title: Verification of multi-view point-cloud registration for spherical harmonic cross-correlation

authors: Larkins, Robert L.

subjects: 3D imaging

abstract: Spherical harmonic cross-correlation is a robust registration algorithm that brings two point-clouds of the same scene into coarse rotational alignment. The found rotation however may not give the desired alignment, as misalignments can occur if there is not enough overlap between point-clouds, or if they contain a form of symmetry. We propose a verification method whose purpose is to determine if registration has failed for a priori unknown registration. The rotational transformation between multiple clouds must satisfy internal consistency, namely multiple rotational transformations are transitive. The rotation verification is performed using triplets of images, which are cross-referenced with each other to classify rotations individually. Testing is performed on a dataset of a priori known registrations. It is found that when the number of images or the percentage of correct rotations is increased, the number of correct rotation classifications improves. Even when tested with only four images and a correct rotation percentage of 17%, the rotation verification is still considered a viable method for classifying rotations. Spherical harmonic cross-correlation is benefited by rotation verification as it provides an additional approach for checking whether found rotations are correct.

text: Verification of multi-view point-cloud registration for spherical harmonic cross-correlation Spherical harmonic cross-correlation is a robust registration algorithm that brings two point-clouds of the same scene into coarse rotational alignment. The found rotation however may not give the desired alignment, as misalignments can occur if there is not enough overlap between point-clouds, or if they contain a form of symmetry. We propose a verification method whose purpose is to determine if registration has failed for a priori unknown registration. The rotational transformation between multiple clouds must satisfy internal consistency, namely multiple rotational transformations are transitive. The rotation verification is performed using triplets of images, which are cross-referenced with each other to classify rotations individually. Testing is performed on a dataset of a priori known registrations. It is found that when the number of images or the percentage of correct rotations is increased, the number of correct rotation classifications improves. Even when tested with only four images and a correct rotation percentage of 17%, the rotation verification is still considered a viable method for classifying rotations. Spherical harmonic cross-correlation is benefited by rotation verification as it provides an additional approach for checking whether found rotations are correct.

year: 2012

title: Neurostimulation artefact minimisation

authors: Single, Peter Scott Vallack

abstract: A neurostimulation device has a stimulus, and a position of a measurement electrode relative to the stimulus, configured such that in artefact as arising relative to distance from the stimulus electrode a minima region of the artefact is substantially co-located with the measurement electrode. Or, a ratio of the inter-electrode spacing to the electrode length is between 2 and 3.66. Or, an impedance is connected to a passive electrode and is configured to reduce artefact arising on the measurement electrode.

text: Neurostimulation artefact minimisation A neurostimulation device has a stimulus, and a position of a measurement electrode relative to the stimulus, configured such that in artefact as arising relative to distance from the stimulus electrode a minima region of the artefact is substantially co-located with the measurement electrode. Or, a ratio of the inter-electrode spacing to the electrode length is between 2 and 3.66. Or, an impedance is connected to a passive electrode and is configured to reduce artefact arising on the measurement electrode.

year: 2020

title: Permanent Forum on Indigenous Issues: Report on the thirteenth session (12-23 May 2014)

authors: Toki, Valmaine

abstract: The Permanent Forum on Indigenous Issues recommends to the Economic and Social Council the adoption of the following draft decisions:
Draft decision I
International expert group meeting on the theme “Dialogue on an optional protocol to the United Nations Declaration on the Rights of Indigenous Peoples”
Draft decision II 
Venue and dates of the fourteenth session of the Permanent Forum 
Draft decision III
Report of the Permanent Forum on Indigenous Issues on its thirteenth session and provisional agenda for its fourteenth session 
Draft decision IV
Change of name of the Permanent Forum on Indigenous Issues 
Draft decision V
Additional one-day meeting

text: Permanent Forum on Indigenous Issues: Report on the thirteenth session (12-23 May 2014) The Permanent Forum on Indigenous Issues recommends to the Economic and Social Council the adoption of the following draft decisions:
Draft decision I
International expert group meeting on the theme “Dialogue on an optional protocol to the United Nations Declaration on the Rights of Indigenous Peoples”
Draft decision II 
Venue and dates of the fourteenth session of the Permanent Forum 
Draft decision III
Report of the Permanent Forum on Indigenous Issues on its thirteenth session and provisional agenda for its fourteenth session 
Draft decision IV
Change of name of the Permanent Forum on Indigenous Issues 
Draft decision V
Additional one-day meeting

year: 2014