公开(公告)号：US12100213B2

公开(公告)日：2024-09-24

申请号：US17501126

申请日：2021-10-14

Applicant: Axis AB

Inventor： Viktor Edpalm ,  Song Yuan ,  Adnan Saleem ,  Rodrigo Such

IPC: G06V20/52 ,  G08B5/22 ,  H04N7/18 ,  H04N9/64

CPC classification number: G06V20/52 ,  G08B5/22 ,  H04N7/183 ,  H04N9/646

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：US12010320B2

公开(公告)日：2024-06-11

申请号：US17552616

申请日：2021-12-16

Applicant: Axis AB

Inventor： Song Yuan ,  Viktor Edpalm ,  Lars Branzén

IPC: H04N19/136 ,  H04L9/08 ,  H04L9/32 ,  H04N19/172

CPC classification number: H04N19/136 ,  H04L9/0825 ,  H04L9/3236 ,  H04L9/3247 ,  H04N19/172

Abstract: A method of processing a video stream comprises receiving a first/second set of input image frames comprising image data originating from a first/second source of input image frames; encoding the sets of input image frames into first/second sets of encoded image frames, forming a combined video stream, wherein an encoded image frame of the first set of encoded image frames exclusively references one or more other encoded image frames of the first set of encoded image frames, and an encoded image frame of the second set of encoded image frames references both an encoded image frame of the first set of encoded image frames and another encoded image frame of the second set of encoded image frames; and signing, using a first/second key, a first/second signing group comprising one or more encoded image frames of the first/second set of encoded image frames, wherein each key pertains to the respective source.

公开(公告)号：US11936920B2

公开(公告)日：2024-03-19

申请号：US17944198

申请日：2022-09-14

Applicant: Axis AB

Inventor： Song Yuan ,  Mikael Murstam

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

CPC classification number: H04N21/21805 ,  H04N5/45 ,  H04N21/2662

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：US11682190B2

公开(公告)日：2023-06-20

申请号：US16839083

申请日：2020-04-03

Applicant: Axis AB

Inventor： Hampus Linse ,  Song Yuan ,  Johan Förberg

IPC: G06V10/50 ,  G06T7/73 ,  G06T5/50 ,  G06V10/75 ,  G06V10/764 ,  G06V10/82 ,  G06V20/00

CPC classification number: G06V10/50 ,  G06T5/50 ,  G06T7/73 ,  G06V10/7515 ,  G06V10/764 ,  G06V10/82 ,  G06V20/00 ,  G06T2207/20021 ,  G06T2207/20081 ,  G06T2207/20084 ,  G06T2207/20221

Abstract: A method for detecting an object in a first distorted image using a sliding window algorithm, comprising: receiving an inverse of a mathematical representation of a distortion of the first distorted image; wherein the detection of an object comprises sliding a sliding window over the first distorted image, the sliding window comprising a feature detection pattern, and for each position of a plurality of positions in the first distorted image: transforming the sliding window based on the inverse of the mathematical representation of the distortion at the position, wherein the step of transforming the sliding window comprises transforming the feature detection pattern of the sliding window such that a resulting distortion of the feature detection pattern of the transformed sliding window corresponds to the distortion of the first distorted image at the position; and using the transformed sliding window comprising the transformed feature detection pattern in the sliding window algorithm.

公开(公告)号：US11610461B2

公开(公告)日：2023-03-21

申请号：US17242324

申请日：2021-04-28

Applicant: Axis AB

Inventor： Stefan Lundberg ,  Song Yuan ,  Tim Borglund

IPC: G08B13/196 ,  H04N5/232 ,  G06T5/00

Abstract: The present disclosure relates to a method performed by a background blurring system (1) for provision of a video compression stream from a video camera (2) adapted for capturing a scene. The background blurring system identifies (1001) in a first image of the scene, at a first point in time, at least a first pixel comprised in a background of the first image. The background blurring system further determines (1002) a blurred pixel value for the at least first pixel. Moreover, the background blurring system provides (1003), subsequent the first point in time, the blurred pixel value in the video compression stream. The background blurring system furthermore identifies (1004) in a second image of the scene, at a subsequent second point in time, that the at least first pixel has altered to be comprised in a foreground of the second image. Moreover, the background blurring system provides (1005) in the video compression stream, subsequent the second point in time—continuously and/or intermittently—identified non-blurred pixel values for the at least first pixel. The background blurring system further identifies (1006) in a third image of the scene, at a subsequent third point in time, that the at least first pixel has altered to be comprised in a background of the third image, wherein a value of the at least first pixel has remained unchanged from an intermediate point in time up to the third point in time. Furthermore, when the third point in time is within a predeterminable background merge time period from the intermediate point in time, the background blurring system provides (1007), subsequent the third point in time, the blurred pixel value in the video compression stream.
The disclosure also relates to a background blurring system in accordance with the foregoing, a video camera comprising such a background blurring system, and a respective corresponding computer program product and non-volatile computer readable storage medium.

