使用matlab实现灰度图像到彩色图像转换

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');  
% 
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%               Authors : Jeny Rajan                                                                                                                    %
%                         Chandrashekar P.S                                                                                                             %                                     
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% img1 - Source Image  (gray image)                                                                                                        
% img2 - Selected color image for coloring the gray image. 
tic
clc;
warning off;
imt=imread('E:\matlab2008\work\hehui.jpg');
ims=imread('E:\matlab2008\work\lefkada (3).jpg');
[sx sy sz]=size(imt);
[tx ty tz]=size(ims);
if sz~=1
    imt=rgb2gray(imt);
end