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<html><head> <title>Verilog HDL: Two-Dimensional FIR Filter</title> <meta name="keywords" content="Verilog HDL, FIR filtering, FIR, two-dimensional FIR filter, 2D filter"> <meta name="description" content="Finite impulse response (FIR) filtering for video applications and image processing is used in many applications, from noise removal, to image sharpening, to feature extraction."> <meta name="date" content="2002-08-26"> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <link rel="stylesheet" type="text/css" href="/js.lib/style.css"> <link rel="stylesheet" type="text/css" href="/js.lib/style_form.css"></head><!--stopindex--><BODY BGCOLOR="#ffffff" marginwidth="0" marginheight="0" rightmargin="0" topmargin="0" leftmargin="0"><!-- Toolbar Header --><table cellSpacing=0 cellPadding=0 width="100%" border=0 nowrap><tr> <td><table width="100%" border="0" cellspacing="0" cellpadding="0" nowrap><tr> <td bgcolor="#0182C4" align="left"><img src="/common/template/altera_left.jpg" width="578" height="60" usemap="#banner_l" border="0" align="left" alt="Altera Homepage"><map name="banner_l"><area shape="rect" coords="9,16,158,55" href="/index.jsp"></map></td><td bgcolor="#0182C4" align="right"><img src="/common/template/altera_right.gif" width="181" height="62" usemap="#altera_right" border="0" alt="Altera Quicklinks"><map name="altera_right"><area shape="rect" coords="5,8,54,54" href="/support/software/sof-download_center.html" alt="Download" title="Download"><area shape="rect" coords="63,11,110,54" href="/support/licensing/lic-index.html" alt="Licensing" title="Licensing"><area shape="rect" coords="122,10,170,56" href="/literature/lit-index.html" alt="Literature" title="Literature"></map></td></tr></table><table width="100%" border="0" cellpadding="0" cellspacing="0"><tr> <td bgcolor="#0182C4" height="2" width="161"> </td><!-- begin top level navigation (top) --><td bgcolor="#000000" height="2" colspan="3"><img src="/common/template/support.gif" width="617" height="19" usemap="#support" border="0" alt="Global Navigation Bar"><map name="support"><area shape="rect" coords="0,0,54,19" href="/index.jsp" alt="Altera Home"><area shape="rect" coords="56,0,127,19" href="/products/prd-index.html" alt="Altera Products"><area shape="rect" coords="130,0,198,19" href="/support/spt-index.html" alt="Altera Support Center"><area shape="rect" coords="200,0,315,19" href="/solutions/sln-index.html" alt="Altera System Solutions"><area shape="rect" coords="318,0,442,19" href="/education/edu-index.html" alt="Altera Education"><area shape="rect" coords="445,0,534,19" href="http://buy.altera.com/ecommerce/index.html" alt="Altera Buy On-Line"><area shape="rect" coords="538,0,608,19" href="/corporate/crp-index.html" alt="Altera Corporate"></map></td><!-- end top level navigation (top) --></tr><tr> <td bgcolor="#e0e0e0" height="2"><img src="/common/template/search.gif" width="161" height="19" alt="Search Here" border="0"></td><!-- begin second level navigation (top) --><td bgcolor="#747474" height="2" colspan="3"><img src="/common/template/support_examples.gif" width="617" height="19" usemap="#support_examples" border="0" alt="Second Level Navigation Bar"><map name="support_examples"><area shape="rect" coords="0,2,87,17" href="http://www.altera.com/mysupport" alt="Altera mySupport"><area shape="rect" coords="92,0,224,18" href="/support/kdb/spt-search_kdb.html" alt="Knowledge Database"><area shape="rect" coords="231,0,305,19" href="/support/software/sof-index.html" alt="Software"><area shape="rect" coords="308,1,381,18" href="/support/devices/dvs-index.html" alt="Altera Devices"><area shape="rect" coords="390,1,524,21" href="/support/examples/exm-index.html" alt="Design Examples"></map></td><!-- end second level navigation (top) --></tr><tr> <td valign="top" bgcolor="#e0e0e0" width="161" height="1%" align="center"> <script language="JavaScript"> document.writeln("<form name='search_altera' method=GET accept-charset='iso-8859-1' action='/cgi-bin/devsearch.pl'>"); 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By applying a low-pass filter or smoothing function the image is flattened, thereby reducing the rapid pixel-to-pixel variation in gray levels and ultimately removing noise. On the other hand, image sharpening focuses on the fine details of the image and enhances sharp transitions between the pixels. This acts as a high-pass filter that reduces broad features in an image, such as the uniform background, and enhances compact features or details that have been blurred.</p>?? 快捷鍵說明
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