IMAGE_PROCESSING LAB1

m=360;
n=360;
black_img=zeros(m,n);
imshow(black_img);
x1=10;
y1=50;
w=30;
h=40;
for i=1:m
    for j=1:n
        if(i>=y1)&&(i<=(y1+h))&&(j>=x1)&&(j<=x1+w)
        black_img(i,j)=255;
        end
    end
end
imshow(black_img);
???????????????
m=360;
n=360;
black_img=zeros(m,n);
imshow(black_img);
x1=10;
y1=50;
w=30;
h=40;
x2=x1+w;
y2=y1+h;
black_img(y1:y2,x1:x2)=255;
figure
imshow(black_img);
title('2');

?????????????????????????
black_img=uint8(255*rand(n,m));
figure;
imshow(black_img);

%image 10a
yc=n/2;% einai h mesaia sthlh
black_img1=zeros(m,n);
black_img1(:,yc)=255;%krataw oles tis grammes me (:)
figure;
imshow(black_img1);


%image 10b
black_img2=ones(m,n);
yline=m/2;% einai h mesaia sthlh

black_img2(yline,:)=0;%krataw oles tis grammes me (:)
figure;
imshow(black_img2);