Axis Ab

Fredrik Pihl

Viktor Edpalm

Xing Danielsson Fan

Mattias Pettersson

Björn Ardö

Alexandre Martins

Lars Persson

Björn Benderius

Niclas Svensson

Henrik Eliasson

Mats Lund

Alexander Toresson

Viktor A Andersson

Anton Öhrn

Adam Schill Collberg

Malte Johansson

Maya Shah

Xing Danielsson Fang

Magnus Söderdahl

Peter Wilhelmsson

The present invention relates to the field of video encoding. In particular, it relates to a methodof encoding images captured by a camera and to an image processing device. An image sequence captured with an image sensor of the camera is obtained S, and an oscillation frequency of a periodic movement of the camera during capturing of the image sequence is determined S. A base subset of images of the image sequence corresponding to the oscillation frequency is identified Sand the base subset of images are encoded Sinto an encoded video stream comprising intra frames and inter frames.

Image processing device and a method for encoding images captured by a camera

An image processing device, a non-transitory computer readable storage medium, a monitoring cameraand a methodof pre-processing images of a video stream before encoding the video stream are disclosed. The images are obtained S, wherein the obtained images have a first resolution. The obtained images are subsampled Sto intermediate images having a second resolution lower than the first resolution and lower than a third resolution. The intermediate images are upsampled Sto output images having the third resolution, wherein the third resolution is the same for all images of the video stream.

Image processing device and method of pre-processing images of a video stream before encoding

A method and wearable camera for encoding video captured by a wearable camera determines a centre of rotation for an image frame to be encoded. The centre of rotation relates to a rotation of the wearable camera at the time of capturing the video and the image frame comprises multiple groups of pixels. Furthermore, compression levels are set for the multiple groups of pixels of the image frame. The compression levels for the multiple groups of pixels of the image frame are set such that a level of compression increases with a radial distance from the centre of rotation. The image frame is encoded using the compression levels.

Wearable camera and a method for encoding video captured by the wearable camera

There is provided an image pipeline and a method therein for intra-coding an image frame. The image pipeline comprises a processing part followed by an encoding part supporting a plurality of intra-prediction modes used for intra-coding image frames. The method comprises receiving an image frame and for at least one block of pixel values in the image frame: predicting pixel values of the at least one block of pixel values using an intra-prediction mode supported by the encoding part and updating the image frame by adjusting at least one pixel value within the at least one block of pixel values so as to reduce a residual between the at least one pixel value and a corresponding predicted pixel value. Further, the method comprises intra-coding the updated image frame using at least one out of the plurality of intra-prediction modes.

Method and device for intra-coding an image frame

An image processing device, a camera and a method of encoding a sequence of video images into a single video stream with dynamic bitrate are provided. The sequence of video images is encoded into frames of a base layer of the single video stream using a base layer resolution and a base layer compression level. Video images of the sequence of video images corresponding to respective times before detecting an event trigger are encoded into a first set of frames of an extended layer of the single video stream. The event trigger is detected and upon detecting the event trigger, video images of the sequence of video images corresponding to respective times after detecting the event trigger are encoded into a second set of frames of the extended layer using a higher resolution than the base layer resolution or a lower compression level than the base layer compression level.

Image processing device, a camera and a method for encoding a sequence of video images

A method of encoding a video sequence by an encoder supporting context-based adaptive binary arithmetic coding, CABAC is disclosed. The method comprises determining, by a rate controller, a compression parameter of the encoder based on a load parameter value, indicating a current actual load of the coding block, received from the coding block.

Method of encoding a video sequence

Video encoding, and specifically to a method and an encoder which can adapt the probability of intra refresh of image frame subdivisions based on a count of image frames since a previous refresh and modulated through convex or concave shaped distribution functions are set forth herein.

