prompts the person to place the authorization carrier in the centre of the frame. In this case, the authorization carrier is placed within the overlap volume such that the visually recognisable information can be read out irrespective of the orientation of the authorization carrier. Thus, the frame intuitively guides the person to the overlap volume.

[0065] The centre point may correspond to the centre of the circular in the surface of the frame in a cross-sectional view, for example parallel to the base plate.

[0066] In optional embodiment, the frame includes an illumination unit for guiding a person to the overlap volume.

[0067] The person may be a human being that is interacting with the authorization carrier reader and / or may carry the authorization carrier. For example, the person tries to obtain access to restricted area by presenting the authorization carrier to the authorization carrier reader.

[0068] The illumination unit may include a light source generating light in the visible wavelength range, a light guide, and / or a transparent or translucent cover. The light source may include one or more light bulbs, one or more LEDs (light-emitting diodes), and / or other sources which are configured to generate light. The light source may be arranged within the frame. The transparent or translucent cover may be provided on the frame for covering the light source. The transparent or translucent may be integrally formed with frame. In this case, the frame provides a cover for the light source and / or the light source is arranged within the frame.

[0069] In another example, a single light source may be provided and / or the light guide guides the light generated by the (single) light source to various locations on the frame (e.g. on an outer surface of the frame). The illumination unit may illuminate one or more areas or locations on an outer surface of the frame or the illumination unit may illuminate the entire frame.

[0070] The light generated by the illumination unit is emitted in such a way that the person standing in front of the authorization carrier reader can see the light generated by the illumination source. The illuminated frame helps the person to identify the frame and, therefore, where to place the authorization carrier such that it can be read out by the authorization carrier reader.

[0071] In an optional embodiment, the illumination unit is configured to illuminate the overlap volume.

[0072] In this example, the illumination source is not only configured to illuminate the frame for being better recognisable to the person. The illumination source is alternatively or additionally configured to illuminate the overlap volume such that the visually recognisable information can be better read out by the cameras. This is especially helpful for tickets onto which the visually recognisable information is printed and the ticket is read out in the dark. Without the illumination source, the cameras may not be capable of imaging the visually recognisable information.

[0073] In this case, the illumination unit is configured generate light that is directed inwards, for example to the centre of the frame. For example, the light generated by the illumination unit is emitted on the inner surface of the frame. The illumination unit may generate light close to the cameras and / or fields of illumination may overlap with the field of view of the camera. The field of illumination may correspond to the volume that is illuminated by a single light source of the illumination unit and / or an exit point of the light guide. For example, the illumination unit may include light sources that are arranged on or below the inner surface of the frame and / or the inner surface of the frame may be provided by the transparent or translucent cover.

[0074] The illumination unit may further include light sources that are arranged on or below other surfaces other than the inner surface of the frame. These light sources may be used for guiding the person to the frame and / or the overlap volume.

[0075] In an optional embodiment, the illumination unit extends along the (entire) frame.

[0076] In this case, a 360° illumination of the overlap volume can be provided by the illumination source. Further, a ring or continuous perimeter of the frame can be illuminated for highlighting a centre of the frame at which the overlap volume may be arranged.

[0077] This end, a plurality of light sources may be provided which can be equally distributed along the extension of the frame, e.g. on, below, and / or along the inner surface of the frame. It is also possible that only the inner surface of the frame is illuminated by the illumination unit. In this case, the light generated at the inner surface has a double purpose of illuminating the overlap volume and guiding the person to the overlap volume.

[0078] The controller may be in data communication with the illumination unit. The controller may control the illumination unit to start generating light if the presence of the person in front of the authorization carrier reader is detected. This may be done by using the cameras and / or starts interacting with authorization carrier reader, for example by actuating an interface of the authorization carrier reader.

[0079] In an optional embodiment, the frame includes a vibration source for providing haptic feedback to the person where the overlap volume is.

