公开(公告)号：US20220067909A1

公开(公告)日：2022-03-03

申请号：US17380127

申请日：2021-07-20

Applicant: Axis AB

Inventor： Viktor EDPALM ,  Song YUAN

IPC: G06T7/00 ,  G06T7/20 ,  G06T1/00

Abstract: A method for determining authenticity of a video in a surveillance system, whereby a sequence of image frames of a scene is captured, and an object is tracked. A current image quality measure in an image area corresponding to the tracked object is determined in at least a first and second image frame. chosen such that the object has moved at least a predetermined distance between the first and second image frames. A current image quality measure variation for the object is determined, the image quality measure variation describing the image quality measure as a function of position of the object in the image frames. The current image quality measure variation is compared to a known image quality measure variation. In response to the current image quality measure variation deviating from the known pixel density variation by less than a predetermined amount, it is determined that the video is authentic.

公开(公告)号：US20210383501A1

公开(公告)日：2021-12-09

申请号：US17313221

申请日：2021-05-06

Applicant: Axis AB

Inventor： Viktor EDPALM ,  Song YUAN ,  Johan FÖRBERG ,  Viktors JAKOVELS

IPC: G06T3/00 ,  G06T7/55 ,  H04N5/225 ,  G06T3/40 ,  H04N5/232

Abstract: A digital camera and a method for aligning digital images comprising: receiving images including first and second images depicting a first and a second region of a scene, the regions being overlapping and displaced along a first direction; aligning the images using a transformation; determining disparity values for an overlap between the images; identifying misalignments by identifying blocks of pixels in the first image having a same position along a second direction and having disparity values exhibiting a variability lower than a first threshold and exhibiting an average higher than a second threshold; adjusting the transformation for the identified blocks of pixels in the first image and their matching blocks of pixels in the second image; and realigning the images using the adjusted transformation.

公开(公告)号：US20210168373A1

公开(公告)日：2021-06-03

申请号：US17082156

申请日：2020-10-28

Applicant: Axis AB

Inventor： Viktor EDPALM

IPC: H04N19/139 ,  H04N19/517 ,  H04N19/167 ,  H04N19/182 ,  H04N19/176

Abstract: A method encodes an image of a video sequence by analyzing motion in the video sequence to identify a coherent region in the image that has moved with a distance vector which is longer than a threshold since a previously encoded image in the video sequence. A cost for inter-coding the block is calculated as a combination of a cost for encoding a motion vector and a residual. For at least one block of pixels in the coherent region, the cost for encoding the motion vector is calculated relative to the distance vector of the coherent region instead of being calculated relative to a motion vector of a neighbouring block of pixels in the image. The block is then inter-coded if the combined cost for encoding the motion vector and the cost for encoding the residual when combined are below a cost for intra-coding the block of pixels.

公开(公告)号：US20210120238A1

公开(公告)日：2021-04-22

申请号：US17037820

申请日：2020-09-30

Applicant: Axis AB

Inventor： Viktor EDPALM

IPC: H04N19/115 ,  H04N19/593 ,  H04N19/146 ,  H04N19/136 ,  H04N19/172

Abstract: A video encoding method for encoding a series of images of original video data into an encoded video, comprises setting a periodic intra refresh pattern for the encoding of the series of images; setting a number of delta frames to be added between consecutive intra refresh frames of the periodic intra refresh pattern, thereby adjusting the intra refresh periodicity of the encoded video stream; and encoding the series of images of original video data into the encoded video stream using the set periodic intra refresh pattern and the set number of delta frames to be added between consecutive intra refresh frames. During the encoding, a current intra refresh frame is set to directly refer to a previous intra refresh frame and each delta frame added in between two consecutive intra refresh frames is set to only refer to a previous one of the two consecutive intra refresh frames.

公开(公告)号：US20210092412A1

公开(公告)日：2021-03-25

申请号：US17025227

申请日：2020-09-18

Applicant: Axis AB

Inventor： Viktor EDPALM

IPC: H04N19/184 ,  H04N19/169 ,  H04N19/172

Abstract: A video encoding method comprises encoding a series of images of original video data into an encoded video stream comprising key frames and delta frames, wherein the delta frames are organized in a hierarchical prediction pattern comprising a plurality of temporal layers. The video encoding method further comprises adding to the encoded video stream a hidden delta frame for at least some of the key frames. Each hidden delta frame corresponds to a key frame, is based on same original video data as the corresponding key frame and is referring to a previous key frame in the encoded video stream. Also, a method of reducing a file size of the video stream encoded according to the video encoding method is disclosed.

