We propose a video stabilization algorithm based on the rotation of a virtual sphere. Unlike traditional video stabilization algorithms relying on two-dimensional motion models or reconstruction of (3D) camera motions, the proposed virtual sphere model stabilizes video by projecting each frame onto the sphere and performing corrective rotations. Specifically, matching feature points between two adjacent frames are first projected onto two virtual spheres to obtain pairs of spherical points. Then, the rotation matrix between the previous and current frame is calculated. The resulting 3D rotation matrix sequence is used to represent the camera motion, and it is smoothed using the geodesic distance on a Riemannian manifold. Finally, the difference between the smoothed and original path allows obtaining the rotation matrix that causes camera jitter, and the virtual spheres are rotated reversely to suppress jitter. Experimental results show that the proposed algorithm can effectively reduce random jitter, outperforming state-of-the-art methods.
Guanlan is a Marine science satellite designed by Qingdao Pilot National Laboratory for Marine Science and Technology. Its application goal is to detect atmospheric parameters and ocean parameters of water bodies. In order to verify the rationality of the design of the parameters of spaceborne lidar, we use MATLAB as the basic simulation software development platform. By reasonable design of laser pulse signal source, atmospheric transmission channel, underwater transmission channel, optical system and detector receiving model, link simulation and parameter inversion. To capture the information carried by the echo signal more accurately, we use 1ns as sampling interval, the energy of each laser pulse is converted to the number of photons and then hashed in each sampling interval according to the Gauss shape, achieving the process of launching, transmitting and receiving simulated signals. The simulation results show that the software platform achieves the purpose of evaluating and guiding the design process of system parameters.
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