noob: AttributeError: 'NoneType' object has no attribute 'tostring'

[tom]

not sure why im getting the error above. any ideas? thx

code:

fset_blob = image.findBlobs().sortArea()

print type(fset_blob)

print "--------------------"

for b in fset_blob:

  b.draw()

-----------------------------------------------------

output:

Traceback (most recent call last):

  File "test.py", line 48, in <module>

    b.draw()

  File "/usr/local/lib/python2.7/dist-packages/SimpleCV-1.2-py2.7.egg/SimpleCV/Features/Blob.py", line 400, in draw

    masksurface = Image(maskbit).getPGSurface()

  File "/usr/local/lib/python2.7/dist-packages/SimpleCV-1.2-py2.7.egg/SimpleCV/ImageClass.py", line 592, in getPGSurface

    self._pgsurface = pg.image.fromstring(self.getPIL().tostring(), self.size(), "RGB")

AttributeError: 'NoneType' object has no attribute 'tostring'

[Jay Rambhia]

Hey,
I think you are using an older version of SimpleCV. Could you look it up ?
according to the latest version,
self._pgsurface = pg.image.fromstring(self.toRGB().getBitmap().tostring(), self.size(), "RGB")

I think this could be the problem, but I am not completely sure.
So, if you can, try and upgrade your simpleCV library.

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Jay Rambhia,
Undergraduate Student,
Mechanical Engineering,
BITS,Pilani Goa Campus
Contact : 09967119686
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[tom]

thx, i did the a new install of ubuntu 11.1 as desctibed here:

http://simplecv.org/doc/installation.html#ubuntu-11-10

but when i search:

~$ apt-cache search SimpleCV

texlive-latex-extra - TeX Live: LaTeX supplementary packages

python-simplecv - Make Computers See with SimpleCV, the Python Framework for M

not sure what else to install....

any ideas?

thx again

[Jay Rambhia]

Download complete library from GitHub. https://github.com/ingenuitas/SimpleCV
and install using $ sudo python setup.py install (after changing the directory)
It works for me.

[tom]

just run into this:

sudo apt-get install libopencv2.3

Reading package lists... Done

Building dependency tree       

Reading state information... Done

The following NEW packages will be installed:

  libopencv2.3

0 upgraded, 1 newly installed, 0 to remove and 83 not upgraded.

Need to get 0 B/11.5 MB of archives.

After this operation, 88.1 MB of additional disk space will be used.

(Reading database ... 94125 files and directories currently installed.)

Unpacking libopencv2.3 (from .../libopencv2.3_2.3.1-3_i386.deb) ...

dpkg: error processing /var/cache/apt/archives/libopencv2.3_2.3.1-3_i386.deb (--unpack):

 trying to overwrite '/usr/lib/libopencv_highgui.so.2.3.1', which is also in package libopencv-highgui2.3 2.3.1-4ppa1

E: Sub-process /usr/bin/dpkg returned an error code (1)

[Jay Rambhia]

I don't think there's any problem with your opencv library.
And I don't know why you got that error while installing libopencv.
Try installing latest simpleCV from GitHub, and check if you are still getting the same error or not.

[tom]

will try - thank you

[Krishna Mohan]

Hi Tom,
  I ran into somewhat similar problem with opencv before (my ubuntu was already a mess with all my experiments at the time)
I did a fresh install of ubuntu 11.10 and used the following to get opencv and subsequently simplecv working

http://thebitbangtheory.wordpress.com/2011/10/23/how-to-install-opencv-2-3-1-in-ubuntu-11-10-oneiric-ocelot-with-python-support/