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Proceedings Paper

Automatic image registration through the segmentation of images pre-processed by joint histogram analysis
Author(s): Hernâni Gonçalves; José A. Gonçalves; Luís Corte-Real
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Paper Abstract

A wide variety of automatic image registration methods have been proposed in the last years. However, under the scope of remote sensing applications, geometric correction is still mostly a manual work. A methodology for automatic image registration is proposed, which consists in three major steps: pre-processing, segmentation, and registration. The considered pre-processing is a new method, which is an iterative process based on a joint histogram analysis. Regarding the segmentation stage, global thresholding and a new method were used. The later comprises global thresholding and distance transforms in a single method. For both methods the following object properties were extracted: area, major and minor axis lengths of the adjusted ellipse and perimeter. The registration phase incorporates the matching of corresponding objects, a template matching technique to compute the distance between each pair of matched objects, and the computation of the transformation function parameters. The used dataset consisted in the pairs ETM+/ASTER, ETM+/SPOT and Orthophoto/IKONOS. The proposed methodology allows for the registration of a pair of images with translation and rotation effects, and to some extent with different spectral content, leading to a subpixel accuracy. Furthermore, it has been shown that the proposed pre-processing method allowed for the achievement of suitable segmented objects for later matching, even using global thresholding.

Paper Details

Date Published: 28 September 2009
PDF: 11 pages
Proc. SPIE 7477, Image and Signal Processing for Remote Sensing XV, 74770R (28 September 2009); doi: 10.1117/12.829958
Show Author Affiliations
Hernâni Gonçalves, Univ. do Porto (Portugal)
José A. Gonçalves, Univ. do Porto (Portugal)
Luís Corte-Real, Univ. do Porto (Portugal)
INESC Porto (Portugal)

Published in SPIE Proceedings Vol. 7477:
Image and Signal Processing for Remote Sensing XV
Lorenzo Bruzzone; Claudia Notarnicola; Francesco Posa, Editor(s)

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