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8th International Conference on Intelligent Systems for Molecular Biology, ISMB 2000

作者： Brändle, Norbert Chen, Horng-Yang Bischof, Horst Lapp, Hilmar Vienna University of Technology Pattern Recognition and Image Processing Group Treitlstr. 3/1832 ViennaA-1040 Austria Novartis Research Institute Vienna Genetics Brunner Str. 59 ViennaA-1230 Austria

ISBN: (纸本)1577351150

In this paper we address the problem of reliably fitting parametric and semi-parametric models to spots in high density spot array images obtained in gene expression experiments. The goal is to measure the amount of label bound to an array element. A lot of spots can be modelled accurately by a Gaussian shape. In order to deal with highly overlapping spots we use robust M-estimators. When the parametric method fails (which can be detected automatically) we use a novel, robust semi-parametric method which can handle spots of different shapes accurately. The introduced techniques are evaluated experimentally. Copyright © 2000, American Association for Artificial Intelligence (***). All rights reserved.

关键词： Gene expression

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Invariant grey-scale features for 3D sensor-data

Invariant grey-scale features for 3D sensor-data

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International Conference on pattern recognition

作者： M. Schael S. Siggelkow Institute for Pattern Recognition and Image Processing Computer Science Department University of Freiburg Freiberg Germany

ISBN: (纸本)0769507506

A technique for the construction of invariant features of 3D sensor-data is proposed. Invariant grey-scale features are characteristics of grey-scale sensor-data which remain constant if the sensor-data is transformed according to the action of a transformation group. The proposed features are capable of recognizing 3D objects independent of their orientation and position, which can be used e.g. in medical image analysis. The computation of the proposed invariants needs no preprocessing like filtering, segmentation, or registration. After the introduction of the general theory for the construction of invariant features for 3D sensor-data, the paper focuses on the special case of 3D Euclidean motion which is typical for rigid 3D objects. Due to the fact that we use the function of local support the calculated invariants are also robust with respect to independent Euclidean motion, articulated objects, and even topological deformations. The complexity of the method is linear in the data-set size which may be too high for large 3D objects. Therefore approaches for the acceleration of the computation are given. First experimental results for artificial 3D objects are presented in the paper to demonstrate the invariant properties of the proposed features.

关键词： Geometry pattern recognition Biomedical imaging Robustness image processing Computer science image recognition image motion analysis Lubricating oils image segmentation

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Gravel image Segmentation in Noisy Background Based on Partial Entropy Method

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中国地质大学学报(英文版) 2000年第1期11卷 92-94页

作者： Wang Guangjun Tian Jinwen Chen Zhenyu Liu Jian Wu Guoping State Key Laboratory for Image Processing and Intelligent Control Institute for Pattern Recognition and Artificial Intelligence Huazhong University of Science and Technology WuHan 430074 Faculty of Information Engineering China University of Geosciences Wuhan 430074

Because of wide variation in gray levels and particle dimensions and the presence of many small gravel objects in the background, as well as corrupting the image by noise, it is difficult o segment gravel objects. In this paper, we develop a partial entropy method and succeed to realize gravel objects segmentation. We give entropy principles and fur calculation methods. Moreover, we use minimum entropy error automaticly to select a threshold to segment image. We introduce the filter method using mathematical morphology. The segment experiments are performed by using different window dimensions for a group of gravel image and demonstrates that this method has high segmentation rate and low noise sensitivity.

关键词： partial entropy segmentation mathematical morphology gravel threshold filter

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A Modified Dense Displacement Field Estimation Algorithm Combined with Block-matching Method

A Modified Dense Displacement Field Estimation Algorithm Com...

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2000年第16届世界计算机大会

作者： Guo Fengjun YangXin Wilfried Philips Shi Penfei Institute of Image Processing & Pattern Recognition Shanghai Jiao Tong University TELIN Department Ghent University

In this paper,we presented a displacement field estimation algorithm based on a relaxed smoothness constraint;this algorithmcan preserve discontinuities in the displacement field to some *** image data is irregular and the images are noisy,the method produces some big residual errors in the residual *** this paper we propose an improved displacement field estimation algorithm which uses the displacement information obtained using blockmatching to modify the matching *** results show,this leads to smaller residual error maps, without introducing block artefacts,as would happen in the case of simple block matching when there is much noise in the *** the displacement filed using this method is more consistent than using a method without additional block matching.

关键词： image matching displacement field discontinuity preservation elastic matching conjugate gradient method block-matching.

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Polarization images: a geometric interpretation for shape analysis

Polarization images: a geometric interpretation for shape an...

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International Conference on pattern recognition

作者： S. Rahmann Institute for Pattern Recognition and Image Processing Computer Science Department University of Freiburg Freiburg im Breisgau Germany

ISBN: (纸本)0769507506

Presents a framework for the geometric interpretation of a single polarization image taken of specular reflecting objects. The task of recovering 3D shape information of specular objects from intensity images is a difficult if not impossible one, as no intensity based features are available. Polarization analysis provides additional features to overcome the problem. In particular the orientation of polarized light is measured, from which constraints on the object surface can be deduced. We show how to perform shape analysis from a single polarization image. The method is applied to local deformation measuring. Along with a discussion of polarization and related geometric issues, algorithms are presented and substantiated by experiments.

