IPansharpeningFilter.PansharpeningType Property

The current pansharpening type.

[Visual Basic .NET]
Public Property PansharpeningType As esriPansharpeningType

[C#]
public esriPansharpeningType PansharpeningType {get; set;}

[C++]
HRESULT get_PansharpeningType(
  esriPansharpeningType* pSharpeningType
);

[C++]
HRESULT put_PansharpeningType(
  esriPansharpeningType pSharpeningType
);

[C++]

Parameters
pSharpeningType [out, retval]

  pSharpeningType is a parameter of type esriPansharpeningType
pSharpeningType [in]

  pSharpeningType is a parameter of type esriPansharpeningType

Product Availability

Description

Pan-sharpening is a process of transformaing a set of low special resolution multispectral images to high spatial resolution color images, by fusing a co-georegistered high spatial resolution panchromatic image.

ArcGIS 9.2 provides four pan-sharpening methods: Simple, Brovey, IHS, and ERSI pansharpening. These methods are all based on the following general model:

A pixel value of a Pan image is considered a weighted average of Red, Green, Blue, and (optional) Infrared components:

P=R*RW + G*GW + B*BW + I*IW
1=RW + GW + BW + IW

where RW, GW, BW, and IW are weights for Red, Green, Blue, and Infrared components. P, R, G, B, and I (as wll as P', R', G', I') represent the input and output pixel values of the panchromatic, Red, green, blue and Infrared bands respectively.

Brovey method:

        DNF=(P-IW*I)/(RW*R+GW*G+BW*B)
        R'=R*DNF
        G'=G*DNF
        B'=B*DNF
        I'=I*DNF

IHS method:

        RGBToHSI(R, G, B, H, S, INTENSITY)
        INTENSITY=P-I*IW
        HSIToRGB(H, S, INTENSITY, R', G', B')

ESRI method:

        WA (Weighted averate)=R*RW + G*GW + B* BW + + I*IW /(RW+GW+BW+IW)
       ADJ (Adjusted value)=P- WA

       R'=R+ADJ
       G'=G+ADJ
       B'=B+ADJ
       I'=I+ADJ

Mean method:

      R'=0.5 * (R + P)
      G'=0.5 * (G + P)
      B'=0.5 * (B + P) < /P >

See Also

.NET Related Topics