[Insight-users] Failed to allocate memory

[Jinkoo Kim]

Hi Jewel,

Image size may be too big:

two input images: 340MB x 2 = 680 MB
deformation vector field (float): 340MB x 1 x 2 (=float/short ratio) = 680MB

==> 1360MB

if you are using three levels
==> 1360MB + 760MB/8(=170MB) +760MB/8/8(=21MB) = 1550MB

Including intermediate memories, like addtional vector fields (1360MB) for data swapping, smoothing, gradient calculation... I would say the program need more than 2GB.

Regards,
Jinkoo





>>> "zhihong hu" <zhihonghu21 at hotmail.com> 3/16/2008 10:08 AM >>>
Dear All
 
I am trying to register two sheep lung images by using Demons Deformable Registration. The images are 3 dimensional and each is about 339MB. The image format is Analyze file format. 
 
I have tried 3 different programms. One is DeformableRegistration2.cxx from the ITK Software Guide. I also tried Diffeomorphic Demons by Tom Vercauteren group and Thirion Demons by Hans Jonson group in the University of Iowa.
When I registered the images, all have shown the problem that " Failed to allocate memory". I tried a few computers both in linux and under windows. The computer memory should be in GB. 
 
However, I also tried some small images and all works well.
 
I am a newer in image processing. I can not figure out the problem. Is it possible the memory allocation method does not work for the large images? Please help me. Thanks.
 
Jewel from University of Iowa
 
 
 
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