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Information and Communication Technology Research - Volume:4 Issue: 1, Winter 2012

International Journal Information and Communication Technology Research
Volume:4 Issue: 1, Winter 2012

  • تاریخ انتشار: 1391/04/20
  • تعداد عناوین: 8
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  • Tahereh Hassanzadeh, Hakimeh Vojodi, Amir Masoud Eftekhari Moghadam Page 1
  • Mohammad Ramezani, Hossein Ebrahimnezhad Page 9
    In this paper, we propose a novel geometric features based method to categorize 3D models using probabilistic neural network and support vector machine classifiers. The employed features are extracted from face and vertex characteristics. In addition, we utilize the proposed features in 3D object retrieval. To achieve this end, each model is decomposed into a set of local/global geometrical features. We use histograms of two variables, i.e., deviation angle of normal vector on the object surface point from the vector that connect shape center to that point; and distance of object surface point from shape center. To achieve better separability of different models, mutual Euclidean distance histogram for the pairs of surface points is also used. The most advantage of using histogram to represent the features is that it shows the density of data and enables creating of low dimensional feature vector and consequently decreasing of computational cost in classification process. The effectiveness of our proposed 3D object categorization system has been evaluated on the generalized McGill 3D model dataset in terms of both accuracy and speed measures. Widespread experimental results and comparison with the other similar methods, demonstrate efficiency of the proposed approach to improve both accuracy and speed of categorization system.
    Keywords: 3D object, vertex normal vector, center, to, vertex vector, mutual Euclidean distance, histogram
  • Milad Moghaddam, Manoochehr Nahvi, Reza Pr. Hasanzadeh Page 21
    The most effective way for deaf people communication is sign language. Since most people are not familiar with this language, there is a requirement for a sign language translator system. This would be a useful tool specifically in emergency situations. A further need is facilitation of deaf people communication in cyberspace. Sign language gestures can be divided in two groups, including gestures represent the alphabets and those which are arbitrary signs representing specific concepts. The first group is usually introduced by the pose of hands and they are called postures while the second group usually includes motion of the hands. This paper evaluates the efficiency of kernel based feature extraction methods including kernel principle component analysis (KPCA) and kernel discriminant analysis (KDA) on Persian sign language (PSL) postures. To compare the impact of features on signs’ recognition rate, classifiers such as minimum distance (MD), support vector machine (SVM) and Neural network (NN) is used. Experimental trials indicate higher recognition rate for the kernel-based methods in comparison with those of other techniques and also previous works on PSL recognition.
    Keywords: feature extraction, kernel, based features, support vector machine, neural network, sign language recognition, PSL
  • Alireza Asvadi, Mohammadreza Karami, Yasser Baleghi Page 29
    In this paper, an improved method for object tracking is proposed using Radial Basis Function Neural Networks. Optimized k-means color segmentation is employed for detecting an object in first frame. Next the pixelbased color features (R, G, B) from object is used for representing object color and color features from surrounding background is extracted and extended to develop an extended background model. The object and extended background color features are used to train Radial Basis Function Neural Network. The trained RBFNN is employed to detect object in subsequent frames while mean-shift procedure is used to track object location. The performance of the proposed tracker is tested with many video sequences. The proposed tracker is illustrated to be able to track object and successfully resolve the problems caused by the camera movement, rotation, shape deformation and 3D transformation of the target object. The proposed tracker is suitable for real-time object tracking due to its low computational complexity.
    Keywords: component, computer vision, object tracking, k, means segmentation, radial basis function neural networks, mean shift
  • Roghayeh Soleymani, Mahrokh Ghani Shayesteh Page 41
    This paper proposes the combination of histogram based methods in order to achieve an improved contrast enhancement technique. In the proposed method, at first the histogram is modified in a way that deals with the histogram spikes with less computational complexity. A method is then utilized to preserve the mean brightness of image. In addition, black and white stretching is applied to increase the quality of resulting image. A new method is also introduced so that the stretching parameters can be selected proportional to the intensity distribution of each image. The proposed method is fully automatic, robust against noise, and user-friendly. Experimental results indicate the efficiency of the new technique from both of the objective and subjective viewpoints.
    Keywords: contrast enhancement, histogram equalization, automatic control, brightness, streching
  • Mohammad Ali Zare Chahooki, Nasrollah Moghadam Page 49
    Manifold learning is the technique that aims for finding a constructive way to embed the data from a highdimensional space into a low-dimensional one based on non-linear approaches. In this paper a supervised manifold learning method for shape recognition is proposed. The approach is based on learning the manifold space for training samples, and maps the test samples to the learned space by a Generalized Regression Neural Network (GRNN). The main goal in this paper is to propose a new feature vector to coincide semantic with Euclidean distances. To accomplish this, the desired topological manifold is learnt by a global distance driven non-linear feature extraction method. The experimental results indicated that the geometrical distances between the samples on the manifold space are more related to their semantic distance. To fuse the results of shape recognition based on contour and region based methods, the final result of shape recognition is based on committee decision in three manifold spaces. The experimental results confirmed the effectiveness and the validity of the proposed method.
    Keywords: object recognition, shape retrieval, shape annotation, manifold learning, non, linear dimension extraction
  • Zobeir Raisi, Farahnaz Mohanna, Mehdi Rezaei Page 57
    This paper proposed a scenario for using a CBIR (Content-Based Image Retrieval) system in tourism application. Several CBIR algorithms are studied and applied for the proposed scenario. An image database specialized for this application is made to be used for the study purpose. The performance of applied methods were evaluated and compared based on known measures. Among the studied CBIR methods, two algorithms perform better for this application.
    Keywords: ANMRR, Content, Based Image Retrieval, Handheld, MPEG, 7, Mobile, Tourism
  • Page 65
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