tailieunhanh - Báo cáo hóa học: " Enhanced computation method of topological smoothing on shared memory parallel machines"

Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí sinh học đề tài : Enhanced computation method of topological smoothing on shared memory parallel machines | Mahmoudi and Akil EURASIP Journal on Image and Video Processing 2011 2011 16 http content 2011 1 16 D EURASIP Journal on Image and Video Processing a SpringerOpen Journal RESEARCH Open Access Enhanced computation method of topological smoothing on shared memory parallel machines Ramzi Mahmoudi and Mohamed Akil Abstract To prepare images for better segmentation we need preprocessing applications such as smoothing to reduce noise. In this paper we present an enhanced computation method for smoothing 2D object in binary case. Unlike existing approaches proposed method provides a parallel computation and better memory management while preserving the topology number of connected components of the original image by using homotopic transformations defined in the framework of digital topology. We introduce an adapted parallelization strategy called split distribute and merge SDM strategy which allows efficient parallelization of a large class of topological operators. To achieve a good speedup and better memory allocation we cared about task scheduling and managing. Distributed work during smoothing process is done by a variable number of threads. Tests on 2D grayscale image 512 512 using shared memory parallel machine SMPM with 8 CPU cores 2x Xeon E5405 running at frequency of 2 GHz showed an enhancement of with cache success rate of 70 . 1. Introduction Smoothing filter is the method of choice for image preprocessing and pattern recognition. For example the analysis or recognition of a shape is often perturbed by noise thus the smoothing of object boundaries is a necessary preprocessing step. Also when warping binary digital images we obtain a crenellated result that must be smoothed for better visualization. The smoothing procedure can also be used to extract some shape characteristics by making the difference between the original and the smoothed object salient or carved parts can be detected and measured. Smoothing shape has been .

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