[Insight-users] Fast Image Conversion-

[Ryan L. Smith]

Thanks for the helpful responses.  I used the vtkImageImport for the fast
real-time display, and only acquired to ITK for my processing requirements.
 Appreciate the advice-
-Ryan

On Tue, Feb 8, 2011 at 9:30 PM, Karthik Krishnan <
karthik.krishnan at kitware.com> wrote:

> Also try importing each of the pieces separately, ie the
> importFilter->Update(), connector->Update(). Its hard to tell where in the
> pipeline you hang now..
>
> Also, I presume you are doing some processing in ITK. If not, you could use
> a vtkImageImport to get this straight into VTK, instead of first converting
> to an ITK image, then to a VTK image.
>
> On Tue, Feb 8, 2011 at 7:54 PM, Ryan L. Smith <ryans09 at gmail.com> wrote:
>
>> Hi David-
>>
>> Thanks for the quick response.  I explored that option, and my software
>> compiles although it hangs on execution.  The example has an input as an
>> array of unsigned chars, as opposed to my vector. Is this the
>> problem?  Additionally, this still uses an itk to vtk connector before
>> display.  I am assuming based on your suggestion, the bulk of my time in the
>> previous solution was spent looping and setting individual pixels as
>> opposed to the itk to vtk filter.  Is this correct? If not, is there a
>> vtk import filter that will take my buffer as an input directly? My
>> non-functioning code hangs when I try to connect my pipeline to an actor,
>> and it is included below:
>>
>>
>> ==================================================================================
>>  setupCamera();
>> getCamInfo(w,h,d) //get width,height,depth from camera
>>  typedef unsigned char PixelType;
>> const unsigned int Dimension = 2;
>> typedef itk::Image<PixelType,Dimension> ImageType;
>> typedef itk::ImageToVTKImageFilter< ImageType > ConnectorType;
>> ConnectorType::Pointer connector = ConnectorType::New();
>> typedef itk::Image< PixelType, Dimension > ImageType;
>> typedef itk::ImportImageFilter< PixelType, Dimension > ImportFilterType;
>> ImportFilterType::Pointer importFilter = ImportFilterType::New();
>>
>> vtkSmartPointer<vtkImageActor> actor =
>> vtkSmartPointer<vtkImageActor>::New();
>>
>> ImportFilterType::SizeType size;
>> size[0] = w;
>> size[1] = h; // size along Y
>>
>> ImportFilterType::IndexType start;
>> start.Fill( 0 );
>>
>> ImportFilterType::RegionType region;
>> region.SetIndex( start );
>> region.SetSize( size );
>> importFilter->SetRegion( region );
>>
>> double origin[ Dimension ];
>> origin[0] = 0.0; // X coordinate
>> origin[1] = 0.0; // Y coordinate
>> importFilter->SetOrigin( origin );
>>
>> double spacing[ Dimension ];
>> spacing[0] = 1.0; // along X direction
>> spacing[1] = 1.0; // along Y direction
>>
>> importFilter->SetSpacing( spacing );
>> const int numberOfPixels = size[0] * size[1];
>>
>> ConnectorType::Pointer connector = ConnectorType::New();
>>
>>
>>
>> UINT32_TYPE SizeInBytes = h*w*3*((depth+7)/8);
>>
>> std::vector<
>> unsigned char> ImageData(SizeInBytes);
>>
>> UINT32_OUT_TYPE pnFrameCount ;
>>
>> Result = UCC_GetBitmap8ImageEx( CamId, &*ImageData.begin(), pnFrameCount ,
>> 6000, NULL ) ;
>>
>> const bool importImageFilterWillOwnTheBuffer = true;
>>
>> importFilter->SetImportPointer( &*ImageData.begin(), numberOfPixels,
>>
>> importImageFilterWillOwnTheBuffer );
>>
>> connector->SetInput(importFilter->GetOutput());
>>
>>  actor->SetInput(connector->GetOutput());  // THIS LINE MAKES MY CODE
>> HANG
>>
>>
>> ====================================================================================
>>
>>
>>
>> Thanks in advance for your help!
>> -Ryan
>>
>>
>>
>> On Tue, Feb 8, 2011 at 1:55 PM, David Doria <daviddoria at gmail.com> wrote:
>>
>>>  On Tue, Feb 8, 2011 at 4:52 PM, Ryan L. Smith <ryans09 at gmail.com>
>>> wrote:
>>> >
>>> > Hi-
>>> > I am reading in an image stream in unsigned char vector format from a
>>> camera in real-time.  I have some code setup to display the image using
>>> VTK/ITK, but the latencies are high.  Is there a method to directly convert
>>> this vector to a VTK image?  I am currently looping through and setting the
>>> image pixels in an ITK image using the following example:
>>> > http://www.vtk.org/Wiki/ITK/Examples/SimpleOperations/SetPixels
>>> > I then connect the pipeline using itk::ImageToVTKImageFilter and
>>> display the image.  I recognize this is an inefficient way of doing things,
>>> but came up blank in looking for an optimized function to do it for me.
>>>  Thanks in advance-
>>> > -Ryan
>>>
>>> Have you seen the ImportImageFilter ?
>>> http://www.itk.org/Wiki/ITK/Examples/IO/ImportImageFilter
>>>
>>> David
>>>
>>
>>
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