[0080] The vibration source may include a buzzer and / or vibrator which may be configured to actuate a housing of the frame. Alternatively the vibration source may generate a vibration that is transmitted to the frame and / or is tactilely recognisable by a person. Thus, the vibration source provides a haptic notification to the person where the frame is located. Further, the vibration source may also be configured to generate a sound which indicates that the frame is vibrating such that a person can tactilely determine where the frame is located. This may help visually impaired persons to determine the location of the frame and, therefore, the location of the overlap volume. In other words, the illumination source and / or the vibration source can be regarded as a means for guiding the person to the location where the person should place the authorization carrier such can be read out by the authorization carrier reader. As elaborated above, it is only necessary to place authorization carrier in the overlap volume and, subsequently, the authorization carrier reader can read out the visually recognisable information. The orientation of the authorization carrier can be random which may also help visually impaired persons because they no longer need to consider the orientation of the authorization carrier.

[0081] In an optional embodiment, the base plate includes display for displaying information to the person.

[0082] The base plate may be provided by a surface of the display. The display may include any means for displaying visually recognisable information and / or the display is an output device for presenting information in a visual format. The display may include an LCD screen. The display may be a touchscreen.

[0083] The frame may surround the display. The controller may be in data communication with the display and / or may be configured to control the display. The display may be used to display information to the user. For example, the display may display further information where the overlap volume is located. For example, the display may display one or more arrows which point to the overlap volume.

[0084] In an optional embodiment, the authorization carrier reader further includes one or more near-field antennas for providing near-field communication over the base plate.

[0085] The one or more near-field antennas may be configured for communication with the authorization carrier. The one or more near-field antennas may be transceivers for wireless communication with the authorization carrier. For example, the near-field antennas may be provided for wireless communication, such as RFID, NFC, WLAN, Bluetooth, BLE, and / or UWB. The one or more near-field antennas are arranged and / orientated such that near-field communication is possible over the base plate. For example, the one or more near- field antennas are arranged around the base plate and / or behind the base plate.

[0086] Thus, if the person holds the authorization carrier in front of the base plate (e.g. in the cavity provided by the base plate and the frame), near-field communication between the authorization carrier and the one or more near-field antennas is possible. Thus, the authorization carrier reader may be additionally configured to read out authorization carriers that wirelessly operate. For example, this may be used for accepting different types of authorization carrier. In any case, the frame may guide the user to the point of interaction, for example the overlap volume or the volume in which near-field communication is possible.

[0087] The one or more new field antennas may be in data communication with the controller which may be configured to control the one or more near-field antennas. The controller may be configured not to only read out authorization carrier using the one or more near-field antennas, but may also write to the authorization carrier, e.g. using NFC or SR-RFID.

[0088] In an optional embodiment, the one or more near-field antennas are arranged in or on the frame and / or the near-field communication is provided in the overlap volume.

[0089] With this embodiment, all electronic components of the authorization carrier reader (except for the display) may be arranged in the frame. In this case, for providing the authorization carrier reader, the frame needs to be attached to a base plate. This simplifies the manufacturing and the assembly of the authorization carrier reader.

[0090] It is also advantageous that the range for near-field communication is provided in the overlap volume. In this case, the frame, the illumination source, and / or the vibration source may guide the person to the location where the cameras can read out the visually recognisable information and near-field communication with authorization carrier is provided. Further, the point of interaction with the authorization carrier reader is the same regardless of the type of authorisation, for example whether visually recognisable information or an electronic token (e.g. a RFID on electronic ticket stored on the mobile device and read out using NFC) are used by the person. This simplifies the interaction and / or user have their authorization carrier read out at the same location. In an optional embodiment, the access control system further comprises an access blocking device. Optionally, the controller is configured to send an opening signal to the access blocking device after the authorization carrier being read by the authorization carrier reader, optionally after the authorization carrier has been validated.

