公开(公告)号：US12118731B2

公开(公告)日：2024-10-15

申请号：US18172411

申请日：2023-02-22

Applicant: Axis AB

Inventor： Ludvig Hassbring ,  Jessica Nilsson ,  Song Yuan

IPC: G06T7/20 ,  G06F21/62 ,  G06V20/52

CPC classification number: G06T7/20 ,  G06F21/6245 ,  G06V20/52 ,  G06T2207/10016

Abstract: A method of masking in an output image stream includes receiving an input image stream capturing a scene, processing the input image stream to generate the output image stream, including using a detector to detect objects in the scene and a tracker to track objects in the scene based on information provided by the detector, and further including to generate a particular output image of the output image stream by checking whether there exists a particular area in the scene in which an evaluation of a historical performance of the detector and/or tracker fulfills at least one condition, and to, if confirming that such a particular area exists, mask the particular area of the scene in the particular output image. A corresponding device, computer program, and computer program product are also provided.

公开(公告)号：US12283113B2

公开(公告)日：2025-04-22

申请号：US18606543

申请日：2024-03-15

Applicant: Axis AB

Inventor： Ludvig Hassbring

IPC: G06V20/40 ,  G06T7/223 ,  G06V20/58

Abstract: A method for classifying a detected object is disclosed. First and second object detectors detect first and second objects in first and second image frames, respectively, of a video sequence, and first and second probability scores respectively are calculated indicating a probability that the detected object belongs to a specific class. The second image frame is subsequent to the first image frame. The first object detector has a higher object detection precision and a longer processing time than the second object detector. The first and second object detections are performed in parallel. Reducing the first classification threshold or increasing the first probability score are performed if the first probability score is below a first classification threshold and the second probability score is above a second classification threshold. The first object is determined to belong to the specific class based on the probability scores and the classification thresholds.

公开(公告)号：US12229983B2

公开(公告)日：2025-02-18

申请号：US18244337

申请日：2023-09-11

Applicant: Axis AB

Inventor： Song Yuan ,  Ludvig Hassbring

IPC: G06K9/00 ,  G06T7/12 ,  G06T7/70 ,  G06V10/25 ,  G06V20/52

Abstract: A method includes detecting a first object in a first area of a scene; determining, based on characteristics of the first object, a first probability value indicating a first probability that the detected first object; detecting a second object in a second area of the scene captured in a second stream of image frames by a second camera of the camera system different from the first camera, wherein the second area at least partly overlaps the first area; determining, based on characteristics of the second object, a second probability value indicating a second probability that the detected second object; and when the second probability value is below a second threshold value and the first probability value is above a first threshold value determining an updated second probability value by increasing the second probability value.

公开(公告)号：US20240221256A1

公开(公告)日：2024-07-04

申请号：US18532227

申请日：2023-12-07

Applicant: Axis AB

Inventor： Song YUAN ,  Ludvig Hassbring ,  Jessica Nilsson

IPC: G06T11/60 ,  G06T3/40 ,  G06T3/60 ,  H04N19/172 ,  H04N19/60

CPC classification number: G06T11/60 ,  G06T3/40 ,  G06T3/60 ,  H04N19/172 ,  H04N19/60

Abstract: A method for rendering a text string in a digital raster image suitable for block-wise transform coding, the method comprising: obtaining a partition of an image area into coding blocks for the block-wise transform coding; representing the text string as a plurality of graphical elements from a typeface which are arranged according to a tentative layout in the image area, wherein the tentative layout defines at least a position, orientation and size of each graphical element; modifying the tentative layout by applying a spectrum sparsening operation to at least one nonempty coding block, thereby obtaining a modified layout; and rendering a digital raster image of the graphical elements arranged according to the modified layout.