this paper proposes a new rotation-invariant and scale-invariant representation for texture image retrieval based on Steerable Pyramid Decomposition. By calculating the mean and standard deviation of decomposed image ...
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ISBN:
(纸本)9780769529967
this paper proposes a new rotation-invariant and scale-invariant representation for texture image retrieval based on Steerable Pyramid Decomposition. By calculating the mean and standard deviation of decomposed image subbands, the texture feature vectors are extracted. To obtain rotation or scale invariance, the feature elements are aligned by considering either the dominant orientation or dominant scale of the input textures. Experiments were conducted on the Brodatz database aiming to compare our approach to the conventional Steerable Pyramid Decomposition, and a recent proposal for texture characterization based on Gabor Wavelets with regard to their retrieval effectiveness. Results demonstrate the superiority of the proposed method in rotated and scaled image datasets.
In this paper we present further results of the application of Dempster-Shafer theory for uncertainty reasoning in corresponding distorted images in computer Vision. In a previous work [12], the model was applied to c...
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ISBN:
(纸本)0769520324
In this paper we present further results of the application of Dempster-Shafer theory for uncertainty reasoning in corresponding distorted images in computer Vision. In a previous work [12], the model was applied to correspond radiometrically distorted images, that is, images with differences in brightness and contrast, as an extension of the work developed in [I I]. the results showed the model is robust when dealing with pairs of non-equalized images and encouraged its to try to correspond geometric distorted images, that is, pairs of images in which one is rotated in relation to the other. In the conducted experiments, the right image was rotated by different angles to simulate the desired geometric distortions. the model was applied to a pair of rotated images and it successfully established the correspondence of a pair of points. As in previous works, the correspondence evidences are based on the contextual and structural features of the points and their combination is performed Dempster-Shafer's rule of combination for uncertainty reasoning. A search process maximizes the Belief on the combined evidences.
Flow visualization has been an active research field for several years and streamlines have proved to be an effective representation of two-dimensional steady vector fields. Online simulation of complex dynamic system...
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Flow visualization has been an active research field for several years and streamlines have proved to be an effective representation of two-dimensional steady vector fields. Online simulation of complex dynamic systems, computed on remote powerful computers are becoming more common. Efficient steering of the computational process requires the analysis of simulation results in real time. Visualization offers the possibility of at-a-glance analysis of the data but requires being able to download visualizations efficiently. Here we propose a wavelet model and compression scheme for streamline-based images of 2D steady vector fields. this method allows us to decrease the size of the data by a factor of 2.5 for a visualization quality comparable to the original image, and the compression factor increases to 10 if we accept small deformations. (C) 2002 Elsevier Science Ltd. All rights reserved.
the problem of image data fusion includes several techniques for data integration from different sensors about a given object. the process can be divided in two stages: (a) pixel interpolation on each observed image t...
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ISBN:
(纸本)076951846X
the problem of image data fusion includes several techniques for data integration from different sensors about a given object. the process can be divided in two stages: (a) pixel interpolation on each observed image to equalize their resolutions;and (b) synthesis of the fused image using the interpolated images. this work proposes the use of projection onto convex sets (POCS) techniques in both stages of the image data fusion process: on the interpolation stage, by creating intermediate pixels more adapted to the local characteristics of the observed images;and on the synthesis stage, by generating a final multispectral imagethat incorporates the best spatial and spectral characteristics of the initial images. As an example, the algorithm is applied to Spot satellite images.
We present the assessment of two classification procedures using a Monte Carlo experience and Landsat data. Classification performance is hard to assess with generality due to the huge number of variables involved. In...
