[vtkusers] an odd question about a plate which behind the actor

[Jothybasu K Selvaraj]

As David Gobbi said, you can use vtkConnectivityFilter to extract the
largest portion of your data.

http://www.vtk.org/doc/release/4.0/html/classvtkConnectivityFilter.html#_details

Jothy

On Fri, Apr 2, 2010 at 5:05 AM, 朱文武 <cool.wenwu at gmail.com> wrote:

> David,
>     thanks firstly!  I began to know something about the use of the
> vtkConnectivityFilter. However, the current problem is that i can not find
> any line or other pot in the original image in that place. ( you can see the
> image in the email which i reply to jothy. ), I do not know how the plate
> occurred !  Could you provide more details?
>
> Ｔｈａｎｋｓ，
> Ｗｅｎｗｕ
>
>
>
> On Thu, Apr 1, 2010 at 10:36 PM, David Gobbi <david.gobbi at gmail.com>wrote:
>
>> The vtkConnectivityFilter can remove unwanted geometry like that plate.
>>
>>    David
>>
>>
>>
>> On Thu, Apr 1, 2010 at 8:29 AM, Jothybasu K Selvaraj <jothybasu at gmail.com
>> > wrote:
>>
>>> What I think is that the plate/thin slab appearing should be due to
>>> having similar scalar value as the brain. Verify your dicom images using a
>>> dicom viewer first and ensure that no plate are there in the original
>>> image.In most of the medical images there appears patient rest uesd while
>>> scanning.
>>>
>>> Jothy
>>>
>>> On Thu, Apr 1, 2010 at 3:13 PM, 朱文武 <cool.wenwu at gmail.com> wrote:
>>>
>>>>
>>>> Dear all and David,
>>>>      Thanks!   Firstly, I like to say sorry to david, it's my careless
>>>> and mistake !   Now， i present my problem again ！ thanks for all any help !
>>>>
>>>> i also do not know why the image was disappeared.   I don't know whether
>>>> the problem is related to the code. Because the same code can applied in
>>>> other images(dataset), and the problem did not occurred. The related code
>>>> was presented:
>>>>
>>>>    m_read = new vtkBMPReader();
>>>>    skinExtractor = vtkMarchingCubes::New();//
>>>>    skinNormals = vtkPolyDataNormals::New();//
>>>>     triangle=vtkTriangleFilter::New();//
>>>>     deci=vtkDecimatePro::New();/
>>>>     smoother=vtkSmoothPolyDataFilter::New();//
>>>>     skinMapper = vtkPolyDataMapper::New();//
>>>>     skin = vtkActor::New();
>>>>
>>>>     this->m_read->Update();//read the bmp image
>>>>     this->skinExtractor->SetInputConnection(m_read->GetOutputPort());
>>>>     this->skinExtractor->SetValue(0,threshshold);
>>>>
>>>> this->skinNormals->SetInputConnection(skinExtractor->GetOutputPort());/
>>>>     this->skinNormals->SetFeatureAngle(60.0);//
>>>>     this->triangle->SetInputConnection(skinNormals->GetOutputPort());//
>>>>     this->deci->SetInputConnection(triangle->GetOutputPort());//
>>>>     this->deci->SetTargetReduction(predigestion);//
>>>>     this->deci->PreserveTopologyOn();//
>>>>     this->smoother->SetInputConnection(deci->GetOutputPort());//
>>>>     this->smoother->SetNumberOfIterations(smoothness);//
>>>>     this->skinMapper->SetInputConnection(smoother->GetOutputPort());//
>>>>     this->skinMapper->ScalarVisibilityOff();//
>>>>     this->skinMapper->SetColorModeToMapScalars();
>>>>     this->skinMapper->SetScalarRange(-1,1);
>>>>
>>>>
>>>>     // Link the actor
>>>>
>>>>     this->skin->SetMapper(this->skinMapper);
>>>>     this->skin->GetProperty()->SetColor(0.94,0.83,0.45);
>>>>
>>>>
>>>> The image of the result:
>>>>
>>>> [image: 5.bmp]
>>>>
>>>> Thanks,
>>>> WenWu
>>>>
>>>>
>>>> On Wed, Mar 31, 2010 at 9:33 AM, David Doria <daviddoria+vtk at gmail.com<daviddoria%2Bvtk at gmail.com>
>>>> > wrote:
>>>>
>>>>> On Tue, Mar 30, 2010 at 9:08 PM, 朱文武 <cool.wenwu at gmail.com> wrote:
>>>>>
>>>>>>
>>>>>> Why no people help me ? Is this question too easy?
>>>>>> I'm waiting!
>>>>>>
>>>>>
>>>>> I didn't see an attached image that you said you sent. Also, please
>>>>> post the smallest compilable code that demonstrates your problem.
>>>>>
>>>>> Thanks,
>>>>>
>>>>> David
>>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
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>>
>
>
> --
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> 工作愉快，身体健康！
>
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