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<h1>DataRepresentation/Image/VectorImage.cxx</h1><div class="fragment"><pre class="fragment"><span class="comment">/*=========================================================================</span>
<span class="comment"></span>
<span class="comment"> Program: Insight Segmentation & Registration Toolkit</span>
<span class="comment"> Module: $RCSfile: VectorImage.cxx,v $</span>
<span class="comment"> Language: C++</span>
<span class="comment"> Date: $Date: 2005-02-08 03:51:53 $</span>
<span class="comment"> Version: $Revision: 1.12 $</span>
<span class="comment"></span>
<span class="comment"> Copyright (c) Insight Software Consortium. All rights reserved.</span>
<span class="comment"> See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.</span>
<span class="comment"></span>
<span class="comment"> This software is distributed WITHOUT ANY WARRANTY; without even </span>
<span class="comment"> the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR </span>
<span class="comment"> PURPOSE. See the above copyright notices for more information.</span>
<span class="comment"></span>
<span class="comment">=========================================================================*/</span>
<span class="preprocessor">#if defined(_MSC_VER)</span>
<span class="preprocessor"></span><span class="preprocessor">#pragma warning ( disable : 4786 )</span>
<span class="preprocessor"></span><span class="preprocessor">#endif</span>
<span class="preprocessor"></span>
<span class="comment">// Software Guide : BeginLatex</span>
<span class="comment">//</span>
<span class="comment">// Many image processing tasks require images of non-scalar pixel type. A</span>
<span class="comment">// typical example is an image of vectors. This is the image type required to</span>
<span class="comment">// represent the gradient of a scalar image. The following code illustrates</span>
<span class="comment">// how to instantiate and use an image whose pixels are of vector type.</span>
<span class="comment">//</span>
<span class="comment">// For convenience we use the \doxygen{Vector} class to define the pixel</span>
<span class="comment">// type. The Vector class is intended to represent a geometrical vector in</span>
<span class="comment">// space. It is not intended to be used as an array container like the</span>
<span class="comment">// \href{http://www.sgi.com/tech/stl/Vector.html}{\code{std::vector}} in</span>
<span class="comment">// \href{http://www.sgi.com/tech/stl/}{STL}. If you are interested in</span>
<span class="comment">// containers, the \doxygen{VectorContainer} class may provide the</span>
<span class="comment">// functionality you want.</span>
<span class="comment">//</span>
<span class="comment">// \index{itk::Vector}</span>
<span class="comment">// \index{itk::Vector!header}</span>
<span class="comment">//</span>
<span class="comment">//</span>
<span class="comment">// The first step is to include the header file of the Vector class.</span>
<span class="comment">//</span>
<span class="comment">// Software Guide : EndLatex </span>
<span class="comment">// Software Guide : BeginCodeSnippet</span>
<span class="preprocessor">#include "<a class="code" href="itkVector_8h.html">itkVector.h</a>"</span>
<span class="comment">// Software Guide : EndCodeSnippet</span>
<span class="preprocessor">#include "<a class="code" href="itkImage_8h.html">itkImage.h</a>"</span>
<span class="keywordtype">int</span> <a name="a0"></a><a class="code" href="itkTestMain_8h.html#dacbe0175a79dff748855d8c9839f82b">main</a>(<span class="keywordtype">int</span>, <span class="keywordtype">char</span> *[])
{
<span class="comment">// Software Guide : BeginLatex</span>
<span class="comment">// </span>
<span class="comment">// The Vector class is templated over the type used to represent</span>
<span class="comment">// the coordinate in space and over the dimension of the space. In this example,</span>
<span class="comment">// we want the vector dimension to match the image dimension, but this is by</span>
<span class="comment">// no means a requirement. We could have defined a four-dimensional image</span>
<span class="comment">// with three-dimensional vectors as pixels.</span>
<span class="comment">//</span>
<span class="comment">// \index{itk::Vector!Instantiation}</span>
<span class="comment">// \index{itk::Vector!itk::Image}</span>
<span class="comment">// \index{itk::Image!Vector pixel}</span>
<span class="comment">//</span>
<span class="comment">// Software Guide : EndLatex </span>
<span class="comment">// Software Guide : BeginCodeSnippet</span>
