99LMLLMM 4M TMMMMM AMMMMMMmMMMLFMMML3D X L30 MMM X 330 • LLENE 5.3LMpMMmbMM M0L4LMLLMM 4MTarget ArrangementsThis lesson explains the importance of target arrangements, whichinclude target placement and target mounting. Arranging and mountingtargets carefully ensures you are able to register scans successfully.The arrangement of the targets in relation to one another and in relationto the scanner position is critical to the registration process. If the targetsare not arranged properly, then registration cannot be done automatically,and will have to be done using other methods.There are several guidelines you should follow to ensure successfulregistration. Planning ahead and arranging the targets carefully will savetime and prevent problems during registration.Factors to consider when arranging targets include:• Number of targets• Distance from the scanner• Line of sight• Unique patterns• Spacing• Angle to the scanner• Bisecting• MountingNumber of TargetsMathematically, at least three common reference objects are required forregistration. If sensor data, such as Inclinometer data, is used, then onlytwo targets are required.Using more than three targets is recommended in case one or more arenot adequately visible, and to allow the registration to be refined, ormade more accurate.Slides 117-119Slide 120
