fresh install, bwmorph running into Index exceeds matrix dimension

[Charlton Galvarino]

Hi, list.

I'm brand new to Octave and am afraid that I don't have Matlab experience to back me up.  I have scoured the archives and googled around, but I haven't found any clear winners as to why a brand new Octave install fails as follows:

octave:2> BW = imread('/home/cpurvis/Temp/20091002fronts.gif');
octave:3> BW2 = bwmorph(BW,'thin');
error: A(I): Index exceeds matrix dimension.
error: called from:
error:   /usr/local/octave/share/octave/packages/image-1.0.10/applylut.m at line 44, column 4
error: evaluating argument list element number 1
error: evaluating argument list element number 1
error:   /usr/local/octave/share/octave/packages/image-1.0.10/bwmorph.m at line 551, column 5
octave:3>

This is a valid image, and I can even write it back out to a new .gif, and it looks fine.  The image stats are as follows:

Driver: GIF/Graphics Interchange Format (.gif)
Size is 2797, 2234
Coordinate System is `'
Corner Coordinates:
Upper Left  (    0.0,    0.0)
Lower Left  (    0.0, 2234.0)
Upper Right ( 2797.0,    0.0)
Lower Right ( 2797.0, 2234.0)
Center      ( 1398.5, 1117.0)
Band 1 Block=2797x1 Type=Byte, ColorInterp=Palette
  Metadata:
    GIF_BACKGROUND=0
  Color Table (RGB with 4 entries)
    0: 255,255,255,255
    1: 206,206,206,255
    2: 0,0,0,255
    3: 0,0,0,255

I can printf the size of the image after it's loaded, no problem.  Converting it to .jpg results in the same error.

Am I missing something very obvious that is a result of me being an Octave newbie?  If so, I'm dreadfully sorry, and I can continue to printf debug messages as I work backwards.

My stats are as follows and my thanks is in advance!

----------------------------------------------------------------------
GNU Octave Version 3.2.3
GNU Octave License: GNU General Public License
Operating System: Linux 2.6.9-55.0.6.ELsmp #1 SMP Thu Aug 23 11:11:20 EDT 2007 i686
----------------------------------------------------------------------
Package Name  | Version | Installation directory
--------------+---------+-----------------------
     control *|  1.0.11 | /usr/local/octave/share/octave/packages/control-1.0.11
       image *|  1.0.10 | /usr/local/octave/share/octave/packages/image-1.0.10





Charlton Galvarino
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charlton@...

P.O. Box 50960
Columbia, SC 29250


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[Søren Hauberg]

ons, 04 11 2009 kl. 13:14 -0500, skrev Charlton Galvarino:
> octave:2> BW = imread('/home/cpurvis/Temp/20091002fronts.gif');
> octave:3> BW2 = bwmorph(BW,'thin');
> error: A(I): Index exceeds matrix dimension.
> error: called from:
> error:   /usr/local/octave/share/octave/packages/image-1.0.10/applylut.m at line 44, column 4
> error: evaluating argument list element number 1
> error: evaluating argument list element number 1
> error:   /usr/local/octave/share/octave/packages/image-1.0.10/bwmorph.m at line 551, column 5
> octave:3>

I cannot replicate this problem. Can you send the image to me or make it
available somewhere on the internet so I can try?

One problem might be that your image is not binary. What do you get when
you run

  class (BW)

you should get 'logical' if your image is indeed binary.

Søren

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[Charlton Galvarino]

> One problem might be that your image is not binary. What do you get when
> you run
>
>   class (BW)
>
> you should get 'logical' if your image is indeed binary.

You hit the nail on the head.  Once I made it monochrome, everything works wonderfully.

Thank you for such a quick response.

Charlton

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