公开(公告)号：US20230368528A1

公开(公告)日：2023-11-16

申请号：US18129910

申请日：2023-04-03

Applicant: Axis AB

Inventor： Xing Danielsson FAN ,  Niclas DANIELSSON

IPC: G06V20/40

CPC classification number: G06V20/40 ,  G06V2201/10

Abstract: A method and a device for setting a value of an object property in a sequence of metadata frames corresponding to a sequence of video frames is provided. An object is detected in a plurality of video frames. For a temporally first video frame a first value of an object property is determined and the object property is set to have the first value in a metadata frame corresponding to the first video frame. For each subsequent video frame, a subsequent value of the object property is determined and a deviation is calculated with respect to a value of the object property that was last set in a metadata frame. If the deviation exceeds a non-zero threshold, the object property is set to have the subsequent value in a metadata frame corresponding to the subsequent video frame. Otherwise no value of the object property is set in that metadata frame.

公开(公告)号：US20210168379A1

公开(公告)日：2021-06-03

申请号：US17069921

申请日：2020-10-14

Applicant: Axis AB

Inventor： Xing Danielsson FAN ,  Maya SHAH ,  Mattias PETTERSSON ,  Adam Schill COLLBERG ,  Fredrik PIHL ,  Magnus SÖDERDAHL ,  Peter WILHELMSSON

IPC: H04N19/176 ,  H04N19/61 ,  H04N19/172 ,  H04N19/593

Abstract: Video encoding, and specifically to a method and an encoder which can adapt the probability of intra refresh of image frame subdivisions based on a count of image frames since a previous refresh and modulated through convex or concave shaped distribution functions are set forth herein.

公开(公告)号：US20240007299A1

公开(公告)日：2024-01-04

申请号：US18142582

申请日：2023-05-03

Applicant: Axis AB

Inventor： Xing Danielsson FAN ,  Niclas DANIELSSON

IPC: H04L9/32 ,  G06T7/70 ,  G06V10/25 ,  H04L9/08

CPC classification number: H04L9/3247 ,  G06T7/70 ,  G06V2201/07 ,  H04L9/0825 ,  H04L9/3236 ,  G06V10/25

Abstract: A device, a non-transitory computer-readable storage medium, and a method of signing a metadata frame corresponding to an image frame of a sequence of image frames are disclosed. The metadata frame comprises metadata of one or more detected objects in the image frame, and the metadata of each detected object comprises coordinates defining a location in the image frame of the detected object. A digital signature is generated based on at least a subset of the metadata in the metadata frame, and additional metadata are added to the metadata frame. The additional metadata comprise the digital signature and predefined coordinates which define that the additional metadata comprise the digital signature. Furthermore, a device, a non-transitory computer-readable storage medium, and method of authenticating a digitally signed metadata frame corresponding to an image frame of a sequence of image frames are disclosed.

公开(公告)号：US20230086993A1

公开(公告)日：2023-03-23

申请号：US17864400

申请日：2022-07-14

Applicant: Axis AB

Inventor： Niclas DANIELSSON ,  Xing Danielsson FAN ,  Axel KESKIKANGAS

IPC: G06T7/136 ,  G06T7/11 ,  G06V10/82

Abstract: A method of generating a segmentation outcome which indicates individual instances of one or more object classes for an image in a sequence of images is disclosed. The method comprises: determining (501) a coherent region of the image; processing (502) the image to determine a tensor representing pixel-specific confidence scores; generating (503) a series of temporary segmentation masks for the coherent region, wherein each temporary segmentation mask is generated by interpreting the tensor with respect to a single object class using a different temporary confidence score threshold; evaluating (504) the series of temporary segmentation masks to determine if an object mask condition is met; depending on the outcome of the evaluation, setting (505) the temporary confidence score threshold as a final confidence score threshold for the pixels of the temporary segmentation mask, or setting (505) a default confidence score threshold as a final confidence score threshold for the coherent region; and generating (506) a final segmentation outcome for the image.