rity 
ave 
Ying Chen 
  
  
Fig. 2: Decomposition and reconstruction base on wavelet 
log; M,, f (x, y) < ja +log,(4) (6) 
In this paper, three different scale images are adopted to solve Lipschitz a and the status of a edge is detected 
according to following formulas, 
. « 1 " 
qz: discontinuity | 
g «o noise (7) 
nb: signal ] 
1 LINE MOMENT DESCRIPTION OF EDGE CONTOUR 
The edges detected can be expressed with direction chain code[ Lide Wu,1993]. Edge contour length ! and centroid 
coordinates X , y which describe contour characteristic would be written as moment] Ying,1998.4]. 
[= Ho =o = [ai =n, + Van, 
  
A nt 
= Bo! 
£ ? 
A fa 1 
  
Where: n, and n, indicate pixel number which chain code are even or odd respectively. m indicates original 
moment of an edge contour. 
n f ] 
m, S Al [5 + Ax, | 
n 1 ) 
Pio = 3 Al, Ji-i + 7 AV | 
i=} . ez Zz 
Central moments y, , of a contour can be derived from its chain code. 
  
International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B3. Amsterdam 2000. 179