Adaptive Weighted Multi-image Shape from Shading for Precise Topographic Reconstruction at the Lunar South Pole
The generation and analysis of fine surface topography are critical for landing site selection at the lunar south pole. The Shape from Shading (SFS) technique can theoretically reconstruct a pixel-level resolution topographic model. However, traditional SFS methods fail to effectively balance fine-d...
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| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2025-01-01
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| Series: | The Astronomical Journal |
| Subjects: | |
| Online Access: | https://doi.org/10.3847/1538-3881/add885 |
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| Summary: | The generation and analysis of fine surface topography are critical for landing site selection at the lunar south pole. The Shape from Shading (SFS) technique can theoretically reconstruct a pixel-level resolution topographic model. However, traditional SFS methods fail to effectively balance fine-detail terrain reconstruction with mitigation of the effects of image noise. To address this issue, an improved multi-image SFS method with adaptive smoothness and brightness weighting (MI-AW-SFS) is developed for more reliable and pixel-wise 3D reconstruction, which utilizes multiple imagery and the corresponding low-resolution digital elevation model (DEM). The proposed method effectively restores fine details and accurate crater depths using an adaptive smoothness weight for each pixel based on the illumination direction gradient derived from image intensity and varying brightness weight that accounts for variations in image azimuth angles and original resolutions. Experiments were conducted using multiple Lunar Reconnaissance Orbiter Camera Narrow Angle Camera images of two potential landing areas located at the lunar south pole to validate the performance of the proposed method. Compared to the traditional single-image SFS and multi-image SFS methods, the MI-AW-SFS DEMs effectively capture intricate topographic details with reliable elevation, and comparisons with adjusted Lunar Orbiter Laser Altimeter laser points demonstrate that the MI-AW-SFS DEMs maintain overall topographic accuracy. The high-resolution surface slope and roughness maps generated from the MI-AW-SFS DEMs enable finer-scale topographic analysis. The experiment results indicate that the improved method can provide a robust solution for high-resolution lunar topographic reconstruction at the lunar south pole. |
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| ISSN: | 1538-3881 |