公开(公告)号：US20250131573A1

公开(公告)日：2025-04-24

申请号：US18895723

申请日：2024-09-25

Applicant: Axis AB

Inventor： Ludvig HASSBRING

IPC: G06T7/12 ,  G06T3/40 ,  G06V10/764

Abstract: An image processing device generates an output image with masking of objects of classes. An input image is downscaled to an object detection image having a lower resolution than the input image and lower than the output image. The object detection image is input to an object detection module and confidence scores for pixel areas are received from the object detection module. Each confidence score indicates a probability that the pixel area relates to an object to be masked. Based on the input image, an intermediate image is generated having a higher resolution than the object detection image resolution and an adaptive masking threshold is set such that the greater the ratio between the output image resolution and the object detection image resolution, the lower the masking threshold. The output image is then generated by masking pixel areas of the intermediate image.

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.

公开(公告)号：US20240355021A1

公开(公告)日：2024-10-24

申请号：US18439209

申请日：2024-02-12

Applicant: Axis AB

Inventor： Ludvig HASSBRING ,  Mikael MURSTAM

IPC: G06T11/60 ,  G06T7/194 ,  G06T7/20 ,  G06T7/60 ,  G06V20/40

CPC classification number: G06T11/60 ,  G06T7/194 ,  G06T7/20 ,  G06T7/60 ,  G06V20/41 ,  G06T2207/20092 ,  G06T2210/12

Abstract: Methods and apparatus, including computer program products, implementing and using techniques for controlling the display of an overlay in a video. An overlay to be displayed in a video is defined. An overlay area is defined, which includes the overlay. At least one foreground object in the video is defined. A spatial overlap between the foreground object and the overlay area is determined. In response to determining that a size of the spatial overlap exceeds a first threshold, the entire overlay is stopped from being displayed within the overlay area.

公开(公告)号：US20240331283A1

公开(公告)日：2024-10-03

申请号：US18613146

申请日：2024-03-22

Applicant: Axis AB

Inventor： Ludvig HASSBRING ,  Mikael MURSTAM

IPC: G06T17/00 ,  G06T7/90 ,  G06V10/25 ,  G06V10/56 ,  G06V10/60 ,  G06V20/52

CPC classification number: G06T17/00 ,  G06T7/90 ,  G06V10/25 ,  G06V10/56 ,  G06V10/60 ,  G06V20/52 ,  G06T2207/10024 ,  G06V2201/07

Abstract: An image-processing device generates a three-dimensional model of a background scene of the image frame based on three-dimensional information about the background scene. The image-processing device defines a three-dimensional bounding box of the object in the three-dimensional model. The image-processing device defines a centre coordinate in the three-dimensional model and a colour value of surface elements of the three-dimensional bounding box. The image-processing device determines a three-dimensional coordinate of a surface in the three-dimensional model which reflects light from a surface element into the camera, by tracing rays from the centre coordinate and based on a normal of the surface. The image-processing device further identifies a first pixel in the image frame corresponding to the three-dimensional coordinate and detects the reflection of the object.

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.

公开(公告)号：US20240355014A1

公开(公告)日：2024-10-24

申请号：US18599237

申请日：2024-03-08

Applicant: Axis AB

Inventor： Johan FÖRBERG ,  Johan NYSTRÖM ,  Ludvig HASSBRING

IPC: G06T11/20 ,  G06T9/00

CPC classification number: G06T11/203 ,  G06T9/00 ,  G06T2210/08

Abstract: A device and a method for buffering a graphical overlay to be applied to an image is disclosed. A graphical overlay description specifying content, size, and position in the image of a graphical element of the graphical overlay is obtained, and the graphical overlay is divided into a plurality of sequential line fragments. For each line fragment it is determined, using the graphical overlay description, whether the line fragment overlaps a part of the graphical element. On condition that the line fragment overlaps a part of the graphical element, information representing the part of the graphical element is buffered in a buffer memory for the line fragment. On condition that the line fragment does not overlap any part of the graphical element, a run-length coding representing identical pixels is buffered in the buffer memory for the line fragment.

公开(公告)号：US20230410352A1

公开(公告)日：2023-12-21

申请号：US18333890

申请日：2023-06-13

Applicant: Axis AB

Inventor： Ludvig HASSBRING ,  Song YUAN

IPC: G06T7/70 ,  G06T3/40 ,  G06T7/20

CPC classification number: G06T7/70 ,  G06T3/40 ,  G06T7/20 ,  G06V2201/07 ,  G06T2207/20084 ,  G06T2207/20132

Abstract: A method and control unit for object detection in a video stream captured with an image acquisition device, especially for the purpose of anonymizing objects in the video stream.

公开(公告)号：US20230298185A1

公开(公告)日：2023-09-21

申请号：US18172411

申请日：2023-02-22

Applicant: Axis AB

Inventor： Ludvig HASSBRING ,  Jessica Nilsson ,  Song Yuan

IPC: G06T7/20 ,  G06V20/52 ,  G06F21/62

CPC classification number: G06T7/20 ,  G06V20/52 ,  G06F21/6245 ,  G06T2207/10016

Abstract: A method of masking in an output image stream includes receiving an input image stream capturing a scene, processing the input image stream to generate the output image stream, including using a detector to detect objects in the scene and a tracker to track objects in the scene based on information provided by the detector, and further including to generate a particular output image of the output image stream by checking whether there exists a particular area in the scene in which an evaluation of a historical performance of the detector and/or tracker fulfills at least one condition, and to, if confirming that such a particular area exists, mask the particular area of the scene in the particular output image. A corresponding device, computer program, and computer program product are also provided.

公开(公告)号：US20240404014A1

公开(公告)日：2024-12-05

申请号：US18678551

申请日：2024-05-30

Applicant: Axis AB

Inventor： Ludvig HASSBRING ,  Song YUAN

IPC: G06T5/50 ,  G06T7/194 ,  G06T7/20 ,  G06V10/762 ,  H04N5/272

Abstract: The present disclosure relates to a method of background modelling for a video stream acquired by a camera having movement capabilities. The method comprises: acquiring a video stream; repeatedly updating a background model for the video stream by analyzing changes in the sequence of image frames and categorizing image areas in the image frames which do not change over time as background; detecting camera movement; performing a reset of the background model by: applying an image segmentation and/or object detection algorithm to identify at least foreground objects; after having performed the reset of the background model, returning to repeatedly updating the background model for the video stream by analyzing changes in the sequence of image frames and categorizing image areas in the image frames which do not change over time as background. The disclosure further relates to an image processing system.

公开(公告)号：US20240355127A1

公开(公告)日：2024-10-24

申请号：US18606543

申请日：2024-03-15

Applicant: Axis AB

Inventor： Ludvig HASSBRING

IPC: G06V20/58 ,  G06T7/223 ,  G06V20/40

CPC classification number: G06V20/58 ,  G06T7/223 ,  G06V20/40 ,  G06V2201/07 ,  G06V2201/10

Abstract: A method for classifying a detected object is disclosed. First and second object detectors detect first and second objects in first and second image frames, respectively, of a video sequence, and first and second probability scores respectively are calculated indicating a probability that the detected object belongs to a specific class. The second image frame is subsequent to the first image frame. The first object detector has a higher object detection precision and a longer processing time than the second object detector. The first and second object detections are performed in parallel. Reducing the first classification threshold or increasing the first probability score are performed if the first probability score is below a first classification threshold and the second probability score is above a second classification threshold. The first object is determined to belong to the specific class based on the probability scores and the classification thresholds.