4 papers
Sparse Representation of Astronomical Images
Laura Rebollo-Neira, James Bowley
Sparse representation of astronomical images is discussed. It is shown that a significant gain in sparsity is achieved when particular mixed dictionaries are used for approximating…
Self Contained Encrypted Image Folding
Laura Rebollo-Neira, James Bowley, Anthony Constantinides +1
The recently introduced approach for Encrypted Image Folding is generalized to make it Self Contained. The goal is achieved by enlarging the folded image so as to embed all the nec…
Sparse image representation by discrete cosine/spline based dictionaries
James Bowley, Laura Rebollo-Neira
Mixed dictionaries generated by cosine and B-spline functions are considered. It is shown that, by highly nonlinear approaches such as Orthogonal Matching Pursuit, the discrete ver…
Sparsity and `Something Else': An Approach to Encrypted Image Folding
James Bowley, Laura Rebollo-Neira
A property of sparse representations in relation to their capacity for information storage is discussed. It is shown that this feature can be used for an application that we term E…