Commutativity rules play an essential role when building multirate signal processing systems. In this letter, we focus on the interchangeability of block decimators and expanders. We, formally, prove that commutativity between these two operators is possible if and only if the data blocks are of an equal length corresponding to the greatest common divisor of the integer decimation and expansion...

We present computational results when computing approximations of a class of meshes with subdivision connectivity, known as 4-8 meshes. We consider algorithms using vertex decimation or vertex insertion. We explain that a full decomposition of a 4-8 mesh using global error can be obtained with an (n logn) decimation algorithm. Our algorithm produces progressive and adaptive representations of t...

In this paper a novel technique to extract facial features for recognition in frequency domain using Discrete Fourier Transform (DFT) is presented. In pre processing phase facial tilt and varying image background challenges have been addressed to improve the success rate. Varying facial expressions within class have been minimised by using decimation algorithm. Experiments on ORL and YALE datas...

This paper introduces a new multistage CIC decimation filter based on non recursive and modified recursive structure of CIC filter. The resulting decimation filter has an improved magnitude response compared with that of a corresponding conventional CIC filter. Additionally the filter is a multiplierfree and has no filtering at high input rate. The sharpening technique is used to further improv...

Rendering highly complex models can be time and space prohibitive, and decimation is an important tool in providing simplifications. A decimated model may replace the original entirely or provide level-of-detail approximations. Here we present and evaluate, quantitatively and qualitatively, methods for rapidly decimating volumetric data defined on a tetrahedral grid. Results are compared using ...

We adapt the survey propagation method for application to weighted partial maximum satisfiability (WPMax-SAT) problems consisting of a mixture of hard and soft clauses. The aim is to find the truth assignment that minimises the total cost of unsatisfied soft clauses while satisfying all hard clauses. We use fixed points of the new set of message passing equations in a decimation procedure to re...

We conducted a subjective quality assessment experiment to measure the impact of video frame rate decimation and variation in relation with impairment duration but also with content motion and texture. We found that for intermediate and high frame rate values, quality was similar independently from the duration of the frame rate decimation. On the other hand, for very low frame rates, quality d...