colorize.m

把黑白照片转换成彩色照片的数值优化算法。

g_name='example.bmp';
c_name='example_marked.bmp';
out_name='example_res.bmp';

%set solver=1 to use a multi-grid solver 
%and solver=2 to use an exact matlab "\" solver
solver=2; 

gI=double(imread(g_name))/255;
cI=double(imread(c_name))/255;
colorIm=(sum(abs(gI-cI),3)>0.01);
colorIm=double(colorIm);

sgI=rgb2ntsc(gI);
scI=rgb2ntsc(cI);
   
ntscIm(:,:,1)=sgI(:,:,1);
ntscIm(:,:,2)=scI(:,:,2);
ntscIm(:,:,3)=scI(:,:,3);


max_d=floor(log(min(size(ntscIm,1),size(ntscIm,2)))/log(2)-2);
iu=floor(size(ntscIm,1)/(2^(max_d-1)))*(2^(max_d-1));
ju=floor(size(ntscIm,2)/(2^(max_d-1)))*(2^(max_d-1));
id=1; jd=1;
colorIm=colorIm(id:iu,jd:ju,:);
ntscIm=ntscIm(id:iu,jd:ju,:);

if (solver==1)
  nI=getVolColor(colorIm,ntscIm,[],[],[],[],5,1);
  nI=ntsc2rgb(nI);
else
  nI=getColorExact(colorIm,ntscIm);
end

figure, imshow(nI)

imwrite(nI,out_name)
   
  

%Reminder: mex cmd
%mex -O getVolColor.cpp fmg.cpp mg.cpp  tensor2d.cpp  tensor3d.cpp