Let k = Fq be a finite field of odd characteristic. We find a closed formula for the number of k-isomorphism classes of pointed, and non-pointed, hyperelliptic curves of genus g over k, admitting a Koblitz model. These numbers are expressed as a polynomial in q with integer coefficients (for pointed curves) and rational coefficients (for nonpointed curves). The coefficients depend on g and the ...

Shape recognition of a transparent object is usually difficult to perform by image processing techniques, because the major portion of the light projected onto an object passes through the object. As a result, the object cannot gain the light intensity required for image processing. Ultrasonic sensors are often utilised in situations where such optical sensors cannot be used. Moreover, systems ...

A structured light system provides a dense sampling of 3D coordinates from visible surfaces in a scene. This paper compares several methods for determining the principle frame, Gaussian curvature, and mean curvature at each visible surface point from this data. The principle frame, etc, parameterize a model which completely characterizes the local surface geometry. Given the local surface model...

Automated detection of vehicles in front can be used as a component of systems for forward collision avoidance and mitigation. When driving in dark conditions, vehicles in front are generally visible by their tail and brake lights. We present an algorithm that detects vehicles at night using a camera by searching for tail lights. Knowledge of colour, size, symmetry and position of rear facing v...

In this paper an approach to real-time position correction and environmental modeling based on odom-etry, ultrasonic sensing, structured light sensing and active stereo vision (bin-and trinocular) is presented. Odometry provides the robot with a position estimation and with the help of a model of the environment sensor perceptions can be matched to predictions. Ul-trasonic sensing is capable of...

Light field editing is a complex task, due to the large amount of data and the need to keep consistency between views. This has hampered the creation of efficient edit propagation methods, similar to those existing for single images. We propose a framework to edit light fields at interactive rates, by propagating some sparse user edits in the full light field. This propagation is guided by a no...

A report on the status of the development of picosecond photoconductive detectors is presented. The main application of these devices is the single-shot temporal measurement of picosecond X-ray, UV, and visible light pulses. We compare different materials, and describe the X-ray autocorrelator and the single-shot sampler developed in the LETI (Grenoble). Submitted to the 9th International Works...

A critique of the proposed encryption scheme based on the DLP γ = αβ is provided. It is described how a plaintext can be obtained from a valid ciphertext by computing a single traditional discrete logarithm in a cyclic group. Furthermore, it is shown that the proposed encryption scheme is in fact equivalent to the ElGamal encryption scheme.

Description Logic Programs (DLP) have been described as a description logic (DL) that is in the “expressive intersection” of DL and datalog. This is a very weak guideline for defining DLP in a way that can be claimed to be optimal or maximal in any sense. Moreover, other DL fragments such as EL and Horn-SHIQ have also been “expressed” using datalog. Is DLP just one out of many equal DLs in this...

We propose a new threshold signature scheme based on conic curve. The security of the proposed threshold signature scheme is based on the difficulty of computing the DLP in conic curve groups. It can resist some of the known attacks. Since an exciting characteristic of conic is both encoding and decoding over conic are easily implemented, it can be used in the mobile payment system with the lim...