公开(公告)号：US20230129908A1

公开(公告)日：2023-04-27

申请号：US17944198

申请日：2022-09-14

Applicant: Axis AB

Inventor： Song YUAN ,  Mikael MURSTAM

IPC: H04N21/218 ,  H04N21/2662 ,  H04N5/45

Abstract: The present disclosure relates to a method of providing a video stream from a system comprising a main unit and a plurality of sensors, wherein the main unit is configured to receive data from the plurality of sensors, the method comprising the steps of: transmitting a multi-view video stream from the main unit to a client, wherein the multi-view video stream represents a multi-view composed of sensor data views from the plurality of sensors in the system; receiving, in the main unit, a command from the client representing a zoom-in operation; computing an updated multi-view according to the received command; evaluating if the updated multi-view includes an area outside a dominating sensor data view in the updated multi-view that is greater than a predetermined threshold; if the area outside the dominating sensor data view is greater than the predetermined threshold, transmitting a multi-view video stream representing the updated multi-view; if the area outside the dominating sensor data view is less than, or equal to, the predetermined threshold, transmitting a single-view video stream representing the dominating sensor data view. The present disclosure further relates to a system for providing a video stream comprising sensor data views.

公开(公告)号：US20230123239A1

公开(公告)日：2023-04-20

申请号：US17963707

申请日：2022-10-11

Applicant: Axis AB

Inventor： Song YUAN ,  Viktor EDPALM

IPC: H04N19/167 ,  H04N19/30 ,  H04N19/85 ,  H04N19/105 ,  H04N19/182 ,  H04N19/17 ,  H04N19/436

Abstract: The present disclosure relates to a method for encoding a video stream. The method comprising: acquiring pixel data of the video stream having a first resolution; extracting a crop corresponding to a region of interest from the pixel data of the video stream, the crop having the first resolution; down-scaling the pixel data of the video stream into a down-scaled video stream having a second resolution lower than the first resolution; processing the down-scaled video stream through one or more video processing operations; processing the crop through the one or more video processing operations; up-scaling the processed down-scaled video stream into an up-scaled video stream having the first resolution; merging the processed crop and the up-scaled video stream into a merged video stream; and encoding the merged video stream. The present disclosure further related to a video encoding device.

公开(公告)号：US20230017325A1

公开(公告)日：2023-01-19

申请号：US17831499

申请日：2022-06-03

Applicant: Axis AB

Inventor： Tor NILSSON ,  Song YUAN

IPC: G08B13/196 ,  G06V20/52 ,  G06T7/194 ,  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：US20220129680A1

公开(公告)日：2022-04-28

申请号：US17501126

申请日：2021-10-14

Applicant: Axis AB

Inventor： Viktor EDPALM ,  Song YUAN ,  Adnan SALEEM ,  Rodrigo SUCH

IPC: G06K9/00 ,  H04N9/64 ,  H04N7/18 ,  G08B5/22

Abstract: Methods, systems and computer program products, for processing a stream of image frames captured by a camera system. A hardcoded alert image frame is generated in response to detecting an event. The hardcoded alert image frame includes motion deltas and/or color changes with respect to an event image frame. A stream of encoded image frames is generated, in which stream the hardcoded alert image frame is inserted in display order after the encoded event image frame.

公开(公告)号：US20220122294A1

公开(公告)日：2022-04-21

申请号：US17462481

申请日：2021-08-31

Applicant: Axis AB

Inventor： Johan NYSTRÖM ,  Johan FÖRBERG ,  Song YUAN

IPC: G06T9/00 ,  H04N19/105 ,  H04N19/132 ,  H04N19/137 ,  H04N19/159 ,  H04N19/182 ,  H04N19/176

Abstract: Image encoding within a pixelated privacy mask area is adapted in order to reduce flickering during movement of a camera. Motion vectors are set equal to the movement of the camera, and residuals are set to zero, thereby encoding pixel blocks within the privacy mask area as copies of corresponding pixel blocks in a reference image.

公开(公告)号：US20210337123A1

公开(公告)日：2021-10-28

申请号：US17237246

申请日：2021-04-22

Applicant: Axis AB

Inventor： Johan NYSTRÖM ,  Song YUAN

IPC: H04N5/232 ,  G06T7/11

Abstract: Methods and apparatus, including computer program products, for selecting a cropping area in a sequence of images captured by a camera. First external motion data including data of external factors affecting movement of the camera is correlated with internal motion data describing a movement of the camera. The first external motion data and the internal motion data are obtained during a first time interval. Second external motion data is obtained during a second time interval subsequent to the first time interval. A sequence of images being captured during a third time interval is stabilized by selecting a cropping area based on the correlation and the second external motion data. The cropping area remains constant and maximized in size with respect to the field of view of the images during the third time interval. The third time interval is subsequent to, or partly overlapping with, the second time interval.

公开(公告)号：US20210297602A1

公开(公告)日：2021-09-23

申请号：US17191157

申请日：2021-03-03

Applicant: Axis AB

Inventor： Song YUAN

IPC: H04N5/232 ,  H04N5/77 ,  H04N7/06 ,  H04N17/00

Abstract: A method for power consumption optimization in a wearable camera comprises: monitoring a bitrate of a video stream captured by the wearable camera. Upon the bitrate being above a first bitrate threshold, activating a movement sensor of the wearable camera. Upon activation of the movement sensor, analyzing whether activation of the movement sensor is beneficial for reducing the bitrate. In case activation of the movement sensor is beneficial for reducing the bitrate, keeping the movement sensor active and performing image stabilization based on movement data from the movement sensor, otherwise, deactivating the movement sensor. Also, a wearable camera is presented.

公开(公告)号：US20210097695A1

公开(公告)日：2021-04-01

申请号：US17026321

申请日：2020-09-21

Applicant: Axis AB

Inventor： Stefan LUNDBERG ,  Song YUAN

IPC: G06T7/20 ,  G06T5/20 ,  G06T7/70 ,  G06T7/194

Abstract: A method includes defining a background model of the video sequence by applying a first algorithm, the background model defining whether that spatial area belongs to a background or a foreground in the video sequence, wherein a detected significant change in image data in a spatial area in an image frame relative image data in said spatial area in a preceding image frame is indicative of said spatial area belonging to the foreground; indicating that an idle area of the defined foreground areas is to be transitioned from foreground to background; and determining whether the idle area is to be transitioned by applying a second algorithm to image data of an image frame of the video sequence, the image data at least partly corresponding to the idle area; wherein if the idle area is not to be transitioned, maintaining the idle area as a foreground area in the background model.