[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Octave-bug-tracker] [bug #41480] image package :normxcorr2 yields diffe
|
From: |
anonymous |
|
Subject: |
[Octave-bug-tracker] [bug #41480] image package :normxcorr2 yields different result from matlab |
|
Date: |
Thu, 06 Feb 2014 15:59:13 +0000 |
|
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:26.0) Gecko/20100101 Firefox/26.0 Iceweasel/26.0 |
Follow-up Comment #2, bug #41480 (project octave):
Originally, I thought, that xcorr2 was wrong, because it calculates (upcoming
abuse of mathematical notation) <ab> and not (<ab> - <a><b>) as I expected.
However, as Matlab does the same, it turns out I was mistaken. (So you
actually understood me correctly and I was wrong then.)
normxcorr2 in Matlab calculates
(<ab> - <a><b>) / sqrt( (<a^2> - <a>^2)(<b^2> - <b>^2) ).
xcorr2(.,.,"coeff") in Octave currently calculates
<ab> / sqrt( <a^2><b^2> ).
(Again, mind the abuse of notation.)
_______________________________________________________
Reply to this item at:
<http://savannah.gnu.org/bugs/?41480>
_______________________________________________
Nachricht gesendet von/durch Savannah
http://savannah.gnu.org/