2012 XVII Symposium of Image, Signal Processing, and Artificial Vision (STSIVA)最新文献_第4页

Lighting compensation in outdoors 户外照明补偿

2012 XVII Symposium of Image, Signal Processing, and Artificial Vision (STSIVA) Pub Date : 2012-11-12 DOI: 10.1109/STSIVA.2012.6340589

D. Gomez-Melendez, K. Anaya, Sebastian Cortes, Sheila Hernandez, C. Isaza

引用次数: 0

Comparison of classification techniques for the assessment of myocardial viability by cardiac imaging with delayed MR enhancement 延迟磁共振增强心脏成像评估心肌活力的分类技术比较

2012 XVII Symposium of Image, Signal Processing, and Artificial Vision (STSIVA) Pub Date : 2012-11-12 DOI: 10.1109/STSIVA.2012.6340572

J. Pineda, X. Suarez, I. Aristizábal, J. E. Duque, A. Zuluaga, N. Aldana

{"title":"Comparison of classification techniques for the assessment of myocardial viability by cardiac imaging with delayed MR enhancement","authors":"J. Pineda, X. Suarez, I. Aristizábal, J. E. Duque, A. Zuluaga, N. Aldana","doi":"10.1109/STSIVA.2012.6340572","DOIUrl":"https://doi.org/10.1109/STSIVA.2012.6340572","url":null,"abstract":"Myocardial viability is a fundamental question in clinical decision making process and in the treatment of ischemic heart disease. Contrast enhanced Magnetic Resonance can distinguish between viable and necrotic myocardium in non-invasive manner and with excellent definition of endocardial and epicardial tissue, allowing to assess the extent of necrosis. The correct classification between pathological and healthy tissue is a fundamental process for the posterior quantification and diagnosis. Using image processing theory is possible to use automatic techniques for tissue classification; however it is difficult to choose which is better. In this paper we present a semiautomatic methodology that allows the quantification of myocardial viability in MR delayed enhancement. We evaluate the accuracy and concordance of different classification algorithms comparing the results with simulated data and with the classification of expert radiologists. It was not significant differences in the Fuzzy C-means and K-means results. The threshold classification method showed high sensibility but very low agreement. We concluded that either of the centroid-based algorithms, the Fuzzy C-means or the K-means are correct for the assessment of myocardial viability.","PeriodicalId":383297,"journal":{"name":"2012 XVII Symposium of Image, Signal Processing, and Artificial Vision (STSIVA)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128894637","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

The image quality in the measurement of atmospheric visibility from contrast indices and edges 从对比度指数和边缘测量大气能见度的图像质量

2012 XVII Symposium of Image, Signal Processing, and Artificial Vision (STSIVA) Pub Date : 2012-11-12 DOI: 10.1109/STSIVA.2012.6340581

M. Guzman, A. Restrepo

引用次数: 2

Binaural analysis of a sound source 声源的双耳分析

2012 XVII Symposium of Image, Signal Processing, and Artificial Vision (STSIVA) Pub Date : 2012-11-12 DOI: 10.1109/STSIVA.2012.6340593

J. C. Arroyave, E. E. Espinosa, G. Ricaurte

{"title":"Binaural analysis of a sound source","authors":"J. C. Arroyave, E. E. Espinosa, G. Ricaurte","doi":"10.1109/STSIVA.2012.6340593","DOIUrl":"https://doi.org/10.1109/STSIVA.2012.6340593","url":null,"abstract":"Category (2). The Localization of sound sources is one of the most important functions in the auditory system. In this paper we propose a model that simulates the localization process of sound sources in the human being; with a binaural treatment of audible signals captured by standard microphones and conventional PC sound card in a (reverberant) regular environment, we attempt to give a more clear understanding about the issues of locate the audible sources, and the concepts used in the digital processing systems, as cross correlation, Fourier analysis, among others. Besides, we will be able to create software tools that allows us to improve research and in the same time, it may clarify concepts in an interactive and accesible way. The three keys of audible location used in this project, are enough and even redundant in the determination about the orientation of the source in the azimuthal plane. Although the determination effects of distances, angular resolution and forward-backward distinction are weak compared with the real audible sensation, despite of the work with signals taken by the dummy head with and without pinna Perhaps there are other keys, ones that can play a essential part in this matters.","PeriodicalId":383297,"journal":{"name":"2012 XVII Symposium of Image, Signal Processing, and Artificial Vision (STSIVA)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132599431","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Neural activity reconstruction with MEG/EEG data considering noise regularization 考虑噪声正则化的MEG/EEG数据神经活动重构

2012 XVII Symposium of Image, Signal Processing, and Artificial Vision (STSIVA) Pub Date : 2012-11-12 DOI: 10.1109/STSIVA.2012.6340551

