Image fusion using IHS color transforms

Image fusion using IHS color transforms - Tutorial

Perform an image fusion of a low-resolution RGB-image and a high-resolution panchromatic image. This process is a typical application for imagery of satellite sensors with low-resolution multispectral bands and a higher resolution panchromatic band like QuickBird, IKONOS, OrbView3, SPOT, Landsat 7, or IRS-1C.

Screenshot:

Preliminaries:

Download and unzip input data: image_fusion_data.zip (compressed, ~5.1MB).

Download and install the package IHS Color Transforms.

Proceeding:

Open pan.tif:
File > Open... pan.tif

Open rgb.tif:
File > Open... rgb.tif

Select rgb.tif and scale it to the size of the panchromatic image:
Image > Scale...
X Scale: 4
Y Scale: 4
...
☑ Interpolate
☐ Fill with Background Color
☑ Create New Window

Select rgb.tif and transform it from RGB to HSI:
Plugins > IHSColorTransforms > IHS_from_RGB

Split HSI-channels:
Image > Color > RGB Split

Close the intensity channel ( rgb-1.tif (red) ):
File > Close

Merge HSI-channels using the panchromatic image as intensity channel:
Image > Color > RGB Merge...
Red: pan.tif
Green: rgb-1.tif (green)
Blue: rgb-1.tif (blue)

Perform the back-transformation from HSI to RGB:
Plugins > IHSColorTransforms > IHS_to_RGB

Image fusion using IHS color transforms - Tutorial Perform an image fusion of a low-resolution RGB-image and a high-resolution panchromatic image. This process is a typical application for imagery of satellite sensors with low-resolution multispectral bands and a higher resolution panchromatic band like QuickBird, IKONOS, OrbView3, SPOT, Landsat 7, or IRS-1C.
Screenshot:
Preliminaries:	Download and unzip input data: image_fusion_data.zip (compressed, ~5.1MB). Download and install the package IHS Color Transforms.
Proceeding:	Open pan.tif: `File > Open... pan.tif` Open rgb.tif: `File > Open... rgb.tif` Select rgb.tif and scale it to the size of the panchromatic image: `Image > Scale...` `X Scale: 4` `Y Scale: 4` `...` ☑ `Interpolate` ☐ `Fill with Background Color` ☑ `Create New Window` Select rgb.tif and transform it from RGB to HSI: `Plugins > IHSColorTransforms > IHS_from_RGB` Split HSI-channels: `Image > Color > RGB Split` Close the intensity channel ( rgb-1.tif (red) ): `File > Close` Merge HSI-channels using the panchromatic image as intensity channel: `Image > Color > RGB Merge...` `Red: pan.tif` `Green: rgb-1.tif (green)` `Blue: rgb-1.tif (blue)` Perform the back-transformation from HSI to RGB: `Plugins > IHSColorTransforms > IHS_to_RGB`