[0091] In this way, the access control system may not only validate access to the restricted area but also controls the access to the restricted area, e.g. using the access blocking device. Further, the validation of the authorization carrier may include the control of the access blocking device.

[0092] The access blocking device can include one or more mechanical blocking elements which may be considered a movable barrier. The blocking elements of access blocking devices for persons may include turnstiles, turnstiles with one, two or three blocking arms, doors, sliding doors, gates, lifting-sliding doors, or so-called flap gates, whereby the blocking elements can be actuated in the presence of a valid access authorisation. Furthermore, access control systems for vehicles are known which have blocking elements such as (rotatable) barriers.

[0093] The blocking elements of the access blocking device can be configured to be moved between an open position and a closed position. In the closed position, the access blocking device (e.g. the one or more blocking element) may block a part or the complete access area defined by the access control system. In the open position, the access blocking device (e.g. the one or more blocking element) may unblock a part or the complete access area for granting access through the access area.

[0094] The access blocking device (e.g. the one or more blocking element) can be movable (not locked) in the open position such that the person and / or vehicle can push / move the access blocking device (e.g. the one or more blocking element) in order to access the restricted area. In the closed position, the access blocking device (e.g. the one or more blocking element) is not movable (e.g. locked). In this embodiment, the access blocking device can comprise turnstiles. In other words, the open position does not only refer to an embodiment in which the access blocking device (e.g. the one or more blocking element) is not positioned in the access area. Rather, the open position defines a state of the access blocking device in which the access blocking device grants access, i.e. a person and / or vehicle can pass the access control system.

[0095] The access control system may comprise a supporting device for supporting the one or more blocking elements. The housing may at least partially surround the supporting device. Further, the supporting device may form a part of the housing. The one or more blocking elements may be movable relative to the housing. The supporting device can support, allow movement of, and / or move the one or more blocking elements from the open position to the closed position.

[0096] The supporting device may include an actuator, such as an electric motor, for moving the one or more blocking elements. Alternatively or additionally, the supporting device may comprise locking means for locking and unlocking the access blocking device. In an unlocked state or open position, the one or more blocking elements can be moved (e.g. from the closed position to the open position) by the person and / or the vehicle. In a locked state, the one or more blocking elements cannot be moved (e.g. from the closed position to the open position) by the person and / or the vehicle. The locking means provides mechanical control of access to the restricted area.

[0097] The access blocking device (e.g. supporting device) may put the access blocking device in the open state upon receiving opening signal so that the person can pass the access control system.

[0098] The controller may be configured to assess whether the authorization carrier authorises access to the restricted area. For example this may include checking whether the ticket is valid and / or whether payment has been made. After reading out the authorization carrier, determining that the person is allowed to access the restricted area, and / or validating the authorization carrier, the controller generates the opening signal which may be sent to the access blocking device (e.g. to the actuator for moving the access blocking device). Further, as outlined above, the validation of the authorization carrier may include generating the opening signal.

[0099] The controller may be further configured to check whether the person has passed the access control system, for example by checking whether the person has opened the gate and / or by sensors which can detect a passing person (e.g. a light barrier). The ticket may only be validated after the person has passed the access control system. However it is also possible that the ticket may be validated after the opening signal has been generated (i.e. without checking whether the person has passed the access control system).

[0100] The access blocking device may permanently be in an open position (e.g. the gates are open) unless a closing signal is generated. The closing signal may be generated if the authorization carrier (e.g. a ticket) is found invalid and / or no payment is made. Thus, the access blocking device may remain in the open position upon receiving the opening signal. In this case, the opening signal may correspond to a signal or processing result that the person is granted access to the restricted area.

[0101] In optional embodiment, the authorization carrier reader is further configured to obtain biometric data of the person.

[0102] For example, a biometric camera may be provided for obtaining biometric features (of a face and / or an iris) of the person. The biometric camera may be provided behind the base plate. In this case, the frame, the illumination unit, and / or the vibration source may further guide the person to the location where the biometric features are obtained. Alternatively, the biometric camera may be provided offset from the base plate.