Camilo Ernesto Ardila Franco, José David López Hincapié, J. Espinosa

{"title":"Neural activity reconstruction with MEG/EEG data considering noise regularization","authors":"Camilo Ernesto Ardila Franco, José David López Hincapié, J. Espinosa","doi":"10.1109/STSIVA.2012.6340551","DOIUrl":"https://doi.org/10.1109/STSIVA.2012.6340551","url":null,"abstract":"CATHEGORY 2: The reconstruction of neural activity acquired with MEG/EEG devices (magnetoencephalogram/electroencephalogram) consists on generating three dimensional images indicating the location of the sources of activity. The neural activity is commonly modeled as current dipoles distributed over the cortical surface, for guaranteeing a linear propagation model though the head until the sensors placed on the scalp. There are several solution approaches used for estimating neural activity, they are mainly differentiated in the a priori information included and their sensibility to high noise levels. A comparison between different static solution approaches commonly used in the literature (minimum norm, LORETA, sLORETA) is presented in this paper. Their performance has been evaluated in different noise conditions with and without regularization for reducing uncertainty, being the general cross validation the best fitted regularization. Then it has been tested the effect of the number of dipoles used in the forward modeling; models with 5124, 8196 and 20484 dipoles were compared giving similar estimation errors but importance differences in computational effort were observed.","PeriodicalId":383297,"journal":{"name":"2012 XVII Symposium of Image, Signal Processing, and Artificial Vision (STSIVA)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115924035","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A strategy for classifying imbalanced data sets based on particle swarm optimization 一种基于粒子群优化的不平衡数据集分类策略

2012 XVII Symposium of Image, Signal Processing, and Artificial Vision (STSIVA) Pub Date : 2012-11-12 DOI: 10.1109/STSIVA.2012.6340585

C. C. Ceballes-Serrano, S. García-López, J. A. Jaramillo-Garzón, G. Castellanos-Domínguez

引用次数: 2

Radial Hilbert transform in the detect edges of fingerprinting and its application in digital correlation 指纹边缘检测中的径向希尔伯特变换及其在数字相关中的应用

2012 XVII Symposium of Image, Signal Processing, and Artificial Vision (STSIVA) Pub Date : 2012-11-12 DOI: 10.1109/STSIVA.2012.6340594

Y. Morales, L. Díaz, F. Vega, C. Torres, L. Mattos

引用次数: 0

P300 analysis based on time frequency decomposition methods for adhd discrimination in child population 基于P300分析的时频分解方法对adhd儿童人群的判别

2012 XVII Symposium of Image, Signal Processing, and Artificial Vision (STSIVA) Pub Date : 2012-11-12 DOI: 10.1109/STSIVA.2012.6340561

A. E. Castro-Ospina, L. Duque-Muñoz, G. Castellanos-Domínguez

{"title":"P300 analysis based on time frequency decomposition methods for adhd discrimination in child population","authors":"A. E. Castro-Ospina, L. Duque-Muñoz, G. Castellanos-Domínguez","doi":"10.1109/STSIVA.2012.6340561","DOIUrl":"https://doi.org/10.1109/STSIVA.2012.6340561","url":null,"abstract":"According to the Diagnostic and Statistical Manual of Mental Disorders (DSM-IV), attention deficit hyperactivity disorder (ADHD) is characterized by generalized symptoms and distortion of the lack of attention, hyperactivity and impulsiveness. ADHD is one of the most common psychological problems in childhood, with a prevalence estimated between 5% and 7%. To diagnose the presence of ADHD different techniques are used, such as neuroimaging, neuropsychological tests and neurophysiological studies. One method of the neurophysiological research is the one that records the brain's electrical activity onto potentials generated in response of a specific stimuli, which can be auditory, somatosensory or visual, known as event-related potential (ERP) or so-called cognitive evoked potentials. It is proposed to find the incidence of low-frequency bands calculated from wavelets and empirical mode decomposition to determine whether exist significative differences in the behavior of ERP waves in ADHD patients and control patients for a correct diagnosis. To do so, a database of visual evoked potentials of children between 4 and 15 years old is available, composed of 148 ADHD patients and 123 control patients.","PeriodicalId":383297,"journal":{"name":"2012 XVII Symposium of Image, Signal Processing, and Artificial Vision (STSIVA)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122166707","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Stereo matching in spatio-temporal accumulation for the estimation of vehicular mean speed 基于时空累积的立体匹配估计车辆平均速度

2012 XVII Symposium of Image, Signal Processing, and Artificial Vision (STSIVA) Pub Date : 2012-11-12 DOI: 10.1109/STSIVA.2012.6340573

Nicolas Laverde, F. Calderon

引用次数: 0

Constrained affinity matrix for spectral clustering: A basic semi-supervised extension 谱聚类的约束亲和矩阵:一个基本的半监督扩展

2012 XVII Symposium of Image, Signal Processing, and Artificial Vision (STSIVA) Pub Date : 2012-11-12 DOI: 10.1109/STSIVA.2012.6340590

C. Castro-Hoyos, D. Peluffo, C. Castellanos

引用次数: 1