[Octave-bug-tracker] [bug #38464] IMAGE: bwlabel misses some pixels?

[Juan Pablo Carbajal]

URL:
  <http://savannah.gnu.org/bugs/?38464>

                 Summary: IMAGE: bwlabel misses some pixels?
                 Project: GNU Octave
            Submitted by: juanpi
            Submitted on: Mon 04 Mar 2013 06:54:08 PM GMT
                Category: Octave Forge Package
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Inaccurate Result
                  Status: None
             Assigned to: None
         Originator Name: juanpi
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.6.4
        Operating System: GNU/Linux

    _______________________________________________________

Details:


Execute the following script (fiel with data attached)


load "bwlabel_miss.mat"
imshow (imgNodes);
hold on
plot(nodes(:,1),nodes(:,2),"om")


You see that some nodes are not plotted. The matrix lblNodes (also in the
file) and the matrix nodes were generated with the following script


lblNodes = bwlabel (imgNodes, 4);
data     = regionprops (lblNodes, "Centroid");
nodes    = zeros (length (data), 2);
for i=1:length (data)
      nodes(i, [2 1]) = data(i).Centroid;
end


Apparently bwlabel nodes misses some of the pixels.
I checked that regionpropos is giving the correct result with other images.




    _______________________________________________________

File Attachments:


-------------------------------------------------------
Date: Mon 04 Mar 2013 06:54:08 PM GMT  Name: bwlabel_miss.mat  Size: 158kB  
By: juanpi

<http://savannah.gnu.org/bugs/download.php?file_id=27565>

    _______________________________________________________

Reply to this item at:

  <http://savannah.gnu.org/bugs/?38464>

_______________________________________________
  Message sent via/by Savannah
  http://savannah.gnu.org/