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Efficient encoding and decoding algorithms for distributed resampling

Journal of the Indian Society of Remote Sensing 2004年第3期32卷 269-286页

作者： Vamsi Kiran, D. Srinivasa Rao, C. Ramakrishnan, R. Gupta, P. Department of Computer Science and Engineering Indian Institute of Technology Kanpur Kanpur - 208 016 India Space Applications Center Indian Space Research Organization Ahmedabad - 380 015 India

This paper discusses algorithms for compressing floating point data which is encountered while performing resampling algorithm for rectifying geometric distortions on the images transmitted by the remote sensing satellite on a distributed computing environment. Two efficient algorithms Ibr encoding and decoding floating point data compression, (i) 3-byte packing and (ii) 3-byte + 2-bit packing have been proposed. Both algorithms are tested to execute resampling algorithm on radiometrically corrected for IRS- LISS-III 4 bands data on a distributed system. First algorithm compresses 4-byte floating point data to 3-byte obtaining 25% compression while later one compresses 4-byte floating point data to 3-byte + 2-bit achieving about 18.75% compression. The computational time is reduced by 22% as compared to the distributed resampling algorithms without compression. Further it is found that in Iossy compression algorithm only 220 pixels out of 37.4 MB pixels have utmost one Gray count difference, which will not pose any issues for digital classification or any other methods that will be employed in the corrected image by Image Analysts.

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Classification of bio-medical images using neuro fuzzy approach

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9th International Conference on Database Systems for Advanced applications, DASFAA 2004

作者： Tapaswi, Shashikala Joshi, R.C. Department of Computer Applications Madhav Institute of Technology and Science GwaliorM. P474005 India Electronics and Computer Engineering Department Indian Institute of Technology Roorkee RoorkeeUttaranchal247667 India

ISBN: (纸本)3540210474

The prime requirement for medical imaging systems is to be able to display images relating to a particular disease, there is increasing interest in the use of Image Retrieval techniques to aid diagnosis by identifying similar past cases. One area where computers have scored great success in biomedicine has been medical imaging. In biomedicine, searching digital bio-medical images is a challenging problem. Bio-medical images, such as pathology slides, usually have higher resolution than general-purpose pictures. Retrieval of biomedical images will find wide usage in the next decade. In this paper a neuro fuzzy technique for classification of biomedical images on the basis of combined feature vector, which combines color and texture feature into a single feature vector, is presented. The system uses concept based on pixel descriptors, which combines the human perception of color and texture into a single vector, for region extraction. The region extracted using the feature vectors represented in the form of pixel descriptor are fed as input to a neural network, which is trained for classification of images The method takes care of "imprecision". The user always provides partial information while posing queries. In the proposed method efforts have been made to model the imprecision using fuzzy interpretation. The technique has been implemented on the database of biomedical images. Some of the experimental results are reported in the paper. Tested on a database of more than 100 pathological/biomedical images the technique is found to be quite satisfactory. Some of the results have been reported in the paper. This technique can assist the medical community in diagnosing the disease. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Pixels

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An automated seamless mosaicing system of multi-charge coupled devices of panchromatic data

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Journal of the Indian Society of Remote Sensing 2004年第1期32卷 103-111页

作者： Ramakrishnan, R. Manthira Moorthi, S. Padmanabhan, N. Gupta, P. Data Products Software Division Signal and Image Processing Group Space Applications Centre (ISRO) Ahmedabad-380 015 India Department of Computer Science and Engineering Indian Institute of Technology Kanpur Kanpur 208 016 India

Panchromatic data of pixel resolution 5.8 m obtained from IRS-IC and IRS-ID satellites proved to be very useful for mapping purposes. One of the popular data product is the 70 km swath mosaic which is covered by a combination of 3 CCD line sensors, each with 4096 pixels. Each CCD-line sensor with different imaging times causes geometric problems of mosaicing three strips data together. In this paper, we propose the details of the design elements of system that caters to the need for accurate and automatic multi strip image registration without any second resampling of the data. The systematic geometric correction grid mapping is improved to facilitate accurate mosaicing by automatic image registration task that makes use of the overlap data within image strips and image registration is achieved up to sub-pixel level.

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An approach for conceptual modeling and extracting expressive semantics from dance videos

Lecture Notes in Computer Science (including subseries Lectu...

