Abstract: A method for determining whether a video camera is out-of-focus comprises: capturing image data; setting a focus setting difference threshold based on a filter function configured to filter the image data; adjusting a focus setting between a present focus setting and an altered focus setting such that a first subset of the image data is captured with the video camera being set in the present focus setting and such that a second subset of the image data is captured with the video camera being set in the altered focus setting, wherein the adjusting is performed such that a difference between the present and altered focus settings is below the threshold; forming the video stream by applying the filter function on the image data; determining first and second focus metrics of the image data; and determining whether the video camera is out-of-focus by comparing the first and second focus metrics.

Abstract: A method and apparatus for storing video data includes three or more cameras and a storage space. The storage space is partitioned into an initial set of allotted portions for storing video data captured by the video cameras. A video quality value is set for encoding video by each camera, and it is periodically determined whether maintaining the video quality value would cause the camera to exceed the allotted portion of storage space. If it is determined that the amount of video data for a camera exceeds its allotment of space, the video quality is reduced. If it is determined that the video quality from a camera falls below a quality threshold, the storage space is re-partitioned into which increased storage space is allotted to the camera having a video quality that falls below the threshold value, and decreased storage space is allotted to at least one other camera.

Abstract: A method for training an alarm system to classify audio of an event, wherein the alarm system is connected to a neural network trained to classify audio as an event type, the method comprising the steps of: receiving audio recorded during a first period of time; transmitting the audio to an external unit; receiving data from the external unit indicating a sub-period of time of the audio and data indicating an event type of the indicated sub-period of time of the audio; and re-training the neural network by inputting a sub-period of the audio corresponding to the indicated sub-period of time of the audio and using the indicated event type as a correct classification of the sub-period of the audio.

Abstract: A method for streaming a live video stream in a system comprising a video camera generating the live video stream, a video recorder, and a video. The method comprises: at the video server, receiving, from a client device, a request for the live video stream from the video camera; transmitting from the video server, a push trigger to the video camera, the push trigger instructing the video camera to push the live video stream to the video recorder; upon receiving the push trigger, initiating a push of the live video stream from the video camera to the video recorder; pushing the live video stream from the video camera to the video recorder; pulling, by the video server, the live video stream from the video recorder; and transmitting, by the video server, the live video stream to the client device.

Abstract: A method and an apparatus for forming a video stream based on images of a scene captured by a camera. The method comprises: encoding image frames based on images captured by the camera, forming an encoded portion; determining a length of motion for a sample image frame, the length of motion being indicative of the amount of relative motion between the camera and the scene in the sample image frame relative a temporally preceding image frame; setting a motion length threshold based on a motion vector search range of the encoder; comparing the determined length of motion with the set motion length threshold; based on the outcome of the comparison, adjusting a chosen temporal frame distance of at least an adjustment portion (PA) of the video stream, wherein the adjustment portion is comprised in the encoded portion or in a temporally later encoded portion.

Abstract: A method for re-provisioning a user equipment (UE, 140) after a first digital security certificate for the UE (140) has expired includes communicating content data to a controller (130) over a first secure communication channel after verification of a validity of a first digital security certificate. Once it is realized the first digital security certificate has expired, the UE (140) sends a certificate provisioning request message over an unsecure channel to the controller (130) as a request to the controller (130) to provision a second digital security certificate. The UE (140) signs the certificate provisioning request message with the private key for the now expired first digital security certificate. A second digital security certificate is signed by the rescue-secret private key at the controller (130) and sent to the UE (140), which verifies its authenticity with the corresponding rescue-secret public key.

Abstract: A camera having a heating arrangement comprising a heater arranged to supply heat to a window. A thermally conductive member is arranged in contact with a housing and with the heating arrangement, when a temperature at the conductive member is below a threshold, to transfer heat supplied by the heater to the housing. A thermally insulating member is arranged in proximity with the housing and the heating arrangement. The conductive and/or insulating member is configured to, when the temperature increases above the threshold during heater operation, change its extension to enable contact between the insulating member and the housing and between the insulating member and the heating arrangement, and to disable contact between the conductive member and the housing and between the conductive member and the heating arrangement, thereby thermally insulate the housing from the heater.

Abstract: Methods for configuring a monitoring device to communicate with a service server are provided. The method includes the monitoring device sending a message including a code used for authentication of the monitoring device to a control server, receiving one or more addresses of a service server associated with the monitoring device from the control server in response to the monitoring device being authenticated by the control server, storing the one or more addresses retrieved by the control server, and establishing a connection between the monitoring device and the service server using at least one of the one or more addresses received from the control server.

Abstract: A method may include receiving a request to define a primary resource. The primary resource may enable access to a primary handler that corresponds to a logical entity that controls a device or a port or another resource. The method may include identifying a primary domain object for the primary resource. The primary domain object maps the primary resource to the primary handler. The primary domain object represents a state of the primary resource. The method may include identifying an interface for the primary resource. The interface may be configured to receive a command through a link from a client. The method may include receiving a state request associated with the interface for the primary resource, wherein the primary domain object handler is configured to send a state message indicating the state of the primary resource in response to the request.

