ni_zhiluan.m

图像置乱

function [image1,image2] = ni_zhiluan(image)

image = double(image);
[m n] = size(image);
image1 = zeros(m,n);
image2 = zeros(m,n);

%对image的列进行偶数列的逆插值

M_lie = 1;
image_temp = image;
for j = n:-2:2
    image_temp(:,2*M_lie) = image(:,j);
    M_lie = M_lie+1;
end

% 把image_temp的奇数行赋给image1的奇数行

odd = 1;
for i=1:2:m-1
   image1(2*odd-1,:) = image_temp(i,:);
   odd = odd + 1;
end

%把image_temp的偶数行逆赋给image2的偶数行

even = 1;
for i=m:-2:2
    image2(2*even,:) = image_temp(i,:);
    even = even + 1;
end

image1 = double(image1);
image2 = double(image2);

for i=1:m
    
    if(mod(i,2)==1)                     %对image1的偶数行进行填充
        if(i == m-1)
            image1(i+1,:) = image1(i,:);
        else
            image1(i+1,:) = (image1(i,:)+image1(i+2,:))/2;
        end
    end
    
    if(mod(i,2)==0)                     %对image1的奇数行进行填充
        if(i == 2)
            image2(i-1,:) = image2(i,:);
        else
            image2(i-1,:) = (image2(i,:)+image2(i-2,:))/2;
        end
    end
end