Robust Motion Segmentation from Pairwise Matches

In this paper we address a classification problem that has not been considered before, namely motion segmentation given pairwise matches only. Our contribution to this unexplored task is a novel formulation of motion segmentation as a two-step process. First, motion segmentation is performed on image pairs independently. Secondly, we combine independent pairwise segmentation results in a robust way into the final globally consistent segmentation. Our approach is inspired by the success of averaging methods. We demonstrate in simulated as well as in real experiments that our method is very effective in reducing the errors in the pairwise motion segmentation and can cope with large number of mismatches

On Computing the Translations Norm in the Epipolar Graph

This paper deals with the problem of recovering the unknown norm of relative translations between cameras based on the knowledge of relative rotations and translation directions. We provide theoretical conditions for the solvability of such a problem, and we propose a two-stage method to solve it. First, a cycle basis for the epipolar graph is computed, then all the scaling factors are recovered simultaneously by solving a homogeneous linear system. We demonstrate the accuracy of our solution by means of synthetic and real experiments.Comment: Accepted at 3DV 201

Spectral Motion Synchronization in SE(3)

This paper addresses the problem of motion synchronization (or averaging) and describes a simple, closed-form solution based on a spectral decomposition, which does not consider rotation and translation separately but works straight in SE(3), the manifold of rigid motions. Besides its theoretical interest, being the first closed form solution in SE(3), experimental results show that it compares favourably with the state of the art both in terms of precision and speed

Synchronization Problems in Computer Vision

The goal of \u201csynchronization\u201d is to infer the unknown states of a network of nodes, where only the ratio (or difference) between pairs of states can be measured. Typically, states are represented by elements of a group, such as the Symmetric Group or the Special Euclidean Group. The former can represent local labels of a set of features, which refer to the multi-view matching application, whereas the latter can represent camera reference frames, in which case we are in the context of structure from motion, or local coordinates where 3D points are represented, in which case we are dealing with multiple point-set registration. A related problem is that of \u201cbearing-based network localization\u201d where each node is located at a fixed (unknown) position in 3-space and pairs of nodes can measure the direction of the line joining their locations. In this thesis we are interested in global techniques where all the measures are considered at once, as opposed to incremental approaches that grow a solution by adding pieces iteratively

Robust Rotation Synchronization via Low-rank and Sparse Matrix Decomposition

This paper deals with the rotation synchronization problem, which arises in global registration of 3D point-sets and in structure from motion. The problem is formulated in an unprecedented way as a "low-rank and sparse" matrix decomposition that handles both outliers and missing data. A minimization strategy, dubbed R-GoDec, is also proposed and evaluated experimentally against state-of-the-art algorithms on simulated and real data. The results show that R-GoDec is the fastest among the robust algorithms.Comment: The material contained in this paper is part of a manuscript submitted to CVI

Bearing-based Network Localizability: A Unifying View

This paper provides a unifying view and offers new insights on bearing-based network localizability, that is the problem of establishing whether a set of directions between pairs of nodes uniquely determines (up to translation and scale) the position of the nodes in d-space. If nodes represent cameras then we are in the context of global structure from motion. The contribution of the paper is theoretical: first, we rewrite and link in a coherent structure several results that have been presented in different communities using disparate formalisms; second, we derive some new localizability results within the edge-based formulation

Quantum Multi-Model Fitting

Geometric model fitting is a challenging but fundamental computer vision problem. Recently, quantum optimization has been shown to enhance robust fitting for the case of a single model, while leaving the question of multi-model fitting open. In response to this challenge, this paper shows that the latter case can significantly benefit from quantum hardware and proposes the first quantum approach to multi-model fitting (MMF). We formulate MMF as a problem that can be efficiently sampled by modern adiabatic quantum computers without the relaxation of the objective function. We also propose an iterative and decomposed version of our method, which supports real-world-sized problems. The experimental evaluation demonstrates promising results on a variety of datasets. The source code is available at: https://github.com/FarinaMatteo/qmmf.Comment: In Computer Vision and Pattern Recognition (CVPR) 2023; Highligh

Dysregulated chaperones associated with cell proliferation and negative apoptosis regulation in the uterine leiomyoma

Uterine leiomyomas are benign smooth muscle cell tumors that originate from the myometrium. In this study we focus on dysregulated chaperones associated with cell proliferation and apoptosis. Paired tissue samples of 15 leiomyomas and adjacent myometria were obtained and analyzed by two-dimensional gel electrophoresis (2-DE). Mass spectrometry was used for protein identification and western blotting for 2-DE data validation. The values of 6 chaperones were found to be significantly different in the leiomyoma when compared with the myometrium. A total of 4 proteins were upregulated in the leiomyoma and 2 proteins were downregulated. Calreticulin and 78 kDa glucose-regulated protein were further validated by western blotting because the first is considered a marker of cell proliferation, while the second protects against apoptotic cell death. In addition, we also validated the two downregulated proteins heat shock protein \u3b2-1 and heat shock 70 kDa protein 1A. Our study shows the existence of a dysregulation of chaperone proteins associated with leiomyoma development. Functional studies are needed to ascertain the role of these chaperones in the leiomyoma. This may be crucial for the further development of specific inhibitors against the activity of these proteins in order to block the growth of the leiomyoma

