Axis Ab

Viktor Edpalm

Song Yuan

Xing Danielsson Fan

Axel Keskikangas

Fredrik Pihl

Alexander Toresson

Alexandre Martins

Lars Persson

Johan Palmaeus

Stefan Lundberg

Björn Ardö

Mattias Pettersson

Björn Benderius

Hampus Linse

Toivo Henningsson

Johan Förberg

Niklas Hansson

Sebastian Hultqvist

Niclas Svensson

Maya Shah

Henrik Eliasson

Jonas Cremon

Raphael Teller

Erik Andersson

Anton Eliasson

Bjarne Rosengren

Anton Öhrn

Jonas Holmberg

Adnan Saleem

Rodrigo Such

Xing Danielsson Fang

Viktors Jakovels

Andreas Irestål

Lars Branzén

Axel Jonsson

Jakob Antonsson

Fan Xing Danielsson

Viktor Yakovel

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.

Encoding of video stream during changing camera field-of-view

A method of encoding a video stream including an overlay is provided, including: capturing a first image; adding an overlay to the first image at a first position, and encoding the first image in a first frame of a video stream; capturing a second image of the scene; determining a desired position of the overlay in the second image; encoding the second image in a second frame marked as a no-display frame, and generating and encoding a third frame including temporally predicted macroblocks at the desired position of the overlay referencing the first frame with motion vectors based on a difference between the desired position and the first position, and skip-macroblocks outside of the desired position of the overlay referencing the first frame. A corresponding device, computer program and computer program product are also provided.

Video stream overlay encoding using no-display frames and motion vectors calculated based on known position-differences between frames

A method encodes image frames of an image stream and transmits encoded image frames on a communications network. The method includes receiving and then dividing an image frame into multiple slices defined by first slice parameters and second slice parameters. The method also includes prioritizing the multiple slices and then generating a first encoded image frame having first encoded slices, second encoded slices and one or more first skip blocks. The method then generates and transmits a second encoded image frame having further second encoded slices defined by the second slice parameters and based on encoding second slices and further first encoded slices defined by the first slice parameters with more second skip blocks.

Method and image-capturing device for encoding image frames of an image stream and transmitting encoded image frames on a communications network

A system and method trigger a second camera in a camera system to perform an action prior to an object appearing in the field of view of the second camera. The camera system includes the second camera for which a location and a field of view is known, and at least a first device for which a location is known. The method comprises receiving, in the second camera, information indicating that the object is approaching the field of view of the second camera. The received information indicates a location and a direction of movement of the object, and, in response to the received information, triggers the second camera to action prior to the object appearing in the field of view of the second camera by: generating an intra frame or initiating an intra refresh procedure, adjusting one or more image processing parameters, or adjusting an exposure time.

Camera information handover

An encoding device and a method for encoding an image frame comprising a plurality of pixel blocks are provided. A respective offset compression value is set for each of the plurality of pixel blocks based on an interest level associated with the pixel block, wherein each offset compression value defines an offset in relation to a reference compression value set for the image frame. In the image frame, one or more low contrast regions having a contrast which is below a predefined contrast threshold are identified. For pixel blocks within the one or more low contrast regions having set offset compression values based on the associated interest levels higher than a predefined offset compression threshold, the set offset compression values are selectively restricted to be at most equal to the predefined offset compression threshold. The image frame is then encoded using the set offset compression values.

Encoding device and a method for encoding an image frame including selective restriction of offset compression values

A method of encoding an image comprises establishing whether objects constituting one or more predefined object types or performing one or more predefined event types are visible in the image; in response to establishing that the objects are visible, encoding at least one region-of-interest of the image using a non-generative image model, thereby obtaining first image data; and encoding any remainder of the image using a generative image model, thereby obtaining second image data, wherein use of the non-generative image model enables decoding of the first image data without relying on information derived from images other than the encoded image or, if the image is a frame in a video sequence, enables decoding of the first image data without relying on information derived from images outside the video sequence.

System and method for image coding using dual image models

A and method encode a view area within a current image frame of a video into an encoded video area frame. The view area is a respective subarea of each image frame, each image frame comprising first and second image portions, and between previous and current image frames, the view area moves across a boundary between the first and second image portions. First and second encoders are encode image data of the first and second image portions, respectively. First, second and third portions of the view area are identified based on their respective location in the previous and current image frames. Image data of the first and third portions are inter-coded as first and third encoded slices/tiles. Image data of the second portion of the view area in the current image frame are intra-coded as a second encoded slice/tile. The encoded slices/tiles are merged into the encoded video area frame.

