Matlab实现对图像抖动算法

%********************************Task 1***********************************

% For a 8-bit gray image (lena.bmp)

% Use a dithering matrix (4*4), generate the dithered image.

%*************************************************************************

%function defined

function []=dither1()

%import the 8-bit gray image (lena.bmp)

I=imread('image/lena.bmp');

[I_length,I_width]=size(I);

%Define the 4*4 matrix

D = [0,8,2,10; 12,4,14,6; 3,11,1,9; 15,7,13,5];

%Output matrix

O=zeros(4*I_length,4*I_width);

%Map the image (0~255) to a new scope (0~16) and dither

divide=256/17;

tmp_I=I./(divide);

for x = 1:I_length

for y = 1:I_width

for p = 1:4

for q = 1:4

if tmp_I(x,y)>= D(p,q)

O(4 *(x-1) + p,4 *(y-1) + q) = 1;

else

O(4 *(x-1) + p,4 *(y-1) + q) = 0;

end

end

end

end

end

%show the result

subplot(121),imshow(I),title('8-bit gray lena.bmp');

subplot(122),imshow(O),title('dithered image');

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