Abstract: A device and a method mask an object in a video stream. The camera is arranged in a system including the camera and another device. A location and field of view is known for the device and the camera. Furthermore, the field of view of the device and the camera are non-overlapping. Information indicating that an object is approaching the field of view of the camera is obtained. The obtained information is determined from the device indicating a location and a direction of movement of the object and the known locations and fields of view of the camera and the device. In response to the information, a threshold for detecting objects to be masked in the video stream captured by the camera is reduced. An object to be masked in the video stream is detected using the reduced threshold, and masking of the object in the video stream is inserted.

Abstract: A dome camera arrangement comprises one or more camera heads arranged in a transparent dome Each camera head comprises an optics unit, a panning device and a tilting device for moving the camera head in panning and tilting movements, respectively. The tilting device has a pivot portion and a cradle portion. The camera head further has a roll device for rotating the optics unit in a roll movement. A compensation lens is arranged in a compensation lens fitting in front of the optics unit, and the compensation lens fitting is connected to the panning and tilting device, such that the compensation lens will move with the camera head in panning and tilting movements. However, the compensation lens fitting is disconnected from the same features such that the compensation lens will not follow the optics unit in roll movement, thus enabling an adequate optical compensation by the compensation lens.

Abstract: A method , software and device for encoding a video sequence into an encoded video stream having a target resolution, comprises: encoding a first image frame of the video sequence using the base layer to encode the image frame in a first resolution being lower than the target resolution, and using the enhancement layer to encode at least a portion of image data of the first image frame to reach the target resolution; detecting an encoding scenario from a set of one or more predefined encoding scenarios; and encoding a second image frame of the video sequence using the base layer to encode the second image frame in the target resolution, and indicating in the encoded video stream that the second image frame is decodable in the target resolution using only the base layer.

Abstract: A method and device are provided for stitching images and blending pixel data from at least three image sensors while an object moves through their combined field of view. The combined view includes a first region where the views of at least three sensors overlap and through which the object’s track passes. The method includes obtaining time-synchronized image sequences from each sensor, detecting the object in the combined view, determining its location, and predicting its track. Based on the predicted track, a minimal set of sensor views that fully covers the track is identified. Images captured at the same time from sensors in this minimal view set are stitched and blended to form a combined image. In most of the portion of the combined image corresponding to the overlapping region, pixel blending uses data from no more than two sensors at any location.

Abstract: A computer-implemented method for enabling video recreation, comprising: acquiring, by a camera control unit, a video stream comprising a set of image data packages each comprising coded image frames; transmitting, by the control unit, at least a portion of the video stream to a client across a communication network, receiving, by the control unit, an acknowledgement message for each image data package that was successfully received by the client, storing, in a digital memory accessible to the control unit, the image data packages for which an acknowledgement message is received, and indications of successful receipt at the client of the corresponding image data packages.

Abstract: Methods, software, devices and systems encode an image frame in a video stream, such that a decoded version of the encoded image frame is provided with a first masked region. A block-aligned mask is applied to the image frame being encoded, and a pre-generated encoded image frame is used to transform the block-aligned masked region during decoding. The pre-generated encoded image frame contains motion vectors but no residual data, enabling efficient transformation of a block-aligned masked region into the first masked region with an edge that cuts across coding blocks.

Abstract: A tracked state of a tracked object in a sequence of images is determined. A region of interest (ROI) is defined in the current image. Based on at least one previous image in the sequence, motion information from the current image is aggregated to estimate the current motion of the ROI. A predicted current state of the ROI is predicted, based on a previous state of the ROI, a plurality of object tracking models, and the estimated current motion of the ROI. The predicting comprises selecting at least one of the plurality of object tracking models to be used for predicting the predicted current state. The predicted current state of the ROI is associated with the observed current state of the ROI to determine the tracked state of the tracked object.

Abstract: A method, system and software for searching for an object in a forensic search application comprises: determining a plurality of static areas in the scene; obtaining a first image depicting the scene comprising an object; determining a plurality of candidate color transforms; determining a plurality of candidate color values of the object by applying each of the plurality of candidate color transform to third pixel data from the first image, said third pixel data depicting the object in the first image; searching for an object in a forensic search application using a search request comprising a first color value; determining that the first color value matches one or more candidate color values; and returning a search response based at least in part on the object.

Abstract: Signing of an encoded video stream using a first device and second device, wherein the first device provides the original signatures of a first encoded video stream, wherein the second device applies video processing to the first encoded video stream to modify the image frames thereof and include the modified image frames into a second encoded video stream. The second device determines difference data corresponding to the video processing and includes the difference data in the second encoded video stream. On a decoder side, the decoder can authenticate the received second encoded video stream by validating the original signatures using the difference data.

Abstract: A computer-implemented method of controlling a computing hardware accelerator in a movable camera comprises: acquiring images from the movable camera; obtaining an indication of a physical state of the movable camera, indicating whether the movable camera is in a moving state or in a still state; and allocating exclusive access to the computing hardware accelerator based on the indication of the physical state. The disclosure further relates to a camera system for carrying out the computer-implemented method of controlling a computing hardware accelerator in a movable camera.

Abstract: A method, a device and a non-transitory computer-readable storage medium for setting a confidence threshold for objects detected in a region of a captured scene based on historical confidence scores for objects detected in that region.

Abstract: An arrangement for attachment of devices to a surface, such as a wall, comprises at least one device, and for each device, at least two mounting brackets. Each device has a rear side provided with a recess for each mounting bracket, wherein each mounting bracket has a male connector end and a female connector end, the male connector end being configured to be received by the female connector end of an adjoining mounting bracket associated to a neighbouring device. Each male connector end is provided with a through hole for receiving an attachment means, such as a screw. Each mounting bracket is insertable into its associated recess with an orientation in which the male connector end extends beyond a periphery of the device, and each mounting bracket is insertable into its associated recess with an orientation in which the female connector end is accessible from the periphery of the device.

Abstract: A method of providing anonymized data for facilitating reidentification in a visual tracking system, the method comprising: detecting, in images obtained from a plurality of image sources, subareas which each contain a tracking target; computing, for each subarea, a feature vector which represents a visual appearance of the tracking target therein; for a first/second subgroup of the image sources, providing first/second reidentification data items by anonymizing each feature vector using a predefined one-way function modified by a first/second tracking-rights token, and disclosing the first/second reidentification data items annotated with locations of the respective subareas to a first/second tracking client, wherein the second tracking-rights token is distinct from the first tracking-rights token; and preventing access to the feature vectors.