公开(公告)号：US20210168379A1

公开(公告)日：2021-06-03

申请号：US17069921

申请日：2020-10-14

Applicant: Axis AB

Inventor： Xing Danielsson FAN ,  Maya SHAH ,  Mattias PETTERSSON ,  Adam Schill COLLBERG ,  Fredrik PIHL ,  Magnus SÖDERDAHL ,  Peter WILHELMSSON

IPC: H04N19/176 ,  H04N19/61 ,  H04N19/172 ,  H04N19/593

Abstract: Video encoding, and specifically to a method and an encoder which can adapt the probability of intra refresh of image frame subdivisions based on a count of image frames since a previous refresh and modulated through convex or concave shaped distribution functions are set forth herein.

公开(公告)号：US20220124339A1

公开(公告)日：2022-04-21

申请号：US17499887

申请日：2021-10-13

Applicant: Axis AB

Inventor： Fredrik PIHL ,  Mattias PETTERSSON

IPC: H04N19/132 ,  H04N19/146 ,  H04N19/59 ,  H04N19/172

Abstract: An image processing device 300, a non-transitory computer readable storage medium, a monitoring camera 200 and a method 100 of pre-processing images of a video stream before encoding the video stream are disclosed. The images are obtained S110, wherein the obtained images have a first resolution. The obtained images are subsampled S120 to intermediate images having a second resolution lower than the first resolution and lower than a third resolution. The intermediate images are upsampled S130 to output images having the third resolution, wherein the third resolution is the same for all images of the video stream.

公开(公告)号：US20220078412A1

公开(公告)日：2022-03-10

申请号：US17366129

申请日：2021-07-02

Applicant: Axis AB

Inventor： Fredrik PIHL ,  Malte JOHANSSON

IPC: H04N19/11 ,  H04N19/159 ,  H04N19/182 ,  H04N19/176

Abstract: There is provided an image pipeline and a method therein for intra-coding an image frame. The image pipeline comprises a processing part followed by an encoding part supporting a plurality of intra-prediction modes used for intra-coding image frames. The method comprises receiving an image frame and for at least one block of pixel values in the image frame: predicting pixel values of the at least one block of pixel values using an intra-prediction mode supported by the encoding part and updating the image frame by adjusting at least one pixel value within the at least one block of pixel values so as to reduce a residual between the at least one pixel value and a corresponding predicted pixel value. Further, the method comprises intra-coding the updated image frame using at least one out of the plurality of intra-prediction modes.

公开(公告)号：US20220116625A1

公开(公告)日：2022-04-14

申请号：US17488349

申请日：2021-09-29

Applicant: Axis AB

Inventor： Fredrik PIHL ,  Mats LUND

IPC: H04N19/146 ,  H04N19/172 ,  H04N19/176 ,  H04N7/18 ,  H04N19/103

Abstract: An image processing device, a camera and a method of encoding a sequence of video images into a single video stream with dynamic bitrate are provided. The sequence of video images is encoded into frames of a base layer of the single video stream using a base layer resolution and a base layer compression level. Video images of the sequence of video images corresponding to respective times before detecting an event trigger are encoded into a first set of frames of an extended layer of the single video stream. The event trigger is detected and upon detecting the event trigger, video images of the sequence of video images corresponding to respective times after detecting the event trigger are encoded into a second set of frames of the extended layer using a higher resolution than the base layer resolution or a lower compression level than the base layer compression level.

公开(公告)号：US20220116589A1

公开(公告)日：2022-04-14

申请号：US17495839

申请日：2021-10-07

Applicant: Axis AB

Inventor： Fredrik PIHL ,  Mattias PETTERSSON

IPC: H04N19/105 ,  H04N19/146 ,  H04N19/159 ,  H04N19/176 ,  H04N5/232

Abstract: The present invention relates to the field of video encoding. In particular, it relates to a method 300 of encoding images captured by a camera and to an image processing device. An image sequence captured with an image sensor of the camera is obtained S310, and an oscillation frequency of a periodic movement of the camera during capturing of the image sequence is determined S320. A base subset of images of the image sequence corresponding to the oscillation frequency is identified S330 and the base subset of images are encoded S340 into an encoded video stream comprising intra frames and inter frames.