Earticle

The image segmentation is the most important operation in an image processing system. It is located at the joint between the processing and analysis of the images. Unsupervised segmentation aims to automatically separate the image into natural clusters. However, because of its complexity several methods have been proposed, specifically methods of optimization. In our work we are interested to the technique SFLA (Shuffled Frog-Leaping Algorithm). It's a memetic meta-heuristic algorithm that is based on frog populations in nature searching for food. This paper proposes a new approach of unsupervised image segmentation based on SFLA method. It is implemented and applied to different types of images. To validate the performances of our approach, we performed experiments which were compared to the method of K-means.

Hybrid cloud can help companies to maximize the potentiality of IT infrastructure, so the hybrid cloud is increasingly popular in the market. Hybrid cloud scheduling has become one of the important issues which cloud providers face in the current. How to effectively and safely make hybrid cloud scheduling is one of the main research topics in the field of hybrid cloud. This paper introduces an effective hybrid cloud resource management model, and proposes a hybrid cloud resource scheduling strategy based on the particle swarm leapfrog algorithm and trust mechanism in order to solve the problems. The experimental results show that the hybrid cloud scheduling strategy is effective in terms of security and throughput.

In order to overcome the drawbacks of standard shuffled frog leaping algorithm that converges slowly at the last stage and easily falls into local minima, this paper proposed two-phases learning shuffled frog leaping algorithm. The modified algorithm added the elite Gaussian learning strategy in the global information exchange phase, updated frog leaping rule and added the learning capability that the worst frog of current swarm learned from the best frog of other swarm. The learning capability of two-stage on the one hand increased the search range, on the other hand enhanced the diversity of population. Experiments were conducted on 13 classical benchmark functions, the simulation results demonstrated that the proposed approach improved the convergence rate and solution accuracy, when compared with common swarm intelligence algorithm and the latest improved shuffled frog leaping algorithm.