公开(公告)号：US20210281738A1

公开(公告)日：2021-09-09

申请号：US17194611

申请日：2021-03-08

Applicant: Axis AB

Inventor： Johan JEPPSSON ,  Björn BENDERIUS ,  Niclas SVENSSON ,  Fritjof JONSSON ,  Jonas LEVIN ,  Stefan LINDGREN

IPC: H04N5/232 ,  H04N5/357 ,  G03B13/36

Abstract: A method for determining whether a video camera is out-of-focus comprises: capturing image data; setting a focus setting difference threshold based on a filter function configured to filter the image data; adjusting a focus setting between a present focus setting and an altered focus setting such that a first subset of the image data is captured with the video camera being set in the present focus setting and such that a second subset of the image data is captured with the video camera being set in the altered focus setting, wherein the adjusting is performed such that a difference between the present and altered focus settings is below the threshold; forming the video stream by applying the filter function on the image data; determining first and second focus metrics of the image data; and determining whether the video camera is out-of-focus by comparing the first and second focus metrics.

公开(公告)号：US20200005443A1

公开(公告)日：2020-01-02

申请号：US16559102

申请日：2019-09-03

Applicant: Axis AB

Inventor： Sebastian FORS ,  Johan JEPPSSON

IPC: G06T5/50 ,  G06T5/00 ,  G06T11/00

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.

公开(公告)号：US20190114752A1

公开(公告)日：2019-04-18

申请号：US15783713

申请日：2017-10-13

Applicant: Axis AB

Inventor： Sebastian FORS ,  Johan JEPPSSON

IPC: G06T5/50 ,  H04N7/18 ,  G06T5/00 ,  G06T11/00

CPC classification number: G06T5/50 ,  G06T5/009 ,  G06T11/001 ,  G06T2200/32 ,  G06T2207/10024 ,  G06T2207/20208 ,  G06T2207/30204 ,  G06T2207/30232 ,  H04N7/183

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.