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ISBN:
(纸本)0769526861
We present the assessment of two classification procedures using a Monte Carlo experience and Landsat data. Classification performance is hard to assess with generality due to the huge number of variables involved. In this case we consider the problem of classifying multispectral optical imagery with pointwise Gaussian Maximum Likelihood and contextual ICM (Iterated Conditional Modes), with and without errors in the training stage. Using simulation the ground truth is known and, therefore, precise comparisons are possible. the contextual approach proved being superior than the pointwise one, at the expense of requiring more computational resources, with both real and simulated data. Quantitative and qualitative results are discussed.
the single triangle-strip loop generation algorithm on a triangulated two-manifold presented by Gopi and Eppstein [4] is based on the guaranteed existence of a perfect matching in its dual graph. However such a perfec...
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ISBN:
(纸本)0769526861
the single triangle-strip loop generation algorithm on a triangulated two-manifold presented by Gopi and Eppstein [4] is based on the guaranteed existence of a perfect matching in its dual graph. However such a perfect matching is not guaranteed in the dual graph of triangulated manifolds with boundaries. In this paper we present algorithms that suitably modify the results of the dual graph matching to generate a single strip loop on manifolds with boundaries. Further the algorithm presented in [4] can produce only strip loops, but not linear strips. We present an algorithm that does topological surgery to construct linear strips, with user-specified start and end triangles, on manifolds with or without boundaries. the main contributions of this paper include graph algorithms to handle unmatched triangles, reduction of the number of Steiner vertices introduced to create strip loops, and finally a novel method to generate single linear strips with arbitrary start and end positions.
In this paper we propose a generic method to interactive object segmentation in image sequences. this method consists in the extension of efficient techniques of static image segmentation to image sequences by combini...
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ISBN:
(纸本)0769520324
In this paper we propose a generic method to interactive object segmentation in image sequences. this method consists in the extension of efficient techniques of static image segmentation to image sequences by combining them to fast motion estimation techniques. the proposed method has the following characteristics: interactivity, generality, rapid response and progressive manual edition.
作者：
Ye, BPeng, JXHuazhong Univ Sci & Technol
Inst Pattern Recognit & Artificial Intelligence State Key Lab Image Proc & Intelligent Control Wuhan 430074 Peoples R China
An improved Zernike moment using as a region-based shape descriptor is presented the improved Zernike moment not only has rotation invariance, but also has scale invariance that the unimproved Zernike moment does not ...
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ISBN:
(纸本)076951846X
An improved Zernike moment using as a region-based shape descriptor is presented the improved Zernike moment not only has rotation invariance, but also has scale invariance that the unimproved Zernike moment does not have. the experimental results show that the improved Zernike moment has better invariant properties than unimproved Zernike moment using as region-based shape descriptor.
In this work we model the problem of identifying how close structurally two proteins are as a problem of measuring the similarity between color images that represent their contact maps, where the chromatic information...
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ISBN:
(纸本)0769522270
In this work we model the problem of identifying how close structurally two proteins are as a problem of measuring the similarity between color images that represent their contact maps, where the chromatic information encodes the chemical nature of the contacts. We study two conceptually distinct methods to measure the similarity between such contact maps: a content-based image retrieval one and another based on image registration. In experiments with contact maps constructed from the PDB, the image registration approach was able to identify with 100% precision 8 instances of a protein class mixed with 28 proteins of other classes. the content-based image retrieval approach had an accuracy only a little worse than that.
Boolean expansion of binary functions has been used in the representation of binary image operators. this representation scheme induced the creation of imageprocessing architectures based on decision diagrams. In som...
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ISBN:
(纸本)076951846X
Boolean expansion of binary functions has been used in the representation of binary image operators. this representation scheme induced the creation of imageprocessing architectures based on decision diagrams. In some situations, the application of this graph-based operator over the input images is faster than the corresponding conventional approach, in that the operators are constructively described by means of basic operators and set operations. However, when the conventional architecture exploits the bit parallelism of the microprocessor logical instructions, its performance often surpasses that of the graph-based system. this article proposes a novel approach, in which the decision diagrams guide the actions of the underlying conventional architecture, taking advantage of its parallelism, so that faster imageprocessing can be achieved.
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