myzoom1.m

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function J = myzoom1(I,k1,k2)
% myzoom1.m: 基于邻近插值的图像放大程序，其中，k1,k2分别 
%    是行、列的放大倍数。J为放大输出图像
%          
% I = imread('D:\MATLAB7.0\images\FigProb9.20(left).jpg');
% I = double(I);
% I = [1 2 3;4 5 6;7 8 9];

if k1 < 1 || k2 < 1
    error('input k1 or k2 is error');
end
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
di = 1/k1; dj = 1/k2;
[r,c] = size(I);
for i = 1:r
    for j = 1:c
        J(round(k1*(i-1)+1):round(k1*i),...
            round(k2*(j-1)+1):round(k2*j)) = I(i,j);
    end
end
return