Abstract: A video camera system comprises an imaging system having a camera lens and an image sensor, and a retractable IR-cut filter, and a control unit for controlling the imaging system. The video camera system has a day-mode in which the IR-cut filter is arranged in front of the image sensor, and a night-mode in which the IR-cut filter is retracted from its position in front of the image sensor. Furthermore, the video camera has a field of view defined by properties of its imaging system, and it comprises a separate light-sensor for measuring an ambient light level so as to support a decision regarding when to actuate a transfer from night-mode to day-mode, or vice versa. The camera system is characterized in that the separate light sensor has imaging optics and is enabled for a variable field of view, which is aligned with a field of view of the video camera system, and in that a current field of view of the video camera system is used when selecting an active field of view of the separate light sensor.

Abstract: An imaging system comprises at least three cameras having a common field of view, wherein each of the at least three cameras having a camera centre, and wherein the camera centres are positioned along a line, the at least three cameras being configured to: image a calibration object to generate a set of calibration object images, wherein the calibration object is located nearby the at least three cameras and in the common field of view, and image a scene comprising a set of distant scene position points to generate a set of position point images, and a processing unit configured to generate a set of calibration parameters in dependence on the set of calibration object images and the set of position point images.

Abstract: A camera arrangement comprises an optics unit and a sensor board with an image sensor attached to a first surface of the sensor board facing the optics unit. An alignment element formed by a thermoplastic material is fixedly attached to the optics unit, and a biasing element is configured to bias the alignment element into abutment with a contact area of the sensor board. A heating element is arranged in the contact area. Upon activation the heating element is configured to transfer heat to the alignment element, such that the alignment element is heated at least partly to a temperature of at least the glass transition temperature of the thermoplastic material, for enabling alignment of the sensor board relative the optics unit.

Abstract: Methods and apparatus, including computer program products, implementing and using techniques providing privacy masks on a video stream. In a video received from a monitoring camera, at least one image region is selected, to which region a privacy mask should be applied. For any image frame in the video that contains the at least one image region, a flag is set to indicate a non-displayed image frame. A forward-predicted image frame referencing the non-displayed image frame is inserted, wherein coding units representing the at least one image region in the forward-predicted image frame collectively provide the privacy mask by obfuscating the at least one image region.

Abstract: The present disclosure relates to a method performed by a people distinguishing system (1) for in an image distinguishing human beings in a crowd. The people distinguishing system identifies (1001) one or more detected objects classified as human beings (2) in an image (3) derived from a thermal camera (10) adapted to capture a scene in an essentially forward-looking angle. The people distinguishing system further identifies at least a first grouping (4) of adjoining pixels in the image, not comprised in the one or more detected human beings, having an intensity within a predeterminable intensity range. Moreover, the people distinguishing system determines (1003) a grouping pixel area (40) of the at least first grouping in the image. Furthermore, the people distinguishing system determines (1004) for at least a first vertical position (yexpected) in the image, based on head size reference data (5), an expected pixel area (xexpected) of a human head at the at least first vertical position.

Abstract: Encoding video data comprises receiving an image sequence comprising first and second input image frames, adding an overlay, thereby generating first and second generated image frames, and encoding a video stream containing output image frames with and without overlay. The first input image frame is encoded as an intra-frame to form a first output image frame. The second input image frame is encoded as an inter-frame with reference to the first output image frame to form a second output image frame. The generated image frames are encoded as inter-frames with reference to the first and second output image frames to form first and second overlaid output image frames. A first part of the second generated image frame is encoded with reference to the first overlaid output image frame, and a second part of the second generated image frame is encoded with reference to the second output image frame.

Abstract: An audio apparatus and a camera including the audio apparatus. The audio apparatus includes an audio transducer electronically connectable to a camera unit, and an audio transducer holder being mechanically connectable to the camera unit and having an audio transducer container being configured to receive the audio transducer and being provided with a spring element allowing the audio transducer to be pushed into the audio transducer container in a first direction and resiliently forcing the audio transducer outward relative to the audio transducer container such that, when the audio apparatus is installed in the camera and the camera is in an assembled state including the removable cover, the audio transducer is forced into abutment against an inside of the removable cover of the camera.

Abstract: Methods and apparatus, including computer program products, implementing and using techniques for reducing bitrate from a monitoring camera. A first input is received that identifies first regions of an image representing a camera field of view. The first regions contribute significantly to the bitrate. A second input is received that identifies second regions of the image. The second regions contain information that is deemed to be of little visual interest to a user of the monitoring camera. Third regions of the image are determined. The third regions are regions where the first and second regions overlap at least in part. Video encoder settings are applied to force skip blocks in at least some of the third regions, thereby reducing contributions to the bitrate from the third regions.