公开(公告)号：US11172124B2

公开(公告)日：2021-11-09

申请号：US16862913

申请日：2020-04-30

Applicant: Axis AB

Inventor： Johan Forberg ,  Hampus Linse ,  Song Yuan

IPC: H04N5/232 ,  H04N19/159 ,  H04N19/172 ,  H04N19/59

Abstract: A video processing comprises a video image processing pipeline and an encoder. The video image processing pipeline is processes images of captured video data and comprises: an image stream forming function which generates a first and second image streams each comprising a plurality of image frames, and an image stabilization function for image stabilizing the first image stream, thereby forming a stabilized image stream. The image stream forming function bypasses the second image stream from the image stabilization function, thereby forming an original image stream. The encoder encodes the stabilized image stream and the original image stream as a joint encoded image stream comprising encoded frames based on images frames from both the stabilized \the original image streams, wherein the joint encoded image stream comprises intra and inter frames, and wherein the intra frames are exclusively encoded based on image frames of the original image stream.

公开(公告)号：US20210337158A1

公开(公告)日：2021-10-28

申请号：US17301102

申请日：2021-03-25

Applicant: Axis AB

Inventor： Axel Keskikangas ,  Song Yuan ,  John Rehn

IPC: H04N5/45 ,  H04N5/232 ,  H04N5/262 ,  H04N19/159 ,  H04N19/177 ,  H04N7/01 ,  H04N19/16 ,  H04N5/272

Abstract: Methods and apparatus, including computer program products, for controlling a Pan-Tilt-Zoom (PTZ) camera. A video stream is provided by the PTZ camera. The video stream includes a main image and a smaller picture-in-picture overlay. The main image and the overlay show the same view. The overlay has both a higher frame rate and a lower resolution compared to the main image. A movement control instruction is received, by the PTZ camera, in response to an evaluation of at least one of the main image and the overlay.

公开(公告)号：US10964182B2

公开(公告)日：2021-03-30

申请号：US16721247

申请日：2019-12-19

Applicant: Axis AB

Inventor： Song Yuan ,  Viktor Edpalm

IPC: G08B13/196 ,  G06K9/00

Abstract: A method encodes a sequence of image frames depicting an object whose privacy is to be protected. A first and a second version of the sequence of image frames is generated. Image frames of the first version, but not the second version, of the sequence are provided with a privacy mask to protect the privacy of the object depicted therein. The first version of the sequence is encoded as a first encoded sequence of intra-coded image frames and inter-coded image frames. A second version of the sequence is encoded as a second encoded sequence of inter-coded image frames. The inter-coded image frames of the second encoded sequence are encoded by using the intra-coded image frames of the first encoded sequence. The inter-coded image frames of the second encoded sequence are encrypted, and thereafter the first and the second encoded sequence are merged into a single output sequence.

公开(公告)号：US10810847B2

公开(公告)日：2020-10-20

申请号：US16525096

申请日：2019-07-29

Applicant: Axis AB

Inventor： Johan Stening ,  Hampus Linse ,  Song Yuan

IPC: G08B13/196 ,  H04N5/232

Abstract: A method and a camera system for stitching video data from two image sensors arranged to each capture video data of overlapping camera views comprises detecting motion in an area in the camera views corresponding to the overlapping camera views,determining an activity distance, being the distance from a position at the location of the two image sensors to an activity position including the detected motion, positioning in a three-dimensional coordinate system a predefined projection surface at a position having a distance between the position at the location of the image sensors and a position of the projection of the activity onto the projection surface that corresponds to the determined activity distance, projecting the video data from each of the image sensors onto the predefined projection surface that have been positioned at the activity distance, and outputting a two-dimensional video corresponding to the projection onto the projection surface.

公开(公告)号：US20190340731A1

公开(公告)日：2019-11-07

申请号：US16393916

申请日：2019-04-24

Applicant: Axis AB

Inventor： Johan Nyström ,  Song Yuan ,  Björn Ardö

IPC: G06T5/00 ,  H04N1/44 ,  G06T5/20

Abstract: Methods and devices for protecting personal privacy in captured image data by controlling privacy masking of an image, where the degree of blurring to be applied to a privacy area of the image depends on a threshold distance from the image capturing device, and the spatial resolution of content of the scene at this distance in the image.