2002 International Telecommunications Symposium

"The image reconstruction of a two-dimensional periodic imperfect conductor by the genetic algorithm is investigated. A periodic imperfectly conducting cylinder of unknown periodic length, shape and conductivity scatters the incident wave in free space and the scattered field is recorded outside. Based on the boundary condition and the measured scattered...

"In this paper we propose a new technique for compressing stereo images using multiscale recunent patterns. The idea consists on representing blocks of the image using variable- sized elements of a dictionary. More specifically, blocks of the image ave represented by contracted, expanded or displaced elements of the dictionary. The patterns learned along...

"Among the best performing video coding methods are the ones based on the matching pursuits algorithm. In them, the motion compensated frame difference is decomposed on an overcomplete dictionary of atoms in a greedy fashion. It is represented by a sequence of pairs specifying the atoms used and their corresponding coefficients. The rate distortion...

"This article introduces a new image coding scheme based on the discrete cosine transform (DCT) applied to blocks of image pixels and on the run-length encoding of the binary digits of the DCT coefficients, bitplane by bit-plane. The main advantages of this new algorithm are: simplicity of implementation, efficiency superior to JPEG’s, in...

"Edge detection is an important operation in many image-processing applications. Anisotropic diffusion is one of most reliable edge detection methods. There are many anisotropic diffusion techniques for grayscale images. However, there are only few works on the diffusion for color images, and these all use the traditional diffusion function defined by...

"This article propose a technique of adaptive coding of images, implemented from the classification of the size blocks MxM, with the aid of the technique of segmentation of images for the detection of discontinuities in the image, generating K classes with different levels of discontinuities, containing, each one, a variable number of blocks by class....

"In image template detection, one wants to build an operator that indicates whether a given template is present in an image, preferably giving its location. In earlier works, we have approached the template detection problem by using two dimensional discriminative filtering. A discriminative filter maximizes, for a given template, the energy...

"In this paper, we propose a new object classification technique based on polygonal approximation of the open profile of object. The vertices of polygonal approximation are formed by high curvature points of the profile and they are selected by Fourier transform of the object contour. A series of features are computed from the polygonal approximation and...

"In this paper, we present a new QoS mapping mechanism for MPEG video transport in a DiffServ domain. In this mechanism, QoS indexes are defined based on the loss and delay requirements of each video flow. In agreement with these QoS indexes, the video packets are mapped in the classes of the AF service. The efficiency of this mechanism was evaluated by...

"In this work it is presented a lossless image coding method using a non-causal and non-linear prediction scheme. As in most lossless methods, each pixel is predicted from values of neighbors, and the differences between actual and predicted values are entropy coded. In the proposed method, prediction is not based only on pixels that have already been...