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公开(公告)号：US10963997B2
公开(公告)日：2021-03-30
申请号：US16690429
申请日：2019-11-21
Applicant: Axis AB
Inventor： Sebastian Fors , Johan Jeppsson , Anton Ohrn , Jimmie Jonsson , Bjorn Benderius , Andreas Muhrbeck , Karin Dammer
Abstract: A method and a digital video camera for reducing intensity variations in a video stream depicting a scene comprising capturing, using a first sensor setting, a first frame; detecting a change in intensity in a portion of the first frame, the portion represents a first area of the scene; determining a second sensor setting based on the first frame; capturing, using the second sensor setting, a second frame; creating a local tone mapping mask, wherein a local tone mapping in the first area of the scene is different from a local tone mapping in an area outside the first area, and wherein the local tone mapping in the area outside the first area is based on a relation between the first sensor setting and the second sensor setting; and applying the local tone mapping mask to the second frame.
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公开(公告)号：US10991084B2
公开(公告)日：2021-04-27
申请号：US16559102
申请日：2019-09-03
Applicant: Axis AB
Inventor： Sebastian Fors , Johan Jeppsson
Abstract: A method of reducing purple fringing in images captured by a camera, comprises: acquiring a raw image of a scene with an image sensor of the camera, demosaicing the raw image, and applying an adjusted color correction matrix to the demosaiced raw image. The adjusted color correction matrix is deduced by calibrating the spectral response of the image sensor to a color rendition chart to which the color data of a purple fringe has been added, and furthermore the color correction matrix is adjusted such that the image sensor response for color values of the purple fringe is transformed into color values of a predetermined replacement color following application of the color correction matrix.
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公开(公告)号：US20200167901A1
公开(公告)日：2020-05-28
申请号：US16690429
申请日：2019-11-21
Applicant: Axis AB
Inventor： Sebastian Fors , Johan Jeppsson , Anton Ohrn , Jimmie Jonsson , Bjorn Benderius , Andreas Muhrbeck , Karin Dammer
Abstract: A method and a digital video camera for reducing intensity variations in a video stream depicting a scene comprising capturing, using a first sensor setting, a first frame; detecting a change in intensity in a portion of the first frame, the portion represents a first area of the scene; determining a second sensor setting based on the first frame; capturing, using the second sensor setting, a second frame; creating a local tone mapping mask, wherein a local tone mapping in the first area of the scene is different from a local tone mapping in an area outside the first area, and wherein the local tone mapping in the area outside the first area is based on a relation between the first sensor setting and the second sensor setting; and applying the local tone mapping mask to the second frame.
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公开(公告)号：US10417752B2
公开(公告)日：2019-09-17
申请号：US15783713
申请日：2017-10-13
Applicant: Axis AB
Inventor： Sebastian Fors , Johan Jeppsson
Abstract: A method of reducing purple fringing in images captured by a camera, comprises: acquiring a raw image of a scene with an image sensor of the camera, demosaicing the raw image, and applying an adjusted color correction matrix to the demosaiced raw image. The adjusted color correction matrix is deduced by calibrating the spectral response of the image sensor to a color rendition chart to which the color data of a purple fringe has been added, and furthermore the color correction matrix is adjusted such that the image sensor response for color values of the purple fringe is transformed into color values of a predetermined replacement color following application of the color correction matrix.
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