[0103] In an alternative embodiment, the at least two or three cameras may further be configured to image a person to obtain biometric features. In this case, the overlap volume may include a portion that is arranged outside of the cavity provided by the frame and the base plate.

[0104] The display may be configured to display the current position of the person with respect to an ideal position which facilitates the positioning of the person with respect the camera providing the biometric features.

[0105] This disclosure may also be summarised as outlined below.

[0106] The present disclosure relates to an access control system that offers highest user- friendliness, optionally due to its ring-shaped arrangement of sensors (e.g. cameras) and / or the integration of various access media. The access control system can be designed to support visually recognizable information (e.g. barcodes, QR codes, visual text, and / or images), RFID, NFC, biometric data, and / or code entries (e.g. using the input device), with intuitive user guidance at the forefront. The disclosure falls within the field of security technology, specifically in access control systems optimized for intuitive operation and user-friendliness.

[0107] An embodiment of the access control system described herein may be characterized by a ring-shaped housing or frame (circle or other shape) that prompts the user to intuitively hold the authorization carrier to the centre of the ring. This shape facilitates the authorization carrier’s detection and thus improves the user experience (UX). The provision of various sensors (e.g. cameras) allow for an orientation-independent reading of the medium.

[0108] Optional features of the access control system are: a. Illumination of the circular ring, which increases visibility and provides visual feedback to the user. b. A display behind the (circular) frame that can show additional information and / or further improve interaction with the access control system. c. Optical or acoustic feedback can facilitate interaction with the user / person. d. Haptic feedback (vibration) can facilitate interaction with visually impaired persons. For example, a vibration source is provided with and / or in the frame. e. Various digital media can not only be read but also written to (NFC I SR- RFID). f. The access control system is also able to send data to the authorization carrier (such as files to the mobile phone) g. The unique shape of the frame allows for haptic recognition of the access control system (e.g. visually impaired persons)

[0109] Optional advantages of the access control system are: a. The frame of the access control system can be flexibly installed next to access doors, people and car access, or on its own portable stands to support a wide range of application scenarios, or at restricted areas of any kind. b. Intuitive Operation: The frame (e.g. its ring-shaped form) guides the person, simplifying operation. c. Versatility: Supports a variety of access media. d. 11 : User experience is optimized through shape, camera positioning, illumination, interaction, haptic feedback, and / or the display.

[0110] 11 e. Massively increased usability and / or maximum throughput. Because several functions can be handled with one hardware, there may be increased demand and / or quantities which can result in a reduction of production costs.

[0111] It is human nature to seek intuitive solutions, and the positioning of the authorization carrier within a (circular) element aligns with this propensity. The (circular) shape of the frame inherently invites interaction and centres focus, guiding the user to place the authorization carrier — be it a paper ticket or a digital token on a mobile phone — within the bounds of the frame. This centric design is particularly advantageous for biometric scanning, as it naturally draws the user’s attention and guides positioning, facilitating optimal alignment for the scanning process. The circle’s universal appeal as a focal point enhances the user experience by simplifying the action required to engage with the system.

[0112] The invention is explained in more detail below by way of example with reference to the accompanying figures. Therein,

[0113] Fig. 1 shows a schematic representation of an access control system;

[0114] Figs. 2a to 2c show different orientations of an authorization carrier with respect to an authorization carrier reader of the access control system of Fig. 1 ,

[0115] Figs. 3a and 3b show different orientations of a further authorization carrier with respect to the authorization carrier reader of Fig. 1 ;

[0116] Fig. 3c shows a display of the authorization carrier reader of Fig. 1 in operation; and

[0117] Figs. 4a to 4c show different shapes of authorization carrier readers of the access control system of Fig. 1 .

