Joint Variational Camera Calibration Refinement and 4-D Stereo Reconstruction Applied to Oceanic Sea States (pdf)

Video demonstration 1.

The four parts of the video are described as follows:

Top left: Real ocean surface (filmed at the Crimean Peninsula, the Black Sea). Here, only one of the videos recorded by a binocular vision rig is shown.

Top right: Variational ocean surface reconstruction (without calibration refinement). Note that zero level sets (the curves on the graph) are deliberately maked for the visualization of the difference between top right and bottom left.

Bottom left: Joint performance of variational camera calibration refinement and ocean surface reconstruction

Bottom right: The difference between the results on top right and bottom left

 

 

Video demonstration 2.

Given that computer graphics applications work as the reverse operations of 3-D reconstruction methods, we can use computer graphics techniques to evaluate the performance of our calibration refinement algorithm. We 1) created a patch of ocean surface in virtual reality and fetched the renderings as camera recordings (one is shown on top left), 2) obtained corrupted camera parameters by adding artificial errors (top right) to the true ones converted from the environment variables of virtual reality, and 3) jointly performed the calibration refinement algorithm and 4-D reconstruction algorithm to see how the reconstruction is rectified (bottom left).

The four parts of the video are described as follows:

Top left: Synthetic ocean surface generated through CUDA SDK

Top right: Artificial relative errors applied to corrupt the environment variables of virtual reality

Bottom left: Joint performance of variational camera calibration refinement and ocean surface reconstruction

Bottom right: Variational ocean surface reconstruction (without camera calibration refinement )

 

 

Thesis

Shih, P.-C., 2014. "Joint Variational Camera Calibration Refinement and 4-D Stereo Reconstruction Applied to Oceanic Sea States". PhD thesis, Georgia Institute of Technology. (pdf)

 

Journal Publications

Benetazzo, A., Fedele, F., Gallego, G., Shih, P. C., & Yezzi, A. (2012). Offshore stereo measurements of gravity waves. Coastal Engineering, 64, 127-138.

Fedele, F., Benetazzo, A., Gallego, G., Shih, P. C., Yezzi, A., & Barbariol, F. (2013). Space-time measurements of oceanic sea states. Ocean Modelling, 70, 103-115. (pdf)

 

Conference Publications

Fedele, F., Benetazzo, A., Gallego, G., Shih, P. C., Yezzi, A., & Barbariol, F. (2012). Wave Statistics and Space- time Extremes via Stereo Imaging. Proceedings of the International Offshore and Polar Engineering Conference, pp. 762-769.

Shih, P. C., Gallego, G., Yezzi, A., & Fedele, F. (2013). Improving 3-D Variational Stereo Reconstruction of Oceanic Sea States by Camera Calibration Refinement. Proceedings of the ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering

Shih, P. C., Gallego, G., Yezzi, A., & Fedele, F. (2014). Joint 4-D Variational Stereo Reconstruction and Camera Calibration Refinement for Oceanic Sea State Measurements. Proceedings of the ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering (pdf)