公开(公告)号：US20230130970A1

公开(公告)日：2023-04-27

申请号：US17942642

申请日：2022-09-12

Applicant: Axis AB

Inventor： Xing DANIELSSON FAN ,  Niclas DANIELSSON

IPC: H04N19/167 ,  G06F16/738 ,  G06F16/783

Abstract: There are provided encoding and decoding methods, and corresponding systems which are beneficial in connection to performing a search among regions of interest, ROIs, in encoded video data. In the encoded video data, there are independently decodable ROIs. These ROIs and the encoded video frames in which they are present are identified in metadata which is searched responsive to a search query. The encoded video data further embeds information which associates the ROIs with sets of coding units, CUs, that spatially overlap with the ROIs. In connection to independently decoding the ROIs found in the search, the embedded information is used to identify the sets of CUs to decode.

公开(公告)号：US20220198778A1

公开(公告)日：2022-06-23

申请号：US17539261

申请日：2021-12-01

Applicant: Axis AB

Inventor： Niclas DANIELSSON ,  Haochen LIU

IPC: G06V10/74 ,  G06V10/762 ,  G06N3/04 ,  G06V10/82 ,  G06V10/44

Abstract: A method and a device associate an object detection in a first frame with an object detection in a second frame using a convolutional neural (CNN) network trained to determine feature vectors such that object detections relating to separate objects are arranged in separate clusters. The CNN determines a reference set of feature vectors associated with the object detection in the first frame, and candidate sets of feature vectors associated with a respective one of identified areas corresponding to object detections in the second frame. A set of closest feature vectors is determined, and then measure of closeness to the reference set of feature vectors is determined for each candidate. A respective weight is determined for each object detection in the second frame. The object detection in the first frame is associated with one of the object detections in the second frame based on the assigned weights.

公开(公告)号：US20220182625A1

公开(公告)日：2022-06-09

申请号：US17523280

申请日：2021-11-10

Applicant: Axis AB

Inventor： Niclas DANIELSSON ,  Xing DANIELSSON FAN

IPC: H04N19/119 ,  G06T7/194 ,  G06K9/62 ,  H04N19/176 ,  H04N19/137 ,  H04N19/162 ,  H04N7/01 ,  G06T7/215 ,  G06K9/00

Abstract: Methods, systems and computer program products, for producing streams of image frames. Image frames in streaming video are segmented into background segments and instance segments. A background image frame containing the background segments is created. At least some of the instance segments are classified into movable objects of interest and movable objects of non-interest. During a background update time period, the background image frame is updated when a movable object of non-interest has moved to reveal a background area, to include the revealed background area in the background image frame. A foreground image containing the movable objects of interest is created. Blocks of pixels of the updated background and foreground image frames are encoded. A stream of encoded foreground image frames having a first frame rate is produced. A stream of encoded updated background image frames a second, lower frame rate is produced.