Percorrer por autor "Cunha, Francisco"
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- Data compression algorithms for biomedical imagesPublication . Faria, Sérgio; Cunha, Francisco; Parracho, João; Thomaz, Lucas; Assunção, PedroThe design of more efficient data structures, as well as the adoption of good information management practices applied to bioimage data, constitute very relevant initiatives. One such intervention is data compression and this text provides an overview and description of the main image compression methods, as well as an exposition of the potential of certain image formats according to specific application requirements, while ensuring the preservation of the data integrity.
- Robust Depth Estimation From Multi-Focus Plenoptic ImagesPublication . Cunha, Francisco; Thomaz, Lucas; Tavora, Luis M. N.; Assunção, Pedro A. A.; Fonseca-Pinto, Rui; Faria, Sérgio M. M.This paper describes a robust depth estimation algorithm for multi-focus plenoptic images. The main feature of the proposed method consists of a hybrid template matching scheme built-upon intensity and local phase information, which adapts to the blurriness of neighbouring lenslet microimages. By reducing the impact of defocusblur on the template matching accuracy, the proposed method efficiently handles the varying triangulation baseline over the depth-of-field, thus discarding the need for scene-related information such as the expected range of disparities. Experimental results demonstrate the robustness of the proposed method over the most used commercially available depth estimation algorithm, achieving a reduction of 73% on the depth estimation error.