[Insight-developers] Histogram code
Miller, James V (Research)
millerjv@crd.ge.com
Wed, 26 Mar 2003 08:54:05 -0500
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I have a few questions on the Histogram class:
1. The code for building the histogram is rather involved, here is a snippet
from the HistogramMatchingImageFilter
typename HistogramType::IndexType index;
typename HistogramType::InstanceIdentifier id;
typename HistogramType::MeasurementVectorType measurement;
measurement[0] = value;
index = histogram->GetIndex( measurement ); // Step (a)
id = histogram->GetInstanceIdentifier( index ); // Step (b)
histogram->IncreaseFrequency( id, 1 ); // Step (c)
I read this as:
(a) What is the index of the bin that my measurement falls in?
(b) What is the "identifier" for this bin?
(c) Increase the frequency of said bin
I would think I just want do the following
histogram->InsertMeasurement( measurement ); // or some API like
this
and the histogram code will determine what bin that measurement falls in and
update the frequency. Essentially, once I set up the structure of histogram,
I want to treat it rather abstractly. While the index and identifier API's
provide great power, there are pretty low level it all you want to do is
build a histogram and pull off quantiles.
2. What does the GetMeasurement(id)/GetMeasurementVector method do on a
histogram? Does it return the bin center?
<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office"
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Jim Miller
_____________________________________
Visualization & Computer Vision
GE Research
Bldg. KW, Room C218B
P.O. Box 8, Schenectady NY 12301
millerjv@research.ge.com <mailto:millerjv@research.ge.com>
james.miller@research.ge.com
(518) 387-4005, Dial Comm: 8*833-4005,
Cell: (518) 505-7065, Fax: (518) 387-6981
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<DIV><SPAN class=652271913-26032003><FONT size=2>I have a few questions on the
Histogram class:</FONT></SPAN></DIV>
<DIV><SPAN class=652271913-26032003></SPAN><SPAN
class=652271913-26032003></SPAN><SPAN class=652271913-26032003><FONT
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=652271913-26032003><FONT size=2>1. The code for building the
histogram is rather involved, here is a snippet from the
HistogramMatchingImageFilter</FONT></SPAN></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2> typename
HistogramType::IndexType index;<BR> typename
HistogramType::InstanceIdentifier id;<BR> typename
HistogramType::MeasurementVectorType measurement;<BR>
<BR> measurement[0] =
value;<BR> index = histogram->GetIndex(
measurement );<SPAN class=652271913-26032003> // Step
(a)</SPAN><BR> id =
histogram->GetInstanceIdentifier( index );<SPAN
class=652271913-26032003> // Step
(b)</SPAN><BR> histogram->IncreaseFrequency(
id, 1 );<SPAN
class=652271913-26032003>
// Step (c)</SPAN><BR></FONT></DIV>
<DIV><SPAN class=652271913-26032003><FONT size=2>I read this as:
</FONT></SPAN></DIV>
<DIV><SPAN class=652271913-26032003><FONT size=2>
(a) What is the index of the bin that my measurement falls
in?</FONT></SPAN></DIV>
<DIV><SPAN class=652271913-26032003><FONT size=2>
(b) What is the "identifier" for this bin?</FONT></SPAN></DIV>
<DIV><SPAN class=652271913-26032003><FONT size=2>
(c) Increase the frequency of said bin</FONT></SPAN></DIV>
<DIV><SPAN class=652271913-26032003><FONT size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=652271913-26032003><FONT size=2>I would think I just want do
the following</FONT></SPAN></DIV>
<DIV><SPAN class=652271913-26032003><FONT size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=652271913-26032003> <FONT
size=2> histogram->InsertMeasurement( measurement );
// or some API like this</FONT></SPAN></DIV>
<DIV><SPAN class=652271913-26032003><FONT size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=652271913-26032003><FONT size=2>and the histogram code will
determine what bin that measurement falls in and update the frequency.
Essentially, once I set up the structure of histogram, I want to treat it rather
abstractly. While the index and identifier API's provide great power,
there are pretty low level it all you want to do is build a histogram and pull
off quantiles.</FONT></SPAN></DIV>
<DIV><SPAN class=652271913-26032003><FONT size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=652271913-26032003><FONT size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=652271913-26032003><FONT size=2>2. What does the
GetMeasurement(id)/GetMeasurementVector method do on a histogram? Does it return
the bin center?</FONT></SPAN></DIV>
<DIV class=Section1>
<P class=MsoNormal> <?xml:namespace prefix = o ns =
"urn:schemas-microsoft-com:office:office" /><o:p></o:p></P>
<P style="MARGIN: 0in 0in 0pt"><B><SPAN
style="COLOR: navy; FONT-FAMILY: 'Comic Sans MS'">Jim Miller</SPAN></B>
<BR><B><I><SPAN
style="FONT-SIZE: 10pt; COLOR: red; FONT-FAMILY: Arial">_____________________________________</SPAN></I></B><BR><EM><SPAN
style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: Arial">Visualization &
Computer Vision</SPAN></EM><I><SPAN
style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: Arial"><BR><EM>GE
Research</EM><BR><EM>Bldg. KW, Room C218B</EM><BR><EM>P.O. Box 8, Schenectady NY
12301</EM><BR><BR></SPAN></I><EM><U><SPAN
style="FONT-SIZE: 7.5pt; COLOR: blue"><A
href="mailto:millerjv@research.ge.com">millerjv@research.ge.com</A></SPAN></U></EM></P>
<P style="MARGIN: 0in 0in 0pt"><EM><U><SPAN
style="FONT-SIZE: 7.5pt; COLOR: blue">james.miller@research.ge.com</SPAN></U></EM><BR><I><SPAN
style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: Arial">(518) 387-4005, Dial
Comm: 8*833-4005, </SPAN></I><BR><I><SPAN
style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: Arial">Cell: (518) 505-7065,
Fax: (518) 387-6981</SPAN></I> </P>
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