[Numpy-discussion] create a numpy array of images

Sturla Molden sturla@molden...
Tue Feb 1 07:49:39 CST 2011


Den 1. feb. 2011 kl. 11.20 skrev "totonixsame@gmail.com" <totonixsame@gmail.com 
 >:

> I have one more question: how to avoid the limitation of memoryerror  
> in
>>
>> numpy. as I have like 200 images to stack in the numpy array of say
>> 1024x1344 resolution.. have any idea apart from downsampling?
>
> Take a look at numpy.memmap or h5py [1].
>

memmap will not help unless he uses 64 bit Python, in which case he  
can just buy more RAM if he has too little. I suspect he is running  
out of virtual memory, not physical, for which 64 bit is the easiest  
solution. It is not possible to compensate for lack of virtual memory  
(typically 2GB limit with 32 bit) by memory mapping file into the  
already exhausted memory space.

Using a database like h5py will help too, unless he tries to extract  
them all at once.

Sturla 


More information about the NumPy-Discussion mailing list