0 means basic descriptors (64 elements each), 1 means extended descriptors (128 elements each)

Namespace: Emgu.CV
Assembly: Emgu.CV (in Emgu.CV.dll) Version: 2.0.1.0 (2.0.1.0)

Syntax

C#
public int extended

Visual Basic (Declaration)
Public extended As Integer

Visual C++
public: int extended

See Also