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9 results on '"de Paiva, Maria Stela Veludo"'

1. ALPRS - A New Approach for License Plate Recognition using the Sift Algorithm

Author

da Silva, Francisco Assis, Artero, Almir Olivette, de Paiva, Maria Stela Veludo, and Barbosa, Ricardo Luis

Subjects
Computer Science - Computer Vision and Pattern Recognition
Abstract

This paper presents a new approach for the automatic license plate recognition, which includes the SIFT algorithm in step to locate the plate in the input image. In this new approach, besides the comparison of the features obtained with the SIFT algorithm, the correspondence between the spatial orientations and the positioning associated with the keypoints is also observed. Afterwards, an algorithm is used for the character recognition of the plates, very fast, which makes it possible its application in real time. The results obtained with the proposed approach presented very good success rates, so much for locating the characters in the input image, as for their recognition.

Published
2013
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3. Contributors

Author

Abdel-Dayem, A., primary, Aita, Ryo, additional, Akpınar, Samet, additional, Alpaslan, Ferda Nur, additional, Aoki, Kyota, additional, Arabnia, Hamid R., additional, Arboleda-Duque, S., additional, Ardekani, R., additional, Aygün, Ramazan S., additional, The Bao, Pham, additional, Beck, Robert, additional, Blay, Christopher, additional, Chen, H., additional, Choi, Haijung, additional, Coelho, Clarimar José, additional, Costa, Eduardo Tavares, additional, da Silva Soares, Anderson, additional, Damavandinejadmonfared, Sepehr, additional, de Paiva, Maria Stela Veludo, additional, Deligiannidis, Leonidas, additional, Dinç, İmren, additional, Dinç, Semih, additional, Doerfler, Gregory, additional, Dong, Min, additional, Ektesabi, Arezoo, additional, Elsalamony, Hany A., additional, Foley, B., additional, Ghorbel, Faouzi, additional, Gómez-Mendoza, J.B., additional, Granero, Marco Aurélio, additional, Gutierrez, Marco Antônio, additional, Hariyama, M., additional, Hematian, A., additional, Huang, Chuen-Min, additional, Hung, Nguyen Tuan, additional, Ilie, M., additional, Jamal, Rowa’a, additional, Johnson, J., additional, Kang, Eui Sun, additional, Kapoor, Ajay, additional, Karimian, A., additional, Khalaf, Loay, additional, Kim, Jin Young, additional, Kim, Manbae, additional, Klässner, Bernd, additional, Kulyukin, Vladimir, additional, Laureano, Gustavo Teodoro, additional, Lu, Xiangyu, additional, Ma, Yide, additional, Mahmoudpour, Saeed, additional, Manaa, Karmel, additional, Marjoram, P., additional, Mezghich, Mohamed Amine, additional, M’Hiri, Slim, additional, Miranda, José Manuel, additional, Montes-Venegas, Hector A., additional, Morales, Oswaldo, additional, Moreno, Jaime, additional, Park, Dae Hyuck, additional, Pashna, M., additional, Petrosino, Alfredo, additional, Pusey, Marc L., additional, Rabee’a, Maram, additional, Romero, Marcelo, additional, Saadatseresht, M., additional, Saidani, Maweheb, additional, Salvi, Giuseppe, additional, Seo, Jeong Goo, additional, Seybold, Tamara, additional, Shimoda, M., additional, Sigdel, Madhav, additional, Sigdel, Madhu S., additional, Spinczyk, Dominik, additional, Stechele, Walter, additional, Stirb, Iulia, additional, Su, Hongjun, additional, Talebi, R., additional, Tamayo-Quintero, J.D., additional, Tejeida, Ricardo, additional, Uddin, Md. Zia, additional, Varadharajan, Vijay, additional, Wang, Keju, additional, Xiao, Chuangbai, additional, Yazdani, S., additional, Yusof, R., additional, Zhang, Hong, additional, Zhao, Hongyu, additional, and Zhao, Huaxia, additional

Published
2015
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5. Feathering effect detection and artifact agglomeration index-based video deinterlacing technique.