<span class="keyword">typedef</span> <a name="_a1"></a><a class="code" href="classitk_1_1Vector.html" title="A templated class holding a n-Dimensional vector.">itk::Vector< float, 3 ></a> PixelType;
<span class="keyword">typedef</span> <a name="_a2"></a><a class="code" href="classitk_1_1Image.html" title="Templated n-dimensional image class.">itk::Image< PixelType, 3 ></a> ImageType;
<span class="comment">// Software Guide : EndCodeSnippet</span>
<span class="comment">// Then the image object can be created</span>
<a name="a3"></a><a class="code" href="itkFEMMacro_8h.html#539cce1a3282ba59952dedcbf9cdb23f">ImageType::Pointer</a> image = <a name="a4"></a><a class="code" href="namespaceHardConnectedComponentImageFilter.html#870262f145e0b45206db74df8053b59c">ImageType::New</a>();
<span class="comment">// The image region should be initialized</span>
<a name="a5"></a><a class="code" href="namespaceHardConnectedComponentImageFilter.html#be32dc19e71d40322ad9828b9ab40853">ImageType::IndexType</a> start;
<a name="a6"></a><a class="code" href="namespaceHardConnectedComponentImageFilter.html#5bf82236e1e50e653de84c8ead448599">ImageType::SizeType</a> size;
size[0] = 200; <span class="comment">// size along X</span>
size[1] = 200; <span class="comment">// size along Y</span>
size[2] = 200; <span class="comment">// size along Z</span>
start[0] = 0; <span class="comment">// first index on X</span>
start[1] = 0; <span class="comment">// first index on Y</span>
start[2] = 0; <span class="comment">// first index on Z</span>
<a name="a7"></a><a class="code" href="namespaceHardConnectedComponentImageFilter.html#ed8c4a40607d317c666eb96ea265e126">ImageType::RegionType</a> region;
region.SetSize( size );
region.SetIndex( start );
<span class="comment">// Pixel data is allocated</span>
image->SetRegions( region );
image->Allocate();
<span class="comment">// The image buffer is initialized to a particular value</span>
ImageType::PixelType initialValue;
<span class="comment">// A vector can initialize all its components to the</span>
<span class="comment">// same value by using the Fill() method.</span>
initialValue.Fill( 0.0 );
<span class="comment">// Now the image buffer can be initialized with this</span>
<span class="comment">// vector value.</span>
image->FillBuffer( initialValue );
<a class="code" href="namespaceHardConnectedComponentImageFilter.html#be32dc19e71d40322ad9828b9ab40853">ImageType::IndexType</a> pixelIndex;
pixelIndex[0] = 27; <span class="comment">// x position</span>
pixelIndex[1] = 29; <span class="comment">// y position</span>
pixelIndex[2] = 37; <span class="comment">// z position</span>
<span class="comment">// Software Guide : BeginLatex</span>
<span class="comment">//</span>
<span class="comment">// The Vector class inherits the operator \code{[]} from the</span>
<span class="comment">// \doxygen{FixedArray} class. This makes it possible to access the</span>
<span class="comment">// Vector's components using index notation.</span>
<span class="comment">//</span>
<span class="comment">// Software Guide : EndLatex </span>
<span class="comment">// Software Guide : BeginCodeSnippet</span>
ImageType::PixelType pixelValue;
pixelValue[0] = 1.345; <span class="comment">// x component</span>
pixelValue[1] = 6.841; <span class="comment">// y component</span>
pixelValue[2] = 3.295; <span class="comment">// x component</span>
<span class="comment">// Software Guide : EndCodeSnippet</span>
<span class="comment">// Software Guide : BeginLatex</span>
<span class="comment">//</span>
<span class="comment">// We can now store this vector in one of the image pixels by defining an</span>
<span class="comment">// index and invoking the \code{SetPixel()} method.</span>
<span class="comment">//</span>
<span class="comment">// Software Guide : EndLatex </span>
<span class="comment">// Software Guide : BeginCodeSnippet</span>
image->SetPixel( pixelIndex, pixelValue );
<span class="comment">// Software Guide : EndCodeSnippet</span>
<span class="comment">// The GetPixel method can also be used to read Vectors </span>
<span class="comment">// pixels from the image</span>
ImageType::PixelType value = image->GetPixel( pixelIndex );
<span class="comment">// Lets repeat that both \code{SetPixel()} and \code{GetPixel()} are</span>
<span class="comment">// inefficient and should only be used for debugging purposes or for</span>
<span class="comment">// implementing interactions with a graphical user interface such as</span>
<span class="comment">// querying pixel value by clicking with the mouse.</span>
<span class="keywordflow">return</span> 0;
}
</pre></div> </div>
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