Mappatura della letteratura sulle soluzioni digitali e tecnologiche nell'assistenza infermieristica: un protocollo di scoping review

   INTRODUCTION: Digital and technological solutions (DTS) might have an impact on people’s personal and professional lives. These types of solutions, according to studies, have the potential to revolutionize and improve the quality and long-term sustainability of healthcare activities, with nurses playing a significant role. Although DTS appears to be intimately linked to the future of nursing, technology must be utilized as an active rather than passive tool. Nonetheless, understanding DTS appears to be difficult, and a scoping study can provide a thorough overview of such a complicated topic. As a result, the scoping study on this topic will map all of the important aspects of DTS and synthesize studies on the nursing workforce, as well as analyze and clarify knowledge gaps and aid future research and development. This article presents the study protocol.  METHODS: The Joanna Briggs Institute (JBI) scoping review methodology will be used for the proposed scoping review. It will include both quantitative and qualitative scientific research as well as grey literature on DTS in nursing. Only English-language works will be considered for inclusion. Two independent reviewers will take part in an iterative process of evaluating literature, choosing papers, and extracting data. Disagreements among reviewers will be resolved through debate until a consensus is reached or through consultation with the study team if necessary. Results will be presented using descriptive statistics, diagrammatic or tabular displayed information, and narrative summaries, as specified in the JBI guidelines.  DISCUSSION: This scoping review protocol explained why it is important to describe the literature on embracing DTS in the nursing field, how to approach the research process, and what the study's key implications will be. The protocol itself may be helpful to increase transparency in the research process, attract interested researchers to work with the group that developed the protocol and offer a practical methodological benchmark for researchers interested in performing scoping reviews by serving as an example of a scoping review protocol.  KEYWORDS: Digital solutions; Technological solutions; Nursing; Scoping review; Study protocol; Framework    INTRODUZIONE: Le soluzioni digitali e tecnologiche potrebbero avere un impatto sulla vita personale e professionale della popolazione. Questi tipi di soluzioni, secondo gli studi, hanno il potenziale per rivoluzionare e migliorare la qualità e la sostenibilità a lungo termine delle attività di salute, deve gli infermieri svolgono un ruolo significativo di innovatori, facilitatori e gestori dei processi. Sebbene le soluzioni digitali e tecnologiche sembrino essere intimamente legate al futuro dell’assistenza infermieristica, la tecnologia deve essere utilizzata come strumento attivo, piuttosto che passivo. Tuttavia, la comprensione del fenomeno sembra essere difficile e una scoping review può fornire una panoramica completa di un argomento di tale complessità. Di conseguenza, la presente scoping review mapperà tutti gli aspetti salienti legati alle soluzioni digitali e tecnologiche e sintetizzerà gli studi sul coinvolgimento della professione infermieristica, nonché analizzerà e chiarirà le lacune di conoscenza presenti e aiuterà la ricerca e i progetti futuri. Questo articolo presenta il protocollo di studio di scoping review per raggiungere l’obiettivo di mappatura della letteratura.  METODI: Il protocollo utilizza la metodologia di scoping review del Joanna Briggs Institute (JBI). Comprenderà sia la ricerca scientifica quantitativa che qualitativa, nonché la letteratura grigia sulle soluzioni digitali e tecnologiche nell’assistenza infermieristica. Solo i lavori in lingua inglese saranno presi in considerazione per l’inclusione. Due revisori indipendenti prenderanno parte a un processo iterativo di valutazione della letteratura, scelta dei documenti ed estrazione dei dati. I disaccordi tra i revisori saranno risolti attraverso il dibattito fino al raggiungimento di un consenso o attraverso la consultazione con il gruppo di studio, ove necessario. I risultati saranno presentati utilizzando statistiche descrittive, le informazioni presentate in forma grafica, tabulare o a mezzo narrativo, come specificato nelle linee guida JBI.  DISCUSSIONE: Questo protocollo di scoping review intende definire perché è importante descrivere la letteratura sull’adozione delle soluzioni digitali e tecnologiche in ambito infermieristico, come affrontare il processo di ricerca sottostante alla revisione e quali saranno le implicazioni chiave dello studio. Il protocollo stesso può essere utile per aumentare la trasparenza nel processo di ricerca, ingaggiare i ricercatori interessati a lavorare con il gruppo che ha sviluppato il protocollo (research engagement) e offrire un punto di riferimento metodologico e pratico per i ricercatori interessati a svolgere revisioni nel medesimo ambito.  PAROLE CHIAVE: Soluzioni digitali; Soluzioni tecnologiche; Infermieristica; Revisione della letteratura; Protocollo di studi