Image processing device and a method for encoding a view area within an image frame of a video into an encoded video area frame

A method of failover recording of video streams in a camera connectable to a receiver device over a communication network, the method comprising: detecting that a bandwidth of a connection over the communication network is insufficient for transmitting a video stream at a predetermined bitrate, generating multiple parallel encoded video streams with different bitrates, storing the multiple parallel encoded video streams on a memory storage accessible to the camera, detecting that the memory storage usage of the memory storage exceeds a storage threshold, discontinuing the storing of one of the multiple encoded video streams being the encoded video stream that provides the highest bitrate among the multiple encoded video streams, and discarding the one of the multiple encoded video streams from the memory storage.

Video failover recording

An image processing device, a camera system, a non-transitory computer-readable storage medium, and methods for encoding two video image frames captured by one of two image sensors, wherein each of the video image frames depicts a respective portion of a scene. A respective overlapping area is identified in each of the video image frames, which overlapping areas both depict a same sub-portion of the scene, and a video image frame of the video image frames is selected. Compression levels are then set for the image frames, wherein respective compression levels are set for pixel blocks in the selected video image frame based on a given principle. Respective compression levels for pixel blocks in the overlapping area in the selected video image frame are selectively set higher or lower than respective compression levels that would have been set based on the given principle. The video image frames are then encoded.

Camera system and method for encoding two video image frames captured by a respective one of two image sensors

An image processing device, a non-transitory computer-readable storage medium and a method for dividing an array of pixels into slices and tiles, and a system for encoding the slices and tiles into a video stream by means of a first encoder arranged in a first image processing circuitry and a second encoder arranged in a second image processing circuitry are disclosed. The array of pixels consists of a first subset of pixels having pixel data stored in a first buffer arranged in the first image processing circuitry and a second subset of pixels having pixel data stored in a second buffer arranged in the second image processing circuitry, wherein a first border between the first subset of pixels and the second subset of pixels is tilted at a tilt angle in relation to the array of pixels. The array of pixels is divided into two or more slices, and each slice is divided into two or more tiles. The two or more tiles of each slice consists of a first subset of tiles and a second subset of tiles, wherein the first subset of tiles and the second subset of tiles are disjunct and the first subset of tiles is to be encoded by the first encoder and the second subset of tiles is to be encoded by the second encoder. Dividing each slice into two or more tiles comprises setting a second border between the first subset of tiles and the second subset of tiles at an offset between two adjacent slices of the two or more slices, wherein the offset is based on the tilt angle.

Method, an image processing device for dividing an array of pixels into slices and tiles, and a system for encoding the slices and tiles into a video stream

A device, and method of signing a video segment comprising one or more groups of pictures, GOPs, wherein each GOP comprises a header and one or more frames, are disclosed. For each of the one or more GOPs a GOP hash is produced and the GOP hash is digitally signed by means of a digital signature to produce a signed GOP hash. For each GOP except a last GOP of the one or more GOPs the respective signed GOP hash is saved in the header of a subsequent GOP. An additional GOP is added to the video segment after the last GOP of the one or more GOPs, wherein the additional GOP comprising a header and one or more frames. The signed GOP hash of the last GOP of the one or more GOPs is saved in the header of the additional GOP.

Device and a method for signing a video segment comprising one or more groups of pictures

A method of providing an event-initiated video sequence, comprises a pre-event video sequence and a post-event video sequence. The pre-event image frames are stored in a non-processed format until such time that an event is taking place. By postponing the image processing of the pre-event video sequence, power savings are accomplished.

Event video sequences

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.

Alert generation based on event detection in a video feed

A method for controlling video processing. A stream of images emanating from an image sensor is received. The contents of an image in the stream is evaluated. A part of the image stream, which part is antecedent the image being evaluated, is forwarded to a video encoder. Until the evaluation is complete, one or more empty frames are added at the end of an encoded image stream corresponding to the forwarded image stream.

Method and image-processing device for video processing

Methods and apparatus, including computer program products, for processing a stream of image frames captured by a camera system. When an image frame from the stream of image frames is dropped, a current camera movement is determined. A substitute image frame for the dropped image frame is generated. The substitute image frame comprises a reference to a previous image frame and includes one or more motion vectors estimated solely based on the determined current camera movement. Remaining image frames in the stream of image frames are encoded and the substitute image frame is inserted at the place of the dropped image frame in the stream of encoded image frames.

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Lund, Sweden

Viktor Edpalm