US 12,464,144 B2
Method for identifying stationary regions in frames of a video sequence
Song Yuan, Lund (SE)
Assigned to Axis AB, Lund (SE)
Filed by Axis AB, Lund (SE)
Filed on Apr. 14, 2022, as Appl. No. 17/720,528.
Claims priority of application No. 21174922 (EP), filed on May 20, 2021.
Prior Publication US 2022/0377355 A1, Nov. 24, 2022
Int. Cl. H04N 19/20 (2014.01); G06V 10/22 (2022.01); G06V 20/40 (2022.01); H04N 19/103 (2014.01); H04N 19/12 (2014.01); H04N 19/139 (2014.01); H04N 19/157 (2014.01); H04N 19/167 (2014.01); H04N 19/176 (2014.01); H04N 19/182 (2014.01)
CPC H04N 19/20 (2014.11) [G06V 10/22 (2022.01); G06V 20/41 (2022.01); H04N 19/103 (2014.11); H04N 19/12 (2014.11); H04N 19/139 (2014.11); H04N 19/157 (2014.11); H04N 19/167 (2014.11); H04N 19/176 (2014.11); H04N 19/182 (2014.11)] 18 Claims
OG exemplary drawing
 
11. A non-transitory computer-readable medium having stored thereon computer code instructions adapted to carry out a method for identifying stationary regions in frames of a video sequence when executed by a device having processing capability the method comprising:
receiving a bitstream comprising an encoded version of the video sequence, wherein the encoded version of the video sequence includes an intra-coded frame followed by a plurality of inter-coded frames;
reading, from the received bitstream, coding-mode information associated with the plurality of inter-coded frames without fully decoding the frames;
finding, using the read coding-mode information, one or more blocks of pixels that each was skip-coded in a respective plurality of consecutive frames in the encoded version of the video sequence;
maintaining, a timer for each skip-coded block of pixels, each timer corresponding to a block of pixels and indicating in how many consecutive frames before and including a present inter-coded frame said block of pixels was skip-coded where the timer is reset in response to said block of pixels ceasing to be skip-coded;
identifying each found block of pixels as a stationary region in the respective plurality of consecutive frames; and
modifying video data of the frames of the video sequence to make video data in the identified stationary regions less salient than video data in other regions, wherein the video data in the identified stationary regions is made less salient by reducing its luminance, chrominance and/or opacity,
wherein a level of saliency of a block of pixels in a stationary region in a frame of the video sequence is set depending on the timer which is maintained for that block of pixels, wherein the level of saliency decreases with increasing value of the timer.