[0118] Fig. 1 shows an access control system 10 for controlling and / or validating access to a restricted area. The access control system 10 of Fig. 1 controls access of a person 12 to the restricted area. The access control system 10 further includes an access blocking device 14 which is exemplified by a door in the embodiment of Fig.1 . In other examples, the access blocking device 14 can include turnstiles, turnstiles with one, two or three blocking arms, sliding doors, gates, lifting-sliding doors, or so-called flap gates. The access blocking device 14 separates the restricted area (in Fig. 1 : the area behind the door) from an unrestricted area (in Fig. 1 : the area in front of the door).

[0119] In a closed position of the access blocking device 14 (as shown in Fig. 1 ), the access blocking device 14 blocks the access to the restricted area such that the person 12 cannot pass the access control system 10. In an open position of the access blocking device 14 (not shown in the figures), the access blocking device 14 unblocks access area 14 such that the person 12 can pass through the access control system 10. For example, in the closed position, the door 16 is locked and, in the open position, the door is unlocked.

[0120] The access control system 10 may further include a controller 24 and / or an authorization carrier reader 16, which optionally includes a base plate 18, a frame 20, cameras 22, a display 26, and / or a biometric camera 28.

[0121] The base plate 18 may be a flat surface that is exposed. The base plate 18 may be part of a housing of the authorization carrier reader 16. The base plate 18 is surrounded by the frame 20 which protrudes from the base plate 18. A cavity is provided by the base plate 18 and the frame 20.

[0122] In the embodiment of Fig. 1 , the frame 20 has a ring shape. An inner surface of the frame 20 and an outer surface of the frame 20 are circular. The inner surface of the frame 20 may be a radially inner surface of the frame 20 and the outer surface of the frame 20 may be a radially outer surface of the frame 20.

[0123] The frame 20 may include an illumination unit (not visible in the figures) which can be configured to illuminate the cavity provided by the frame 20 and the base plate 18 and / or the outer surface of the frame 20. The illumination source may include a plurality of light sources (e.g. LEDs) which can be arranged underneath a transparent or translucent cover and / or a transparent or translucent portion of a housing of the frame 20. In this way, the outer surface (e.g. a surface of the frame 20 facing away from the base plate 18) can be illuminated. This may help to guide the person 12 to frame 20, e.g. the illumination source provides assistance in finding the frame 20.

[0124] As mentioned above, the illumination source may also be configured to illuminate the cavity. This may be used to illuminate an authorization carrier 30 positioned in the cavity (as shown in Figs. 2a to 2c). For example, the illumination source may be used to illuminate a visually recognizable information 30a that is provided on the authorization carrier 30, e.g. a barcode or QR-code on a ticket. This allows imaging the visually recognizable information 30a using the cameras 22 (as outlined below) even if the authorization carrier reader 16 is in the dark.

[0125] The illumination source may extend along the circumference of the frame 20. For example, the light sources of the illumination unit are equally distributed along the frame 20. This may provide an even or homogenous illumination of the outer surface of the frame 20 and / or the cavity. For example, the visually recognizable information 30a is illuminated irrespective of the orientation of the authorization carrier 30 as depicted in Figs. 2a to 2c.

[0126] In the examples shown in the figures, the authorization carrier reader 16 includes three cameras 22. However, it is also possible that two, four, or more cameras 22 are provided. Each camera 22 is located and orientated to image along the base plate 18. To this end, the cameras 22 are located offset from the base plate 18. For example, as shown in Figs. 1 to 3c, the cameras 22 are arranged on the frame 20. Thus, a portion of the field of view of the cameras 22 extends along the base plate 18. The cameras 22 can therefore image the visually recognizable information 30a if the authorization carrier 30 is arranged (approximately) perpendicular to the base plate 18 (as depicted in Figs. 2a to 2c). In other words, the authorization carrier 30 (e.g. the ticket) may not be held parallel to the base plate 18 as with known authorization carrier readers having a front camera (e.g. a camera whose optical axis is perpendicular to the housing).

