Abstract: A method of masking in an output image stream includes receiving an input image stream capturing a scene, processing the input image stream to generate the output image stream, including using a detector to detect objects in the scene and a tracker to track objects in the scene based on information provided by the detector, and further including to generate a particular output image of the output image stream by checking whether there exists a particular area in the scene in which an evaluation of a historical performance of the detector and/or tracker fulfills at least one condition, and to, if confirming that such a particular area exists, mask the particular area of the scene in the particular output image. A corresponding device, computer program, and computer program product are also provided.

Abstract: There is provided techniques for setting frame rates of a camera. The camera comprises a plurality of image sensors arranged to capture images to be stitched into a panorama image of a scene. Information of a respective angle between the optical axis of each of the plurality of image sensors and a direction along which a straight path structure, to be monitored by the camera, extends through the scene is obtained. The plurality of image sensors are divided into at least two groups as a function of the angles. All the angles of the image sensors within each of the at least two groups are part of its own continuous angle interval. One frame rate is set per each of the at least two groups. The frame rate decreases from the group with highest continuous angle interval towards the group with lowest continuous angle interval.

Abstract: A method of encoding a video stream is provided, including obtaining a first image with a first FOV; encoding the first image as part of a first encoded video frame; obtaining a second image with a second FOV different from the first FOV; generating a first additional video frame referencing the first video frame, including motion vectors transforming image content of the first image to a FOV closer to the second FOV than the first FOV, wherein the motion vectors are formed based on a difference between the first and second FOVs; inserting the first additional video frame into the encoded video stream as a no-display frame, and encoding the second image as part of a second video frame of the encoded video stream referencing the first additional video frame. A corresponding device, computer program and computer program product are also provided.

Abstract: A power sourcing equipment (PSE) device for controlling delivery of electric power to a powered device (PD) connected to the PSE device comprises a first input port for reception of input data and electric power from a power over Ethernet (PoE) device such as a PoE switch, a second input port for reception of electric power from a power source other than the PoE device and an output port for provision of the input data received at the first input port and the electric power received at the second input port to the PD. The PSE device further comprises control circuitry that is configured to determine a discontinuation of reception of electric power from the PoE device and configured to, in response to a determination of a discontinuation of reception of electric power from the PoE device, control discontinuation of provision of the electric power to the PD.

Abstract: An image-processing device generates a three-dimensional model of a background scene of the image frame based on three-dimensional information about the background scene. The image-processing device defines a three-dimensional bounding box of the object in the three-dimensional model. The image-processing device defines a centre coordinate in the three-dimensional model and a colour value of surface elements of the three-dimensional bounding box. The image-processing device determines a three-dimensional coordinate of a surface in the three-dimensional model which reflects light from a surface element into the camera, by tracing rays from the centre coordinate and based on a normal of the surface. The image-processing device further identifies a first pixel in the image frame corresponding to the three-dimensional coordinate and detects the reflection of the object.

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 method for controlling the output power of power sourcing equipment powering a device through an ethernet cable, comprising: performing a power negotiation between the power sourcing equipment and the powered device, the negotiation comprising establishing a relation between an output voltage of the power sourcing equipment and a loop current from the powered device to the power sourcing equipment by measuring the loop current in a current-sensing device; obtaining indications of whether the powered device needs increased power and whether the power sourcing equipment is able to deliver increased power; if the powered device needs increased power and the power sourcing equipment is of a power sourcing equipment type able to deliver increased power, physically manipulating the current-sensing device such that it senses a manipulated lower loop current; and providing a manipulated higher output power from the power sourcing equipment to the powered device.

Abstract: A method and device for communicating video for synchronization between a portable wearable camera and a wireless hub device are described. The portable wearable camera may capture first video data. Also, the portable wearable camera may transmit the first video data to the wireless hub device via a video data channel, and may capture second video data. When the video data channel between the wearable camera and the wireless hub device is unable to support full resolution video playback, the portable wearable camera may store the second video data. Further, the portable wearable camera may receive a request via a control channel, from the wireless hub device, for the second video data, and may capture third video data. Further, the portable wearable camera may transmit, to the wireless hub device, the third video data via the video data channel and the second video data via the control channel.

Abstract: A method of providing a signed bitstream, performed in association with a process of capturing an audio signal and encoding it as a bitstream, which includes a sequence of data units representing time segments of the audio signal. The method comprises: assigning a score to each data unit; monitoring an accumulated score of data units back to a reference point; when the accumulated score reaches a threshold, inserting into the bitstream a signature unit including a digital signature of fingerprints of a subsequence of the data units back to the reference point; and resetting the reference point. The score is based on a) a detected content of the time segment of the audio signal corresponding to the data unit, b) contextual information relating the time segment to a history of the audio signal, and/or c) information relating to the conditions of capturing the time segment.

