A new method to pre-segment images by means of a hierarchical description is proposed. This description is obtained from an investigation of the deep structure of a scale space image – the input image and the Gaussian filtered ones simultaneously. We concentrate on scale space critical points – points with vanishing gradient with respect to both spatial and scale direction. We show that these p...

A new method to pre-segment images by means of a hierarchical description is proposed. This description is obtained from an investigation of the deep structure of a scale space image – the input image and the Gaussian filtered ones simultaneously. We concentrate on scale space critical points – points with vanishing gradient with respect to both spatial and scale direction. We show that these p...

In this paper, an improved algorithm for pre-filtering 2D polygons is presented. The part of the polygon within the mask of a filter is decomposed into basic component regions whose parameters can be easily computed. Given the parameters, the integral of the filter over the basic component region can be looked up from a table or even be computed with a closed-form solution. The integral or its ...

In a proxy re-encryption scheme, a semi-trusted proxy can transform a ciphertext under Alice’s public key into another ciphertext that Bob can decrypt. However, the proxy cannot access the plaintext. Due to its transformation property, proxy re-encryption can be used in many applications, such as encrypted email forwarding. In this paper, by using the techniques of Canetti-Hohenberger and Kuros...

The forces promoting and constraining speciation are often studied in theoretical models because the process is hard to observe, replicate, and manipulate in real organisms. Most models analyzed to date include pre-defined functions influencing fitness, leaving open the question of how speciation might proceed without these built-in determinants. To consider the process of speciation without pr...

It is difficult to develop style-preserving source-to-source transformation engines for C and C++. The main reason is not the complexity of those languages, but the use of the C pre-processor (cpp), especially ifdefs and macros. This has for example hindered the development of refactoring tools for C and C++. In this paper we propose to combine multiple techniques and heuristics to parse C/C++ ...