公开(公告)号：GB2491396A

公开(公告)日：2012-12-05

申请号：GB201109298

申请日：2011-06-03

Applicant: BAE SYSTEMS PLC

Inventor： JONES CHRISTOPHER CHARLES RAWLINSON ,  BENTLEY STEPHEN ,  FAIRHURST MICHAEL JOHN ,  ECCLES MARK

IPC: G06T7/00 ,  G01C11/02 ,  G01C15/00

Abstract: A method and apparatus for performing image processing, the method comprising: positioning a mark onto a surface (for example, by projecting a laser dot or laser lines onto the surface) then using a first sensor (e.g. a UV camera), generating a first image of the surface with at least a portion of the mark in the first image and a second sensor (e.g. a visible-light camera), to generate a second image of the surface with at least a portion of the mark in the second image. A process is then performed that is dependent upon the respective positions of the at least a portion of the mark in the first image and the second image, namely aligning the two images according to the position of the laser dot. The laser mark may alternatively be in the form of two non-parallel lines and may have a non-symmetrical shape. The alignment process may involve image transformation or movement of the image sensors. Furthermore in an alternative embodiment the laser mark may be projected at different time steps in a time period with each image being captured during separate portions of such a time period and the images may be time-aligned based on the respective positions of the laser mark. The different time steps may be selected by a pseudo random sequence. The sensors may be of different types e.g. UV, Infra-red, visible light and may be mounted in an aircraft.