1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
|
<!DOCTYPE doctype PUBLIC "-//w3c//dtd html 4.0 transitional//en">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;
charset=ISO-8859-1">
<meta name="GENERATOR" content="Mozilla/4.78 [en] (X11; U; Linux
2.4.7-10 i686) [Netscape]">
<title>Bin</title>
</head>
<body alink="#ff0000" bgcolor="#ffffff" link="#0000ee" text="#000000"
vlink="#551a8b">
<h3><img alt="" src="../sun.gif" align="middle" height="98"
width="100"> Binning</h3>
<blockquote>
<p>To create an image from a FITS Bin Table, the user needs to
specify a binning factor, binning buffer size, and the binning
function.<br>
</p>
<p>The Binning (or Block) Factor is defined as the following: A
value greater or equal to zero. This value indicates the number
of pixel values that will fall into a particular bin.<br>
</p>
<p>The Bin Buffer Size is overall size of the image generated.
This has no relation to min and max values of the columns used
to create the image. <br>
</p>
<p>The Bin Function is defined as the following: Average - all
pixel values that fall into one pixel bin are averaged. Sum -
all pixel values that fall into one pixel bin are summed.<br>
</p>
<p>Bin to Fit Frame will calculate a bin block factor as a power
of 2 that will allow the entire data space to be displayed in
the current frame. </p>
<p>By default, DS9 will bin about the center of the image. To
determine the center of the image, DS9 will look for the
following keywords in order:</p>
<blockquote> <tt>TDMIN/TDMAX<br>
TLMIN/TLMAX<br>
TALEN<br>
AXLEN</tt> </blockquote>
<p>If no valid keywords are found, DS9 will define the center as
the middle of the possible data space based on the coordinate
data type.</p>
<br>
<p><br>
</p>
<blockquote> </blockquote>
<p><br>
</p>
<br>
</blockquote>
</body>
</html>
|
