[Insight-users] fast assign ITK image to an array?

[Dongfeng Han]

I also have one concern.
In fact, I want to use memcpy. to do such operation
 memcpy( imgDest->GetBufferPointer(), imgDrc->GetBufferPointer(),
sizrof(pixelType) * x_size*y_size*z_size)

Can we make sure  img->GetBufferPointer() is continuous?;
That means , ITK will allocate memory continuously?
I guess, ITK should support allocate memory slice by slice.

anyone can confirm it?

Best
dongfeng


On Sun, Apr 17, 2011 at 2:11 PM, Neil Panjwani <paniwani at gmail.com> wrote:

> I have some code that treats images as arrays. Using GetBufferPointer()
> works perfectly. You can in fact set the value using the normal notation:
>
> PixelType * imgArray = img->GetBufferPointer();
>
> imgArray[100] = 1;
>
> I don't think there is any padding. I'm unfamiliar with the
> ImportImageFilter.
>
> - Neil
>
> On Sun, Apr 17, 2011 at 5:06 AM, Francis Girard <
> francis.girard07 at gmail.com> wrote:
>
>> Hi,
>>
>> Can we iterate safely using this raw buffer pointer?
>>
>> Maybe there is some padding to ensure some byte alignment property?
>>
>> Also if there is a GetBufferPointer notice that there is no
>> SetBufferPointer. So I don't think you can just set some buffer pointer as
>> is the case with some C++ STL containers. With that API, you will at least
>> need to make a copy of the contents, and even then we must make sure that
>> there is enough allocated memory.
>>
>> After all, what would be the usefulness of the "ImportImageFilter" if we
>> could simply and safely set a raw buffer pointer?
>>
>> And finally what precisely the  "ImportImageFilter" does under the hood?
>> Apprently it does _NOT_ make a copy of your buffer pointer. So maybe that is
>> fast. But I am not sure of what I am saying.
>>
>> Thanks
>>
>> Francis
>>
>>
>>
>>
>> 2011/4/17 Neil Panjwani <paniwani at gmail.com>
>>
>>> You can access the image in 1D C++ array form using the GetBuferPointer()
>>> function.
>>>
>>> - Neil
>>>
>>>
>>> On Sat, Apr 16, 2011 at 8:53 PM, Dongfeng Han <handongfeng at gmail.com>wrote:
>>>
>>>> Hello everyone,
>>>> Anyone know how to fast assign ITK image data to an c++ array?
>>>> The common approach is to use the iterator of  the ITK image and assign
>>>> the c++ array.
>>>> Any other fast way?
>>>> Best
>>>> df
>>>>
>>>>
>>>> _____________________________________
>>>> Powered by www.kitware.com
>>>>
>>>> Visit other Kitware open-source projects at
>>>> http://www.kitware.com/opensource/opensource.html
>>>>
>>>> Kitware offers ITK Training Courses, for more information visit:
>>>> http://www.kitware.com/products/protraining.html
>>>>
>>>> Please keep messages on-topic and check the ITK FAQ at:
>>>> http://www.itk.org/Wiki/ITK_FAQ
>>>>
>>>> Follow this link to subscribe/unsubscribe:
>>>> http://www.itk.org/mailman/listinfo/insight-users
>>>>
>>>>
>>>
>>> _____________________________________
>>> Powered by www.kitware.com
>>>
>>> Visit other Kitware open-source projects at
>>> http://www.kitware.com/opensource/opensource.html
>>>
>>> Kitware offers ITK Training Courses, for more information visit:
>>> http://www.kitware.com/products/protraining.html
>>>
>>> Please keep messages on-topic and check the ITK FAQ at:
>>> http://www.itk.org/Wiki/ITK_FAQ
>>>
>>> Follow this link to subscribe/unsubscribe:
>>> http://www.itk.org/mailman/listinfo/insight-users
>>>
>>>
>>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.itk.org/pipermail/insight-users/attachments/20110419/43ac4c6c/attachment.htm>