公开(公告)号：US20220329717A1

公开(公告)日：2022-10-13

申请号：US17682435

申请日：2022-02-28

Applicant: Axis AB

Inventor： Viktor EDPALM ,  Andreas IRESTÅL

IPC: H04N5/235 ,  H04N5/225

Abstract: An exposure time controller for controlling an exposure time (ET) variable of a video camera, which is associated with an auto-exposure algorithm configured to reduce an exposure mismatch (ΔE) by incrementing and decrementing the ET variable, which comprises: a memory for recording ET values applied while the video camera is imaging a scene and the algorithm is active; and processing circuitry configured to: determine that the exposure mismatch exceeds a threshold while the video camera is imaging the scene; estimate a distribution of the recorded ET values; based on the estimated distribution, identify multiple relatively most frequent ET values; and, in reaction to determining that the exposure mismatch exceeds the threshold, assign one of the identified ET values to the ET variable.

公开(公告)号：US20220286621A1

公开(公告)日：2022-09-08

申请号：US17570774

申请日：2022-01-07

Applicant: Axis AB

Inventor： Axel KESKIKANGAS ,  Viktor EDPALM ,  Mattias PETTERSSON

IPC: H04N5/232 ,  G06V20/40 ,  G11B20/10 ,  G06T5/00 ,  G11B27/028

Abstract: 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.

公开(公告)号：US20220138468A1

公开(公告)日：2022-05-05

申请号：US17498764

申请日：2021-10-12

Applicant: Axis AB

Inventor： Viktor EDPALM ,  Song YUAN ,  Raphael TELLER

IPC: G06K9/00 ,  H04N19/85 ,  H04N19/105 ,  H04N19/46 ,  H04N19/172

Abstract: 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.

公开(公告)号：US20220086450A1

公开(公告)日：2022-03-17

申请号：US17398658

申请日：2021-08-10

Applicant: Axis AB

Inventor： Sebastian HULTQVIST ,  Viktor EDPALM ,  Axel KESKIKANGAS ,  Anton ELIASSON

IPC: H04N19/137 ,  H04N19/114 ,  H04N19/159 ,  G06K9/00 ,  H04N19/52

Abstract: A method for encoding a video stream for the provision of prunable video data, comprising identifying, in the video stream, a first event-generating occurrence in one or more frames of the video stream, and, in an encoder, using the event-generating occurrence to initiate a hierarchical branch extending from a base-layer when encoding the video stream.

公开(公告)号：US20200374536A1

公开(公告)日：2020-11-26

申请号：US16868579

申请日：2020-05-07

Applicant: Axis AB

Inventor： Viktor EDPALM ,  Alexandre MARTINS

IPC: H04N19/436 ,  H04N19/146 ,  H04N19/196 ,  H04N19/115 ,  H04N19/184

Abstract: There is provided a method and devices for encoding and streaming a video sequence over a plurality of network connections. A video sequence is encoded (S04) in parallel into a number of encoded video sequences having different video properties. The encoded video sequences are then streamed (S06) in parallel over the plurality of network connections. Each encoded video sequence is streamed over at least one of the plurality of network connections, and, for each network connection, an encoded video sequence having video properties that match desired video properties of the network connection. In response to detecting (S08) that the desired video properties of one of the network connections have changed, the number of encoded video sequences is increased or decreased (S10).