 the complete string of the movie filename</span>
0018 <span class="comment">%      FrameRange:  range of frames to examine</span>
0019 <span class="comment">%      NBackFrames: number of frames in static background, used only to</span>
0020 <span class="comment">%                   find fly in first frame</span>
0021 <span class="comment">%      opt1:        'neg' or 'pos'.  This multiplies the frame data by a</span>
0022 <span class="comment">%                   negative sign ('neg') or not ('pos').  Find