9,550 research outputs found
General Non-extremal Rotating Charged Godel Black Holes in Minimal Five-Dimensional Gauged Supergravity
We present the general exact solutions for non-extremal rotating charged
black holes in the Godel universe of five-dimensional minimal supergravity
theory. They are uniquely characterized by four non-trivial parameters, namely
the mass , the charge , the Kerr equal rotation parameter , and the
Godel parameter . We calculate the conserved energy, angular momenta and
charge for the solutions and show that they completely satisfy the first law of
black hole thermodynamics. We also study the symmetry and separability of the
Hamilton-Jacobi and the massive Klein-Gordon equations in these
Einstein-Maxwell-Chern-Simons-Godel black hole backgrounds.Comment: 4 pages, revtex4.cls. 4th revised versio
Prediction-error of Prediction Error (PPE)-based Reversible Data Hiding
This paper presents a novel reversible data hiding (RDH) algorithm for
gray-scaled images, in which the prediction-error of prediction error (PPE) of
a pixel is used to carry the secret data. In the proposed method, the pixels to
be embedded are firstly predicted with their neighboring pixels to obtain the
corresponding prediction errors (PEs). Then, by exploiting the PEs of the
neighboring pixels, the prediction of the PEs of the pixels can be determined.
And, a sorting technique based on the local complexity of a pixel is used to
collect the PPEs to generate an ordered PPE sequence so that, smaller PPEs will
be processed first for data embedding. By reversibly shifting the PPE histogram
(PPEH) with optimized parameters, the pixels corresponding to the altered PPEH
bins can be finally modified to carry the secret data. Experimental results
have implied that the proposed method can benefit from the prediction procedure
of the PEs, sorting technique as well as parameters selection, and therefore
outperform some state-of-the-art works in terms of payload-distortion
performance when applied to different images.Comment: There has no technical difference to previous versions, but rather
some minor word corrections. A 2-page summary of this paper was accepted by
ACM IH&MMSec'16 "Ongoing work session". My homepage: hzwu.github.i
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