Blocking artifacts are inherent and inevitable phenomena at low bit rates in current block-based video coding schemes. the paper proposes a deblocking technique to reduce blocking artifacts and improve visual quality....
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ISBN:
(纸本)0780374886
Blocking artifacts are inherent and inevitable phenomena at low bit rates in current block-based video coding schemes. the paper proposes a deblocking technique to reduce blocking artifacts and improve visual quality. Different from the post-processing technique adopted in MPEG-4, the proposed technique is directly applied to the reference image for effective motion prediction instead of just for display purposes. In other words, the deblocking filter is introduced into the motion compensation loop in the video coding. Because of the negative effects of the deblocking filter, such as blurring the details of the image, not every block boundary needs to be filtered. It has to be determined whether the boundaries between two blocks should be filtered or not. therefore, we also propose a decision-making criterion based on the available motion information (vector and mode). Experimental results show that the proposed deblocking method can improve image quality both in subjective and objective aspects. It also outperforms the post-processing technique in MPEG-4.
Carried out an analysis of wavelet transform features in medical diagnostics. the main ways of improvement of algorithms for wavelet transform for medical diagnostic systems have been suggested. A new technique of alg...
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When a robot has to interact withthe environment, force control of the contact between its actuator and the workpiece may be required. Force control tries to maintain a prescribed contact force. Basic text books ofte...
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When a robot has to interact withthe environment, force control of the contact between its actuator and the workpiece may be required. Force control tries to maintain a prescribed contact force. Basic text books often call the attention for the destabilizing digital effects, like sampling, in these systems. In this paper, the stability limits are presented in the parameter space of the sampling time, control gains and mechanical parameters. the least force error and the fastest settling force signal is calculated with simple closed form formulae. these analytical results have a central role in understanding the technical phenomena and in forming the common sense in design work. (C) 2001 Elsevier Science Ltd. All rights reserved.
this paper presents the results of the First international Newspaper Segmentation contest that was organized on the frame of ICDAR'2001 conference. the aim of this contest was to evaluate all existing algorithms f...
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ISBN:
(纸本)0769512631
this paper presents the results of the First international Newspaper Segmentation contest that was organized on the frame of ICDAR'2001 conference. the aim of this contest was to evaluate all existing algorithms for document image segmentation that can be applied to Newspaper page segmentation. We evaluated the performance of three different newspaper segmentation algorithms on tracing all basic entities that appear in newspaper pages from the beginning of the previous century up to the present. the selected entities are text regions, lines and images/drawings. Both training and test sets come,from Greek and English newspapers. the performance evaluation method is based on counting the number of matches between the entities detected by the algorithms and the entities of the ground truth. In order to rank the global performance of each participant, we employed a metric that combines the average values of detection rate and recognition accuracy.
this paper reports a study of the effect of an interphase on strain development in fibre-fragments. In order to form an interphase, an epoxy resin with known properties was applied to the surface of unsized reinforcin...
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this paper reports a study of the effect of an interphase on strain development in fibre-fragments. In order to form an interphase, an epoxy resin with known properties was applied to the surface of unsized reinforcing fibres and cured. these were then embedded in a matrix resin coupon, prior to fragmentation testing. the study included an examination of the effect of interphase thickness, by applying multiple coats of one of the resins, and the effect of the interphase properties, by varying the coating resins. It was found that the average fragment lengths at saturation were difficult to distinguish. as a result of the scatter introduced by the statistical distribution of fibre strengths. However, the strain interval between onset of fragmentation and saturation was found to be more sensitive to variations in the interphase properties. A finite element model was used to examine the strain development in the fragments in more detail. the mechanical properties of the fibre, interphase and matrix were accurately incorporated into the model. providing a realistic representation of the state of strain in the experimental samples. the predicted deformations around the fibre-break provided an explanation for the experimental observations. (C) 2001 Elsevier Science Ltd. All rights reserved.
In the paper the new approach to design parallel algorithms for the modelling of the multi-scale non-stationary processes is proposed. Our technique is based on the explicit multi-level difference schemes withthe loc...
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In this report a new algorithm is presented for the spectral factorization of a two-sided symmetric polynomial. the method is based on the discrete Fourier transform theory (DFT) and its relationship to the Z-transfor...
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A simple class of discrete recurrent neural network is analyzed to establish its possible chaotic dynamics. A two-neuron network is selected for simplicity and two cases of chaotic dynamics are distinguished, one dege...
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An investigation of parallel domain decomposition methods for interactive solution of 3D boundary value problem is presented. the various variants of algorithms are considered: the different values of subdomain overla...
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Technical analysis provides an alternative, and in some ways simpler, method of predicting stock movement. the majority of existing genetic algorithm approaches in the financial area look at fundamental stock characte...
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