关键词： Shape image analysis Optical polarization Optical reflection Rough surfaces Surface roughness Surface reconstruction Performance analysis Lighting image reconstruction

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A modified dense displacement field estimation algorithm combined with block-matching method

A modified dense displacement field estimation algorithm com...

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International Conference on Signal processing Proceedings (ICSP)

作者： Guo Fengjun Yan Xin W. Philips Shi Penfei Institute of Image Processing & Pattern Recognition Shanghai Jiaotong University Shanghai China TELIN Department Ghent University Belgium

We presented a displacement field estimation algorithm based on a relaxed smoothness constraint; this algorithm can preserve discontinuities in the displacement field to some extent. Because image data is irregular and the images are noisy, the method produces some large residual errors in the residual maps. We propose an improved displacement field estimation algorithm which uses the displacement information obtained using block-matching to modify the matching result. Experimental results show, this leads to smaller residual error maps, without introducing block artefacts, as would happen in the case of simple block-matching when there is much noise in the background. Also the displacement filed using this method is more consistent than using a method without additional block-matching.

关键词： image motion analysis Mathematical model Computer vision image processing image matching pattern recognition Background noise Gradient methods Motion estimation Motion detection

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A new approach to finite wordlength coefficient fir digital filter design using the branch and bound technique 10

A new approach to finite wordlength coefficient fir digital ...

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2000 10th European Signal processing Conference, EUSIPCO 2000

作者： Belbachir, A.N. Boulerial, B. Belbachir, M.F. Signal and System Laboratory Electronic Institute U.S.T.O. B.P. 1505 El Mnouer Oran Algeria Vienna University of Technology Pattern Recognition and Image Processing Group Favritenstr. 9/1832 ViennaA-1040 Austria

ISBN: (纸本)9789521504433

It has been shown that the branch and bound technique is effective for the design of finite wordlength optimal digital filters. This technique is however expensive in computing time. In this paper, we present a robust branch and bound branching strategy named Sequential and Progressive Search, improving the design of filters on a large wordlength processor in a reasonable computing cost. The details of the algorithm and many examples are given and compared to the other methods. © 2000 EUSIPCO.

关键词： Digital filters

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Robust spot fitting for genetic spot array images

Robust spot fitting for genetic spot array images

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IEEE International Conference on image processing

作者： H.-Y. Chen N. Brandle H. Bischof H. Lapp Pattern Recognition & Image Processing Group University of Technology Vienna Vienna Austria Novartis Research Institute Vienna Genetics Vienna Austria

Addresses the problem of reliably fitting parametric and semi-parametric models to high density spot array images obtained in gene expression experiments. The goal is to measure the amount of genetic material at specific spot locations. Many spots can be modelled accurately by a Gaussian shape. In order to deal with highly overlapping spots the authors use robust M-estimators. When the parametric method fails, they use a novel, robust semi-parametric method which can handle spots of different shapes accurately. They present the results for real data and compare the complexity of the two methods.

关键词： Robustness Genetics Shape image analysis Gene expression pattern recognition image processing Lapping Safety Noise shaping

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Nearness in digital images and proximity spaces

Nearness in digital images and proximity spaces

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9th International Conference on Discrete Geometry for Computer imagery, DGCI 2000

作者： Pták, Pavel Kropatsch, Walter G. CMP – Czech Technical University Center for Machine Perception Karlovo nám. 13 Praha 2121 35 Czech Republic Institute of Computer Aided Automation 183/2 Vienna University of Technology Pattern Recognition and Image Processing Group Favoritenstr.9 WienA-1040 Austria

ISBN: (纸本)3540413960

The concept of "nearness", which has been dealt with as soon as one started studying digital images, finds one of its rigorous forms in the notion of proximity space. It is this notion, together with "nearness preserving mappings", that we investigate in this paper. We first review basic examples as they naturally occur in digital topologies, making also brief comparison studies with other concepts in digital geometry. After this we characterize proximally continuous mappings in metric spaces. Finally, we show by example that the "proximite complexity" of a finite covering in a digital picture may be too high to be adequately depicted in a finite topological space. This combinatorial result may indicate another conceptual advantage of proximities over topologies. © Springer-Verlag Berlin Heidelberg 2000.

关键词： Topology

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Unconstrained handwritten numeral recognition using Hausdorff distance and multi-layer neural network classifier 5

Unconstrained handwritten numeral recognition using Hausdorf...

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5th International Conference on Document Analysis and recognition, ICDAR 1999

作者： Wu, Xuejing Shi, Pengfei Institute of Image Processing and Pattern Recognition Shanghai Jiao Tong University Shanghai200030 China

ISBN: (纸本)0769503187

A method for zip code recognition is presented. 2D binary images are input to HAVNET, a neural network which employs the Hausdorff distance as a similarity metric to train the weights which are required to represent the patterns learned by the network. A new learning rule for HAVNET is also introduced. In this approach, HAVNET is combined with a multilayer neural network. The Hausdorff distance acts as a zip code filter. Only the confusing digits are input into the multilayer network for training or recognition. Experimental results show that the correct-recognition rate with zero rejection is more than 97% for a database used by the Chinese mail sorting system. © 1999 IEEE.

关键词： Multilayer neural networks

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