Improved Fuzzy C-Means Algorithm for Image Segmentation
Issue:
Volume 3, Issue 1, February 2015
Pages:
1-5
Received:
26 December 2014
Accepted:
8 January 2015
Published:
22 January 2015
Abstract: In order to preserve more image details and enhance its robustness to noise for image segmentation, an improved fuzzy c-means algorithm (FCM) for image segmentation is presented by incorporating the local spatial information and gray level information in this paper. The modified membership function and clustering center function are more mathematically reasonable than those of the FLICM, so the iterative sequence can converge to a local minimum value of the improved objective function. The new fuzzy factor grants the algorithm a novel balance between robustness to noise and effectiveness of preserving the details. The revised algorithm flow has significantly accelerated the processing procedure. Through these improvements, the experiments on the artificial and real images show that the proposed algorithm is very effective.
Abstract: In order to preserve more image details and enhance its robustness to noise for image segmentation, an improved fuzzy c-means algorithm (FCM) for image segmentation is presented by incorporating the local spatial information and gray level information in this paper. The modified membership function and clustering center function are more mathematic...
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Particular Transient Regimes of Asynchronous Motors Supplied by PWM Converters
Monica-Adela Enache,
Sorin Enache,
Ion Vlad,
Gheorghe-Eugen Subtirelu
Issue:
Volume 3, Issue 1, February 2015
Pages:
6-11
Received:
2 February 2015
Accepted:
19 February 2015
Published:
2 March 2015
Abstract: This paper presents a few aspects regarding the analysis of some dynamic regimes of asynchronous motors supplied at variable frequency. In this purpose, in the first part of the paper, there are detailed the Simulink blocks of a program for simulating the operation of driving systems with static converters with precomputed commutation moments. Then there are presented the simulations obtained with the help of this program in case when the supply frequency is modified by jump. The accent is laid on the rate of time-dependent variation of the stator current. The results obtained are compared with the experimental results obtained with the help of a high-speed data acquisition board. The paper ends with conclusions and references.
Abstract: This paper presents a few aspects regarding the analysis of some dynamic regimes of asynchronous motors supplied at variable frequency. In this purpose, in the first part of the paper, there are detailed the Simulink blocks of a program for simulating the operation of driving systems with static converters with precomputed commutation moments. Then...
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