How to detect the object in my picture that be horizontal vertical or spot ?

I have many pictures. as the picture below

1. Vertical
2. Horizontal
3. spot

What should I write the codes to detect specific my picture that is vertical horizontal or spot?

Please help me if you can^^

love you

Thank you for your attention ^^

Answer 1

[KSSV]

I = imread('spot.jpeg') ;
I = rgb2gray(I) ;

[y,x] = find(I==0) ;
%% Remove outliers 
idx = abs(x-mean(x))>3*nanstd(x) ;
idy = abs(y-mean(y))>3*nanstd(y) ;

id = idx|idy ;
x(id) = [] ; y(id) = [] ;

%% Get length and breadth 

x0 = min(x) ; x1 = max(x) ; 
y0 = min(y) ; y1 = max(y) ; 

L = y1-y0 ;
B = x1-x0 ;

figure
imshow(I)
hold on
plot(x,y,'.r')

If L > B, than vertical

If L < B, than horizontal