US 12,170,781 B2
System and method for adding one additional image frame or a sequence of additional image frames to a stream of encoded image frames
Alexander Toresson, Lund (SE); and Malte Johansson, Lund (SE)
Assigned to AXIS AB, Lund (SE)
Filed by Axis AB, Lund (SE)
Filed on Mar. 21, 2023, as Appl. No. 18/187,239.
Claims priority of application No. 22169707 (EP), filed on Apr. 25, 2022.
Prior Publication US 2023/0345011 A1, Oct. 26, 2023
Int. Cl. H04N 19/137 (2014.01); G06V 10/56 (2022.01); G06V 10/60 (2022.01); H04N 19/159 (2014.01); H04N 19/186 (2014.01); H04N 19/56 (2014.01); H04N 19/60 (2014.01)
CPC H04N 19/159 (2014.11) [G06V 10/56 (2022.01); G06V 10/60 (2022.01); H04N 19/137 (2014.11); H04N 19/186 (2014.11)] 11 Claims
OG exemplary drawing
 
1. A method for adding at least one additional image frame or a sequence of additional image frames to a stream of encoded image frames, wherein the stream of encoded image frames consists of image frames encoded by an encoder, the method comprising:
detecting an event relating to one type out of two types of events:
a change of operation state of a sender of the stream of encoded image frames; and
a change of connection state between the sender and a receiver of the stream of encoded image frames;
depending on the type of the detected event, providing the one additional image frame or the sequence of additional image frames, wherein the one additional image frame or each additional image frame of the sequence of additional image frames comprises a reference to a preceding image frame and codes a predetermined visual change relative to the preceding image frame, wherein the predetermined visual change is indicative of the type of the detected event, wherein at least two different predetermined visual changes are selectable and each one of the two different predetermined visual changes is indicative of a respective one of the two types of events; and
adding the one additional image frame or the sequence of additional image frames to the stream of encoded image frames to obtain a combined stream of image frames to be decoded by a decoder and displayed on a display thereby displaying the predetermined visual changes indicative of the detected event.