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1、上海交通大学 硕士学位论文 基于遮片的素材编辑 姓名：赵明天 申请学位级别：硕士 专业：计算机应用技术 指导教师：马利庄;肖双九 20070101 3?KW+JEe E 2Al?)8Eu |#n!OO ?JEn|i! KO?nc!?XcN 1?A9cN3E,Ky Cc5E83KJ zz EOa?p Ep?, 5 %vkL(?uy ?1?n E,?J?6+ /?60a/u?60 ?1.E,Nlen?1 1. /Cz UCcN)N5Cz ?JL5m .yA? 2. C/ 3mL5A? |C/m/NC/L)C/x 3. z ?1, A?nk, aO?J u?6EL?6J? . . . . . . .
2、 . . . .28 3.4Fig.3.3 with more boundary sample points and the generated grids. . . . . .28 3.5(3.2)C/(J . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31 3.5 The morphing results of fi g.3.2. . . . . . . . . . . . . . . . . . . . . . . . .31 4.1xM xMu . . . . . . . . . . . . . . . . . . .
3、 . . . . . . . . . . . . . . . . .35 4.1Some samples from our brush dictionary. The whole dictionary has much wider scales than the showed samples. . . . . . . . . . . . . . . . . . . . .35 4.23X(a)(,X(b)( 2, 2) |Kw(b)n . . . . . . . . . . .36 4.2 Infl uences of angle defi nition on (a) (, and (b) (
4、 2, 2 to the generated orientation fi eld. It is obvious that (b) is more reasonable. . . . . . . . . . .36 4.3w|xkSN O?J VcS 5K . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37 4.3 A discrete orientation fi eld. Some of the sketches (long ones in the fore- ground and irregular
5、ones in the background) are manully added for better artistic effects. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37 4.4ux?J(J(a)(d)O A (e)(h)Az?JO 1?J. . . . . . . . . . . . . . . . . . . . . . . .38 4.4Results of painting effects based on environment matte. (a)(d) are synthe-
6、 sized with the environment matte of the glass cup and different backgrounds, and (e)(h) are the corresponding stylized effects, with height fi elds of pig- ments and illumination effects. . . . . . . . . . . . . . . . . . . . . . . . .38 VIII ? ?M5( x(? 3e ?1J5SN? ?LJ ?z8N3(I (Jd U F2007c126F ? )?k
7、?3! 5 ?3Ik?x?Ef#N ?/? SN?k?1uKK k(J|A?2E)J . . (matting) . . (compositing) c8I?3cNl| (l5 ?Kl5cN#|I A?l5cN . . (matte) E/y319VK1857cKRejlander32 . ) . . . . . . . (the two ways of life) 1?20V?E ?KA?l / 21EL3 A?I?3 8 2|c?. . g . . 1 . (double exposure)B IA? BI?31E3 XcIcN20V60cVlahosJ37 cJc?H7 . . . .
8、(blue screen matting) 3 XO!MEuiLi?nK1 EziE3LL DRGBn?X? RGBX|RGBX cNl ycN?$ ? . i . . . (digital matte) kci;i;i)T(x)dx pd G2D(x;ci;i;i) = 1 2uv exp ? u2 22 u v2 22 v ? u = (x cx)cos (y cy)sin 6 1 V v = (x cx)sin + (y cy)cos .3nU/1 pd/Ow 2. J zbcN/ C C = (1 )B + T(c) dRizL1PX LAOO3RGBmL?:k?: yLvJ ZhuY
9、angJ uJ 12bB(s,t) cI(x,y)?zW(s,t)K. I(x,y) = F + R s=S,t=T X s=1,t=1 W(s,t)B(s,t) s=S,t=T X s=1,t=1 W(s,t) = 1 c?nzvuv|3/ mSLSLFCc AB)kcU?z 5m|F) W(s,t) = W(s)W(t) du./G 3e%N%Nm?1? 12 1 Cz backdrop P1 P2 P 0 1 P 0 2 P3 1 1 i i s 2.2LA.zpb kKuIP?3,s=N Fig. 2.2 A simplifi ed 2-D demonstration of the geometric process of refraction in environment matting. We assume angles of incidence and refraction have signs to indicate on which side of the normals they are located. s is named the mapping offset. backdrop P1 P2 P 0 1 P 0 2 P3 d R 2.3%N1LA5k O3N? Fig. 2.3The
