vtk image procesing
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VTKSonu mangal
Prepared by,
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VTK• VTK stands for Visualization tool kit•Act or process of interpreting in visual terms or of putting into visual form.• in other words, transformation of data or information into picture.•Example : Weather forecasting maps
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VTK Process
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How to create VTK file?various ways to create VTK file like C++, Java, Python and so on. Import header file or standard library file and simple use them.
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Create cone file using VTK Step 1: Header filefirst include the required header files for the vtk classes we are using like for cone,#include "vtkConeSource.h"#include "vtkPolyDataMapper.h“#include "vtkActor.h"#include "vtkRenderer.h"#include "vtkRenderWindow.h“
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Create cone file using VTK Step 2: SourceIn our case, source is a cone.Next we create an instance of vtkConeSource and set some of its properties.Is a source process object means with no input.Part of visualization pipeline.Only produces data of output type is vtkpolydata. Which other filter may process.
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Create cone file using VTK > Source
Step 2: Source// create instance of conevtkConeSource *cone = vtkConeSource::New();
// set properties cone->SetHeight( 3.0 ); cone->SetRadius( 1.0 ); cone->SetResolution( 10 );
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Create cone file using VTK Step : filterProcess with both input and output.Filter will be process object with at least one input and one output (intermediate data store will not be represented)
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Create cone file using VTK Step : intermediate filter
Output of source should be behave as input for mapper by using these filter.
Source
mapper
Intermediate filter
(Vtk shrink polydata filter)
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Create cone file using VTK Step 3: mapperNow we create an instance of mapper to map the polygonal data into graphics primitives. declared in vtkploydatamapper.h header file. also known as sink.Process that consume data with no output.Because these process map data to a final image or output.
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Create cone file using VTK>mapper
Step 3: mapper// create instance of mappervtkPolyDataMapper *coneMapper = vtkPolyDataMapper::New();
// output of source into mapper coneMapper->SetInputConnection( cone->GetOutputPort() );
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PipelineConsist of object to represent,•Data object•Process Object•Arrow connection object
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Pipeline topologyElement of pipeline: Source, filter and mapper to create visualization pipeline or network
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Pipeline issueMostly 2 important issue that arises when we use pipeline1. Type2. Multiplicity
Type :means the form or type of data that process
object take as input or generate output.For ex: Sphere, cone
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Pipeline issueMultiplicityIs used to read a data file and manipulate
them and to also show them.For ex: stream file
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Create cone file using VTKStep 4: actorPreviously, we create source and set properties and then map them now, we represent the cone.Actor rendering of the mapper's graphics primitives. An actor also refers to properties via a vtkProperty instance, and includes an internal transformation matrix.We set this actor's mapper to be coneMapper which we created previous.
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Create cone file using VTK>actorStep 4: actor// set mapper graphics into actor for representvtkActor *coneActor = vtkActor::New(); coneActor->SetMapper( coneMapper );
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Create cone file using VTKStep 5: renderingRender is the process to convert data as input and converted into graphics or pictorial representation.A renderer is like a viewport.It is part or all of a window on the screen and it is responsible for drawing the actors it has. also set the background color here.
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Create cone file using VTK>render
Step 5: rendering
// create render objectvtkRenderer *ren1= vtkRenderer::New();// add render with actor ren1->AddActor( coneActor );// set background ren1->SetBackground( 0.1, 0.2, 0.4 );
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Create cone file using VTKStep 6: rendering window Now, finally show output in screen
by using renderwindow.h header file .
we put our renderer into the render window using AddRenderer.
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Create cone file using VTK>render window
Step 6: rendering window
// create renderwindow objectvtkRenderWindow *renWin = vtkRenderWindow::New(); // add renderwindow with render renWin->AddRenderer( ren1 );
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Create cone file usingStep 7: deleteNow we free OS memory or to release resource by using delete() function. cone->Delete(); coneMapper->Delete(); coneActor->Delete(); ren1->Delete(); renWin->Delete();
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ResultWhen we configure and generate .cxx file then we get following result like,
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Thank you
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