公开(公告)号：US20190199933A1

公开(公告)日：2019-06-27

申请号：US16220906

申请日：2018-12-14

Applicant: Axis AB

Inventor： Dennis Nilsson ,  Björn Benderius ,  Johan Jeppsson ,  Johan Nyström

IPC: H04N5/232 ,  G06T7/13 ,  G06T5/00 ,  G06T7/12

Abstract: A method for determining a local contrast value for a digital image captured by an image sensor in a camera comprising: applying an edge detection algorithm to image data of the digital image, thereby obtaining a data set pertaining to edges in the digital image; calculating, based on said data set, an edge occurrence value for the digital image; estimating, based on image data of the digital image and a noise model of the image sensor, an estimated image sensor noise for the digital image; and computing the local contrast value as a relationship between the edge occurrence value of the digital image and the expected edge occurrence value for the digital image. A method for adjusting a focus setting of a camera using the local contrast value for images captured by the camera.

公开(公告)号：US10757318B2

公开(公告)日：2020-08-25

申请号：US16220906

申请日：2018-12-14

Applicant: Axis AB

Inventor： Dennis Nilsson ,  Björn Benderius ,  Johan Jeppsson ,  Johan Nyström

IPC: H04N5/232 ,  G06T5/00 ,  G06T7/12 ,  G06T7/13

Abstract: A method for determining a local contrast value for a digital image captured by an image sensor in a camera comprising: applying an edge detection algorithm to image data of the digital image, thereby obtaining a data set pertaining to edges in the digital image; calculating, based on said data set, an edge occurrence value for the digital image; estimating, based on image data of the digital image and a noise model of the image sensor, an estimated image sensor noise for the digital image; and computing the local contrast value as a relationship between the edge occurrence value of the digital image and the expected edge occurrence value for the digital image. A method for adjusting a focus setting of a camera using the local contrast value for images captured by the camera.

公开(公告)号：US09906724B2

公开(公告)日：2018-02-27

申请号：US15251271

申请日：2016-08-30

Applicant: AXIS AB

Inventor： Dennis Nilsson ,  Johan Nystrom ,  Bjorn Benderius

IPC: H04N5/232

CPC classification number: H04N5/23254 ,  H04N5/23212 ,  H04N5/23258 ,  H04N5/2329 ,  H04N5/23296

Abstract: The present invention relates generally to auto focus algorithms for setting a focus of a camera. More specifically, the present invention relates to a method (600) and device for setting a focus of a camera wherein a camera motion level of the camera is continuously measured (S604) during the read-out of pixel data by a rolling shutter image sensor and wherein the auto focus algorithm uses weighted focus measures which are calculated (S612) using the continuously measured camera motion levels.