Information Technology Reference
In-Depth Information
The MPEG-7 standard defines two forms of description representations.
One is defined in Description Definition Language (DDL) and the other
in binary form. To provide readers with some idea of how features are
represented, the syntaxes of the two representations are presented here for
the first descriptor introduced in this chapter. Others are omitted and can be
found in ISO/IEC information technology [1].
•
DDL Representation Syntax
<complexType name=”DominantColorType” final=”#all”>
<complexContent>
<extension base=”mpeg7:VisualDType”>
<sequence>
<element name=”ColorSpace” type=”mpeg7:ColorSpaceType”
minOccurs=”0”/>
<element name=”ColorQuantization” type=”mpeg7:ColorQua
ntizationType” minOccurs=”0”/>
<element name=”SpatialCoherency”
type=”mpeg7:unsigned5”/>
<element name=”Value” minOccurs=”1” maxOccurs=”8”>
<complexType>
<sequence>
<element name=”Percentage” type=”mpeg7:unsigned5”/>
<element name=”Index”>
<simpleType>
<restriction>
<simpleType>
<list itemType=”mpeg7:unsigned12”/>
</simpleType>
<length value=”3”/>
</restriction>
</simpleType>
</element>
<element name=”ColorVariance” minOccurs=”0”>
<simpleType>
<restriction>
<simpleType>
<list itemType=”mpeg7:unsigned1”/>
</simpleType>
<length value=”3”/>
</restriction>
</simpleType>
</element>
</sequence>
</complexType>
</sequence>
</extension>
</complexContent>
</complexType>
