Axis Ab

Tim Borglund

Song Yuan

Stefan Lundberg

Carl-Axel Alm

Håkan Ardö

Johan Nyström

Ludvig Hassbring

Raphael Teller

Jessica Nilsson

Michael Barnes

A controller interacts with an image processing chain configured to process a video stream captured by a video camera and including an object detection algorithm which outputs a frame-wise detection score for each image region, and a masking function which applies a privacy mask in dependence of the detection score. When the controller detects a sudden change in luminance of a scene which is being imaged the video camera, it maintains or expands, for a period while the video camera is imaging the scene, the privacy mask which was applied at the detected sudden change. The maintaining or expanding of the privacy mask may be achieved by locally reducing a masking threshold applied by the masking function. The expansion of the privacy mask may be gradual over time and related to an estimated speed of a moving object in the scene.

Video monitoring with robust privacy masking

A method for anonymizing a digital colour image comprising obtaining the digital colour image, and applying a linear random function to a respective colour vector representing colour components of a respective pixel of the digital colour image to obtain a monochrome image. The linear random function varies over the pixels of the digital colour image, and is further dependent on at least one random parameter.

Method and image-processing device for anonymizing a digital colour image

The present disclosure relates to a method performed by a background blurring system () for provision of a video compression stream from a video camera () adapted for capturing a scene. The background blurring system identifies () in a first image of the scene, at a first point in time, at least a first pixel comprised in a background of the first image. The background blurring system further determines () a blurred pixel value for the at least first pixel. Moreover, the background blurring system provides (), subsequent the first point in time, the blurred pixel value in the video compression stream. The background blurring system furthermore identifies () in a second image of the scene, at a subsequent second point in time, that the at least first pixel has altered to be comprised in a foreground of the second image. Moreover, the background blurring system provides () in the video compression stream, subsequent the second point in time&#x2014;continuously and/or intermittently&#x2014;identified non-blurred pixel values for the at least first pixel. The background blurring system further identifies () in a third image of the scene, at a subsequent third point in time, that the at least first pixel has altered to be comprised in a background of the third image, wherein a value of the at least first pixel has remained unchanged from an intermediate point in time up to the third point in time. Furthermore, when the third point in time is within a predeterminable background merge time period from the intermediate point in time, the background blurring system provides (), subsequent the third point in time, the blurred pixel value in the video compression stream. The disclosure also relates to a background blurring system in accordance with the foregoing, a video camera comprising such a background blurring system, and a respective corresponding computer program product and non-volatile computer readable storage medium.

Video compression stream

Growing community of inventors

Lund, Sweden

Tim Borglund