myshrink2.m

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 function J = myshrink2(I,k1,k2)
% myshrink2.m: 基于局部子块的图像缩小程序：其中，k1,k2分别为行、列
%    的缩小因子。
%    局部子块F(i,j)的确定：
%    F(i,j) = I(r1:r2,c1:c2);
%    J(i,j) = sum(F)/N,其中，N是子块像素个数
if k1 > 1 || k2 > 1
    error('input k1 or k2 is error');
end
I=double(I);
k1 = 0.1; k2 = 0.21;
di = 1/k1; dj = 1/k2;
[r,c] = size(I);
si = round(r*k1); sj = round(c*k2);
for i = 1:si
    for j = 1:sj
        r1 = di*(i-1) + 1;
        r2 = di*i;
        c1 = dj*(j-1) + 1;
        c2 = dj*j;
        if round(di*i) > r
            if round(dj*j) <= c
               J(i,j) = sum(sum(I(r1:r,c1:c2)))/((r-r1)*(c2-c1));
            else
                J(i,j) = sum(sum(I(r1:r,c1:c)))/((r2-r1)*(c-c1));
            end
        else
            if round(dj*j) <= c
                J(i,j) = sum(sum(I(r1:r2,c1:c2)))/((r2-r1)*(c2-c1));
            else
                J(i,j) = sum(sum(I(r1:r2,c1:c)))/((r2-r1)*(c-c1));
            end
        end
    end
end
return