Articles publicats Departament d'Arquitectura i Tecnologia de Computadors: Recent submissions
Now showing items 41-60 of 409
Breast density segmentation: A comparison of clustering and region based techniques
This paper presents a comparison of two clustering based algorithms and one region based algorithm for segmenting fatty and dense tissue in mammographic images. This is a crucial step in order to obtain a quantitative ...
Extrinsic visual–inertial calibration for motion distortion correction of underwater 3D scans
Underwater 3D laser scanners are an essential type of sensor used by unmanned underwater vehicles (UUVs) for operations such as navigation, inspection, and object recognition and manipulation. Scanners that acquire 3D data ...
Invoice Discounting Using Kelly Criterion by Automated Market Makers-like Implementations
Funding shortages are a persistent issue, particularly for small and medium-sized enterprises (SMEs), and the problem tends to worsen cyclically. The market for factoring and invoice discounting aims to address delays in ...
I-AUV Mechatronics Integration for the TRIDENT FP7 Project
Autonomous underwater vehicles (AUVs) are routinely used to survey areas of interest in seas and oceans all over the world. However, those operations requiring intervention capabilities are still reserved to manned ...
Automatic Detection of Underwater Chain Links using a Forward-Looking Sonar
Underwater chain cleaning and inspection tasks are costly and time consuming operations that must be performed periodically to guarantee the safety of the moorings. We propose a framework towards an efficient and costeffective ...
A concurrent region growing algorithm guided by circumscribed contours
Image segmentation of natural scenes constitutes a major problem in machine vision. This paper presents a new proposal for the image segmentation problem which has been based on the integration of edge and region information. ...
BEDA: A Computerized Assessment Battery for Dyslexia in Adults
Dyslexia is a very common learning disability in Spanish-speaking university students and requires special attention by experts and teachers to intervene with and assist affected students during their learning process. ...
Feature-based matching of underwater images
This work investigates performance of recent feature-based matching techniques when applied to registration of underwater images. Matching methods are tested versus different contrast enhancing pre-processing of images. ...
Coverage Path Planning with Real-time Replanning and Surface Reconstruction for Inspection of Three-dimensional Underwater Structures using Autonomous Underwater Vehicles
We present a novel method for planning coverage paths for inspecting complex structures on the ocean floor using an autonomous underwater vehicle (AUV). Our method initially uses a 2.5-dimensional (2.5D) prior bathymetric ...
A survey of prostate segmentation methodologies in ultrasound, magnetic resonance and computed tomography images
Prostate segmentation is a challenging task, and the challenges significantly differ from one imaging modality to another. Low contrast, speckle, micro-calcifications and imaging artifacts like shadow poses serious challenges ...
Breast peripheral area correction in digital mammograms
Digital mammograms may present an overexposed area in the peripheral part of the breast, which is visually shown as a darker area with lower contrast. This has a direct impact on image quality and affects image visualisation ...
A quantitative analysis of source detection approaches in optical, infrared, and radio astronomical images
A variety of software is used to solve the challenging task of detecting astronomical sources in wide field images. Additionally, computer vision methods based on well-known or innovative techniques are arising to face ...
Intervention AUVs: The next challenge
While commercially available AUVs are routinely used in survey missions, a new set of applications exist which clearly demand intervention capabilities. The maintenance of permanent underwater observatories, submerged oil ...
Robustness surfaces of complex networks
Despite the robustness of complex networks has been extensively studied in the last decade, there still lacks a unifying framework able to embrace all the proposed metrics. In the literature there are two open issues related ...
Visual SLAM for underwater vehicles using video velocity log and natural landmarks
A visual SLAM system has been implemented and optimised for real-time deployment on an AUV equipped with calibrated stereo cameras. The system incorporates a novel approach to landmark description in which landmarks are ...
An ATM distributed simulator for network management research
Due to the high cost of a large ATM network working up to full strength to apply our ideas about network management, i.e., dynamic virtual path (VP) management and fault restoration, we developed a distributed simulation ...
Trinocular System for 3D motion and Dense Stucture Estimation
The relief of the seafloor is an important source of data for many scientists. In this paper we present an optical system to deal with underwater 3D reconstruction. This system is formed by three cameras that take images ...
Local breast density assessment using reacquired mammographic images
The aim of this paper is to evaluate the spatial glandular volumetric tissue distribution as well as the density measures provided by Volpara™ using a dataset composed of repeated pairs of mammograms, where each pair was ...
Lesion Segmentation in Automated 3D Breast Ultrasound: Volumetric Analysis
Mammography is the gold standard screening technique in breast cancer, but it has some limitations for women with dense breasts. In such cases, sonography is usually recommended as an additional imaging technique. A ...
COLA2: A control architecture for AUVs
This paper presents a control architecture for an autonomous underwater vehicle (AUV) named the Component Oriented Layer-based Architecture for Autonomy (COLA2). The proposal implements a component-oriented layer-based ...
