pixel count in image

I am trying to calculate the lengt of different lines in one image all labeled, i used the code below in order to obtain the figure below, but i want to know what amount of pixels are horizontal, vertical and diagonal (eg. in this picture 5 diagonal and 1 vertical).

Is there a way to get this data?

imagesc(bwmorph(I_temp,'skel'))

Answer 1

[KSSV]

[a,b]=hist(I_temp(:),unique(I_temp(:)))

[Bart Smulders]

this just gives me a value of a=1 and b=1, am i doing something wrong in my code?

clear all; clc;

cur_dir = 'C:\RESULTS';

I = double(imread([cur_dir '\proccesed\424.bmp']));

BW = logical(I); 

L = bwlabel(BW,4);

Data = regionprops(L,'All');

 stats = regionprops('table',L,'BoundingBox','area');
 area_values = [stats.Area];
 idx = find((10 <=area_values) & (area_values <= 2000));
 h=ismember(L, idx);

I_temp = Data(1).Image; 

imagesc(I_temp);
imagesc(bwmorph(I_temp,'skel'))

[a,b]=hist(I_temp,unique(I_temp))

[KSSV]

Use I_temp(:)..edited the code.