Use Color Normalized (Brovey) Sharpening to apply a sharpening technique that uses a mathematical combination of the color image and high resolution data. Each band in the color image is multiplied by a ratio of the high resolution data divided by the sum of the color bands. The function automatically resamples the three color bands to the high-resolution pixel size using one of the techniques you select. The choices are nearest neighbor, bilinear, or cubic convolution. The output RGB images will have the pixel size of the input high-resolution data.
Vrabel, Jim, 1996, Multispectral Imagery Band Sharpening Study, Photogrammetric Engineering & Remote Sensing, Vol. 62, No. 9, pp. 1075-1083.
- From the Toolbox, select Image Sharpening > Color Normalized (Brovey) Sharpening. The Select RGB Input Bands dialog appears.
- Select the three color bands to transform from either an open color image display or from the Layer Manager. Click OK. The High Resolution Input File dialog appears.
- Select the high-resolution input band and perform optional spatial subsetting, then click OK. The Color Normalized Sharpening Parameters dialog appears.
- Select the resampling method from the Resampling drop-down list.
- Select output to File or Memory.
- Click OK. ENVI adds the resulting output to the Layer Manager.