公开(公告)号：US20190200014A1

公开(公告)日：2019-06-27

申请号：US16224104

申请日：2018-12-18

Applicant: Axis AB

Inventor： Alexander Toresson ,  Viktor Edpalm ,  Fredrik Pihl

IPC: H04N19/117 ,  H04N19/86 ,  H04N19/177 ,  H04N19/196 ,  H04N19/139 ,  H04N19/567

CPC classification number: H04N19/117 ,  H04N19/136 ,  H04N19/139 ,  H04N19/146 ,  H04N19/172 ,  H04N19/177 ,  H04N19/196 ,  H04N19/46 ,  H04N19/567 ,  H04N19/82 ,  H04N19/86

Abstract: 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.

公开(公告)号：US10123020B2

公开(公告)日：2018-11-06

申请号：US15395790

申请日：2016-12-30

Applicant: Axis AB

Inventor： Bjorn Ardo ,  Fredrik Pihl

IPC: H04N7/12 ,  H04N11/02 ,  H04N19/146 ,  H04N19/132 ,  H04N19/159 ,  H04N19/46 ,  G06F3/01 ,  H04N19/177 ,  H04N19/167 ,  H04N19/182 ,  H04N19/184

Abstract: 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.

公开(公告)号：US10110802B2

公开(公告)日：2018-10-23

申请号：US15395893

申请日：2016-12-30

Applicant: Axis AB

Inventor： Bjorn Ardo ,  Fredrik Pihl

IPC: H04N5/228 ,  H04N5/232 ,  G06F3/01 ,  G06K9/00

Abstract: 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.

公开(公告)号：US11750798B2

公开(公告)日：2023-09-05

申请号：US17495839

申请日：2021-10-07

Applicant: Axis AB

Inventor： Fredrik Pihl ,  Mattias Pettersson

IPC: H04N19/105 ,  H04N19/146 ,  H04N19/159 ,  H04N19/176 ,  H04N23/68

CPC classification number: H04N19/105 ,  H04N19/146 ,  H04N19/159 ,  H04N19/176 ,  H04N23/6812

Abstract: The present invention relates to the field of video encoding. In particular, it relates to a method 300 of 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 S310, and an oscillation frequency of a periodic movement of the camera during capturing of the image sequence is determined S320. A base subset of images of the image sequence corresponding to the oscillation frequency is identified S330 and the base subset of images are encoded S340 into an encoded video stream comprising intra frames and inter frames.

公开(公告)号：US11683595B2

公开(公告)日：2023-06-20

申请号：US17370141

申请日：2021-07-08

Applicant: Axis AB

Inventor： Fredrik Pihl ,  Mattias Pettersson

IPC: H04N5/232 ,  H04N7/18 ,  H04N19/167 ,  H04N19/182 ,  H04N19/139 ,  H04N23/80 ,  H04N19/102 ,  H04N19/134 ,  H04N19/61 ,  H04N19/169 ,  H04N19/25 ,  H04N19/48 ,  H04N101/00

CPC classification number: H04N23/80 ,  H04N7/185 ,  H04N19/102 ,  H04N19/134 ,  H04N19/139 ,  H04N19/167 ,  H04N19/182 ,  H04N19/61 ,  H04N19/169 ,  H04N19/25 ,  H04N19/48 ,  H04N2101/00

Abstract: 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.

公开(公告)号：US10652538B2

公开(公告)日：2020-05-12

申请号：US16199225

申请日：2018-11-26

Applicant: Axis AB

Inventor： Fredrik Pihl ,  Xing Danielsson Fan

IPC: H04N19/122 ,  H04N19/154 ,  H04N19/136 ,  H04N19/176 ,  H04N19/137 ,  H04N19/172 ,  H04N19/119 ,  H04N19/174

Abstract: 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.

公开(公告)号：US10531001B2

公开(公告)日：2020-01-07

申请号：US15928722

申请日：2018-03-22

Applicant: Axis AB

Inventor： Fredrik Pihl ,  Xing Danielsson Fan ,  Björn Benderius ,  Viktor Edpalm ,  Niclas Svensson ,  Henrik Eliasson

IPC: H04N5/232 ,  H04N19/139 ,  H04N19/105 ,  H04N19/177 ,  H04N19/154 ,  H04N5/243

Abstract: 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.

公开(公告)号：US10341675B2

公开(公告)日：2019-07-02

申请号：US15412603

申请日：2017-01-23

Applicant: Axis AB

Inventor： Fredrik Pihl ,  Mats Lund

IPC: H04N19/436 ,  H04N19/105 ,  H04N19/159 ,  H04N19/107 ,  H04N19/154 ,  H04N19/194 ,  H04N19/86 ,  H04N19/172 ,  H04N19/176

Abstract: 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.

公开(公告)号：US20180278953A1

公开(公告)日：2018-09-27

申请号：US15928798

申请日：2018-03-22

Applicant: Axis AB

Inventor： Anton Öhrn ,  Viktor Edpalm ,  Henrik Eliasson ,  Björn Benderius ,  Niclas Svensson ,  Xing Danielsson Fan ,  Fredrik Pihl

IPC: H04N19/55 ,  H04N19/182 ,  H04N19/593

CPC classification number: H04N19/55 ,  H04N19/117 ,  H04N19/137 ,  H04N19/159 ,  H04N19/176 ,  H04N19/182 ,  H04N19/503 ,  H04N19/593

Abstract: 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.

公开(公告)号：US20180191952A1

公开(公告)日：2018-07-05

申请号：US15395893

申请日：2016-12-30

Applicant: Axis AB

Inventor： Bjorn Ardo ,  Fredrik Pihl

IPC: H04N5/232 ,  G06F3/01 ,  G06K9/00

CPC classification number: H04N5/23219 ,  G06F3/013 ,  G06K9/00604 ,  H04N5/23229 ,  H04N5/23293 ,  H04N21/2187 ,  H04N21/2662 ,  H04N21/4223 ,  H04N21/44218

Abstract: 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.