ITK
6.0.0
Insight Toolkit
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#include <itkExtractImageFilter.h>
Decrease the image size by cropping the image to the selected region bounds.
ExtractImageFilter changes the image boundary of an image by removing pixels outside the target region. The target region must be specified.
ExtractImageFilter also collapses dimensions so that the input image may have more dimensions than the output image (i.e. 4-D input image to a 3-D output image). To specify what dimensions to collapse, the ExtractionRegion must be specified. For any dimension dim where ExtractionRegion.Size[dim] = 0, that dimension is collapsed. The index to collapse on is specified by ExtractionRegion.Index[dim]. For example, we have a image 4D = a 4x4x4x4 image, and we want to get a 3D image, 3D = a 4x4x4 image, specified as [x,y,z,2] from 4D (i.e. the 3rd "time" slice from 4D). The ExtractionRegion.Size = [4,4,4,0] and ExtractionRegion.Index = [0,0,0,2].
The number of dimension in ExtractionRegion.Size and Index must = InputImageDimension. The number of non-zero dimensions in ExtractionRegion.Size must = OutputImageDimension.
The output image produced by this filter will have the same origin as the input image, while the ImageRegion of the output image will start at the starting index value provided in the ExtractRegion parameter. If you are looking for a filter that will re-compute the origin of the output image, and provide an output image region whose index is set to zeros, then you may want to use the RegionOfInterestImageFilter. The output spacing is simply the collapsed version of the input spacing.
Determining the direction of the collapsed output image from an larger dimensional input space is an ill defined problem in general. It is required that the application developer select the desired transformation strategy for collapsing direction cosines. It is REQUIRED that a strategy be explicitly requested (i.e. there is no working default). Direction Collapsing Strategies: 1) DirectionCollapseToUnknown(); This is the default and the filter can not run when this is set. The reason is to explicitly force the application developer to define their desired behavior. 1) DirectionCollapseToIdentity(); Output has identity direction no matter what 2) DirectionCollapseToSubmatrix(); Output direction is the sub-matrix if it is positive definite, else throw an exception.
This filter is implemented as a multithreaded filter. It provides a DynamicThreadedGenerateData() method for its implementation.
Definition at line 119 of file itkExtractImageFilter.h.
Static Public Member Functions | |
static Pointer | New () |
Static Public Member Functions inherited from itk::ImageToImageFilter< TInputImage, TOutputImage > | |
static double | GetGlobalDefaultCoordinateTolerance () |
static double | GetGlobalDefaultDirectionTolerance () |
static void | SetGlobalDefaultCoordinateTolerance (double) |
static void | SetGlobalDefaultDirectionTolerance (double) |
Static Public Member Functions inherited from itk::Object | |
static bool | GetGlobalWarningDisplay () |
static void | GlobalWarningDisplayOff () |
static void | GlobalWarningDisplayOn () |
static Pointer | New () |
static void | SetGlobalWarningDisplay (bool val) |
Static Public Member Functions inherited from itk::LightObject | |
static void | BreakOnError () |
static Pointer | New () |
Static Public Attributes | |
static constexpr unsigned int | InputImageDimension = TInputImage::ImageDimension |
static constexpr unsigned int | OutputImageDimension = TOutputImage::ImageDimension |
Static Public Attributes inherited from itk::InPlaceImageFilter< TInputImage, TOutputImage > | |
static constexpr unsigned int | InputImageDimension |
static constexpr unsigned int | OutputImageDimension |
Static Public Attributes inherited from itk::ImageToImageFilter< TInputImage, TOutputImage > | |
static constexpr unsigned int | InputImageDimension = TInputImage::ImageDimension |
static constexpr unsigned int | OutputImageDimension = TOutputImage::ImageDimension |
Static Public Attributes inherited from itk::ImageSource< TOutputImage > | |
static constexpr unsigned int | OutputImageDimension = TOutputImage::ImageDimension |
Protected Attributes | |
InputImageRegionType | m_ExtractionRegion {} |
