www.emgu.com/wiki
The width of the image ( number of pixels in the x direction),
if ROI is set, the width of the ROI

Declaration Syntax
public override int Width { get; }
Public Overrides ReadOnly Property Width As Integer
public:
virtual property int Width {
int get () override;
}
Assembly:
Emgu.CV (Module: Emgu.CV) Version: 1.3.0.0 (1.3.0.0)