Track topics on Twitter Track topics that are important to you
In this paper, we introduce a non-rigid registration pipeline for unorganized point clouds that may be topologically different. Standard warp field estimation algorithms, even under robust, discontinuity-preserving regularization, produce erratic motion estimates on boundaries associated with 'close-to-open' topology changes. We overcome this limitation by exploiting backward motion: in the opposite direction, a 'close-to-open' event becomes 'open-to-close', which is by default handled correctly. Our approach relies on a general, topology-agnostic warp field estimation algorithm, similar to those employed in recent dynamic reconstruction systems from RGB-D input. We improve motion estimation on boundaries associated with topology changes in an efficient post-processing phase. Based on both forward and (inverted) backward warp hypotheses, we explicitly detect regions of the deformed geometry that undergo topological changes by means of local deformation criteria and broadly classify them as 'contacts' or 'separations'. Subsequently, the two motion hypotheses are seamlessly blended on a local basis, according to the type and proximity of detected events. Our method achieves state-of-the-art motion estimation accuracy on the MPI Sintel dataset. Experiments on a custom dataset with topological event annotations demonstrate the effectiveness of our pipeline in estimating motion on event boundaries, as well as promising performance in explicit topological event detection.
This article was published in the following journal.
Name: IEEE transactions on pattern analysis and machine intelligence
Respiration causes the deformation and sliding motion of the soft tissues, and affects the accuracy of the assessment of minimally invasive abdominal surgery. Non-rigid registration is used to elimina...
We present hierarchical spherical deformation for a group-wise shape correspondence to address template selection bias and to minimize registration distortion. In this work, we aim at a continuous and...
A point cloud that is obtained by an RGB-D camera will inevitably be affected by outliers that do not belong to the surface of the object, which is due to the different viewing angles, light intensiti...
US image registration is an important task e.g. in Computer Aided Surgery. Due to tissue deformation occurring between pre-operative and interventional images often deformable registration is necessar...
We present a novel global non-rigid registration method for dynamic 3D objects. Our method allows objects to undergo large non-rigid deformations, and achieves high quality results even with substanti...
This study will test whether a digital health intervention (DASH Cloud) using smartphones can improve diet quality among women at risk for cardiovascular disease. The DASH (Dietary Approac...
The study will help define the best tolerated approach to cystoscopy in women by randomly comparing flexible to rigid cystoscopy. Previous randomized studies evaluated rigid cystoscopy und...
This study is an open-label, prospective, single-centred, randomized control trial, containing both a quantitative and a qualitative component and using a mixed methods design, to evaluate...
Consecutive patients who are planned to undergo a medical thoracoscopy for obtaining pleural biopsies will be enrolled in the study. One hundred subjects will be randomized in 1:1 ratio t...
To investigate the efficacy of oral midazolam for patients undergoing rigid cystoscopy in: 1. relieving patient's anxiety and improving satisfaction 2. reducing procedure-related pai...
Rigid, semi-rigid, or inflatable cylindric hydraulic devices, with either combined or separate reservoir and pumping systems, implanted for the surgical treatment of organic ERECTILE DYSFUNCTION.
Storing and processing data on multiple servers that can be accessed through the Internet.
Intellectual or mental process whereby an organism becomes aware of or obtains knowledge.
The graphic registration of the frequency and intensity of sounds, such as speech, infant crying, and animal vocalizations.
The pressure at any point in an atmosphere due solely to the weight of the atmospheric gases above the point concerned.
Standard antiretroviral therapy (ART) consists of the combination of at least three antiretroviral (ARV) drugs to maximally suppress the HIV virus and stop the progression of HIV disease. Huge reductions have been seen in rates of death and suffering whe...