matlab程序的matting

function [Gx,Gy,G3,G4]=getGMatByMask(w,h,mask) imgSize=w*h; dS=[1,-1]; filtSizeS=1; %indsGx1=[]; indsGx2=[]; valsGx=[]; %indsGy1=[]; indsGy2=[]; valsGy=[]; indsGx1=zeros(imgSize*2,1); indsGx2=zeros(imgSize*2,1); valsGx=zeros(imgSize*2,1); indsGy1=zeros(imgSize*2,1); indsGy2=zeros(imgSize*2,1); valsGy=zeros(imgSize*2,1); indsG31=zeros(imgSize*2,1); indsG32=zeros(imgSize*2,1); valsG3=zeros(imgSize*2,1); indsG41=zeros(imgSize*2,1); indsG42=zeros(imgSize*2,1); valsG4=zeros(imgSize*2,1); indy=0; indx=0; ind3=0; ind4=0; for x=1:w-1, for y=1:h, if ((~mask(y,x))&(~mask(y,x+1))) continue end for disp=0:filtSizeS, indx=indx+1; indsGx1(indx)=imIndexToVect(y,x,h); indsGx2(indx)=imIndexToVect(y,x+disp,h); valsGx(indx)=dS(disp+1); end end end for x=1:w, for y=1:h-1, if ((~mask(y,x))&(~mask(y+1,x))) continue end for disp=0:filtSizeS, indy=indy+1; indsGy1(indy)=imIndexToVect(y,x,h); indsGy2(indy)=imIndexToVect(y+disp,x,h); valsGy(indy)=dS(disp+1); end; end; end for x=1:w-1, for y=1:h-1, if ((~mask(y,x))&(~mask(y+1,x+1))) continue end for disp=0:filtSizeS, ind3=ind3+1; indsG31(ind3)=imIndexToVect(y,x,h); indsG32(ind3)=imIndexToVect(y+disp,x+disp,h); valsG3(ind3)=dS(disp+1); end end end for x=1:w-1, for y=2:h, if ((~mask(y,x))&(~mask(y-1,x+1))) continue end for disp=0:filtSizeS, ind4=ind4+1; indsG41(ind4)=imIndexToVect(y,x,h); indsG42(ind4)=imIndexToVect(y-disp,x+disp,h); valsG4(ind4)=dS(disp+1); end; end; end; %'done inds' indsGx1=indsGx1(1:indx); indsGx2=indsGx2(1:indx); valsGx=valsGx(1:indx); indsGy1=indsGy1(1:indy); indsGy2=indsGy2(1:indy); valsGy=valsGy(1:indy); indsG31=indsG31(1:ind3); indsG32=indsG32(1:ind3); valsG3=valsG3(1:ind3); indsG41=indsG41(1:ind4); indsG42=indsG42(1:ind4); valsG4=valsG4(1:ind4); Gx=sparse(indsGx1,indsGx2,valsGx,imgSize,imgSize); Gy=sparse(indsGy1,indsGy2,valsGy,imgSize,imgSize); G3=sparse(indsG31,indsG32,valsG3,imgSize,imgSize); G4=sparse(indsG41,indsG42,valsG4,imgSize,imgSize);