公开(公告)号：US20210176411A1

公开(公告)日：2021-06-10

申请号：US17109520

申请日：2020-12-02

Applicant: Axis AB

Inventor： Thomas WINZELL ,  Jesper BENGTSSON ,  Mats BYLANDER

IPC: H04N5/33 ,  G01J5/00

Abstract: Methods and apparatus, including computer program products, for detecting a problem with a thermal camera. A current contrast value is determined for the thermal camera. It is determined whether the current contrast value deviates from a reference contrast value by more than a predetermined value. In response to determining that the current contrast value deviates from the reference contrast value by more than a predetermined value and for more than a predetermined period of time, an indication of a problem with the thermal camera is provided.

公开(公告)号：US20210176457A1

公开(公告)日：2021-06-10

申请号：US17109770

申请日：2020-12-02

Applicant: Axis AB

Inventor： Thomas WINZELL ,  Jesper BENGTSSON ,  Mats BYLANDER

IPC: H04N17/00 ,  G01J5/02

Abstract: Methods and apparatus, including computer program products, for detecting malfunction in a thermal camera. A first average response value is determined for a first shutter image captured by an image sensor in the thermal camera. A second average response value is determined of a second shutter image captured by the image sensor in the thermal camera. The first average response value and the second average response value are compared. In response to determining that the first average response value and the second average response value differ by more than a predetermined value, an indication of a malfunction of the thermal camera is provided.

公开(公告)号：US20160125618A1

公开(公告)日：2016-05-05

申请号：US14922346

申请日：2015-10-26

Applicant: Axis AB

Inventor： Emanuel JOHANSSON ,  Mats BYLANDER ,  Jesper BENGTSSON ,  Thomas WINZELL

IPC: G06T7/20 ,  H04N5/77 ,  G06T5/00

CPC classification number: H04N5/772 ,  G06T5/002 ,  G06T5/50 ,  G06T2207/10016 ,  G06T2207/20182 ,  G06T2207/20216 ,  G06T2207/30232 ,  G08B13/196 ,  G08B13/19602 ,  H04N7/183 ,  H04N21/234354 ,  H04N21/440254

Abstract: There is provided a method for pre-processing a video stream for subsequent motion detection processing. The method comprises receiving a video stream of images, wherein each image in the video stream is represented by a first plurality of bits; enhancing the video stream of images by, for each image in the video stream: comparing the image to at least one previous image in the video stream so as to identify pixels where the image differs from the at least one previous image in the video stream, enhancing the image in those pixels where the image differs from the at least one previous image in the video stream; and converting the enhanced video stream of images so as to produce a converted video stream of images for subsequent motion detection processing, wherein each image in the converted video stream is represented by a second plurality of bits being lower than the first plurality of bits.

Abstract translation: 提供了一种用于预处理用于后续运动检测处理的视频流的方法。 该方法包括接收图像的视频流，其中视频流中的每个图像由第一多个位表示; 通过视频流中的每个图像增强图像的视频流：将图像与视频流中的至少一个先前图像进行比较，以便识别图像与视频流中的至少一个先前图像不同的像素， 增强图像与视频流中的至少一个先前图像不同的像素中的图像; 以及转换所述增强的图像流，以产生用于后续运动检测处理的转换的图像流，其中所述经转换的视频流中的每个图像由比所述第一多个比特低的第二多个比特表示。