texture image analysis is one of the most important working realms of imageprocessing in medical sciences and industry. up to present, different approacheshave been proposed for segmentation of texture images. in this paper, we offeredunsupervised texture image segmentation based on markov random field (mrf)model. first, we used gabor filter with different parameters’ (frequency,orientation) va...

A new algorithm for 3D reconstruction of twodimensional crystals from projections is presented, and applied to biological macromolecules imaged using electron microscopy. Its main departure from the traditional approach is that it works in real space, rather than in Fourier space, and is iterative. This approach has the advantage of making it convenient to introduce additional constraints (such...

in this work, cofe2o4 nanoparticles have been prepared by co-precipitation technique. the synthesized cofe2o4 nanoparticles were applied in the preparation of cofe2o4/polyacrylonitrile fiber nanocomposites by the electrospinning process. the prepared nanoparticles and nanofibers were characterized using the scanning electron microscopy (sem) and x-ray diffraction methods. the results manifested...

The multilook technique used in synthetic aperture radar image formation consists in adding incoherently M looks. As these looks can be obtained in their complex form and are correlated, the phase and correlation informations should be taken into account in the speckle reduction process. In this paper, we propose an improved multilook technique based on the use of these two informations. We app...

A method for parameter identification of the magnetorheological damper (MRD) model with an improved firefly algorithm (IFA) is proposed, and a semi-active seat control system three-degree-of-freedom (3-DOF) established by combining quarter car to investigate ride comfort. The dynamic characteristics MRD were analyzed experimental method. Combined IFA, parameters phenomenon identified, forward M...

one of the best applications of automated navigation systems is the use of automatic steering systems in agricultural vehicles. in this research, a machine vision algorithm was designed, based on image acquisition from a camera mounted on front of acombine harvester cab fordetection of its forward path. after filtration and optimization of the image, hough transform was utilized for extracting ...

This paper proposes a Dynamic Hybrid Binary Particle Swarm Optimization (DH-BPSO) algorithm to improve the bandwidth of an inverted-F antenna (IFA). The proposed improves upon existing Artificial Immune System (AIS) by including weighting factor that dynamically changes throughout optimization. DH-BPSO activates or deactivates 12 × 2 grid parasitic patches incorporated between IFA and ground pl...

The Incremental Focus of Attention (IFA) framework provides a structure in which diierent algorithms for visual motion tracking can be assembled into a single system which tracks an object with the best combination of precision, speed, and robustness. IFA puts diierent tracking algorithms in a hierarchy based on speed and precision and supplies a means for determining which algorithm should per...

Twenty years ago Kay (1984) proposed an iterative filtering algorithm (IFA) for jointly estimating the frequencies of multiple complex sinusoids from noisy observations. It is based on the fact that the noiseless signal is an autoregressive (AR) process, so the frequency estimation problem can be reformulated as the problem of estimating the AR coefficients. By iterating the cycle of AR coeffic...