> There is a bug in the distance measure for points. It isn't
> 'null safe', meaning it will fail instead of giving a distance if no
> point is specified in either the target or candidate data on a frame.
> A work around is making sure you have a value on every frame that is
> in your object, but that might not be doable. (e.g. a face landmark
> point disappears when a person turns their head, but the 'object' is
> the person, not the landmark, so you'd still expect to have a
> descriptor).
> I'd recommend filing a bug with viper-bugs, or you can fix it yourself
> if you download the source code. The bug is in the method on the top
> of your stack trace, in the EuclideanDistance inner class of
> viper.descriptors.attributes.Attribute_point. You'd have to check the
> values of the Difference object for nulls, instead of doing what it
> does now, which is dereference them directly.
> On Feb 29, 7:13 am, avastreg <isac.new...@gmail.com> wrote:
> > Hi, i'm new with ViPER-PE and i'm working on it for my graduating
> > thesis. That's a very good work, but i've got some problems on point
> > type evaluation.
> > I get a NullPointerException at
> > viper.descriptors.attributes.Attribute_point
> > $EuclideanDistance.helpGetDistance(Unknown Source)
> > at viper.comparison.distances.Distances.. etc
> > and then the exception chain until to main.
> > Here there are my test file:
> > target GT:
> > <object framespan="77:94" id="0" name="Person">
> > <attribute name="PositionBar">
> > <data:point framespan="77:77" x="14" y="180"/>
> > <data:point framespan="78:78" x="17" y="187"/>
> > <data:point framespan="79:79" x="18" y="182"/>
> > </attribute>
> > </object>
> > candidate:
> > <object framespan="77:94" id="0" name="Person">
> > <attribute name="PositionBar">
> > <data:point framespan="77:77" x="12" y="176"/>
> > <data:point framespan="78:78" x="17" y="187"/>
> > <data:point framespan="79:79" x="23" y="188"/>
> > </attribute>
> > </object>
> > my epf file:
> > #BEGIN_OBJECT_EVALUATION
> > OBJECT Person [- -]
> > PositionBar : [- 0.1]
> > #END_OBJECT_EVALUATION
> > //#BEGIN_FRAMEWISE_EVALUATION
> > OBJECT Person
> > PositionBar : euclidean
> > //#END_FRAMEWISE_EVALUATION
> > i've tried the object evaluation only and i get the NullPointer.
> > If needed i'll post my pr file.
> > Is it a bug?? Have i do something wrong?
> > Thank you in advice for the help!
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