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    Methods and systems for encoding and decoding of video data in connection to performing a search in the video data
    14.
    发明授权
    Methods and systems for encoding and decoding of video data in connection to performing a search in the video data 有权

    公开(公告)号：US12149710B2

    公开(公告)日：2024-11-19

    申请号：US17942642

    申请日：2022-09-12

    Applicant: Axis AB

    Inventor： Xing Danielsson Fan ,  Niclas Danielsson

    IPC: H04N19/167 ,  G06F16/738 ,  G06F16/783

    Abstract: There are provided encoding and decoding methods, and corresponding systems which are beneficial in connection to performing a search among regions of interest, ROIs, in encoded video data. In the encoded video data, there are independently decodable ROIs. These ROIs and the encoded video frames in which they are present are identified in metadata which is searched responsive to a search query. The encoded video data further embeds information which associates the ROIs with sets of coding units, CUs, that spatially overlap with the ROIs. In connection to independently decoding the ROIs found in the search, the embedded information is used to identify the sets of CUs to decode.

    Segmentation method
    15.
    发明授权
    Segmentation method 有权

    公开(公告)号：US12136224B2

    公开(公告)日：2024-11-05

    申请号：US17864400

    申请日：2022-07-14

    Applicant: Axis AB

    Inventor： Niclas Danielsson ,  Xing Danielsson Fan ,  Axel Keskikangas

    IPC: G06K9/34 ,  G06T7/11 ,  G06T7/136 ,  G06V10/82 ,  H04N7/18

    Abstract: A method of generating a segmentation outcome which indicates individual instances of one or more object classes for an image in a sequence of images is disclosed. The method comprises: determining (501) a coherent region of the image; processing (502) the image to determine a tensor representing pixel-specific confidence scores; generating (503) a series of temporary segmentation masks for the coherent region, wherein each temporary segmentation mask is generated by interpreting the tensor with respect to a single object class using a different temporary confidence score threshold; evaluating (504) the series of temporary segmentation masks to determine if an object mask condition is met; depending on the outcome of the evaluation, setting (505) the temporary confidence score threshold as a final confidence score threshold for the pixels of the temporary segmentation mask, or setting (505) a default confidence score threshold as a final confidence score threshold for the coherent region; and generating (506) a final segmentation outcome for the image.

    Method and encoder system for determining GOP length for encoding video
    17.
    发明授权
    Method and encoder system for determining GOP length for encoding video 有权

    公开(公告)号：US10523940B2

    公开(公告)日：2019-12-31

    申请号：US15921302

    申请日：2018-03-14

    Applicant: Axis AB

    Inventor： Viktor Edpalm ,  Xing Danielsson Fan

    IPC: H04N19/124 ,  H04N19/177 ,  H04N19/114 ,  H04N19/146 ,  H04N19/137 ,  H04N19/147 ,  H04N19/159 ,  H04N19/196 ,  H04N19/573

    Abstract: A method of determining a maximum permissible key frame distance for use in encoding image frames in a video sequence comprising encoding a plurality of video test sequences, each video test sequence having a respective noise level, where each video test sequence is encoded using a respective quantization parameter and a plurality of key frame distances is disclosed. For each video test sequence, an output bitrate is determined for each key frame distance. For each combination of noise level, quantization parameter, and key frame distance, the determined output bitrate is stored and a maximum key frame distance at which output bitrate decreases in response to an increase in key frame distance is identified as maximum permissible key frame distance. A method of encoding image frames in a video sequence is also disclosed, as well as a system, a camera and a computer program product for performing the methods.

    Encoding a video stream having a privacy mask
    18.
    发明授权
    Encoding a video stream having a privacy mask 有权

    公开(公告)号：US10277901B2

    公开(公告)日：2019-04-30

    申请号：US15589350

    申请日：2017-05-08

    Applicant: Axis AB

    Inventor： Xing Danielsson Fan

    IPC: H04N11/02 ,  H04N19/137 ,  H04N19/119 ,  H04N19/132 ,  H04N19/159 ,  H04N19/114 ,  H04N19/70 ,  H04N19/177 ,  H04N19/51 ,  H04N19/61 ,  H04N19/527

    Abstract: Methods and apparatus, including computer program products, implementing and using techniques for encoding a video sequence having a plurality of image frames, wherein at least some of the image frames include a privacy mask. An original total amount of motion is estimated in a received image frame. A reduced amount of motion is determined in the image frame, based on the estimated total amount of motion for the image frame and the size and position of the privacy mask. The image frames are encoded into a sequence of output image frames, wherein a temporal frame distance is adjusted based on the determined reduced amount of motion.

    Method and apparatus for playing back recorded video
    20.
    发明授权
    Method and apparatus for playing back recorded video 有权

    公开(公告)号：US10109316B2

    公开(公告)日：2018-10-23

    申请号：US15602687

    申请日：2017-05-23

    Applicant: Axis AB

    Inventor： Björn Berglund ,  Xing Danielsson Fan

    IPC: H04N5/93 ,  G11B27/00 ,  G11B27/30 ,  G11B27/34 ,  G11B27/10

    Abstract: A method and an apparatus for playing back recorded video from a temporal position within a temporal range of the recorded video is disclosed. The recorded video including intra frames and inter frames and the recorded video including video sequences having different frame rates. The method comprises receiving a request for playing back the recorded video from a specific temporal position recorded in the recorded video, identifying an intra frame at an earlier temporal position in the recorded video than the specific temporal position received in the request, playing back the recorded video in a first mode from the identified intra frame, and playing back the recorded video in a second mode from the specific temporal position in the recorded video when the playing back of the recorded video in the first mode have arrived at the specific temporal position of in the recorded video.

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