Author

Martins, André Luis, Rodrigues, Evandro Luis Linhari, and de Paiva, Maria Stela Veludo

Subjects
IMAGE quality in imaging systems, PIXELS, IMAGE segmentation, SIGNAL denoising, IMAGE analysis
Abstract

Several video deinterlacing techniques have been developed, and each one presents a better performance in certain conditions. Occasionally, even the most modern deinterlacing techniques create frames with worse quality than primitive deinterlacing processes. This paper validates that the final image quality can be improved by combining different types of deinterlacing techniques. The proposed strategy is able to select between two types of deinterlaced frames and, if necessary, make the local correction of the defects. This decision is based on an artifact agglomeration index obtained from a feathering effect detection map. Starting from a deinterlaced frame produced by the "interfield average" method, the defective areas are identified, and, if deemed appropriate, these areas are replaced by pixels generated through the "edge-based line average" method. Test results have proven that the proposed technique is able to produce video frames with higher quality than applying a single deinterlacing technique through getting what is good from intra- and interfield methods. ©2018 SPIE and IS&T[DOI: 10.1117/1.JEI.27.2.023010] [ABSTRACT FROM AUTHOR]

Published
2018
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6. Aplicação das Políticas de Balanceamento de Carga do Tree Load Balancing Algorithm em Simulações

Author

Raphaloski, Evandro and de Paiva, Maria Stela Veludo

Subjects
Alto Desempenho e Simuladores, Políticas de Balanceamento de Carga
Abstract

Os algoritmos de balanceamento de carga são aplicados em ambientes homogêneos, heterogêneos, distribuídos localmente e grids, visando um melhor desempenho do sistema, a fim de distribuir de forma eqüitativa a carga de processos entre todos os computadores envolvidos na rede. Para que isto seja possível esses algoritmos são dotados de políticas de balanceamento de carga que gerenciam e coordenam desde a localização dos computadores mais ociosos até a transferência do processo propriamente dito. Para melhorar o desempenho de um sistema, baseado na aplicação de políticas de balanceamento de carga, recentemente foi proposto um algoritmo de balanceamento de carga denominado Tree Load Balancing Algorithm. Para avaliá-lo foram desenvolvidos um simulador e um protótipo que validaram seus resultados. Este trabalho apresenta a implementação de um novo simulador, que permite o estudo e a aplicação das políticas de balanceamento de carga deste algoritmo, em busca de um melhor desempenho de sistemas distribuídos.

Published
2006

8. Ultrasonic Signal Processing Hybrid Technique for Analysis of Alcoholic Fermentation Process.

Author

Villamarín, Julián A. and de Paiva, Maria Stela Veludo

Subjects
*FERMENTATION, *ULTRASONICS, *DIGITAL signal processing, *LIQUID mixtures, *QUANTITATIVE research, *SACCHAROMYCES cerevisiae, *PARAMETERS (Statistics), *BACKSCATTERING
Abstract

An analysis of the alcoholic fermentation bioprocess by quantitative ultrasound signal processing is shown in this study. The main objectives were to detect, characterize and classify the dispersed and continuous phases of a liquid mixture during its fermentation process. The liquid mixture is a liquid-solid system composed by sugarcane juice and yeast species saccharomyces cerevisiae. This sample study was monitored by ultrasound exposure in pulse-echo mode during the fermentation bioprocess and then ultrasound backscattering echoes were recorded in RoI. The computational procedures implemented for ultrasonic characterization were based in the extraction of spectral attributes (central frequency, spectral bandwidth, etc.), ultrasonic parameters (such as attenuation and the integrated backscattering coefficient), stationarity analysis by non-parametric statistical Run Test, backscattering waveform analysis by Curve Fitting on bandwidth spectrum and data classification by k-means algorithm. The main results showed a parametric discrimination of regions inside liquid system with and without solid particles during the fermentation evolution. Further, it was identified the stationary state in the death phase of the fermentation bioprocess, which corresponds to particles dilution and substrates depletion. [ABSTRACT FROM AUTHOR]

Published
2012

9. B-spline generation in FPGA.

Author

da Silva, Luiz Marcelo Chiesse and de Paiva, Maria Stela Veludo

Abstract

B-spline curves can represent almost any smooth shape, being adopted by file exchange standards, used as a wavelet basis for multiresolution systems and manufacturing efficiency is increased using b-splines toolpaths. The respective algorithms for conventional CPUs demand great computational effort, requiring another hardware architectures, like GPUs, for better processing efficiency. This paper describes a system on a chip that generates b-splines curves from given control points in a concurrent way, based in a FPGA platform, including features that are not addressed by the few works in the area. This system is faster than a quadcore CPU in the order of the number of generated points, at the same clock rate. The independence of the number of generated and initial control points, and the processing determined by the FPGA capacity, makes it a better choice for embedded systems in relation to conventional CPUs. [ABSTRACT FROM PUBLISHER]

Published
2012
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