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ITK Lecture 6 - The Pipeline Methods in Image Analysis CMU Robotics Institute 16-725 U. Pitt Bioengineering 2630 Spring Term, 2006

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What’s a pipeline? You may recall that ITK is organized around data objects and process objects You should now be somewhat familiar with the primary data object, itk::Image Today we’ll talk about how to do cool things to images, using process objects

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The pipeline idea

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Image sources

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Image to image filters

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Input and output ImageSource’s do not require input, so they have only a GetOutput() function ImageToImageFilter’s have both SetInput() and GetOutput() functions

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Ignoring intermediate images

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How this looks in code SrcType::Pointer src = SrcType::New(); FilAType::Pointer filterA = FilAType::New(); FilBType::Pointer filterB = FilBType::New(); src->SetupTheSource(); filterA->SetInput( src->GetOutput() ); filterB->SetInput( filterA->GetOutput() ); ImageType::Pointer im = filterB->GetOutput();

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When execution occurs The previous page of code only sets up the pipeline - i.e., what connects to what This does not cause the pipeline to execute In order to “run” the pipeline, you must call Update() on the last filter in the pipeline

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Propagation of Update() When Update() is called on a filter, the update propagates back “up” the pipeline until it reaches a process object that does not need to be updated, or the start of the pipeline

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When are process objects updated? If the input to the process object has changed If the process object itself has been modified - e.g., I change the radius of a Gaussian blur filter

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Detecting process object modification The easy way is to use itkSetMacro(MemberName, type); which produces the function void SetMemberName(type); that calls Modified() for you when a new value is set in the class. For example: itkSetMacro(DistanceMin, double); sets member variable m_DistanceMin

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Process object modification, cont. The other way is to call Modified() from within a process object function when you know something has changed this->Modified(); You can call Modified() from outside the class as well, to force an update Using the macros is a better idea though...

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Running the pipeline - Step 1

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Running the pipeline - Step 2

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Running the pipeline - Step 3

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Running the pipeline - Step 4

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Modifying the pipeline - Step 1

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Modifying the pipeline - Step 2

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Modifying the pipeline - Step 3

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Thoughts on pipeline modification Note that in the previous example the source never re-executed; it had no input and it was never modified, so the output cannot have changed This is good! We can change things at the end of the pipeline without wasting time recomputing things at the beginning

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It’s easy in practice Build a pipeline Call Update() on the last filter - get the output Tweak some of the filters Call Update() on the last filter - get the output ...ad nauseam

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Reading & writing You will often begin and end pipelines with readers and writers Fortunately, ITK knows how to read a wide variety of image types!

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Reading and writing images Use itk::ImageFileReader to read images Use itk::ImageFileWriter to write images Both classes have a SetImageIO(ImageIOBase*) function used to specify a particular type of image to read or write

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Reading an image (4.1.2) Create a reader Create an instance of an ImageIOBase derived class (e.g. PNGImageIO) Pass the IO object to the reader Set the file name of the reader Update the reader

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Reader notes The ImageType template parameter is the type of image you want to convert the stored image to, not necessarily the type of image stored in the file ITK assumes a valid conversion exists between the stored pixel type and the target pixel type

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Writing an image Almost identical to the reader case, but you use an ImageFileWriter instead of a reader If you’ve already created an IO object during the read stage, you can recycle it for use with the writer

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More read/write notes ITK actually has several different ways of reading files - what I’ve presented is the simplest conceptually Other methods exist to let you read files without knowing their format

Теги Lecture Pipeline

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