ITK/Tutorials/DOs and DONTs: Difference between revisions
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= PipeLine = | = PipeLine = | ||
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* Do call Update() before using the pipeline output | * Do call Update() before using the pipeline output | ||
= 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 = | = Image Creation = | ||
| Line 19: | Line 28: | ||
== DO NOT == | == DO NOT == | ||
* Do not declare | * Do not declare constants using | ||
** #define CONST_VALUE_NAME 3 | ** #define CONST_VALUE_NAME 3 | ||
** Use instead | ** Use instead | ||
*** const unsigned int CONST_VALUE_NAME = 3, | *** const unsigned int CONST_VALUE_NAME = 3, | ||
* ITK doesn't define constants with #defines in header files | * ITK doesn't define constants with #defines in header files | ||
Revision as of 15:27, 7 July 2009
PipeLine
DO
- Do call Update() before using the pipeline output
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
