| Titre | Subpixel-matching based on phase correlation applied to stereo-radargrammetry |
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| Auteur | Zakharov, I; Toutin, T |
| Source | 32nd Canadian Symposium on Remote Sensing and 14th Congress of the Association québecoise de télédétection: monitoring a changing world, program/32e Symposium canadien sur la télédétection et 14e Congrès
de l'Association québecoise de télédétection : suivi d'un monde en mutation; 2011 p. 58  Accès
ouvert |
| Liens | Online - En ligne (complete volume - volume complet, 7z, 3.96
MB)
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| Image |  |
| Année | 2011 |
| Séries alt. | Secteur des sciences de la Terre, Contribution externe 20110140 |
| Réunion | 32nd Canadian Symposium on Remote Sensing and 14th Congress of the Association québecoise de télédétection; Sherbrooke, QC; CA; juin 13-16, 2011 |
| Document | livre |
| Lang. | anglais |
| Media | papier; en ligne; numérique |
| Référence reliée | Cette publication est reliée à Subpixel image
matching based on Fourier phase correlation for Radarsat-2 stereo-radargrammetry |
| Formats | pdf |
| Sujets | télédétection; méthodes radar; Méthodologie; géophysique; Sciences et technologie |
| Programme | Cartographie topographique |
| Diffusé | 2011 06 01 |
| Résumé | (disponible en anglais seulement)
The purpose of the stereo-radargrammetric process consists in the extraction of spatial information from stereo synthetic aperture radar (SAR) images. The
accuracy of this process depends on the values of parallax, which is the subject of the stereo pair configuration, and the accuracy in determining parallax. The goal of this work is to evaluate the effect of subpixel image matching in determining
parallax for stereo-radargrammetry. To determine parallax a subpixel matching algorithm based on the phase correlation method was developed. This method calculates image cross-correlation in the Fourier domain. Upsampling a discrete Fourier transform
achieves subpixel accuracy in cross-correlation peak localization without increased computational cost. A hierarchical multi-resolution approach allows the usage of a windowing algorithm to determine parallax for every image pixel. The developed
algorithm was applied to Radarsat-2 data of Fine Quad (FQ) mode (5.2 x 7.6m resolution). First, we simulated a set of SAR images corresponding to various Radarsat-2 beams between FQ5 (25°) and FQ18 (38°). The experimental results with simulated
images show that a decrease in intersection angle leads to an increase in matching accuracy up to 1/20 of a pixel. Second, the algorithm was applied for matching the real stereo pair FQ5 and FQ18. To validate the matching results a digital surface
model was extracted and compared with accurate lidar data. The analysis of the mutual dependence of matching accuracy and stereo pair configurations shows that the application of sub-pixel matching allows us to make the radargrammetric process
flexible in the choice of stereo pairs. |
| GEOSCAN ID | 289112 |
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