[Insight-users] Spatial Objects and the SpatialObjectToImageFilter
Julien Jomier
jjomier at cs.unc.edu
Mon May 2 18:15:20 EDT 2005
Dominique,
The itkLineSpatialObject is actually a polyline so it's defined by a set
of points and not only the two end points. You need to do a loop to fill
in the gap between the two end points manually.
Julien
Dominique Belhachemi wrote:
> Hi Julien,
>
> now i can see the endpoints of the line.
> This is good, but the line between the endpoints are still black.
>
> Thx Dominique
>
>
>
> ----- Original Message ----- From: "Julien Jomier" <jjomier at cs.unc.edu>
> To: "Dominique Belhachemi" <domibel at cs.tu-berlin.de>
> Cc: <insight-users at itk.org>
> Sent: Monday, May 02, 2005 11:49 PM
> Subject: Re: [Insight-users] Spatial Objects and the
> SpatialObjectToImageFilter
>
>
>> Hi Dominique,
>>
>> I think the problem comes from the internal Bounding Box computation.
>>
>> Can you try to add the following line:
>>
>> line1->ComputeBoundingBox();
>>
>> after
>> line1->SetPoints(pointlist);
>>
>> I'll fix the SpatialObject to recompute the bounding box when the list
>> of points is set.
>>
>> Let us know if that fixes the problem,
>>
>> Julien
>>
>> Dominique Belhachemi wrote:
>>
>>> Hi Julien,
>>>
>>> i still have the same problem. I am not able to produce an Image of a
>>> LineSpatialObject.....
>>>
>>> Please have a look at my example-source. It should write a
>>> LineSpatialObject and a EllipseSpatialObject to disk in a jpg-file
>>> "2D-Line.jpg".
>>> But i can see only the Ellipse. Where is the failure?
>>>
>>> Dominique
>>>
>>>
>>> ----- Original Message ----- From: "Julien Jomier" <jjomier at cs.unc.edu>
>>> To: "Dominique Belhachemi" <domibel at cs.tu-berlin.de>
>>> Cc: <insight-users at itk.org>
>>> Sent: Monday, May 02, 2005 5:37 AM
>>> Subject: Re: [Insight-users] Spatial Objects and the
>>> SpatialObjectToImageFilter
>>>
>>>
>>>> Hi Dominique,
>>>>
>>>> The IsInside() function is not implemented for the
>>>> ArrowSpatialObject so the SpatialObjectToImageFilter cannot be used
>>>> with this object.
>>>>
>>>> However, for Line, Surface and BlobSpatialObject the
>>>> SpatialObjectToImageFilter should work. As you probably know these
>>>> objects are composed of points (each point having at least a
>>>> location plus other parameters). The SpatialObjectToImageFilter will
>>>> set a bright pixel if at least one point lies inside a pixel.
>>>>
>>>> My guess is that you are not creating the
>>>> Line/Surface/BlobSpatialObject correctly. You can look at the
>>>> SoftwareGuide (chapter 5) for more information on how to create
>>>> these objects.
>>>>
>>>> Let us know if you have further problems,
>>>>
>>>> Julien
>>>>
>>>> Dominique Belhachemi wrote:
>>>>
>>>>> Hello,
>>>>>
>>>>> after creating a SpatialObject i can produce an Image of this
>>>>> SpatialObject with the SpatialObjectToImageFilter.
>>>>>
>>>>> This process works fine in the case of CylinderSpatialObject or
>>>>> EllipseSpatialObjects for example.
>>>>>
>>>>> But this process produces for a few SpatialObjects like
>>>>> - ArrowSpatialObject
>>>>> - LineSpatialObject
>>>>> - SurfaceSpatialObject
>>>>> - BlobSpatialObject
>>>>> only Images with grayvalue zero. (This means the pictures are black)
>>>>>
>>>>>
>>>>> Is this volitional ?
>>>>> How can i solve this problem?
