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Multispectral image sharpening using a shift-invariant wavelet transform and adaptive processing of multiresolution edges

By:
Edited by:
Z.-U. Rahman, R.A. Schowengerdt, S.E. Reichenbach
DOI: 10.1117/12.477580

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Abstract

Enhanced false color images from mid-IR, near-IR (NIR), and visible bands of the Landsat thematic mapper (TM) are commonly used for visually interpreting land cover type. Described here is a technique for sharpening or fusion of NIR with higher resolution panchromatic (Pan) that uses a shift-invariant implementation of the discrete wavelet transform (SIDWT) and a reported pixel-based selection rule to combine coefficients. There can be contrast reversals (e.g., at soil-vegetation boundaries between NIR and visible band images) and consequently degraded sharpening and edge artifacts. To improve performance for these conditions, I used a local area-based correlation technique originally reported for comparing image-pyramid-derived edges for the adaptive processing of wavelet-derived edge data. Also, using the redundant data of the SIDWT improves edge data generation. There is additional improvement because sharpened subband imagery is used with the edge-correlation process. A reported technique for sharpening three-band spectral imagery used forward and inverse intensity, hue, and saturation transforms and wavelet-based sharpening of intensity. This technique had limitations with opposite contrast data, and in this study sharpening was applied to single-band multispectral-Pan image pairs. Sharpening used simulated 30-m NIR imagery produced by degrading the spatial resolution of a higher resolution reference. Performance, evaluated by comparison between sharpened and reference image, was improved when sharpened subband data were used with the edge correlation.

Additional Publication Details

Publication type:
Conference Paper
Publication Subtype:
Conference Paper
Title:
Multispectral image sharpening using a shift-invariant wavelet transform and adaptive processing of multiresolution edges
DOI:
10.1117/12.477580
Volume
4736
Year Published:
2002
Language:
English
First page:
189
Last page:
200
Number of Pages:
12
Conference Title:
Visual Information Processing XI
Conference Location:
Orlando, FL
Conference Date:
4 April 2002 through 4 April 2002