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<html>
<head>
<title>
IMAGE_COMPONENTS - Connected Components of an Image or Matrix
</title>
</head>
<body bgcolor="#EEEEEE" link="#CC0000" alink="#FF3300" vlink="#000055">
<h1 align = "center">
IMAGE_COMPONENTS <br> Connected Components of an Image or Matrix
</h1>
<hr>
<p>
<b>IMAGE_COMPONENTS</b>
is a FORTRAN90 library which
seeks to count and label the connected nonzero/nonblack
components in an image or integer vector, matrix or 3D block.
</p>
<h3 align = "center">
Licensing:
</h3>
<p>
The computer code and data files described and made available on this
web page are distributed under
<a href = "../../txt/gnu_lgpl.txt">the GNU LGPL license.</a>
</p>
<h3 align = "center">
Languages:
</h3>
<p>
<b>IMAGE_COMPONENTS</b> is available in
<a href = "../../c_src/image_components/image_components.html">a C version</a> and
<a href = "../../cpp_src/image_components/image_components.html">a C++ version</a> and
<a href = "../../f77_src/image_components/image_components.html">a FORTRAN77 version</a> and
<a href = "../../f_src/image_components/image_components.html">a FORTRAN90 version</a> and
<a href = "../../m_src/image_components/image_components.html">a MATLAB version</a>.
</p>
<h3 align = "center">
Related Data and Programs:
</h3>
<p>
<a href = "../../f_src/image_denoise/image_denoise.html">
IMAGE_DENOISE</a>,
a FORTRAN90 library which
applies simple filtering techniques to remove noise from an image.
</p>
<p>
<a href = "../../f_src/image_edge/image_edge.html">
IMAGE_EDGE</a>,
a FORTRAN90 library which
demonstrates a simple procedure for edge detection in images.
</p>
<p>
<a href = "../../f_src/region/region.html">
REGION</a>,
a FORTRAN90 library which
reads 3D MRI voxel data, and groups the voxels into connected regions;
</p>
<h3 align = "center">
Reference:
</h3>
<p>
<ol>
<li>
Jonas Gomes, Luiz Velho,<br>
Image Processing for Computer Graphics,<br>
Springer, 1997,<br>
ISBN: 0387948546,<br>
LC: T385.G65.
</li>
<li>
William Pratt,<br>
Digital Image Processing,<br>
Second Edition,<br>
Wiley, 1991,<br>
ISBN13: 978-0471857662,<br>
LC: TA1632.P7.
</li>
</ol>
</p>
<h3 align = "center">
Source Code:
</h3>
<p>
<ul>
<li>
<a href = "components.f90">components.f90</a>, the source code.
</li>
<li>
<a href = "components.sh">components.sh</a>,
BASH commands to compile the source code.
</li>
</ul>
</p>
<h3 align = "center">
Examples and Tests:
</h3>
<p>
<ul>
<li>
<a href = "components_prb.f90">components_prb.f90</a>,
a sample calling program.
</li>
<li>
<a href = "components_prb.sh">components_prb.sh</a>,
BASH commands to compile and run the sample program.
</li>
<li>
<a href = "components_prb_output.txt">components_prb_output.txt</a>,
the output file.
</li>
<li>
<a href = "indices.txt">indices.txt</a>,
a file of 3D indices needed for the test of I4BLOCK_COMPONENTS.
</li>
</ul>
</p>
<h3 align = "center">
List of Routines:
</h3>
<p>
<ul>
<li>
<b>FILE_COLUMN_COUNT</b> counts the number of columns in the first line of a file.
</li>
<li>
<b>FILE_ROW_COUNT</b> counts the number of row records in a file.
</li>
<li>
<b>GET_UNIT</b> returns a free FORTRAN unit number.
</li>
<li>
<b>I4BLOCK_COMPONENTS</b> assigns contiguous nonzero pixels to a common component.
</li>
<li>
<b>I4MAT_COMPONENTS</b> assigns contiguous nonzero pixels to a common component.
</li>
<li>
<b>I4MAT_DATA_READ</b> reads data from an I4MAT file.
</li>
<li>
<b>I4MAT_HEADER_READ</b> reads the header from an I4MAT.
</li>
<li>
<b>I4VEC_COMPONENTS</b> assigns contiguous nonzero pixels to a common component.
</li>
<li>
<b>S_TO_I4</b> reads an I4 from a string.
</li>
<li>
<b>S_TO_I4VEC</b> reads an I4VEC from a string.
</li>
<li>
<b>S_WORD_COUNT</b> counts the number of "words" in a string.
</li>
<li>
<b>TIMESTAMP</b> prints the current YMDHMS date as a time stamp.
</li>
</ul>
</p>
<p>
You can go up one level to <a href = "../f_src.html">
the FORTRAN90 source codes</a>.
</p>
<hr>
<i>
Last revised on 27 February 2011.
</i>
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