公开(公告)号：US20230345011A1

公开(公告)日：2023-10-26

申请号：US18187239

申请日：2023-03-21

Applicant: Axis AB

Inventor： Alexander TORESSON ,  Malte JOHANSSON

IPC: H04N19/159 ,  H04N19/137 ,  H04N19/186 ,  G06V10/56 ,  G06V10/60

CPC classification number: H04N19/159 ,  H04N19/137 ,  H04N19/186 ,  G06V10/56 ,  G06V10/60

Abstract: A method for adding at least one additional image frame to a stream of encoded image frames, the stream of encoded image frames comprising image frames encoded by an encoder. An event relating to at least one of: i) a change of operation state of a sender of the stream of encoded image frames, or ii) a change of connection state between the sender and a receiver is detected. Depending on the type of the detected event, the at least one additional image frame is provided. Each at least one additional image frame comprises a reference to a preceding image frame and codes a predetermined visual change relative to the preceding image frame. The predetermined visual change is indicative of the type of the detected event. The at least one additional image frame is added to the stream of encoded image frames to obtain a combined stream of image frames.

公开(公告)号：US20230177733A1

公开(公告)日：2023-06-08

申请号：US18073993

申请日：2022-12-02

Applicant: Axis AB

Inventor： Viktor EDPALM ,  Alexander TORESSON ,  Johan PALMAEUS

IPC: G06T9/00 ,  G06T3/40

CPC classification number: G06T9/00 ,  G06T3/40

Abstract: 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.

公开(公告)号：US20220201330A1

公开(公告)日：2022-06-23

申请号：US17530739

申请日：2021-11-19

Applicant: Axis AB

Inventor： Viktor EDPALM ,  Alexander TORESSON ,  Johan PALMAEUS ,  Jonas CREMON

IPC: H04N19/597 ,  H04N19/88 ,  H04N19/105 ,  H04N19/172 ,  H04N5/04

Abstract: A method for forming a combined image frame of a combined video stream comprises: capturing image frames of first and second video streams; encoding image data of the image frames of the first and second video streams, wherein each image frame of the first and second video streams are respectively encoded into first and second encoded data comprising a plurality of rows wherein each row has a height of a single coding unit and a width equal to a width of the image frame and is encoded as one or more slices; and combining the first and second encoded data into combined encoded data by interleaving rows of the first and second encoded data. The combined encoded data representing the combined image frame of the combined video stream.