公开(公告)号：US12278970B2

公开(公告)日：2025-04-15

申请号：US17942592

申请日：2022-09-12

Applicant: Axis AB

Inventor： Mattias Pettersson ,  Björn Völcker ,  Malte Johansson

IPC: H04N19/15 ,  H04N19/107 ,  H04N19/136 ,  H04N19/177 ,  H04N19/184 ,  H04N19/423

Abstract: A computer implemented method for controlling a transmission of a video stream is provided. The method comprises estimating a number of bits for a group of pictures, GOP, of the video stream to be transmitted, setting a latency requirement for the transmission of the video stream, determining an average minimum video bitrate across the GOP based on the estimated number of bits and a time corresponding to a time period represented by a duration of the GOP, for video frames in the GOP setting an output bitrate for transmission of a video frame based on the latency requirement and the average minimum video bitrate, and transmitting the video frame using the output bitrate.

公开(公告)号：US12170781B2

公开(公告)日：2024-12-17

申请号：US18187239

申请日：2023-03-21

Applicant: Axis AB

Inventor： Alexander Toresson ,  Malte Johansson

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

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：US11539944B2

公开(公告)日：2022-12-27

申请号：US17366129

申请日：2021-07-02

Applicant: Axis AB

Inventor： Fredrik Pihl ,  Malte Johansson

IPC: H04N19/11 ,  H04N19/159 ,  H04N19/176 ,  H04N19/182

Abstract: 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.