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

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Edited by: Z.-U. RahmanR.A. Schowengerdt, and S.E. Reichenbach

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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.
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
Larger Work Title Proceedings of SPIE - The International Society for Optical Engineering
First page 189
Last page 200
Conference Title Visual Information Processing XI
Conference Location Orlando, FL
Conference Date 4 April 2002 through 4 April 2002
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