Multispectral image sharpening using wavelet transform techniques and spatial correlation of edges
By: George P. Lemeshewsky and Robert A. Schowengerdt
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Abstract
Several reported image fusion or sharpening techniques are based on the discrete wavelet transform (DWT). The technique described here uses a pixel-based maximum selection rule to combine respective transform coefficients of lower spatial resolution near-infrared (NIR) and higher spatial resolution panchromatic (pan) imagery to produce a sharpened NIR image. Sharpening assumes a radiometric correlation between the spectral band images. However, there can be poor correlation, including edge contrast reversals (e.g., at soil-vegetation boundaries), between the fused images and, consequently, degraded performance. To improve sharpening, a local area-based correlation technique originally reported for edge comparison with image pyramid fusion is modified for application with the DWT process. Further improvements are obtained by using redundant, shift-invariant implementation of the DWT. Example images demonstrate the improvements in NIR image sharpening with higher resolution pan imagery.
Suggested Citation
Lemeshewsky, G.P., and Schowengerdt, R.A., 2000, Multispectral image sharpening using wavelet transform techniques and spatial correlation of edges, in Proceedings of SPIE - The International Society for Optical Engineering, v. 4049, Orlando, FL, USA, 24 April 2000 through 26 April 2000, p. 522-531.
| Publication type | Conference Paper |
|---|---|
| Publication Subtype | Conference Paper |
| Title | Multispectral image sharpening using wavelet transform techniques and spatial correlation of edges |
| Volume | 4049 |
| Year Published | 2000 |
| Language | English |
| Publisher | Society of Photo-Optical Instrumentation Engineers |
| Publisher location | Bellingham, WA, United States |
| Larger Work Title | Proceedings of SPIE - The International Society for Optical Engineering |
| First page | 522 |
| Last page | 531 |
| Conference Title | Algorithms for Multispectral, Hyperspectral, and Ultraspectral Imagery VI |
| Conference Location | Orlando, FL, USA |
| Conference Date | 24 April 2000 through 26 April 2000 |