[Octave-bug-tracker] [bug #29696] imread reads in multi-page TIFF image as empty array with incorrect dimension

[Qianqian Fang]

URL:
  <http://savannah.gnu.org/bugs/?29696>

                 Summary: imread reads in multi-page TIFF image as empty
array with incorrect dimension
                 Project: GNU Octave
            Submitted by: fangq
            Submitted on: Wed 28 Apr 2010 02:23:37 AM GMT
                Category: Libraries
                Severity: 3 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: Qianqian Fang
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.2.3
        Operating System: GNU/Linux

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Details:

The 3.2.x versions of octave gave me incorrect results when reading a
multi-page TIFF image.

* Steps to reproduce:

1. Download the TIFF file in the attachment or from external link [1]

2. run the following command
  brain=imread('headseg.tif',1:256); 

3. clear brain, and run the following command:
  for i=1:256
     brain(:,:,i)=imread('headseg.tif',i);
  end 

* Expected results:

For the above Step 2, the array brain is expected to have dimension 
256x256x256 with many non-zero elements (the file is a segmented brain
volume).

The same out come is expected for Step 3.

* Actual results:

For step 2, octave returns an array with dimension 256x256x1x256, all
elements are 0s.

For step 3, octave returns an array with the expected dimensions, but again,
all elements are 0s.


[1]
https://orbit.nmr.mgh.harvard.edu/plugins/scmsvn/viewcvs.php/*checkout*/trunk/iso2mesh/sample/headseg.tif?root=iso2mesh





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