Abstract: Methods, systems and computer program products, for processing a stream of image frames captured by a camera system. A hardcoded alert image frame is generated in response to detecting an event. The hardcoded alert image frame includes motion deltas and/or color changes with respect to an event image frame. A stream of encoded image frames is generated, in which stream the hardcoded alert image frame is inserted in display order after the encoded event image frame.

Abstract: An image processing device a camera and a method for of encoding images captured by a camera are disclosed. For each image of an image sequence captured by the camera, the image is pre-processed by filtering the image by applying a privacy filter, the privacy filter being configured to distort the image in such a way that privacy is achieved in the filtered image, and, for at least a subset of the filtered images, by colour revising the filtered image by changing colour of pixels of a plurality of scattered areas of the filtered image such that a respective colour of one or more pixels of each area of the plurality of scattered areas represents one or more original colours of one or more pixels before filtering at a location of that area in the filtered image. The pre-processed images are then encoded into an encoded video stream.

Abstract: A method of object re-identification in images of objects comprises providing a plurality of neural networks for object re-identification, wherein each of the plurality of neural networks is trained on image data with different sets of anatomical features, each set being represented by a reference vector; receiving a plurality of images of objects and an input vector representing anatomical features that are depicted in all of the plurality of images; comparing the input vector with the reference vectors for determining, according to a predefined condition, the most similar reference vector; and inputting image data of the plurality of objects to the neural network represented by the most similar reference vector for determining whether the plurality of objects have the same identity.

Abstract: A method for selecting a crop score threshold for enhancing tracking of objects in a scene captured in a video sequence is disclosed. A respective track is obtained for two different objects, each track comprising crops of object instances of the objects in in a video sequence, each crop having a crop score and a feature vector. Each track is split into respective more tracklets thereby forming four or more tracklets. For each candidate crop score threshold a respective difference between each tracklet and each other tracklet is determined based on differences between feature vectors of crops having a crop score above the candidate crop score threshold of each tracklet, and each other tracklet. A crop score threshold is selected from the set of crop score thresholds resulting in a maximum difference between the differences between tracklets of different tracks and the differences between tracklets of the same track.

Abstract: A computer-implemented method in a processor device of a camera, the method comprising: acquiring image frames comprising video data, communicating with a receiver device for continuously transmitting a video stream to the receiver device over a communication network; detecting at least one object in the image frames of the video data, the detected at least one object belong to at least one predetermined object class selected as surveillance target; cropping sub-areas in the image frames of the video data, the sub-areas including the at least one detected object, and adding the cropped sub-areas to image frames of the video stream being continuously transmitted as a single video stream to the receiver device.

Abstract: A method for determining a status of a microphone comprises inducing a piezoelectric component, located in a vicinity of and in mechanical connection with the microphone, to emit a predetermined impulse waveform; determining whether a response signal waveform from the microphone corresponds to the predetermined impulse waveform; and upon the response signal waveform from the microphone corresponding to the predetermined impulse waveform, determining that the status of the microphone is operational.

Abstract: A system and a method for visualizing movement of a detected object in a scene are disclosed. For each image of a sequence of images captured by a camera and depicting the scene: information is obtained indicating a location in horizontal direction in the image of the detected object, and a graphical shape is displayed on a display in a 2-dimensional graphical representation of a field of view of the camera in a horizontal plane, wherein the graphical shape has a location in the 2-dimensional graphical representation representing the location in horizontal direction in the image of the detected object.

Abstract: A method for fusing a primary image (P) and a secondary image (S) into a target image comprises determining a local noise level of a region of the primary image; deriving a low-frequency, LF, component (PLF) from said region of the primary image and a high-frequency, HF, component (SHF) from a corresponding region of the secondary image, wherein the LF and HF components refer to a common cut-off frequency; combining the LF component and the HF component into a target image region, wherein the HF component's relative contribution to the target image region increases gradually with the local noise level; and repeating the preceding operations and merging all output target image regions thus obtained into the target image. A system implementing said method is also provided.

Abstract: A method for encoding an image frame, performed by an image processing device, comprising obtaining image data, and identifying an image area in an image frame based on that the image area fulfilling an identification criterion. The method further comprises determining a bit depth reduction factor for the identified image area by analyzing the image data in the identified image area, and replacing some of the bit values of the pixel values in the identified image area with dummy values. How many of the bit values that are replaced with dummy values is defined by the bit depth reduction factor. The method comprises encoding the image frame upon said some of the bit values having been replaced in the identified image area.