horizontal white black transitions of original image TC

i ve applied rlsa algorithm and labelled blocks in image, now i want to find features for block,one feature is given below:

 horizontal white-black transitions of original data (TC)

pls anyone help me to find this i wan to find using matlab any idea anyone ?pls?

[Walter Roberson]

Not enough information. The end of a labelled area does not necessarily represent a white to black transition: it could represent a transition from any non-black color to black.

Answer 1

[Image Analyst]

What is the rlsa algorithm? For black-white transitions, have you considered the gray level cooccurrence matrix, done by graycomatrix() in the Image Processing Toolbox. What is a transition. If you have

0 0 0 
0 1 0 
0 0 0

how many transitions is that? One? Eight? Two? Four?

[priya]

rlsa means run length smoothing algorithm no i haven't use glcm transition means change from 0 to 1, 1 to 0

[Image Analyst]

Try bwhitmiss() in the Image Processing Toolbox.

Answer 2

[Walter Roberson]

Transitions are indicated by

IM(:,1:end-1) ~= IM(:,2:end)

But how do you want this expressed as a "feature" ? If you want the index of them then the number could be different for each row.