PRIMEWIN: Processing of Images on Windows

##

## Regional Remote Sensing Centre-Central, NAGPUR

# TRNFORM: Image Transforms

TRNFORM is a module for performing image transforms. It encompasses transformations viz. principal component analysis, RGB to IHS (intensity, hue, saturation), IHS to RGB, Data fusion (multi-resolution data fusion using HIS).

### Principal Component Analysis | Data Fusion(HIS) | RGB to IHS | IHS to RGB |

### Data Fusion (Brovey & Multiplicative) | Tasseled-Cap |

· Principal Component Analysis: It will carry out principal component analysis of the input images. Output file will contain no. of bands equal to no. of components selected by the user. Report file will contain statistical information viz. mean, standard deviation, variance, covariance matrix, eigen values, % variance of each component, eigen vector matrix etc. Following figure shows the procedure for performing Principal component analysis.

Statistical Report file

· Data Fusion (using HIS): This module performs data fusion of coarser spatial resolution multi-spectral image with high spatial resolution panchromatic image using IHS technique. It is assumed that both the datasets are already co-registered with required accuracy. The multi-spectral image is first transformed into intensity, hue and saturation components. Intensity component is then replaced with high-resolution panchromatic image and IHS components are then transformed into RGB.

· RGB to IHS: Following figures depicts sequence of steps for transformation of RGB image into IHS components.

· IHS to RGB: Following figures depicts sequence of steps for transformation of IHS components into RGB image.

· Data Fusion (Brovey & Multiplicative): This module performs data fusion of coarser spatial resolution multi-spectral image with high spatial resolution panchromatic image using Brovey or Multiplicative technique. It is assumed that both the datasets are already co-registered with required accuracy.

· Tasseled-Cap Transformation: This module performs Kauth-thomas transformation, popularly known as Tasseled cap transformation. First it calculates scene-based coefficients based on the input values (captured through Pixel Grabber in Viewer) for Green vegetation, Yellow vegetation, Wet soil and Dry soil. Multiple values can be captured for each of these categories. Using the calculated scene-based coefficients, module will generate three output files pertaining to Brightness, Greenness and Yellowness. Output filenames will be automatically created as shown below. These output files can be scaled to 8-bit output.

brightness_inputfilename.tif

greenness_inputfilename.tif

yellowness_inputfilename.tif

First it is required to generate a file containing DN values pertaining to Green vegetation, Yellow vegetation, Wet soil and Dry soil using the Pixel Grabber utility and save in a filename *.pgb. Use this file as input to Tasseled-cap module.