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Diffstat (limited to 'ds9/doc/ref/how.html')
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diff --git a/ds9/doc/ref/how.html b/ds9/doc/ref/how.html index f7f2ccc..5176b98 100644 --- a/ds9/doc/ref/how.html +++ b/ds9/doc/ref/how.html @@ -97,17 +97,18 @@ colors based on the frequency of each data value.</p> <p><b><a name="Smoothing"></a>Smoothing</b></p> <p>The user may select one of three types of smoothing kernels. - The parameter, <i>r</i> or <tt>kernel radius</tt>, is defined - as the following:</p> - <blockquote> Boxcar function, where the width = 2<i>r</i>+1<br> - Tophat function, where the radius = <i>r</i> and the diameter - of kernel is 2<i>r</i>+1<br> + Two parameters, <i>r</i><i> (radius)</i> and <i><tt>k </tt></i><i>(kernel + size</i><i>)</i>, are defined as the following:</p> + <blockquote> Kernel width/height = <i>2k+1</i> with <i>r</i><i> + <= </i><i><tt>k</tt></i><br> + Boxcar function, width = <i>2</i><i>r</i><i>+1</i><br> + Tophat function, where the diameter = <i>2r</i><i>+1</i><br> Gaussian function, defined as: <blockquote><img src="img/gauss.png" alt="Gaussian Equation" width="173" height="38"><br> </blockquote> - where the mean = 0 and sigma =<i> r</i>/2, and the diameter of - kernel is 2<i>r</i>+1 </blockquote> + where the mean = 0 and sigma =<i> r/2</i><br> + </blockquote> <p><b><a name="Contours"></a>Contours</b></p> <p>The contour algorithm is from an unknown author and originally came from FV. The difference between the two modes are:<tt><br> |