% ex_08_09_1.m;   習題 8.9

clear all;clc;
I=imread('girl.bmp');
A=double(I);
B=zeros(size(A));
C=zeros(size(A));
%
C2=my_DCT(A,2);
C4=my_DCT(A,4);
C6=my_DCT(A,6);
subplot(2,2,1); imshow(I);
subplot(2,2,2); imshow(C2); 
subplot(2,2,3); imshow(C4); 
subplot(2,2,4); imshow(C6);