[0127] The fields of view of the cameras 22 overlap in an overlap volume which is - at least partially - located in the cavity provided by the frame 20 and the base plate 18. The overlap volume may be in the centre of the circular frame 20. The overlap volume may be located around the ticket as shown in Figs. 2 and 2c. Thus, at least one of the cameras 22 can image the visually recognizable information 30a irrespective of the orientation of the authorization carrier 30 as depicted in Figs. 2a to 2c. The visually recognizable information 30a may be imaged by the upper two cameras 22 (see Fig. 2a), by the lower camera 22 (see Fig. 2b), or the upper left camera 22 (see Fig. 2c) depending on the orientation of the authorization carrier 30. In other words, the cameras 22 provide a 360° view of the cavity in the overlap volume. The circular shape of the frame 20 prompts the person 12 to place the authorization carrier 30 in the centre of the frame 20 and, therefore, in the overlap volume. Thus, the shape of the frame 20 provides an intuitive guide for the person 12 where to place the authorization carrier 30. Further, the person 12 does not need to consider the orientation of the authorization carrier 30 because, as outlined above, the provision of a plurality of cameras 22 offset from the base plate 18 facilitates imaging the visually recognizable information 30a irrespective of the orientation of the authorization carrier 30.

[0128] The cameras 22 may be evenly distributed along the extension of the frame 20. More generally, a first camera of the cameras 22 is arranged at a first or upper side of the frame 20 or the base plate 18 and a second or lower camera of the cameras 22 is arranged at a second lower side of the frame 20 or the base plate 18. This provides that the two opposing sides of the authorization carrier 30 are imaged if the authorization carrier 30 is located in the overlap volume. In the embodiment of Figs. 1 to 3c, two cameras of the cameras 22 are located at the first or upper side of the frame 20 or the base plate 18 and a single camera of the cameras 22 is arranged at the second or lower side of the frame 20 or the base plate 18. The cameras 22 are arranged at an angular distance of 120° in the example shown in Figs. 1 to 3c.

[0129] Each camera 22 may include imaging optics and an optical sensor. The imaging optics are configured to project the visually recognizable information 30a onto the optical sensor if the visually recognizable information 30a is located in the overlap volume. The optical sensor is configured to generate electronic signals depending on the intensity and / or the wavelength of the impinging light. The electronic signals may be data that can be transferred into an electronic image that can be displayed by a display.

[0130] The controller 24 is in data-communication with the access blocking device 14, the cameras 22, the illumination source, the display 26, and / or the biometric camera 28, for example to control these components. The controller 24 may include a processor and a memory which may store programs, algorithms, and / or software that are executed by the processor. The controller 24 may be arranged within the housing of the authorization carrier reader 16 (e.g. not exposed on the authorization carrier reader 16) which is why the controller 24 is indicated by dashed lines in Fig. 1. The controller 24 may receive the electronic signals from the cameras 22 and generates an electronic image of the visually recognizable information 30a from the electronic signals of the cameras 22. To this end, the controller 24 either uses the electronic signals from one of the cameras 22 (in case only one of the cameras 22 images the visually recognizable information 30a), selects a less distorted image of the visually recognizable information 30a from the electronic signals from two cameras 22 (in case two of the cameras 22 image the visually recognizable information 30a), or combines the electronic signals from two cameras 22 (in case two of the cameras 22 image only a portion of the visually recognizable information 30a, respectively) to generate a complete image of the visually recognizable information 30a.

[0131] The controller 24 is further configured to extract data and / or information from the visually recognizable information 30a, for example data and / or other information that are stored in the barcode or QR code. Based on the data and / or information received from the authorization carrier 30, the controller 24 may be further configured to validate the authorization carrier 30 which may include assessing whether authorization carrier 30 provides valid access to the restricted area. If so, the controller 24 may unlock the access blocking device 14.

