A theoretical analysis of the overall mean squared error (MSE) in hybrid video coding is presented for the case of error prone transmission. The derived model for interframe error propagation includes the eeects of INTRA coding and spatial loop ltering and corresponds to simulation results very accurately. For a given target bit rate, only four parameters are necessary to describe the overall d...

Controlled-source electromagnetics (CSEM) is a geophysical method used to find resistive reservoirs in the conductive subsurface in marine settings. We previously demonstrated how the application of synthetic aperture, virtually increasing the length and width of the CSEM source by combining the responses from multiple individual sources, improves the detectability of targets with CSEM. In this...

In applications of inversion methods to real data, nonlinear inverse problems are often simpli ed to more easily solvable linearized inverse problems. By doing so one introduces an error made by the linearization. Nonlinear inverse methods are more accurate because the methods that are used are more correct from a physical point of view. However, if data are used that have a statistical error, ...

Currently, there are numerous effective models for managing error propagation in data manipulation and analysis. But the method is still lack in handling spatial consistency. This paper focuses on the algorithms and models of error propagation for spatial consistency, investigating the basic types of spatial data inconsistency and the procedures for correcting them. Since the correction operati...

Reasoning with a Bayesian network amounts to computing probability distributions for the network’s variables. Pearl’s propagation algorithm provides for efficient reasoning with singly connected networks. When applied to a multiply connected network, the algorithm no longer yields exact probabilities, yet has been reported to result in good approximations. In this paper we provide some theoreti...

E. L. Barbier, S. Valable, C. Lucatelli, I. Troprès, C. Segebarth, C. Rémy Inserm, U594, Grenoble, F-38043, France, Univ Grenoble 1, Grenoble, F-38043, France, Inserm, IFR1, Grenoble, F-38043, France Introduction The vessel size index (VSI) provides information on the distribution of vessel radii in a voxel (1). Experimentally, it can be estimated by quantifying the changes ∆R2 and ∆R2 induced ...

21 at dierent places along the dendrites). [Hasselmo et al.] show that acetylcholine aects the synaptic connection strength of lateral but not feedforward connections in rat piriform cortex. Neuromodulators such as this could provide a means for neurons to give more or less weighting to the \teach" inputs. The neuromodulators or the teach inputs themselves could serve as a gate for learning ens...

The real challenge in any activity is to minimize as much as possible the error between an estimate and an actual value, whatever the phenomenon to be evaluated. When dealing with software, the number of proxies can be quite high: the application of an algorithm including one or more independent variables (measures) is finalized to provide one or more output variables (estimates) for a series o...

In this paper, a statistically ecient Hough transform (HT) technique with improved performance in accuracy and robustness is described. The proposed technique analytically computes the uncertainty of each feature point based on image noise, the procedure used for estimating edge orientation, and the speci®c parametric representation scheme of a line. Using the estimated uncertainty of each fea...

INTRODUCTION In a typical Diffusion Tensor Imaging (DTI) experiment, generally only one estimate of a tensor is obtained in each voxel. Since the tensor estimate itself is derived from the noisy diffusion-weighted (DW) signals, here we derive the SD of the tensor and tensor-derived quantities by error propagation from the DW signals. This error propagation technique relies on the nonlinear leas...