Figure 3: Band 4 of Landsat TM, edgel chains superimposed 
  
Figure 4: Line segment with midpoint passing through a mixed pixel 
  
Figure 5: Boundary pixels rendered with mean pixel value of region (white pixels are interior pixels), edgel chains superimposed 
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International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B3. Vienna 1996