Cruz, Santiago 
Sobel Operator 
me 
Im 
ge 
zes 
ed 17.130 
nt, EE Kernel:Upper Horizontal 
ge atit 
1111-1 ALL : 
| 111 31511 | 
| ilii eiii 
| '. | Kernel: Kernel: 
| Left Vert. Right Vert. 
TT 
17311 : 
CT Kernel:Lower Horizontal 
of NS 
is 
st 
of 
es 
y. 
th : : ; : : : ; 
Figure 2. Linear line detecting templates (Prewitt filters) and comparison with Sobel operator for edge extraction. 
be 
or Selec : 
2) Image: E \RSINOL50\/magenes\precal Za tit | 
re 
ly Size: [97 column x 533 rows | 
n TDGEidow) || 
[Catumn =: 30-834 rows:35- 67 | 
Select | view | | 
d EDGE 2 (Right) 
or [column ;B41- BEG — rows: /2- 587 | 
is Sel | View | 
or EDGE 3 (Upper) 
s [oum :32.8M rows: 596 7] 
| 
t) Select | View | 
EDGE 4 (Left) 
i = [Estumn “2-25 rows:63- 594 | 
1€ ; : image Coordinates : Tu eee 
1s | OK | Hep | |Coumn 874rows:484 Select | View — 
2) 
e | 
Figure 3. Selections of search areas for format edges. Main window of the non-metric images inner orientation program 
under I.D.L. 5.0. 
| 
  
International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B5. Amsterdam 2000. 151