ITK/Tutorials/DOs and DONTs: Difference between revisions

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* Do call Update() before using the pipeline output
* Do call Update() before using the pipeline output
* Do call UpdateLatgesdtPossibleRegion() when reusing a reader.
  <PRE>
        When reusing a reader you must call:
            reader->UpdateLargestPossibleRegion()
        instead of the usual:
            reader->Update()
        Otherwise the extent of the previous image is kept, and in some cases lead to Exceptions
        being thrown if the second image is smaller than the first one.
  </pre>


= Filter-Specific =
= Filter-Specific =

Revision as of 05:07, 11 October 2009

PipeLine

DO

  • Do call Update() before using the pipeline output
  • Do call UpdateLatgesdtPossibleRegion() when reusing a reader.
        When reusing a reader you must call:
             reader->UpdateLargestPossibleRegion()
        instead of the usual:
             reader->Update()
        Otherwise the extent of the previous image is kept, and in some cases lead to Exceptions 
        being thrown if the second image is smaller than the first one.
   

Filter-Specific

itkConnectedComponentsImageFilter

DO NOT

  • Do not assume InputImage->SetRequestedRegion(smallregion) will make the filter faster! The filter will run on the entire InputImage regardless.

DO

  • To make it run on a smaller block:
    • get a new itkRegionOfInterestImageFilter, say ROIfilter
    • ROIfilter->SetInput(InputImage);
    • ROIfilter->SetRegionOfInterest(smallregion);
    • CCfilter->SetInput (ROIfilter->GetOutput());

Image Creation

DO

  • On a newly-manually-created image, do initialize the pixel values if you expect them to be so!
    • Example: image->FillBuffer(0); // initialize it to all dark
    • ITK doesn't initialize the image buffer when you call Allocate(). It is your responsibility to initialize the pixel values.

Coding Style

DO NOT

  • Do not declare constants using
    • #define CONST_VALUE_NAME 3
    • Use instead
      • const unsigned int CONST_VALUE_NAME = 3,
  • ITK doesn't define constants with #defines in header files