灰度图转化为彩色图像（MATLAB实现）

function R=gray2rgb(img1,img2) %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %This Program converts a gray image ro RGB image based on the colors of the destination image. The better the destination image match with the source % %gray image, the better the coloring will be. The program takes some time as the searching time is high. You can decrease the searching time by taking % %only samples from the used color image but quality may decrease. U can use jittered sampling for improving running speed. % % % % You can use also use the attahed test images, Use the following combinations for better result nature1.jpg(as img1) and nature2.jpg(as img2) or % % test1.jpg(as img1) and test2.jpg (as img2) % % % % % Usage % % gray2rgb('nature1.jpg','nature2.jpg'); % % % % Authors : Jeny Rajan % % Chandrashekar P.S % %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % img1 - Source Image (gray image) % img2 - Selected color image for coloring the gray image. tic clc; warning off; imt=imread(img1); ims=imread(img2); [sx sy sz]=size(imt); [tx ty tz]=size(ims); if sz~=1 imt=rgb2gray(imt); end if tz~=3 disp ('img2 must be a color image (not indexed)'); else imt(:,:,2)=imt(:,:,1); imt(:,:,3)=imt(:,:,1); % Converting to ycbcr color space nspace1=rgb2ycbcr(ims); nspace2= rgb2ycbcr(imt); ms=double(nspace1(:,:,1)); mt=double(nspace2(:,:,1)); m1=max(max(ms)); m2=min(min(ms)); m3=max(max(mt)); m4=min(min(mt)); d1=m1-m2; d2=m3-m4; % Normalization dx1=ms; dx2=mt; dx1=(dx1*255)/(255-d1); dx2=(dx2*255)/(255-d2); [mx,my,mz]=size(dx2); %Luminance Comparison disp('Please wait..................'); for i=1:mx for j=1:my iy=dx2(i,j); tmp=abs(dx1-iy); ck=min(min(tmp)); [r,c] = find(tmp==ck); ck=isempty(r); if (ck~=1) nimage(i,j,2)=nspace1(r(1),c(1),2); nimage(i,j,3)=nspace1(r(1),c(1),3); nimage(i,j,1)=nspace2(i,j,1); end end end rslt=ycbcr2rgb(nimage) figure,imshow(uint8(imt)); figure,imshow(uint8(rslt)); R=uint8(rslt); toc end