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Lecture Notes in computer science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2004年 3356卷 1-10页

作者： Rajkumar, K. Ramadoss, B. Ilango, Krishnamurthi Department of Computer Applications National Institute of Technology Tiruchirappalli 620015 India Department of Computer Science and Engineering National Institute of Technology Tiruchirappalli 620015 India

Due to the high complexity and exponential growth of videos, video data management tasks, such as understanding and annotating semantic content, are very difficult to be accomplished. Dance videos are one such critical domain. Considering the various dance components, understanding their semantic content conceptually, extracting the expressive semantics, annotating them properly and storing the annotations in a suitable medium for future reuse and analysis, are the essential tasks for the next generation dance systems. This paper presents a conceptual multimedia data model based on Protocol Analysis, called Video Semantics Directed Acyclic Graph (VSDAG) model. The expressive semantic content, represented by VSDAG model, is extracted from the video by a unique video annotation system. The generated annotations are stored in a XML compliant structure. © Springer-Verlag 2004.

关键词： Information management

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STUDY ON RECURSIVE CONSTRUCTION METHOD OF BIORTHOGONAL WAVELETS FOR SIGNAL PROCESSING

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International Journal of Wavelets, Multiresolution and Information Processing 2004年第2期2卷 197-206页

作者： ZHONGHONG YAN JIAN PING LI YONG QIN YANG YUAN YAN TANG Department of Bioengineering Chongqing Institute of Technology Chongqing 400050 P. R. China International Centre for Wavelet Analysis and Its Applications Logistical Engineering University Chongqing 400016 P. R. China Chongqing Jiaotong University Chongqing 400074 P. R. China Department of Computer Science Hong Kong Baptist University Hong Kong China

Wavelet has been applying in signal analyzing, image processing model recognizing, computer sense etc. But among them biorthogonal wavelets with symmetry characteristics (or antisymmetry) in the image compressing, signal examination has more special functions, this paper research a recursive construction method, at the same time, It is valuable to notice that our recursive methods are not the same as the W. Seldens's lifting scheme, the new technique has important mean to adaptive signal processing and more application: such as for QMF•CQF etc. filters. It is very easy to choose the wavelet bases match to questions by dynamically.

关键词： Signal processing recursive construction wavelets filter wavelets applications

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Solutions of a problem of Ore on spanning trees and its generalization

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Electronic Notes in Discrete Mathematics 2003年 15卷 127-130页

作者： Mund, G.B. Rao, S.B. Mohapatra, C.K. Department of Computer Science Engineering Indian Institute of Technology Kharagpur India Stat-Math Unit Indian Statistical Institute Kolkata India Institute of Mathematics and Applications Bhubaneswar India

We consider graphs, not necessarily finite, with neither loops nor multiple edges. Pertinent definitions are given below. For notation and definitions not given here, we generally follow Harary and Buckley [1]. Let G = (V,E) be a connected graph. The distance between vertices u and v in G, d_G(u,v), is the shortest length of a u - v path in G. The eccentricity of u in G, e_G(u) = sup{d_G(u,v) : v ∈ V(G)}. A spanning tree T of a graph G is called a distance preserving spanning tree of G if there exists a vertex u_T of G such that d_T(u_T,x) = d_G(u_T,x) for every vertex x of G. Note that for every vertex v of a connected graph G there exists a distance preserving spanning tree T of G with u_T = v. Every subtree of G can be extended to a spanning tree of G, by the axiom of choice. A connected graph G is said to have the property P if every spanning tree T of G is a distance preserving spanning tree of G. The following problem was posed by Ore [see [2], page 102, problem 4]. © 2005 Elsevier Ltd. All rights reserved.

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Lattice Boltzmann simulation of fluid flow in fracture networks with rough, self-affine surfaces

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Physical Review E 2003年第2期67卷 026309-026309页

作者： Mahyar Madadi Muhammad Sahimi Institute for Advanced Studies in Basic Science Gava Zang Zanjan 45195-159 Iran Institute for Computer Applications 1 University of Stuttgart Pfaffenwaldring 27 D-70569 Stuttgart Germany Department of Chemical Engineering University of Southern California Los Angeles California 90089-1211

Using the lattice Boltzmann method, we study fluid flow in a two-dimensional (2D) model of fracture network of rock. Each fracture in a square network is represented by a 2D channel with rough, self-affine internal surfaces. Various parameters of the model, such as the connectivity and the apertures of the fractures, the roughness profile of their surface, as well as the Reynolds number for flow of the fluid, are systematically varied in order to assess their effect on the effective permeability of the fracture network. The distribution of the fractures’ apertures is approximated well by a log-normal distribution, which is consistent with experimental data. Due to the roughness of the fractures’ surfaces, and the finite size of the networks that can be used in the simulations, the fracture network is anisotropic. The anisotropy increases as the connectivity of the network decreases and approaches the percolation threshold. The effective permeability K of the network follows the power law K∼〈δ〉β, where 〈δ〉 is the average aperture of the fractures in the network and the exponent β may depend on the roughness exponent. A crossover from linear to nonlinear flow regime is obtained at a Reynolds number Re∼O(1), but the precise numerical value of the crossover Re depends on the roughness of the fractures’ surfaces.

