公开(公告)号：US12254751B2

公开(公告)日：2025-03-18

申请号：US17831499

申请日：2022-06-03

Applicant: Axis AB

Inventor： Tor Nilsson ,  Song Yuan

IPC: G08B13/196 ,  G06T7/194 ,  G06V20/52 ,  G11B27/031

Abstract: A method for masking of objects in a video stream, the method comprising: acquiring a video stream; detecting an object in the video stream; determining whether the detected object belongs to a foreground of the video stream indicative of moving objects or to a background of the video stream indicative of static objects; classifying the detected object to be of a specific type using a first classifier if the detected object is determined to belong to the foreground, and using a second classifier if the detected object is determined to belong to the background, the first classifier being different from the second classifier, and if the detected object is classified as being of the specific type of object, masking the object in the video stream.

公开(公告)号：US11765459B2

公开(公告)日：2023-09-19

申请号：US17531995

申请日：2021-11-22

Applicant: Axis AB

Inventor： Tor Nilsson ,  Johan Förberg ,  Toivo Henningsson ,  Johan Nyström

IPC: H04N5/232 ,  H04N23/68

CPC classification number: H04N23/683 ,  H04N23/6811 ,  H04N23/6812

Abstract: A method for image stabilization of a video stream captured by a panable and/or tiltable video camera the method comprising: generating a motor position signal, Y1, of a pan/tilt motor of the video camera; generating a gyro signal, Y2, of a gyroscopic sensor of the video camera; generating a reference signal from a predetermined movement curve of the pan/tilt motor of the video camera, the reference signal is a reference on how a pan/tilt operation of the video camera is made without shaking of the video camera; from the motor position signal, Y1, and the gyro signal, Y2, generating a combined signal, Y, according to: Y=F1*Y1+F2*Y2, wherein F1 is a low pass filter and F2 is a high pass filter; and performing image stabilization on the video stream based on a difference between the combined signal, Y, and the reference signal.