help-octave
[Top][All Lists]
Advanced

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Octave 4.0.3: normxcorr2 producing unexpected result


From: oli
Subject: Re: Octave 4.0.3: normxcorr2 producing unexpected result
Date: Wed, 29 Mar 2017 06:58:51 -0700 (PDT)

Thanks Hartmut,

The "expected result" comes from this video taken from the Computer Vision
course on Udacity: https://youtu.be/9hN3MeCavP4?t=79

Any idea what might have produced this result?

> Only the (minor problem) of the border pixels remains, and it is taken
care of in [2].

Great.


On Tue, Mar 28, 2017 at 12:30 PM, Hartmut [via Octave] <
address@hidden> wrote:

> Hey Oli,
>
> the result of Octave's normxcorr2 (when using the previously mentioned
> patch in [1]) is fully Matlab compatible, except for the outer two numbers
> on each side. Where does your "expected result" come from? The values of
> normalized correlation coefficients should stay between -1 and 1.
>
> The remaining issue seems to only concern border pixels, you can follow
> the discussion under [2] if you like.
>
> Regarding the result max that you mentioned: I think this should be only
> due to (inavoidable) numerical inaccuracies. By the way, the Matlab result
> of your max command is the very same as Octave's for your example.
>
> So I can't "feel" a major bug here, any more. Only the (minor problem) of
> the border pixels remains, and it is taken care of in [2].
>
> So, have fun with Octave in your Udacity course. (By the way, your Udacity
> link is login protected, I cannot read it.)
>
>      Hartmut
>
>
> [1] https://savannah.gnu.org/bugs/?50122
> [2] https://savannah.gnu.org/bugs/?50151
>
> ------------------------------
> If you reply to this email, your message will be added to the discussion
> below:
> http://octave.1599824.n4.nabble.com/Octave-4-0-3-normxcorr2-producing-
> unexpected-result-tp4681543p4682651.html
> To unsubscribe from Octave 4.0.3: normxcorr2 producing unexpected result, 
> click
> here
> <http://octave.1599824.n4.nabble.com/template/NamlServlet.jtp?macro=unsubscribe_by_code&node=4681543&code=b2xhbG9uZGVAZ21haWwuY29tfDQ2ODE1NDN8LTYwNjUwMjE=>
> .
> NAML
> <http://octave.1599824.n4.nabble.com/template/NamlServlet.jtp?macro=macro_viewer&id=instant_html%21nabble%3Aemail.naml&base=nabble.naml.namespaces.BasicNamespace-nabble.view.web.template.NabbleNamespace-nabble.view.web.template.NodeNamespace&breadcrumbs=notify_subscribers%21nabble%3Aemail.naml-instant_emails%21nabble%3Aemail.naml-send_instant_email%21nabble%3Aemail.naml>
>



-- 
- Oli

Oli Lalonde
http://www.syskall.com <-- connect with me!




--
View this message in context: 
http://octave.1599824.n4.nabble.com/Octave-4-0-3-normxcorr2-producing-unexpected-result-tp4681543p4682664.html
Sent from the Octave - General mailing list archive at Nabble.com.



reply via email to

[Prev in Thread] Current Thread [Next in Thread]