Influence of severe vibrations on the visual perception of video sequences

There are two kinds of video image sequence distortions caused by vibration of the camera. The first is the vibration of the line-of-sight, causing lo cation changes of the scene in successive frames. The second distortion is the blur of each frame of the sequence due to frame motion during its expos ure. The relative effects of these two types of degradations on the ability of observers to recognize targets are investigated. This study is useful f or evaluating the amount of effort required to compensate each effect. We f ound that the threshold contrast needed to recognize a target in a vibratin g video sequence under certain conditions is more affected by the motion bl ur of each frame than the oscillation of the line-of-sight. For digital seq uence restoration methods, this study determines the required precision of the deblurring and registration processes. It shows that the deblurring pro cess should not be neglected, as it often is. (C) 2001 Society of Photo-Opt ical Instrumentation Engineers.