Beschreibung

This volume constitutes the refereed proceedings of the 4th Iberian Conference on Pattern Recognition and Image Analysis, IbPRIA 2009, held in Póvoa de Varzim, Portugal in June 2009. The 33 revised full papers and 29 revised poster papers presented together with 3 invited talks were carefully reviewed and selected from 106 submissions. The papers are organized in topical sections on computer vision, image analysis and processing, as well as pattern recognition.

Invited Talks.- Inference and Learning for Active Sensing, Experimental Design and Control.- Large Scale Online Learning of Image Similarity through Ranking.- Inpainting Ideas for Image Compression.- Computer Vision.- Improving Scene Recognition through Visual Attention.- Smoothed Disparity Maps for Continuous American Sign Language Recognition.- Human Action Recognition Using Optical Flow Accumulated Local Histograms.- Trajectory Modeling Using Mixtures of Vector Fields.- High-Speed Human Detection Using a Multiresolution Cascade of Histograms of Oriented Gradients.- Face-to-Face Social Activity Detection Using Data Collected with a Wearable Device.- Estimating Vehicle Velocity Using Image Profiles on Rectified Images.- Kernel Based Multi-object Tracking Using Gabor Functions Embedded in a Region Covariance Matrix.- Autonomous Configuration of Parameters in Robotic Digital Cameras.- Facial Reconstruction and Alignment Using Photometric Stereo and Surface Fitting.- Facial Feature Extraction and Change Analysis Using Photometric Stereo.- Match Selection in Batch Mosaicing Using Mutual Information.- Space Carving Acceleration Using Uncertainty Measurements.- Mean Shift Parallel Tracking on GPU.- Local Boosted Features for Pedestrian Detection.- Plane Filtering for the Registration of Urban Range Laser Imagery.- Real-Time Motion Detection for a Mobile Observer Using Multiple Kernel Tracking and Belief Propagation.- Robust and Efficient Multipose Face Detection Using Skin Color Segmentation.- Image Analysis and Processing.- Contour Regularity Extraction Based on String Edit Distance.- Cell Division Detection on the Arabidopsis Thaliana Root.- HOG-Based Decision Tree for Facial Expression Classification.- Class Representative Visual Words for Category-Level Object Recognition.- Multi-Scale Image Analysis Applied to Radioastronomical Interferometric Data.- Robust Statistical Estimation Applied to Automatic Lip Segmentation.- Textural Features for Hyperspectral Pixel Classification.- A New Clustering Algorithm for Color Image Segmentation.- A Top-Down Approach for Automatic Dropper Extraction in Catenary Scenes.- A Scale Invariant Interest Point Detector for Discriminative Blob Detection.- Enhancing In-Vitro IVUS Data for Tissue Characterization.- Toward Robust Myocardial Blush Grade Estimation in Contrast Angiography.- Multi-spectral Texture Characterisation for Remote Sensing Image Segmentation.- Texture Measuring by Means of Perceptually-Based Fineness Functions.- High Performance Circle Detection through a GPU Rasterization Approach.- Appearance and Shape Prior Alignments in Level Set Segmentation.- The Diagonal Split: A Pre-segmentation Step for Page Layout Analysis and Classification.- Robust Super-Resolution Using a Median Filter for Irregular Samples.- Left Ventricle Segmentation from Heart MDCT.- A Comparison of Wavelet Based Spatio-temporal Decomposition Methods for Dynamic Texture Recognition.- A Fast Anisotropic Mumford-Shah Functional Based Segmentation.- Labeling Still Image Databases Using Graphical Models.- Pattern Recognition.- AdaBoost Multiple Feature Selection and Combination for Face Recognition.- Median Graph Computation by Means of a Genetic Approach Based on Minimum Common Supergraph and Maximum Common Subgraph.- Fatty Liver Characterization and Classification by Ultrasound.- Sleep/Wakefulness State from Actigraphy.- A Random Extension for Discriminative Dimensionality Reduction and Metric Learning.- Minimum Error-Rate Training in Statistical Machine Translation Using Structural SVMs.- Morpheme-Based Automatic Speech Recognition of Basque.- On a Kernel Regression Approach to Machine Translation.- Experimental Analysis of Insertion Costs in a Naïve Dynamic MDF-Tree.- An Approach to Estimate Perplexity Values for Language Models Based on Phrase Classes.- An Adaptive Approach for Affine-Invariant 2D Shape Description.- Towards Real-Time Human Action Recognition.- Using One-Class Classification Techniques in the Anti-phoneme Problem.- Index of Balanced Accuracy: A Performance Measure for Skewed Class Distributions.- Chromatographic Pattern Recognition Using Optimized One-Class Classifiers.- Variable Order Finite-Context Models in DNA Sequence Coding.- Characterizing Graphs Using Spherical Triangles.- Score Fusion by Maximizing the Area under the ROC Curve.- Gender Recognition from a Partial View of the Face Using Local Feature Vectors.- Melodic Track Identification in MIDI Files Considering the Imbalanced Context.- Bernoulli HMMs at Subword Level for Handwritten Word Recognition.- Simultaneous Identity and Expression Recognition Using Face Geometry on Low Dimensional Manifolds.

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