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<html>
<head>
<title>
IMAGE_EDGE - Edge Detection in Images
</title>
</head>
<body bgcolor="#eeeeee" link="#cc0000" alink="#ff3300" vlink="#000055">
<h1 align = "center">
IMAGE_EDGE <br> Edge Detection in Images
</h1>
<hr>
<p>
<b>IMAGE_EDGE</b>
is a FORTRAN90 library which
demonstrates the detection of edges in an image.
</p>
<p>
NEWS is a particularly simple edge detection scheme, which compares
the North, East, West, and South neighbors of a pixel to determine
if the pixel lies along an edge.
</p>
<p>
There are many sophisticated edge detection algorithms, and MATLAB
has many of them built into its image processing toolbox. The purpose
of these examples is simply to demonstrate how a simple version of
such edge detection schemes works.
</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_EDGE</b> is available in
<a href = "../../c_src/image_edge/image_edge.html">a C version<a> and
<a href = "../../cpp_src/image_edge/image_edge.html">a C++ version<a> and
<a href = "../../f77_src/image_edge/image_edge.html">a FORTRAN77 version<a> and
<a href = "../../f_src/image_edge/image_edge.html">a FORTRAN90 version<a> and
<a href = "../../m_src/image_edge/image_edge.html">a MATLAB version<a>.
</p>
<h3 align = "center">
Related Data and Programs:
</h3>
<p>
<a href = "../../f_src/image_components/image_components.html">
IMAGE_COMPONENTS</a>,
a FORTRAN90 library which
seeks the connected "nonzero" or "nonblack" components of an image or integer vector,
array or 3D block.
</p>
<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/pbma_io/pbma_io.html">
PBMA_IO<a>,
a FORTRAN90 library which
handles the ASCII Portable Bit Map (PBM) format.
</p>
<p>
<a href = "../../f_src/pgma_io/pgma_io.html">
PGMA_IO<a>,
a FORTRAN90 library which
handles the ASCII Portable Gray Map (PGM) format.
</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>
<li>
Barry Wilkinson, Michael Allen,<br>
Parallel Programming: Techniques and Applications using Networked
Workstations and Parallel Computers,<br>
Pearson/Prentice Hall, 2005,<br>
ISBN: 0-13-140563-2,<br>
LC: QA76.642.W54.
</li>
</ol>
</p>
<h3 align = "center">
Source Code:
</h3>
<p>
<ul>
<li>
<a href = "image_edge.f90">image_edge.f90</a>, the source code.
</li>
<li>
<a href = "image_edge.sh">image_edge.sh</a>,
commands to compile the source code.
</li>
</ul>
</p>
<h3 align = "center">
Examples and Tests:
</h3>
<p>
<ul>
<li>
<a href = "image_edge_prb.f90">image_edge_prb.f90</a>,
a sample calling program.
</li>
<li>
<a href = "image_edge_prb.sh">image_edge_prb.sh</a>,
commands to compile and run the sample program.
</li>
<li>
<a href = "image_edge_prb_output.txt">image_edge_prb_output.txt</a>,
the output file.
</li>
</ul>
</p>
<p>
COINS is a picture of coins.
<ul>
<li>
<a href = "coins.ascii.pgm">coins.ascii.pgm</a>,
an ASCII PGM file containing a grayscale image of coins.
</li>
<li>
<a href = "coins.png">coins.png</a>,
a PNG version of the image.
</li>
<li>
<a href = "coin_edges.ascii.pbm">coin_edges.ascii.pbm</a>,
an ASCII PBM file containing a bitmap image of coins.
</li>
<li>
<a href = "coin_edges.png">coin_edges.png</a>,
a PNG version of the image.
</li>
</ul>
</p>
<p>
PEPPER is a picture of peppers.
<ul>
<li>
<a href = "pepper.ascii.pgm">pepper.ascii.pgm</a>,
an ASCII PGM file containing a grayscale image of coins.
</li>
<li>
<a href = "pepper.png">pepper.png</a>,
a PNG version of the image.
</li>
<li>
<a href = "pepper_edges.ascii.pbm">pepper_edges.ascii.pbm</a>,
an ASCII PBM file containing a bitmap image of coins.
</li>
<li>
<a href = "pepper_edges.png">pepper_edges.png</a>,
a PNG version of the image.
</li>
</ul>
</p>
<h3 align = "center">
List of Routines:
</h3>
<p>
<ul>
<li>
<b>CH_CAP</b> capitalizes a single character.
</li>
<li>
<b>GET_UNIT</b> returns a free FORTRAN unit number.
</li>
<li>
<b>GETINT</b> reads an integer from a file.
</li>
<li>
<b>I4MAT_HISTOGRAM</b> computes a histogram of the elements of an I4MAT.
</li>
<li>
<b>NEWS</b> demonstrates the NEWS stencil for edge detection.
</li>
<li>
<b>PBMA_WRITE</b> writes an ASCII portable bit map file.
</li>
<li>
<b>PBMA_WRITE_DATA</b> writes the data of a PBMA file.
</li>
<li>
<b>PBMA_WRITE_HEADER</b> writes the header of a PBMA file.
</li>
<li>
<b>PGMA_READ_DATA</b> reads the data in an ASCII PGM file.
</li>
<li>
<b>PGMA_READ_HEADER</b> reads the header of an ASCII PGM file.
</li>
<li>
<b>S_EQI</b> is a case insensitive comparison of two strings for equality.
</li>
<li>
<b>S_TO_I4</b> reads an I4 from a string.
</li>
<li>
<b>TIMESTAMP</b> prints the current YMDHMS date as a time stamp.
</li>
<li>
<b>WORD_NEXT_RD</b> "reads" words from a string, one at a time.
</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 modified on 26 December 2010.
</i>
<!-- John Burkardt -->
</body>
</html>