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公开(公告)号：US10109042B2
公开(公告)日：2018-10-23
申请号：US15259403
申请日：2016-09-08
申请人： AXIS AB
摘要： 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.
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公开(公告)号：US20230417599A1
公开(公告)日：2023-12-28
申请号：US18318024
申请日：2023-05-16
申请人： Axis AB
发明人： Thomas WINZELL , Ann-Sofie Rase , Jesper Bengtsson , Tuong Lam
IPC分类号： G01J5/02 , G01J5/0803 , G01J5/08 , G06T7/13 , G06T7/90
CPC分类号： G01J5/027 , G01J5/0803 , G01J5/0859 , G06T7/13 , G06T7/90 , G06T2207/20104 , G06T2207/30192
摘要： A device for monitoring a heap of material, comprises circuitry for executing a plurality of functions. A region of interest function, in a thermal video stream captured by a thermal video camera, defines a region of interest covering the heap of material. A reference spatial property setting function, from pixels within a video frame of the thermal video stream, determines a spatial property of the heap of material; and sets the determined spatial property as a reference spatial property. A region of interest adjusting function determines a respective sample spatial property for regions in the thermal video stream; and adjusts the region of interest such that regions exhibiting a sample spatial property above a threshold are included by the region of interest. A temperature monitoring function over time and within the region of interest, monitors a temperature measure; and if it exceeds a predetermined threshold, generates an alarm event.
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公开(公告)号：US10171763B2
公开(公告)日：2019-01-01
申请号：US15868362
申请日：2018-01-11
申请人： Axis AB
摘要： 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.
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公开(公告)号：US11205250B2
公开(公告)日：2021-12-21
申请号：US16905064
申请日：2020-06-18
申请人： Axis AB
发明人： Thomas Winzell , Jesper Bengtsson
摘要： A method for updating a fixed pattern noise matrix comprises: calculating a first difference between a target and first different images in a video stream to obtain a first differential matrix; calculating a second difference between the target and second different images in the video stream to obtain a second differential matrix; identifying a set of candidate positions for fixed pattern noise by: locating first and second sets of positions in the first differential matrix at which a difference deviates from predetermined values, finding a set of overlapping positions between the first and second sets of positions, and adjusting the set of overlapping positions. The adjusted set of overlapping positions is used for fixed pattern noise. Furthermore, each position in the set of candidate positions is updated, wherein the updated fixed pattern noise value at each position is based on a value at a corresponding non-adjusted position in the differential matrix.
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公开(公告)号：US20200082513A1
公开(公告)日：2020-03-12
申请号：US16563570
申请日：2019-09-06
申请人： Axis AB
摘要： A method and a system for filtering thermal image data. The method comprises: capturing thermal image data by a thermal image detector; forming a signal distribution of intensity values; identifying a first part in the signal distribution of intensity values, the first part being a peak having an intensity width equal to or smaller than a predetermined intensity span being based on a resolution parameter of the thermal image detector; identifying a second part having an intensity width larger than the predetermined intensity span; determining an intensity range between the first part and the second part; and filtering, if the intensity range is larger than a predetermined minimum intensity range, the thermal image data by excluding thermal image data forming part of the first part.
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公开(公告)号：US11457205B2
公开(公告)日：2022-09-27
申请号：US17109770
申请日：2020-12-02
申请人： Axis AB
发明人： Thomas Winzell , Jesper Bengtsson , Mats Bylander
摘要： 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.
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公开(公告)号：US20180205898A1
公开(公告)日：2018-07-19
申请号：US15868362
申请日：2018-01-11
申请人： Axis AB
CPC分类号： H04N5/365 , G06K9/6202 , G06K9/6215 , G06T5/002 , H04N5/378
摘要： 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.
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公开(公告)号：US09628751B2
公开(公告)日：2017-04-18
申请号：US14922346
申请日：2015-10-26
申请人： Axis AB
IPC分类号： H04N5/77 , G06T5/00 , G08B13/196 , H04N7/18 , G06T5/50 , H04N21/2343 , H04N21/4402
CPC分类号： H04N5/772 , G06T5/002 , G06T5/50 , G06T2207/10016 , G06T2207/20182 , G06T2207/20216 , G06T2207/30232 , G08B13/196 , G08B13/19602 , H04N7/183 , H04N21/234354 , H04N21/440254
摘要： 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.
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9.发明申请公开(公告)号：US20170069069A1
公开(公告)日：2017-03-09
申请号：US15259403
申请日：2016-09-08
申请人： AXIS AB
IPC分类号： G06T5/40
CPC分类号： G06T5/40 , G06T5/008 , G06T2207/10048 , H04N5/23229 , H04N5/2355 , H04N5/33
摘要： 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.
摘要翻译： 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。
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10.发明授权公开(公告)号：US11778334B2
公开(公告)日：2023-10-03
申请号：US17710134
申请日：2022-03-31
申请人： Axis AB
发明人： Thomas Winzell , Jesper Bengtsson
CPC分类号： H04N23/73 , G06T5/50 , G08B21/182 , H04N7/18 , G06T2207/10016 , G06T2207/10048 , G06T2207/10144 , G06T2207/20224 , G06T2207/30232
摘要： There is provided a method for capturing a sequence of image frames in a thermal camera having a microbolometer detector comprising: capturing a first sequence and a second sequence of image frames with a shutter of the thermal camera being in a closed state and an open state, respectively. While capturing each of the first and the second sequence, an integration time of the microbolometer detector is switched between a plurality of integration times according to one or more repetitions of a temporal pattern of integration times. The method further comprises correcting image frames in the second sequence that are captured when the integration time is switched to a particular position within the temporal pattern of integration times using image frames in the first sequence that are captured when the integration time is switched to the same particular position within the temporal pattern of integration times.
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