International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXX V, Part B7. Istanbul 2004 
        
3. EXPERIMENTS AND RESULTS 
Five high resolution images with typical residential area 
(country residential area, urban residential area, rarefied and 
concentrated residential area) are selected for extraction 
experiment and the resolution is ranged from 3m to 15m. The 
extraction results are shown as Figure 5, the dark outlines are 
the extraction board of the residential area. 
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Fig 5 Results of the residential arca semi-automatic extraction 
Pixel error is taken as the accuracy assessment parameter and it 
can be simple calculated as the figure 6 shown. 
As figure 6 shown, the dark outline is the residential area edge 
which is extracted by the method proposed in this paper and the 
area M, of the dark outline is the semi-automatic extraction area. 
The white dark outline is the residential area edge which is the 
result of view identification. The area M; of the white outline is 
the actual measure area of residential area. Thus, the error 
extraction pixels and missing extraction pixel of residential arca 
can be determined as figure 6. Where 7 is the right extraction 
residential area, F is the error extraction residential area and /. 
is the missing extraction residential area. And the pixel number 
is taken to calculate the area. 
   
The right ration, error ration and missing ration of residential 
extraction can be calculated as following equation and these 
ratios can be used to analyse the extraction precision. 
F -M -M, (6) 
TM FE (7) 
L-M,-T (8) 
  
7 
Right Ratio = % 9 
gh atic a 0 9) 
  
L 
Mis sin Ratio = % (l1 
g x ^09 
> 
Error Ratio = a (11) 
M, 
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