公开(公告)号：US20180124329A1

公开(公告)日：2018-05-03

申请号：US15852311

申请日：2017-12-22

申请人： Axis AB

发明人： Jonas Hjelmström ,  Andreas Nilsson

IPC分类号： H04N5/262 ,  G06T7/13 ,  H04N5/357 ,  G06T7/80 ,  H04N5/217 ,  G06T5/00 ,  G06T3/00 ,  H04N17/00

CPC分类号： H04N5/2628 ,  G06T3/0093 ,  G06T5/006 ,  G06T7/13 ,  G06T7/80 ,  H04N5/217 ,  H04N5/3572 ,  H04N17/002

摘要： A method and apparatus for determining a focal-length setting of a lens mounted to a camera. In a method for determining a focal-length of a lens mounted to a camera, a distorted image of a scene is captured. A distortion-correction function is applied on the distorted image or on a portion of the distorted image. A most representative distortion-correction function is identified and a current focal-length setting for the lens is identified by correlating the identification to a data compilation.

公开(公告)号：US20160295115A1

公开(公告)日：2016-10-06

申请号：US15049952

申请日：2016-02-22

申请人： AXIS AB

发明人： Jonas Hjelmström ,  Andreas Nilsson

IPC分类号： H04N5/232

CPC分类号： H04N5/23287 ,  H04N5/23212 ,  H04N5/23254 ,  H04N5/23258 ,  H04N5/23267

摘要： In a method for image stabilization a number of operations are performed to stabilize an image and to output a focal length value. The steps include capturing video by means of a video camera with unknown focal length running an image stabilization process operating on an input from a hardware detector detecting the displacement of the camera and on an adjustable focal length value. Inter-image displacement is corrected based on the input from the hardware detector and the adjustable focal length value. By evaluating the displacement and adjusting the focal length value until a satisfactory image stabilization is achieved a value of the focal length may be output.

摘要翻译： 在用于图像稳定的方法中，执行多个操作以稳定图像并输出焦距值。 这些步骤包括通过具有未知焦距的摄像机拍摄视频，该视频摄像机运行在检测摄像机的位移的硬件检测器的输入上操作的图像稳定处理以及可调焦距值。 基于来自硬件检测器的输入和可调焦距值来校正图像间位移。 通过评估位移并调节焦距值直到获得令人满意的图像稳定，可以输出焦距值。