Least-squares diffraction imaging using shaping regularization by anisotropic smoothing

We have used least-squares migration to emphasize edge diffractions. The inverted forward-modeling operator is the chain of three operators: Kirchhoff modeling, azimuthal plane-wave destruction, and the path-summation integral filter. Azimuthal plane-wave destruction removes reflected energy without damaging edge-diffraction signatures. The path-summation integral guides the inversion toward probable diffraction locations. We combine sparsity constraints and anisotropic smoothing in the form of shaping regularization to highlight edge diffractions. Anisotropic smoothing enforces continuity along edges. Sparsity constraints emphasize diffractions perpendicular to edges and have a denoising effect. Synthetic and field data examples illustrate the effectiveness of the proposed approach in denoising and highlighting edge diffractions, such as channel edges and faults.

Employing the Perona - Malik anisotropic filter for the problem of landing site detection

The article deals with implementing a Perona - Malik anisotropic smoothing filter on a GPU . The filter features a built-in edge detector and because of this is able to preserve meaningful contours during smoothing, but its computational complexity prevents using it in real-time mode. We used the scheme suggested as an element of a landing guide detection algorithm operating on a discrete digital image. The modified filter demonstrated high performance and processing quality during simulating an optical landing system for a copter-type unmanned aerial vehicle