关键词： Percolation (fluids)

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Resampling routine on heterogeneous networked-based environment

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Journal of the Indian Society of Remote Sensing 2002年第1-2期30卷 7-13页

作者： Gupta, P. Khanna, V. Onong, T. Rao, Thirunadha Dube, N. Dhar, D. Ramakrishnan, R. Majumder, K.L. Department of Computer Science and Engineering Indian Institute of Technology Kanpur - 208016 India Image Processing and Data Product Group Space Applications Centre Ahmedabad - 380 053 India

In this paper, we have described a model to parallelize the resampling routine, which is used in the geometric correction of data provided by remote sensing satellites. Our model is a typical master-slave model consisting of N machines termed as hosts out of which one is designated as the master. The input image data resides on the master. Processing of the input image data is done in parallel on the N machines. Issues related to load-balancing and various error conditions that may occur during execution like one of the machines going down have been studied and are incorporated in the model. It also provides the flexibility to add or delete the hosts during the execution of the resampling routine. The serial version of this routine involves huge amount of computations and takes substantial amount of time even for an image of 473 MB. We have implemented our model with the help of PVM which is most often used in distributed computing environment. Our approach has been tested for geometric correction on LISS-III 4 band data of size 473 MB. It is found that if one uses 2. 3 or 4 hosts the overall execution time is reduced by 33%, 42% and 49%, respectively.

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Application of accelerometer data to Mars Odyssey aerobraking and atmospheric modeling

Application of accelerometer data to Mars Odyssey aerobrakin...

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AIAA/AAS Astrodynamics Specialist Conference and Exhibit 2002

作者： Tolson, R.H. Keating, G.M. George, B.E. Escalera, P.E. Werner, M.R. Dwyer, A.M. Hanna, J.L. George Washington University Joint Institute for the Advancement of Flight Sciences United States Institute for Computer Applications in Science and Engineering Langley Research Center Hampton VA 23681-2199 United States

ISBN: (纸本)9781624101243

Aerobraking was an enabling technology for the Mars Odyssey mission even though it involved risk due primarily to the variability of the Mars upper atmosphere. Consequently, numerous analyses based on various data types were performed during operations to reduce these risk and among these data were measurements from spacecraft accelerometers. This paper reports on the use of accelerometer data for determining atmospheric density during Odyssey aerobraking operations. Acceleration was measured along three orthogonal axes, although only data from the component along the axis nominally into the flow was used during operations. For a one second count time, the RMS noise level varied from 0.07 to 0.5 mm/s2 permitting density recovery to between 0.15 and 1.1 kg/km3 or about 2% of the mean density at periapsis during aerobraking. Accelerometer data were analyzed in near real time to provide estimates of density at periapsis, maximum density, density scale height, latitudinal gradient, longitudinal wave variations and location of the polar vortex. Summaries are given of the aerobraking phase of the mission, the accelerometer data analysis methods and operational procedures, some applications to determining thermospheric properties, and some remaining issues on interpretation of the data. Pre-flight estimates of natural variability based on Mars Global Surveyor accelerometer measurements proved reliable in the mid-latitudes, but overestimated the variability inside the polar vortex.

关键词： Aerobraking

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Speeding up relevance feedback in image retrieval with triangle-inequality based algorithms

Speeding up relevance feedback in image retrieval with trian...

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Ziyou Xiong Xiang Zhou William M. Pottenger Thomas S. Huang Department of Electrical and Computer Engineering Beckan Institute for Advanced Science and Technology University of Illinois Urbana-Champaign Urbana IL USA National Center for Supercomputing Applications Lehigh University Bethlehem PA USA

A content-based image retrieval(CBIR) system has been constructed to integrate relevance feedback with triangle-inequality based algorithms. The system offers typically 20 to 30 times faster retrieving speed with minimum sacrifice of retrieval performance on Corel database consisting of more than 17,000 images. The theoretic framework is built by using triangle-inequality based algorithms at sub-feature level and using relevance feedback techniques at feature level. Results show retrieval performance is clearly improved over the approach with only triangle-inequality based algorithms. A new high level weight updating method for the hierarchical distance model for relevance feedback is proposed.

关键词： Shape Mars

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