Method for intra refresh encoding of a plurality of image frames using convex and concave distribution functions

A method of adding comfort noise to a video sequence comprising setting parameters of a deblocking filter of a video encoder to change values during the video sequence, encoding frames of the video sequence using the parameters of the deblocking filter that are set to change values during the video sequence, thereby introducing comfort noise in the video sequence, and including the encoded frames in a bitstream together with an indication of which parameters of the deblocking filter were used when encoding the frames of the video sequence.

Method and a controller for adding comfort noise to a video sequence

The present invention relates to a system and a method for encoding a video stream. The encoding includes determining a level of relevance for areas in an image frame to be included in the video stream, determining a block size value for coding blocks in the image frame, the block size value is depending on the level of relevance determined for the area including each coding block, respectively, encoding the image frame using coding block sizes based on the determined block size values for each of the coding blocks.

Video encoding method and system

A method and system for monitoring video data based on gaze is disclosed. The method may include receiving a video stream generated by a camera and presenting the received video stream on a display. The method may further include receiving a notification signal triggered by an event and determining that the video stream is associated with the notification signal. The method may further include detecting a gaze point of an operator viewing the display and determining at least one parameter associated with the gaze point. The method may include controlling a state of an alarm associated with the notification signal based upon the at least one parameter associated with the gaze point.

Alarm masking based on gaze in video management system

A method for controlling a video camera which is configured to capture and process image frames prior to encoding. The method comprises determining whether the video camera is going to encode an image frame as an intra-frame or an inter-frame. If the image frame is going to be encoded as an inter-frame, the video camera is controlled to capture and process the image frame using first settings prior to encoding. If the image frame is going to be encoded as an intra-frame, the video camera is controlled to capture and process the image frame using second settings prior to encoding, wherein the second settings are modified in relation to the first settings to further reduce a level of noise in the image frame.

Controller, video camera, and method for controlling a video camera

A method of encoding a video stream comprising receiving a frame of a video stream to be encoded, performing motion detection in the frame to identify steady regions, and temporally filtering the frame so as to provide temporally filtered pixel values. For a pixel in the steady regions of the frame, the temporally filtered pixel value is used when encoding the pixel, on a condition that the pixel belongs to a block of pixels of the frame that will be intra-coded. On a condition that the pixel instead belongs to a block of pixels of the frame that will be inter-coded, a value that was used when encoding a corresponding pixel of the immediately preceding frame is used when encoding the pixel.

Method, a video encoder, and a video camera for encoding a video stream

A method of encoding digital video data corresponding to a sequence of input video frames is disclosed. The input video frames are encoded into a sequence of output video frames. The method comprises encoding a first input video frame in a first encoder instance using intra-frame encoding to produce a first intra-frame, decoding the first intra-frame to produce a first decoded frame, encoding the first decoded frame in a second encoder instance to produce a first output video frame. A digital video encoding system is also disclosed, as well as a camera comprising such a system, and a computer program product for performing the method.

Video encoding method and video encoder system

A method decodes video data based on gaze sensing. The method may decode an encoded video stream received from an encoder associated with a camera, and present the decoded video stream on a display of a device. The method may further detect a gaze point of an operator viewing the display, designate locations associated with the decoded video stream, based upon the gaze point, as skip block insertion points. The method may send the locations to the encoder, wherein the encoder reduces an update rate of inter-frame coded blocks corresponding to the skip block insertion points when encoding video data produced by the camera. An apparatus can implement the method to decode video data based on gaze sensing.

Block level update rate control based on gaze sensing

A method and a video management system is disclosed. The method may include receiving a video stream from a camera and displaying the video stream on a display. The method may include obtaining, via an eye tracking sensor, gaze information for an operator watching the display. The method may include generating a historical gaze heat map for the video stream for a time period based on the obtained gaze information and determining a low interest area for the video stream based on the generated historical gaze heat map. The method may include instructing the camera to decrease a bit rate of the video stream in the low interest area.

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Lund, Sweden

Fredrik Pihl