公开(公告)号：US20250063183A1

公开(公告)日：2025-02-20

申请号：US18776481

申请日：2024-07-18

Applicant: Axis AB

Inventor： Björn ARDÖ ,  Johan NYSTRÖM ,  Viktor EDPALM ,  Song YUAN ,  Johan FÖRBERG

IPC: H04N19/423 ,  H04N19/124 ,  H04N19/172 ,  H04N19/176 ,  H04N19/182 ,  H04N19/186 ,  H04N19/463 ,  H04N19/60 ,  H04N23/80

Abstract: Systems, methods and non-transitory computer-readable media transform raw image data into a video stream comprising a plurality of encoded image frames. To reduce memory bandwidth and power consumption, compression rates of sets of imaging data temporarily stored in memory during the transformation of raw image data into the video stream are adapted based on encoding configurations, on a pixel block level.

公开(公告)号：US20240397069A1

公开(公告)日：2024-11-28

申请号：US18654409

申请日：2024-05-03

Applicant: Axis AB

Inventor： Malte JOHANSSON ,  Viktor EDPALM

IPC: H04N19/30 ,  H04N19/124 ,  H04N19/172

Abstract: A method of encoding an input video including a sequence of video frames as a hybrid video stream, comprises downsampling the input video from an original spatial resolution to a reduced spatial resolution and an intermediate spatial resolution; providing the input video at the reduced spatial resolution to a base encoder to obtain a base encoded stream; providing a first enhancement stream based on first residuals at the intermediate spatial resolution; and providing a second enhancement stream based on second residuals based at the original spatial resolution, which is at least partially encoded using temporal prediction. The method further comprises detecting at least one non-motion region in a video frame, and causing the set of first residuals but not the set of second residuals to vanish throughout the non-motion region.

公开(公告)号：US20240276023A1

公开(公告)日：2024-08-15

申请号：US18410396

申请日：2024-01-11

Applicant: Axis AB

Inventor： Viktor EDPALM ,  Song YUAN

IPC: H04N19/85 ,  H04N19/136 ,  H04N19/172 ,  H04N19/176 ,  H04N19/182 ,  H04N19/184 ,  H04N19/186 ,  H04N19/20

CPC classification number: H04N19/85 ,  H04N19/136 ,  H04N19/172 ,  H04N19/176 ,  H04N19/182 ,  H04N19/184 ,  H04N19/186 ,  H04N19/20

Abstract: A method for encoding an image frame, performed by an image processing device, comprising obtaining image data, and identifying an image area in an image frame based on that the image area fulfilling an identification criterion. The method further comprises determining a bit depth reduction factor for the identified image area by analyzing the image data in the identified image area, and replacing some of the bit values of the pixel values in the identified image area with dummy values. How many of the bit values that are replaced with dummy values is defined by the bit depth reduction factor. The method comprises encoding the image frame upon said some of the bit values having been replaced in the identified image area.

公开(公告)号：US20230177733A1

公开(公告)日：2023-06-08

申请号：US18073993

申请日：2022-12-02

Applicant: Axis AB

Inventor： Viktor EDPALM ,  Alexander TORESSON ,  Johan PALMAEUS

IPC: G06T9/00 ,  G06T3/40

CPC classification number: G06T9/00 ,  G06T3/40

Abstract: An encoding device and a method for encoding an image frame comprising a plurality of pixel blocks are provided. A respective offset compression value is set for each of the plurality of pixel blocks based on an interest level associated with the pixel block, wherein each offset compression value defines an offset in relation to a reference compression value set for the image frame. In the image frame, one or more low contrast regions having a contrast which is below a predefined contrast threshold are identified. For pixel blocks within the one or more low contrast regions having set offset compression values based on the associated interest levels higher than a predefined offset compression threshold, the set offset compression values are selectively restricted to be at most equal to the predefined offset compression threshold. The image frame is then encoded using the set offset compression values.

公开(公告)号：US20230171409A1

公开(公告)日：2023-06-01

申请号：US17980156

申请日：2022-11-03

Applicant: Axis AB

Inventor： Viktor EDPALM ,  Song YUAN ,  Toivo HENNINGSSON ,  Johan PALMAEUS

IPC: H04N19/159 ,  G06T7/11 ,  G06T9/00 ,  G06V10/25

CPC classification number: H04N19/159 ,  G06T7/11 ,  G06T9/00 ,  G06V10/25

Abstract: A and method encode a view area within a current image frame of a video into an encoded video area frame. The view area is a respective subarea of each image frame, each image frame comprising first and second image portions, and between previous and current image frames, the view area moves across a boundary between the first and second image portions. First and second encoders are encode image data of the first and second image portions, respectively. First, second and third portions of the view area are identified based on their respective location in the previous and current image frames. Image data of the first and third portions are inter-coded as first and third encoded slices/tiles. Image data of the second portion of the view area in the current image frame are intra-coded as a second encoded slice/tile. The encoded slices/tiles are merged into the encoded video area frame.