Double The Size of an Image using Bi-linear Interpolation

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%================== Program to double the size of an Image ===================%

A=imread('pic1.tif');
[M N]=size(A);
B=uint8(zeros(2*M,2*N));
for i=1:M
    for j=1:N
        B(2*i-1,2*j-1)=A(i,j);
        B(2*i,2*j-1)=A(i,j);
        B(2*i-1,2*j)=A(i,j);
        B(2*i,2*j)=A(i,j);
    end
end
C=B;
[M N]=size(B);
mask=[0, 1, 0;1, 0, 1;0, 1, 0;];
const_mat=zeros(1,4);
for i=1:M
    for j=1:N
        mat=zeros(1,4);
        S=zeros(4,4);
        m=1;
        for x=1:3
            for y=1:3
                if(((i+x-2)<M &&(j+y-2)<N)&&((i+x-2)>0 && (j+y-2)>0))
                    if(mask(x,y))
                        S(m,:)=[(i+x-2),(j+y-2),(i+x-2)*(j+y-2),1];
                        mat(1,m)=B(i+x-2,j+y-2);
                        m=m+1;
                    end
                end
            end
        end
        const_mat=mat*pinv(S');
        C(i,j)=const_mat(1,1)*i+const_mat(1,2)*j+const_mat(1,3)*i*j+const_mat(1,4);
    end
end
figure;imshow(A);   % displaying input image
figure;imshow(C);  % displaying output image

%==================================================================%
Input Image


output Image

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