>>>>>
>>>>>
>>>>> Dominique
>>>>> _______________________________________________
>>>>> Insight-users mailing list
>>>>> Insight-users at itk.org
>>>>> http://www.itk.org/mailman/listinfo/insight-users
>>>>
>>>>
>>>>
>>>
>>> #include "itkImage.h"
>>> #include "itkImageFileWriter.h"
>>> #include "itkGroupSpatialObject.h"
>>> #include "itkLineSpatialObject.h"
>>> #include "itkEllipseSpatialObject.h"
>>> #include "itkLineSpatialObjectPoint.h"
>>> #include "itkSpatialObjectToImageFilter.h"
>>> #include "itkRescaleIntensityImageFilter.h"
>>>
>>>
>>> int main( int argc, char *argv[] )
>>> {
>>> const int Dimension = 2;
>>> typedef itk::GroupSpatialObject< Dimension > GroupType;
>>> typedef itk::EllipseSpatialObject< Dimension > EllipseType;
>>> typedef itk::LineSpatialObject< Dimension > LineType;
>>> typedef itk::LineSpatialObjectPoint< Dimension > LinePointType;
>>> typedef itk::CovariantVector<double, Dimension > VectorType;
>>>
>>> typedef itk::Image< double, Dimension > ImageType;
>>> typedef itk::Image< unsigned char, Dimension > OutputImageType;
>>> typedef itk::ImageFileWriter< OutputImageType > WriterType;
>>> typedef itk::RescaleIntensityImageFilter< ImageType,
>>> OutputImageType > CastFilterType;
>>> typedef itk::SpatialObjectToImageFilter< GroupType, ImageType >
>>> SpatialObjectToImageFilterType;
>>>
>>>
>>> GroupType::Pointer group = GroupType::New();
>>>
>>> EllipseType::Pointer ellipse1 = EllipseType::New();
>>> LineType::Pointer line1 = LineType::New();
>>>
>>> group->AddSpatialObject(ellipse1); // visualisation works
>>> group->AddSpatialObject(line1); // visualisation doesnt works
>>>
>>> EllipseType::ArrayType radius;
>>> radius[0] = 5;
>>> radius[1] = 10;
>>> ellipse1->SetRadius(radius);
>>>
>>> LineType::PointListType pointlist; //STL std::vector<
>>> LinePointType >
>>>
>>> LinePointType p;
>>> VectorType normal;
>>>
>>> normal[0] = 1;
>>> normal[1] = 6;
>>> p.SetNormal(normal,0);
>>> p.SetPosition(10,10);
>>> p.SetColor(1, 0, 0, 1);
>>> pointlist.push_back(p);
>>>
>>> normal[0] = 13;
>>> normal[1] = 3;
>>> p.SetNormal(normal,0);
>>> p.SetPosition(20,20);
>>> p.SetColor(1, 1, 0, 1);
>>> pointlist.push_back(p);
>>>
>>> normal[0] = 12;
>>> normal[1] = 4;
>>> p.SetNormal(normal,0);
>>> p.SetPosition(100,100);
>>> p.SetColor(1, 0, 0, 1);
>>> pointlist.push_back(p);
>>>
>>> normal[0] = 4;
>>> normal[1] = 1;
>>> p.SetNormal(normal,0);
>>> p.SetPosition(20,200);
>>> p.SetColor(1, 0, 0, 1);
>>> pointlist.push_back(p);
>>>
>>> line1->SetPoints(pointlist);
>>> LineType::PointListType::const_iterator it =
>>> line1->GetPoints().begin(); while(it != line1->GetPoints().end())
>>> {
>>> std::cout << "Position = " << (*it).GetPosition() << std::endl;
>>> std::cout << "Color = " << (*it).GetColor() << std::endl;
>>> std::cout << "First normal = " << (*it).GetNormal(0) <<
>>> std::endl;
>>> std::cout << std::endl;
>>> it++;
>>> }
>>>
>>> EllipseType::TransformType::OffsetType offset;
>>> offset[0] = 40.0;
>>> offset[1] = 40.0;
>>> ellipse1->GetObjectToParentTransform()->SetOffset(offset);
>>> ellipse1->ComputeObjectToWorldTransform();
>>>
>>> SpatialObjectToImageFilterType::Pointer imageFilter =
>>> SpatialObjectToImageFilterType::New();
>>> imageFilter->SetInput( group );
>>> ImageType::SizeType size;
>>> size[ 0 ] = 128;
>>> size[ 1 ] = 128;
>>> imageFilter->SetSize( size );
>>> imageFilter->Update();
>>>
>>> CastFilterType::Pointer castFilter = CastFilterType::New();
>>> castFilter->SetOutputMinimum( 0 );
>>> castFilter->SetOutputMaximum( 255 );
>>> castFilter->SetInput( imageFilter->GetOutput() );
>>>
>>> WriterType::Pointer writer = WriterType::New();
>>> writer->SetFileName( "2D-Line.jpg" );
>>> writer->SetInput( castFilter->GetOutput() );
>>> try {
>>> writer->Update(); }
>>> catch( itk::ExceptionObject & err ) {
>>> std::cout << "ExceptionObject caught !" << std::endl;
>>> std::cout << err << std::endl; return -1;
>>> }
>>>
>>> return 0;
>>> }
>>>
>>>
>>> ------------------------------------------------------------------------
>>>
>>> _______________________________________________
>>> Insight-users mailing list
>>> Insight-users at itk.org
>>> http://www.itk.org/mailman/listinfo/insight-users
>>
>>
>>
>
>
>
>
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