[0132] The controller 24 may also control the illumination source. For example, the controller 24 turns on the illumination source if the light level around the authorization carrier reader 16 is below a certain threshold. Further, the controller 24 may be configured to detect the presence of the person 12 in front of the authorization carrier reader 16. If the person 12 is detected to be in front of the authorization carrier reader 16, the controller 24 may turn on the illumination source to assist the person 12 in finding the location where to place the authorization carrier 30.

[0133] The display 26 may provide further information and / or notifications to the person 12. The display 26 may be a touchscreen such that the display 26 can be used as an input device.

[0134] The biometric camera 28 may be configured to provide face recognition of the person 12. For example, the controller 24 may extract biometric data from the image of the person 12 generated by the biometric camera 28 and may only grant access to the restricted area if the identity of the person 12 is confirmed by the biometric data. This may provide a two-step verification process. For example, identity information is provided by reading out the visually recognizable information 30a on the authorization carrier 30 using the cameras 22 and the identity of the person 12 is confirmed using a face image of the person 12 generated by the biometric camera 28.

[0135] It is also possible that the biometric camera 28 is omitted and the function of the biometric camera 28 is taken over by the cameras 22. In this case, the cameras 22 are orientated in such a way that a portion of their fields of view allow imaging the person 12 (e.g. a face of the person 12) in front of the base plate 18 and / or the frame 20.

[0136] The authorization carrier reader 16 may further include one or more near-field antennas for providing near-field communication with the authorization carrier 30.

[0137] The one or more near-field antennas are not shown in the figures and / or are provided within the frame 20. The one or more near-field antennas are located and orientated to provide near-field communication in the cavity and / or in the overlap volume. The one or more near-field antennas can be provided such that the authorization carrier reader 16 can be used to additionally read out authorisation to access the restricted area via near-field communication.

[0138] For example, the authorisation to access the restricted area can be stored as visually recognizable information 30a (e.g. a bar code or QR code on a ticket or displayed by mobile device) or as an electronic ticket that can be read out using near-field communication. An example for the latter is an electronic ticket stored on a mobile device which provides near-field communication. As shown in Figs. 3a and 3b, the mobile device is an example of the authorization carrier 30 and is held in the cavity (see Fig. 3a) or in front of the cavity (see Fig. 3b) for allowing near-field communication between the mobile device and the authorization carrier reader 16.

[0139] The base plate 18 may include the display 26 as shown in the exemplary embodiment of Fig. 3c. In this case, the display 26 may not be arranged on the housing of the authorization carrier reader 16 as shown in the example of Fig. 1. An outer surface of the display 26 may provide the base plate 18. The display 26 implemented as the base plate 18 may have the same functionality as the display 26 as shown in the example of Fig. 1 . Alternatively or additionally, the display 26 may provide information on where to place the authorization carrier 30. For example, the display 26 show arrows which point to the overlap volume.

[0140] In the example of Fig. 3c, the display 26 may display an outline of a head of a person. The cameras 22 may - in this example - also be configured to image the face of the person 12 (e.g. are provided instead of the biometric camera 28). The display 26 may also display the imaged face of the person 12 on the display 26 such that the person 12 can position themselves relative to the outline of the head displayed on the display 26. This may help the person 12 to correctly position their face such that biometric data can be gathered.

[0141] The embodiments of the frames 20 of Figs. 4a to 4c have the same features, characteristics, and optional embodiments as the frames 20 of Figs. 1 a to 3c, except for the following differences:

[0142] The frame 20 of the example of Fig. 4a has a circular inner surface (similar to the frame 20 of Figs. 1 to 3c) and a rectangular or quadratic outer surface. Thus, the frame 20 of Fig. 4a may be considered a cuboid or cube having a circular cavity. Thus, the frame 20 does not have a constant thickness between the outer surface and the inner surface along the extension of the inner surface. The cameras 22 may be arranged on the inner surface similar to the cameras 22 of the examples of Figs. 1 to 3c.

