[vtkusers] Problem in loading big images using vtkimagereader

[Arunachalam Kana]

Hi Mike,

I have tested the same code in linux system and it works. I am able to load dataset >3Gb.
I think your theory is right. Can you please explain why this happens and how can i solve this problem to load large image data set in windows system.

Kana 

-----Original Message-----
From: vtkusers-bounces at vtk.org [mailto:vtkusers-bounces at vtk.org] On Behalf Of Arunachalam Kana
Sent: 11 August 2010 10:00
To: vtkusers at vtk.org
Subject: Re: [vtkusers] Problem in loading big images using vtkimagereader

Hi Mike,

 I have not tried the code on linux OS, but going to try it now. I would like to know your theory, which makes you think that vtkimagereader2.cxx will work on linux 64 bit machine and not in windows xp 64 bit machine. Which part of the code in vtkimagereader2.cxx makes you to think this ?

I would like to point out that, in our algorithms I was using vtkmetaimagereader.cxx to read files. And I had no problem in loading image >4Gb size in a windows xp 64 bit m/c. Is there a difference between the vtkmetaimagereader.cxx and vtkimagereader2.cxx ?

Kana 

-----Original Message-----
From: vtkusers-bounces at vtk.org [mailto:vtkusers-bounces at vtk.org] On Behalf Of Michael Jackson
Sent: 10 August 2010 19:42
To: VTK Users
Subject: Re: [vtkusers] Problem in loading big images using vtkimagereader

Are you able to run your code/data on a 64 bit Linux/OSX box to see if  
it works there? I have a theory but it may be a bad theory based off a  
very casual look at vtkImageReader2.cxx file

Mike Jackson

On Aug 10, 2010, at 1:27 PM, Arunachalam Kana wrote:

> Hi Michael,
>
> 	My system is a 64bit with windows xp. I used cmake to generate  
> visual studio project for
> Vtk. I generated the projects using option "visual studio 9 2008  
> Win64". So i think the vtk libraries are also built for 64 bit  
> machine.
>
> Kana.
>
> -----Original Message-----
> From: vtkusers-bounces at vtk.org [mailto:vtkusers-bounces at vtk.org] On  
> Behalf Of Michael Jackson
> Sent: 10 August 2010 18:42
> To: VTK Users
> Subject: Re: [vtkusers] Problem in loading big images using  
> vtkimagereader
>
> Are you compiling VTK as a 64 bit set of libraries? Possibly sounds
> like there is a 32/64 bit threshold being passed.
>
> ___________________________________________________________
> Mike Jackson                      www.bluequartz.net
> Principal Software Engineer       mike.jackson at bluequartz.net
> BlueQuartz Software               Dayton, Ohio
>
> On Aug 10, 2010, at 11:51 AM, Arunachalam Kana wrote:
>
>> Hi VtkUsers,
>>
>> I have problem in the vtkimagereader2. Following below is the code
>> used to read image.
>>
>> vtkImageReader2 * reader = vtkImageReader2::New();
>>                reader->SetFileName( file.toAscii().data() );
>>                reader->SetDataScalarType( scalarType );
>>                reader->SetHeaderSize( headersize );
>>                reader->SetDataExtent( extent );
>>                reader->SetDataSpacing( spacing );
>>                reader->SetDataOrigin( origin );
>>                reader->SetFileDimensionality( dim );
>>                reader->UpdateWholeExtent();
>>                reader->Update();
>>
>> The code works well when I read an image <= 3Gb(approx). But it does
>> not read the full
>> Image if the image is >= 3Gb. The image data set i handle is > 3Gb.
>>
>> I would like to have  some suggestion to use vtkimagereader and
>> solve this problem.
>>
>> Thank you,
>> Regards,
>> Kana Arunachalam Kannappan
>> Research Associate
>> FH OÖ Forschungs & Entwicklungs GmbH
>> Stelzhamer Strasse 23,
>> 4600 Wels,
>> Austria.
>> Phone: +43 (0)7242 72811 -4420
>> kana.arunachalam at fh-wels.at
>> www.fh-ooe.at; www.3dct.at
>>
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