公开(公告)号：US20180205898A1

公开(公告)日：2018-07-19

申请号：US15868362

申请日：2018-01-11

Applicant: Axis AB

Inventor： Emanuel Johansson ,  Jesper Bengtsson ,  Thomas Winzell

IPC: H04N5/365 ,  G06K9/62 ,  H04N5/378

CPC classification number: H04N5/365 ,  G06K9/6202 ,  G06K9/6215 ,  G06T5/002 ,  H04N5/378

Abstract: An apparatus is disclosed for structural fixed pattern noise reduction in a video stream. A method may include, for each target pixel in a first image frame, defining a first target pixel patch, and defining a first search area comprising the first target pixel patch; for each pixel in the first search area, comparing a first pixel patch around the pixel with the first target pixel patch, and using the pixel when calculating an average for the target pixel. The method may include, in a second image frame, localizing a second target pixel, and defining a second search area comprising the second target pixel; for each pixel in the second search area, comparing a second pixel patch around the pixel of the second search area with the first target pixel patch, and using the pixel in the second search area when calculating an average for the target pixel.

公开(公告)号：US09628751B2

公开(公告)日：2017-04-18

申请号：US14922346

申请日：2015-10-26

Applicant: Axis AB

Inventor： Emanuel Johansson ,  Mats Bylander ,  Jesper Bengtsson ,  Thomas Winzell

IPC: H04N5/77 ,  G06T5/00 ,  G08B13/196 ,  H04N7/18 ,  G06T5/50 ,  H04N21/2343 ,  H04N21/4402

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.

公开(公告)号：US20170069069A1

公开(公告)日：2017-03-09

申请号：US15259403

申请日：2016-09-08

Applicant: AXIS AB

Inventor： Thomas Winzell ,  Emanuel Johansson ,  Mats Bylander ,  Jesper Bengtsson

IPC: G06T5/40

CPC classification number: G06T5/40 ,  G06T5/008 ,  G06T2207/10048 ,  H04N5/23229 ,  H04N5/2355 ,  H04N5/33

Abstract: A method for increasing enhancing local contrast in a thermal image for a class of objects having a thermal characteristic is provided. The method including providing thermal image data representing a first thermal image, where the first thermal image is acquired by an absolute calibrated thermal imaging system, redistributing the thermal image data having a first intensity distribution into a second intensity distribution using a predetermined redistribution function, where the predetermined redistribution function is based on the thermal characteristic, such that the local contrast is enhanced for the class of objects, outputting the redistributed thermal image data as the thermal image. An apparatus for enhancing local contrast in a thermal image for a class of objects having a thermal characteristic is further provided.

Abstract translation: 提供了一种用于增加对于具有热特性的一类物体的热图像中的局部对比度的增强的方法。 该方法包括提供表示第一热图像的热图像数据，其中通过绝对校准的热成像系统获取第一热图像，使用预定的再分布函数将具有第一强度分布的热图像数据重新分布到第二强度分布中，其中 预定的再分配功能基于热特性，使得对于对象类别增强局部对比度，输出重新分布的热图像数据作为热图像。 还提供了一种用于增强具有热特性的物体的热图像中的局部对比度的装置。