[0143] The frame 20 of the example of Fig. 4b has an elongate and / or oval shape. The inner surface and the outer surface of the frame 20 have the same shape. The cameras 22 may be equally distributed along the inner surface of the frame 20.

[0144] The frame 20 of the example of Fig. 4c has a circular outer surface (similar to the frame 20 of Figs. 1 to 3c) and a triangular inner surface. Thus, the frame 20 of Fig. 4c may be considered a disc with a triangular cavity. The frame 20 does not have a constant thickness between the outer surface and the inner surface along the extension of the inner surface. The cameras 22 may be arranged on the inner surface. For example, the cameras 22 are located in the corner of the triangular cavity. This may prompt the person 12 to align the authorization carrier 30 parallel to a side of the triangular cavity. In this case, an optical axis of one of the cameras 22 may be perpendicular to the authorization carrier 30 which may reduce a distortion of the image of the visually recognizable information 30a.

Claims

Claims1. An authorization carrier reader for an access control system (10), the authorization carrier reader (16) being configured to read out a visually recognizable information (30a) on an authorization carrier (30), the authorization carrier reader (16) comprising a base plate (18), and at least three cameras (22) each having a field of view, each camera (22) being configured to image the visually recognizable information (30a) located in the field of view, wherein each camera (22) is positioned protruding from the base plate (18) such that at least a volume portion of the field of view of each camera (22) extends along the base plate (18), wherein the respective fields of view of the at least three cameras (22) overlap in an overlap volume over the base plate (18), wherein the respective fields of view of the at least three cameras (22) are orientated such that at least one of the at least three cameras (22) is capable of imaging the visually recognizable information (30a) when the visually recognizable information (30a) is located in the overlap volume.

2. The authorization carrier reader of claim 1 , wherein the base plate (18) includes a first side and a second side opposing the first side, wherein a first camera of the at least three cameras (22) is located at the first side and a second camera of the at least three cameras (22) is located at the second side.

3. The authorization carrier reader of claim 1 or 2, wherein the at least three cameras (22) are equally distributed around a normal to the base plate (18).

4. The authorization carrier reader of any preceding claim, further including a frame (20) protruding from the base plate (18) and at least partially surrounding the base plate (18),wherein optionally the at least three cameras (22) are arranged on the frame(20).

5. The authorization carrier reader of claim 4, wherein the frame (20) and the base plate (18) form a cavity in which the authorization carrier (30) can be positioned.

6. The authorization carrier reader of claim 4 or 5, wherein an inner surface of the frame (20) is circular.

7. The authorization carrier reader of claim 6, wherein a centre point of the circular inner surface is within the overlap volume.

8. The authorization carrier reader of any one of the claims 4 to 7, wherein the frame (20) includes an illumination unit for guiding a person (12) to the overlap volume.

9. The authorization carrier reader of claim 8, wherein the illumination unit is configured to illuminate the overlap volume.

10. The authorization carrier reader of claim 8 or 9, wherein the illumination unit extends along the frame (20).11 . The authorization carrier reader of any one of the claims 4 to 10, wherein the frame (20) includes a vibration source for providing haptic feedback to the person (12) where the overlap volume is.

12. The authorization carrier reader of any preceding claim, wherein the base plate (18) includes display (26) for displaying information to the person (12).

13. The authorization carrier reader of any preceding claim, further including one or more near-field antennas for providing near-field communication over the base plate (18).

14. The authorization carrier reader of claim 12 when depending on any one of the claims 4 to 8, wherein the one or more near-field antennas are arranged in or on the frame (20) and the near-field communication is provided in the overlap volume.

15. An access control system for validating access to a restricted area, comprising the authorization carrier reader (16) of any preceding claim, and a controller (24) in data-communication with the authorization carrier reader (16), the controller (24) being configured to validate the authorization carrier (30) after the authorization carrier being read out by the authorization carrier reader (16).

Images