International Archives of Photogrammetry and Remote Sensing,Vol. 32, Part 7-4-3 W6, Valladolid, Spain, 3-4 June, 1999 
64 
Figure 4: Synthetic scenes -.From top to bottom: (1) syn 
thetic images, left ’’Rosette”, right ’’bar codes”; (2) strength 
a, (3) direction (p and (4) anisotropy q. All three texture mea 
sures computed using 3 x 3 -Sobel as differentiation kernel, 
with s = 0.7, and integration kernel t = 0.5. 
Figure 5: Natural scenes: From top to bottom: (1) 
synthetic images, left "Avenches”, right ’’Pentagon”; (2) 
strength a, (3) direction 0 and (4) anisotropy q. All three 
texture measures computed usings x 3-Sobel as differen 
tiation kernel, with s = 0.7, and integration kernel t = 0.5