Jalal Amini 
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(a) (b) (c) 
Figure 1.Gray scale morphological operations on a profile, a) Original image profile, b) Dilation of original image 
profile, c) Erosion of original image profile 
  
5 EXPERIMENTAL INVESTIGATION 
Figure 2a shows part of an aerial image (256*256). Results of a 
pplying gray-scale mathematical morphology 
operators on figure 2a , have been shown in figures 2b and 2c. 
  
  
Matt 
and 1 
objec 
Figure 2. Gray scale mathematical morphology operations, a) Original image, b) Opened of image a, 
c) Closed of image b 
Figures 3a, 3b and 3c represent the binary images of figures 2a, 2b and 2c after segmentation made by ‘local 
standard deviation vs. global mean” algorithm that is more efficient than the others based on the investigations 
made in this research. 
Figure 3. Segmented images, a) Segmentation of 2a, b) Segmentation of 2b, c) Segmentation of 2c In ord 
delete 
As it is seen in figures 3, the original image is simplified by doing of the closing operator on the opened image. over tl 
Figures 4 show the edges of the figures 3 using the Canny operator. 
International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B3. Amsterdam 2000.