Reflectance Map ambertian case =cos.=n·s= pp +99s+ R(p, p2+q2+1Vp3+q3+1 Reflectance Map Iso-brightness contour (Lambertian) cone of constant 0
• Lambertian case ( ) R(p q) p q p q pp qq I S S s s i , 1 1 1 cos 2 2 2 2 = + + + + + + = = ns = Reflectance Map (Lambertian) cone of constant i Iso-brightness contour Reflectance Map
Reflectance Map ambertian case iSo-brightness contour 0.9 R(q)=07 6.=90° 0.3 0.0 Note:R(p, g)is maximum when(p, q)=(ps, qs)
• Lambertian case 1.0 0.3 0.0 0.9 0.8 R(p,q) = 0.7 p q i = 90 ( + +1= 0) ppS qqS ( ) pS qS , iso-brightness contour Note: is maximum when R(p,q) ( ) ( ) p q pS qS , = , Reflectance Map
Reflectance Map EXample Brightness as a function of surface orientation Lambertian iso-brightnes surface contour 08 0.9 R p,q 0.7 (Pyq 6.=90° (P+qqs+1=0) R(p, q)= 1+ psp+ qsq 1+p2+q21+p32+q32 0:0
Reflectance Map Example • Brightness as a function of surface orientation 1.0 0.3 0.0 0.9 0.8 R(p,q) = 0.7 p q i = 90 ( + +1= 0) ppS qqS ( ) pS qS , iso-brightness contour Lambertian surface