OutputImageRegionType | m_OutputImageRegion {} |
Protected Attributes inherited from itk::ImageSource< TOutputImage > | |
bool | m_DynamicMultiThreading { true } |
Protected Attributes inherited from itk::ProcessObject | |
TimeStamp | m_OutputInformationMTime {} |
bool | m_Updating {} |
Protected Attributes inherited from itk::LightObject | |
std::atomic< int > | m_ReferenceCount {} |
Private Attributes | |
DirectionCollapseStrategyEnum | m_DirectionCollapseStrategy { DirectionCollapseStrategyEnum::DIRECTIONCOLLAPSETOUNKOWN } |
Additional Inherited Members | |
Protected Types inherited from itk::ImageToImageFilter< TInputImage, TOutputImage > | |
using | InputToOutputRegionCopierType = ImageToImageFilterDetail::ImageRegionCopier< Self::OutputImageDimension, Self::InputImageDimension > |
using | OutputToInputRegionCopierType = ImageToImageFilterDetail::ImageRegionCopier< Self::InputImageDimension, Self::OutputImageDimension > |
Static Protected Member Functions inherited from itk::ImageSource< TOutputImage > | |
static const ImageRegionSplitterBase * | GetGlobalDefaultSplitter () |
static ITK_THREAD_RETURN_FUNCTION_CALL_CONVENTION | ThreaderCallback (void *arg) |
Static Protected Member Functions inherited from itk::ProcessObject | |
template<typename TSourceObject > | |
static void | MakeRequiredOutputs (TSourceObject &sourceObject, const DataObjectPointerArraySizeType numberOfRequiredOutputs) |
static constexpr float | progressFixedToFloat (uint32_t fixed) |
static uint32_t | progressFloatToFixed (float f) |
using itk::ExtractImageFilter< TInputImage, TOutputImage >::ConstPointer = SmartPointer<const Self> |
Definition at line 128 of file itkExtractImageFilter.h.
using itk::ExtractImageFilter< TInputImage, TOutputImage >::DirectionCollapseStrategyEnum = ExtractImageFilterEnums::DirectionCollapseStrategy |
Definition at line 154 of file itkExtractImageFilter.h.
using itk::ExtractImageFilter< TInputImage, TOutputImage >::ExtractImageFilterRegionCopierType = ImageToImageFilterDetail::ExtractImageFilterRegionCopier<Self::InputImageDimension, Self::OutputImageDimension> |
Definition at line 253 of file itkExtractImageFilter.h.
using itk::ExtractImageFilter< TInputImage, TOutputImage >::InputImageIndexType = typename TInputImage::IndexType |
Definition at line 150 of file itkExtractImageFilter.h.
using itk::ExtractImageFilter< TInputImage, TOutputImage >::InputImagePixelType = typename TInputImage::PixelType |
Definition at line 146 of file itkExtractImageFilter.h.
using itk::ExtractImageFilter< TInputImage, TOutputImage >::InputImageRegionType = typename TInputImage::RegionType |
Definition at line 142 of file itkExtractImageFilter.h.
using itk::ExtractImageFilter< TInputImage, TOutputImage >::InputImageSizeType = typename TInputImage::SizeType |
Definition at line 152 of file itkExtractImageFilter.h.
using itk::ExtractImageFilter< TInputImage, TOutputImage >::InputImageType = TInputImage |
Image type information.
Definition at line 137 of file itkExtractImageFilter.h.
using itk::ExtractImageFilter< TInputImage, TOutputImage >::OutputImageIndexType = typename TOutputImage::IndexType |
Typedef to describe the output and input image index and size types.
Definition at line 149 of file itkExtractImageFilter.h.
using itk::ExtractImageFilter< TInputImage, TOutputImage >::OutputImagePixelType = typename TOutputImage::PixelType |
Typedef to describe the type of pixel.
Definition at line 145 of file itkExtractImageFilter.h.
using itk::ExtractImageFilter< TInputImage, TOutputImage >::OutputImageRegionType = typename TOutputImage::RegionType |
Typedef to describe the output and input image region types.
Definition at line 141 of file itkExtractImageFilter.h.
using itk::ExtractImageFilter< TInputImage, TOutputImage >::OutputImageSizeType = typename TOutputImage::SizeType |
Definition at line 151 of file itkExtractImageFilter.h.
using itk::ExtractImageFilter< TInputImage, TOutputImage >::OutputImageType = TOutputImage |
Definition at line 138 of file itkExtractImageFilter.h.
using itk::ExtractImageFilter< TInputImage, TOutputImage >::Pointer = SmartPointer<Self> |
Definition at line 127 of file itkExtractImageFilter.h.
using itk::ExtractImageFilter< TInputImage, TOutputImage >::Self = ExtractImageFilter |
Standard class type aliases.
