Matlab数字图像处理基础：图像采样

>> I=imread(\'lena.bmp\');
>> I1=rgb2gray(I);
>> imshow(I1),title(\'a\');
>> I2=I1(1:2:end,1:2:end);
>> figure,imshow(I2),title(\'b\');
>> I3=I1(1:4:end,1:4:end);
>> figure,imshow(I3),title(\'c\');
>> figure,subplot(2,2,1),imshow(I),title(\'color image\');
>> subplot(2,2,2),imshow(I1),title(\'512X512\');
>> subplot(2,2,3),imshow(I2),title(\'256X256\');
>> subplot(2,2,4),imshow(I3),title(\'128X128\');