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247 results on '"Assuncao, Pedro A."'

2. Lossless Coding of Light Fields based on 4D Minimum Rate Predictors

Author

Santos, João M., Thomaz, Lucas A., Assunção, Pedro A. A., Cruz, Luís A. da Silva, Távora, Luís, and Faria, Sérgio M. M.

Subjects
Electrical Engineering and Systems Science - Image and Video Processing
Abstract

Common representations of light fields use four-dimensional data structures, where a given pixel is closely related not only to its spatial neighbours within the same view, but also to its angular neighbours, co-located in adjacent views. Such structure presents increased redundancy between pixels, when compared with regular single-view images. Then, these redundancies are exploited to obtain compressed representations of the light field, using prediction algorithms specifically tailored to estimate pixel values based on both spatial and angular references. This paper proposes new encoding schemes which take advantage of the four-dimensional light field data structures to improve the coding performance of Minimum Rate Predictors. The proposed methods expand previous research on lossless coding beyond the current state-of-the-art. The experimental results, obtained using both traditional datasets and others more challenging, show bit-rate savings no smaller than 10%, when compared with existing methods for lossless light field compression., Comment: 16 pages, 13 figures, Submitted to IEEE Transactions on Image Processing, Funded through PhD grant SFRH/BD/114894/2016, project PlenoIsla POCI-01-0145-FEDER-028325 and by FCT/MCTES through national funds and when applicable co-funded by EU funds under the project UIDB/EEA/50008/2020

Published
2021
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3. Accurate Segmentation of Dermoscopic Images based on Local Binary Pattern Clustering

Author

Pereira, Pedro M. M., Fonseca-Pinto, Rui, Paiva, Rui Pedro, Tavora, Luis M. N., Assuncao, Pedro A. A., and de Faria, Sergio M. M.

Subjects
Computer Science - Computer Vision and Pattern Recognition, Electrical Engineering and Systems Science - Signal Processing
Abstract

Segmentation is a key stage in dermoscopic image processing, where the accuracy of the border line that defines skin lesions is of utmost importance for subsequent algorithms (e.g., classification) and computer-aided early diagnosis of serious medical conditions. This paper proposes a novel segmentation method based on Local Binary Patterns (LBP), where LBP and K-Means clustering are combined to achieve a detailed delineation in dermoscopic images. In comparison with usual dermatologist-like segmentation (i.e., the available ground-truth), the proposed method is capable of finding more realistic borders of skin lesions, i.e., with much more detail. The results also exhibit reduced variability amongst different performance measures and they are consistent across different images. The proposed method can be applied for cell-based like segmentation adapted to the lesion border growing specificities. Hence, the method is suitable to follow the growth dynamics associated with the lesion border geometry in skin melanocytic images., Comment: submitted to MIPRO DC 2019

Published
2019

9. Light Field Image Compression

Author

Conti, Caroline, Ducla Soares, Luís, Nunes, Paulo, Perra, Cristian, Assunção, Pedro Amado, Sjöström, Mårten, Li, Yun, Olsson, Roger, Jennehag, Ulf, Assunção, Pedro Amado, editor, and Gotchev, Atanas, editor

Published
2019
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11. Stereo Laser Speckle Dissimilarity Analysis Using Self-organizing Maps

Author

Cunha, Francisco, Távora, Luís, Assunção, Pedro, Faria, Sérgio, FonsecaPinto, Rui, Magjarevic, Ratko, Series Editor, Ładyżyński, Piotr, Associate Editor, Ibrahim, Fatimah, Associate Editor, Lackovic, Igor, Associate Editor, Rock, Emilio Sacristan, Associate Editor, Badnjevic, Almir, editor, Škrbić, Ranko, editor, and Gurbeta Pokvić, Lejla, editor

Published
2020
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12. Prescribe and Monitor Physical Activity Through a Community-Based eHealth Program: MOVIDA Platform

Author

Fonseca-Pinto, Rui, Rijo, Rui, Assunção, Pedro, Seco, Maria Alexandra, Guarino, Maria P., Braga-Pontes, Cátia, Gomes, Dulce, Carreira, Bruno, Correia, Pedro, Oliveira, Luís, Pires, Gabriel, Leitão, Catarina, Antunes, Alexandre, Januário, Filipa, Martinho, Ricardo, Magjarevic, Ratko, Series Editor, Ładyżyński, Piotr, Associate Editor, Ibrahim, Fatimah, Associate Editor, Lackovic, Igor, Associate Editor, Rock, Emilio Sacristan, Associate Editor, Badnjevic, Almir, editor, Škrbić, Ranko, editor, and Gurbeta Pokvić, Lejla, editor

Published
2020
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13. Introduction

Author

Assunção, Pedro Amado, Gotchev, Atanas, Assunção, Pedro Amado, editor, and Gotchev, Atanas, editor

Published
2019
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19. Conclusions

Author

Corrêa, Guilherme, Assunção, Pedro, Agostini, Luciano, da Silva Cruz, Luis A., Corrêa, Guilherme, Assunção, Pedro, Agostini, Luciano, and Cruz, Luis A. da Silva

Published
2016
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22. Video Coding Background

Author

Corrêa, Guilherme, Assunção, Pedro, Agostini, Luciano, da Silva Cruz, Luis A., Corrêa, Guilherme, Assunção, Pedro, Agostini, Luciano, and Cruz, Luis A. da Silva

Published
2016
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26. Introduction

Author

Corrêa, Guilherme, Assunção, Pedro, Agostini, Luciano, da Silva Cruz, Luis A., Corrêa, Guilherme, Assunção, Pedro, Agostini, Luciano, and Cruz, Luis A. da Silva

Published
2016
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32. Complexity Analysis of HEVC Decoding for Multi-core Platforms

Author

Cordeiro, Paulo J., Assuncao, Pedro, Gómez-Pulido, Juan A., Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Moreno-Díaz, Roberto, editor, Pichler, Franz, editor, and Quesada-Arencibia, Alexis, editor

Published
2015
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43. Video Transcoding Techniques

Author

Moiron, Sandro, Ghanbari, Mohammed, Assunção, Pedro, Faria, Sérgio, Kacprzyk, Janusz, editor, Grgic, Mislav, editor, Delac, Kresimir, editor, and Ghanbari, Mohammed, editor

Published
2009
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44. Efficient Constrained Video Coding for Low Complexity Decoding

Author

Cordeiro, Paulo J., Gomez-Pulido, Juan, Assunção, Pedro A., Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Campilho, Aurélio, editor, and Kamel, Mohamed, editor

Published
2008
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