[Insight-users] Questions about ITK4

[Arnaud Gelas]

Hi Hui,

The principle of Chan and Vese formulation is to assume there are two  
parts in your image: background and foreground and each of them are  
represented by a constant mean value.
In the implementation, we did follow the same principle, e.g. the mean  
is a scalar if you are working with scalar images, a vector if you are  
working with vector images, etc.

So, now you want to create a new term / formulation (there might be a  
specific name for that, but I am not aware of it).
Once you provide the mean image, you need to replace m_Mean by the  
pixel value for the given input location iP. In your special case,  
most likely you would only need to change m_Mean by m_MeanImage- 
 >GetPixel( iP )

Please, let us know if it works.

Best,
Arnaud


On Oct 2, 2011, at 1:55 PM, Hui Tang wrote:

> Dear Arnaud,
>
> That works!!Thanks!
> Now may I ask if my mean intensity is a constant over time but  
> varies in the image, so I will have a mean intensity image, how can  
> I add that to interal term? I know how to get and set image to get  
> the mean intensity image, but in update(), it seems that this->mean  
> can only be a scalar.......
>
> Do you have any idea on solve this?
>
> thanks,
>
> Best,
>
> Hui
>
>
>
> On Fri, Sep 30, 2011 at 3:14 PM, Arnaud Gelas <arnaud_gelas at hms.harvard.edu 
> > wrote:
> Hi Hui,
>
> Sorry, there was a typo in my previous email :-/...
>
> Here you go:
>
>     $ git checkout -t origin/v4.0b01
>
> Here are the *.h you are looking for
>
> $ find . | grep itkBinaryImageToWhitakerSparseLevelSetAdaptor.h
> ./Modules/Segmentation/LevelSetsv4/include/ 
> itkBinaryImageToWhitakerSparseLevelSetAdaptor.hxx
> ./Modules/Segmentation/LevelSetsv4/include/ 
> itkBinaryImageToWhitakerSparseLevelSetAdaptor.h
>
> To be able to use the LevelSetsv4, you should either build ITK with  
> all modules, or explicitly turn on the LevelSetsv4 one (which is  
> part of the Segmentation group).
>
> Please keep the conversation on the mailing list, other users may  
> have the same problem.
>
> Best,
> Arnaud
>
>
> On 09/30/2011 09:06 AM, Hui Tang wrote:
>>
>> Dear Arnaud,
>>
>> Thanks for your help.  I still can not find  
>> itkBinaryImageToWhitakerSparseLevelSetAdaptor.h in v4.0b1.
>> git shows the version number, so it should be right.....
>> Best,
>>
>> Hui
>> On Thu, Sep 29, 2011 at 7:05 PM, Hui Tang <tanghui.seu at gmail.com>  
>> wrote:
>> Hi arnaud thanks a loooooot for this! I will try, I will let you  
>> know how it works:) best hui
>>
>> Op 29 sep. 2011 18:55 schreef "Gelas, Arnaud Joel Florent" <Arnaud_Gelas at hms.harvard.edu 
>> > het volgende:
>>
>> > Hi Hui Tang,
>> >
>> > I am really happy to see you are interested and are testing the  
>> new level set infrastructure!
>> >
>> > If you get this error, I can only assume that you are now using  
>> the git master version of ITK, this file has been remove recently  
>> from the repository...
>> > I would strongly recommend to stick to ITK tags, since API keeps  
>> on changing all around the place in the toolkit.
>> >
>> > Here is how you'd get the last tagged version:
>> >
>> > $ git fetch --all
>> > $ git checkout -t origin/v4.0b1
>> >
>> > With this version, you should be able to find  
>> itkBinaryImageToWhitakerSparseLevelSetAdaptor.h
>> >
>> > If you are more adventurous, and want to be part of the  
>> development, you can use master, but expect API / files / class  
>> name to change.
>> > You can also create a gerrit account to review patches  
>> (instructions are on the wiki). Note that all contributions /  
>> inputs on this effort are welcome!!
>> >
>> > Now regarding your question, this is really easy to make it  
>> happened in the v4 infrastructure. You have two possibilities:
>> >
>> > 1- grab the code from iternal or external term (depending on your  
>> case); copy the code; you modify and remove the part in which the  
>> mean gets updated.
>> > and you add itkSetMacro to set the mean at the beginning.
>> >
>> > 2- you inherit, might need to change some method to virtual (if  
>> needed, let me know that'd be easy to fix).
>> >
>> > If you need more details on how to proceed for 1 or 2, just let  
>> me know, we can definitively give you some more details on how to  
>> proceed.
>> >
>> > Thanks,
>> >
>> > Best,
>> > Arnaud
>> >
>> > ________________________________________
>> > From: Hui Tang [tanghui.seu at gmail.com]
>> > Sent: Thursday, September 29, 2011 12:20 PM
>> > To: Gelas, Arnaud Joel Florent
>> > Subject: Questions about ITK4
>> >
>> > Dear Arnaud,
>> >
>> > How are you?
>> > I am using ITK4, but this headfile  
>> "itkBinaryImageToWhitakerSparseLevelSetAdaptor.h" can not be found  
>> in ITK4. Did I do anything wrong?
>> > And maybe you could help me with another question:) in chanvase  
>> model, if my I would like to have a fixed average intensity ("c1")  
>> for the foreground how can I implement that using ITK4?
>> >
>> > Thanks so much.
>> >
>> > Looking forward to your reply.
>> >
>> > Best,
>> >
>> > Hui Tang
>>
>
>

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