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    ENCODING OF VIDEO STREAM DURING CHANGING CAMERA FIELD-OF-VIEW
    1.
    发明公开
    ENCODING OF VIDEO STREAM DURING CHANGING CAMERA FIELD-OF-VIEW 审中-公开

    公开(公告)号：US20240333948A1

    公开(公告)日：2024-10-03

    申请号：US18606404

    申请日：2024-03-15

    Applicant: Axis AB

    Inventor： Viktor EDPALM ,  Song YUAN

    IPC: H04N19/30 ,  H04N19/139 ,  H04N19/172 ,  H04N23/69

    CPC classification number: H04N19/30 ,  H04N19/139 ,  H04N19/172 ,  H04N23/69

    Abstract: A method of encoding a video stream is provided, including obtaining a first image with a first FOV; encoding the first image as part of a first encoded video frame; obtaining a second image with a second FOV different from the first FOV; generating a first additional video frame referencing the first video frame, including motion vectors transforming image content of the first image to a FOV closer to the second FOV than the first FOV, wherein the motion vectors are formed based on a difference between the first and second FOVs; inserting the first additional video frame into the encoded video stream as a no-display frame, and encoding the second image as part of a second video frame of the encoded video stream referencing the first additional video frame. A corresponding device, computer program and computer program product are also provided.

    MASKING OF OBJECTS IN AN IMAGE STREAM
    3.
    发明公开
    MASKING OF OBJECTS IN AN IMAGE STREAM 审中-公开

    公开(公告)号：US20230298182A1

    公开(公告)日：2023-09-21

    申请号：US18184317

    申请日：2023-03-15

    Applicant: Axis AB

    Inventor： Ludvig HASSBRING ,  Song YUAN

    IPC: G06T7/12 ,  G06T5/00 ,  G06T7/20 ,  G06T7/70 ,  G06V10/10 ,  G06V10/25 ,  G06V10/60

    CPC classification number: G06T7/12 ,  G06T5/006 ,  G06T7/20 ,  G06T7/70 ,  G06V10/16 ,  G06V10/25 ,  G06V10/60 ,  G06V2201/07 ,  G06T2207/20132

    Abstract: A method of masking or marking an object in an image stream is provided, including: generating one or more output image streams by processing an input image stream capturing a scene, including discarding pixel information about the scene provided by pixels of the input image stream, such that the discarded pixel information about the scene is not included in any output image stream; and detecting an object in the scene using the discarded pixel information, wherein generating the one or more output image streams includes masking or marking the detected object in at least one output image stream once deciding that the object is at least partially visible within this at least one output image stream. A corresponding device, computer program and computer program product are also provided.

    GENERATING SUBSTITUTE IMAGE FRAMES BASED ON CAMERA MOTION
    4.
    发明申请
    GENERATING SUBSTITUTE IMAGE FRAMES BASED ON CAMERA MOTION 有权

    公开(公告)号：US20220132030A1

    公开(公告)日：2022-04-28

    申请号：US17498251

    申请日：2021-10-11

    Applicant: Axis AB

    Inventor： Viktor EDPALM ,  Song YUAN ,  Raphael TELLER

    IPC: H04N5/232 ,  H04N19/52 ,  H04N19/85

    Abstract: Methods and apparatus, including computer program products, for processing a stream of image frames captured by a camera system. When an image frame from the stream of image frames is dropped, a current camera movement is determined. A substitute image frame for the dropped image frame is generated. The substitute image frame comprises a reference to a previous image frame and includes one or more motion vectors estimated solely based on the determined current camera movement. Remaining image frames in the stream of image frames are encoded and the substitute image frame is inserted at the place of the dropped image frame in the stream of encoded image frames.

    METHOD, DEVICE, CAMERA AND SOFTWARE FOR PERFORMING ELECTRONIC IMAGE STABILIZATION OF A HIGH DYNAMIC RANGE IMAGE
    6.
    发明申请
    METHOD, DEVICE, CAMERA AND SOFTWARE FOR PERFORMING ELECTRONIC IMAGE STABILIZATION OF A HIGH DYNAMIC RANGE IMAGE 有权

    公开(公告)号：US20210337101A1

    公开(公告)日：2021-10-28

    申请号：US17203828

    申请日：2021-03-17

    Applicant: Axis AB

    Inventor： Song YUAN ,  Johan FÖRBERG

    IPC: H04N5/232

    Abstract: A system and method for electronic image stabilization for a high dynamic range image captured by a rolling shutter image sensor and more specifically to an algorithm configured to perform electronic image stabilization on the high dynamic range image, by, for each specific block of pixels among the blocks of pixels in the high dynamic range image, the specific block of pixels spatially corresponding to a pixel region of the rolling shutter image sensor, determining whether the specific block of pixels is copied from pixel data of the first image or the second image, or is a blend of pixel data from both the first image and the second image, and use motion data measured when capturing the first and second images for performing electronic image stabilization based on the origin of the specific block of pixels.

    MULTI-SENSOR HIGH DYNAMIC RANGE IMAGING
    7.
    发明申请
    MULTI-SENSOR HIGH DYNAMIC RANGE IMAGING 有权

    公开(公告)号：US20210185215A1

    公开(公告)日：2021-06-17

    申请号：US17086575

    申请日：2020-11-02

    Applicant: Axis AB

    Inventor： Song YUAN ,  Martin SANTESSON

    IPC: H04N5/235 ,  H04N5/225 ,  H04N5/265

    Abstract: High dynamic range imaging includes first image data captured using a first image sensor and a first exposure time, using a rolling shutter such that different lines within the first image data are captured at different times. Two or more instances of second image data are captured using second image sensors and second exposure times that are shorter than the first exposure time. The second image data are captured using a rolling shutter, and overlap at least in part with the first image data. A line of the first image data has a corresponding line in each instance of second image data, and the corresponding instances of second image data are captured at different second capture times. For a line in the first image data, the corresponding line from the instance of second image data is selected to be merged with the line in the first image data.

    METHODS, SYSTEMS AND NON-TRANSITORY COMPUTER-READABLE STORAGE MEDIUMS FOR DETECTING AN OBJECT OF A FIRST OBJECT TYPE IN A VIDEO SEQUENCE
    9.
    发明公开
    METHODS, SYSTEMS AND NON-TRANSITORY COMPUTER-READABLE STORAGE MEDIUMS FOR DETECTING AN OBJECT OF A FIRST OBJECT TYPE IN A VIDEO SEQUENCE 审中-公开

    公开(公告)号：US20240362893A1

    公开(公告)日：2024-10-31

    申请号：US18616836

    申请日：2024-03-26

    Applicant: Axis AB

    Inventor： Ludvig HASSBRING ,  Song YUAN

    IPC: G06V10/764 ,  G06T7/194

    CPC classification number: G06V10/764 ,  G06T7/194 ,  G06T2207/10016

    Abstract: The present disclosure relates to methods, systems and non-transitory computer-readable storage mediums for detecting an object of a first object type in a video sequence. A first algorithm is used to detect areas or objects in the scene as captured in the video stream that have an uncertain object type status. A second algorithm is used to provide a background model of the video sequence. For areas or objects having the uncertain object type status, the background model is used to check if the area or object is considered to be part of the background or the foreground in the video sequence. If the area or object is determined to belong to the foreground, the area or object is classified as the first object type. If the area or object is determined to not belong to the foreground, the area or object is not classified as the first object type.

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