% zadaci za kolokvijum iz Raclab 2, jun 2017
clear
clc

% 1. zadatak
% I=imread('cameraman.tif');
% I=double(I);
% I2=I(1:128,:);
% I3=I2.^0.3;
% I4=I2.^1.8;
% subplot(1,3,1), imshow(I2,[]), title('Orig')
% subplot(1,3,2), imshow(I3,[]), title('gama 0.3')
% subplot(1,3,3), imshow(I4,[]), title('gama 1.8')

% 2. zadatak
% I=imread('cameraman.tif');
% I8=bitget(I,8);
% I7=bitget(I,7);
% I6=bitget(I,6);
% I5=bitget(I,5);
% I4=bitget(I,4);
% I3=bitget(I,3);
% I2=bitget(I,2);
% I1=bitget(I,1);
% 
% I678=128*I8+64*I7+32*I6;
% 
% imgDiff=(I-I678).^2;
% myMSE=(1/65536)*sum(sum(imgDiff));
% myPSNR=20*log10(255/sqrt(myMSE));

% 3. zadatak
% I=imread('cameraman.tif');
% I2=I(1:128,:);
% I3=imnoise(I2,'salt & pepper', 0.04);
% I4=ordfilt2(I3, 1, ones(5));
% I5=ordfilt2(I3, 25, ones(5));
% I6=ordfilt2(I3, 13, ones(5));
% subplot(2,3,1), imshow(I2)
% subplot(2,3,2), imshow(I3)
% subplot(2,3,4), imshow(I4)
% subplot(2,3,5), imshow(I5)
% subplot(2,3,6), imshow(I6)