Definition at line 125 of file itkExtractImageFilter.h.
using itk::ExtractImageFilter< TInputImage, TOutputImage >::Superclass = InPlaceImageFilter<TInputImage, TOutputImage> |
Definition at line 126 of file itkExtractImageFilter.h.
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This function calls the actual region copier to do the mapping from output image space to input image space. It uses a Function object used for dispatching to various routines to copy an output region (start index and size) to an input region. For most filters, this is a trivial copy because most filters require the input dimension to match the output dimension. However, some filters like itk::ExtractImageFilter can support output images of a lower dimension that the input.
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ExtractImageFilter can be implemented as a multithreaded filter. Therefore, this implementation provides a DynamicThreadedGenerateData() routine which is called for each processing thread. The output image data is allocated automatically by the superclass prior to calling DynamicThreadedGenerateData(). DynamicThreadedGenerateData can only write to the portion of the output image specified by the parameter "outputRegionForThread"
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overrideprotectedvirtual |
Overridden to check if there is no work to be done, before calling superclass' implementation.
Reimplemented from itk::ProcessObject.
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overrideprotectedvirtual |
ExtractImageFilter can produce an image which is a different resolution than its input image. As such, ExtractImageFilter needs to provide an implementation for GenerateOutputInformation() in order to inform the pipeline execution model. The original documentation of this method is below.
Reimplemented from itk::ProcessObject.
Reimplemented in itk::CropImageFilter< TInputImage, TOutputImage >.
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NOTE: The SetDirectionCollapseToUknown is explicitly not defined. It is a state that a filter can be in only when it is first instantiate prior to being initialized. Get the currently set strategy for collapsing directions of physical space.
Definition at line 222 of file itkExtractImageFilter.h.
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Set/Get the output image region. If any of the ExtractionRegion.Size = 0 for any particular dimension dim, we have to collapse dimension dim. This means the output image will have 'c' dimensions less than the input image, where c = number of ExtractionRegion.Size = 0.
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Reimplemented from itk::LightObject.
Reimplemented in itk::CropImageFilter< TInputImage, TOutputImage >.
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Method for creation through the object factory.
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overrideprotectedvirtual |
Methods invoked by Print() to print information about the object including superclasses. Typically not called by the user (use Print() instead) but used in the hierarchical print process to combine the output of several classes.
Reimplemented from itk::LightObject.
Reimplemented in itk::CropImageFilter< TInputImage, TOutputImage >.
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Definition at line 229 of file itkExtractImageFilter.h.
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Definition at line 236 of file itkExtractImageFilter.h.
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Backwards compatibility for enum values Set the strategy to be used to collapse physical space dimensions.
itk::itkExtractImageFilter::DIRECTIONCOLLAPSETOIDENTITY Set the strategy so that all collapsed images have an identity direction. Use this strategy when you know that retention of the physical space orientation of the collapsed image is not important.
itk::itkExtractImageFilter::DIRECTIONCOLLAPSETOGUESS Set the strategy so that all collapsed images where output direction is the sub-matrix if it is positive definite, else return identity. This is backwards compatible with ITKv3, but is highly discouraged because the results are difficult to anticipate under differing data scenarios.
itk::itkExtractImageFilter::DIRECTIONCOLLAPSETOSUBMATRIX Set the strategy so that all collapsed images where output direction is the sub-matrix if it is positive definite, else throw an exception. Use this strategy when it is known that properly identified physical space sub-volumes can be reliably extracted from a higher dimensional space. For example when the application programmer knows that a 4D image is 3D+time, and that the 3D sub-space is properly defined.
Definition at line 195 of file itkExtractImageFilter.h.
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Definition at line 243 of file itkExtractImageFilter.h.
void itk::ExtractImageFilter< TInputImage, TOutputImage >::SetExtractionRegion | ( | InputImageRegionType | extractRegion | ) |
Set/Get the output image region. If any of the ExtractionRegion.Size = 0 for any particular dimension dim, we have to collapse dimension dim. This means the output image will have 'c' dimensions less than the input image, where c = number of ExtractionRegion.Size = 0.
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ImageDimension enumeration
Definition at line 250 of file itkExtractImageFilter.h.
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Definition at line 325 of file itkExtractImageFilter.h.
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Definition at line 320 of file itkExtractImageFilter.h.
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Definition at line 322 of file itkExtractImageFilter.h.
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Definition at line 251 of file itkExtractImageFilter.h.