filtering data by the bounding box size

[Sergiy Fefilatyev]

Hi,

I spent quite a lot of time trying to figure out how to filter ground-
truth data and results of detection by the size of the bounding box. I
needed to filter out targets with the bounding boxes that have height
or width <12 pixels. As far as I understand the type of data of
"data:bbox" does not accept filters like ">=" or ">". Is that a
correct conclusion?

My second attempt used specifically introduced node "<attribute
name="WIDTH>" with data values of type "data:fvalue" which,
theoretically should accept those filters.

my filter section is the following:

#BEGIN_GROUND_FILTER
OBJECT SHIP
WIDTH : >= 12
#END_GROUND_FILTER

Howver, I get the following error:
java.lang.NullPointerException
at viper.descriptors.attributes.Attribute_fvalue
$FloatValue.compareTo(Un
known Source)
at viper.filters.Rules$Comparison.passes(Unknown Source)
at viper.descriptors.attributes.Attribute.passes(Unknown
Source)
at viper.filters.RuleHolder.meetsCriteria(Unknown Source)
at viper.descriptors.DescVector.parseData(Unknown Source)
at viper.descriptors.DescHolder.parseData(Unknown Source)
at viper.descriptors.DescHolder.parseData(Unknown Source)
at viper.comparison.ViperPE.parseDescriptorData(Unknown
Source)
at viper.comparison.ViperPE.run(Unknown Source)
at viper.comparison.ViperPE.main(Unknown Source)

I use the following config of schema:
<descriptor name="SHIP" type="OBJECT">
<attribute dynamic="false" name="name" type="http://
lamp.cfar.umd.edu/viperdata#svalue"/>
<attribute dynamic="true" name="Location" type="http://
lamp.cfar.umd.edu/viperdata#bbox"/>
<attribute dynamic="true" name="WIDTH" type="http://
lamp.cfar.umd.edu/viperdata#fvalue">
<default>
<data:fvalue value="0.0"/>
</default>
</attribute>
<attribute dynamic="true" name="HEIGHT" type="http://
lamp.cfar.umd.edu/viperdata#fvalue">
<default>
<data:fvalue value="0.0"/>
</default>
</attribute>
</descriptor>

the data looks as following:
<object framespan="1:35 58:100" id="0" name="SHIP">
<attribute name="name">
<data:svalue value="0"/>
</attribute>
<attribute name="Location">
<data:bbox framespan="1:1" height="28" width="26"
x="288" y="169"/>
<data:bbox framespan="2:2" height="47" width="28"
x="243" y="161"/>
....
</attribute>
<attribute name="WIDTH">
<data:fvalue framespan="1:1" value="26"/>
<data:fvalue framespan="2:2" value="28"/>
.....
</attribute>
<attribute name="HEIGHT">
<data:fvalue framespan="1:1" value="28"/>
<data:fvalue framespan="2:2" value="47"/>
.....
</attribute>

Please tell me what I did wrong

[David Mihalcik]

It looks like there is a bug in the rule code that does not load
default values. To work around it, you can make
sure the value is set in the xml file, or maybe edit the code. I think
the error is Attribute.java's definition of
'passes(Filterable.Rule)'. Actually, it looks like *nothing* respects
the default value - once it is set, eclipse's
'call hierarchy' reports that nothing uses it.

David Mihalcik

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[Sergiy Fefilatyev]

David,

thank you for your reply. I decided to avoid the problem by filtering data in my own program.

--
with kind regards,
Sergiy