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  1. Article ; Online: Corrigendum: Optical See-Through Head-Mounted Displays With Short Focal Distance: Conditions for Mitigating Parallax-Related Registration Error.

    Cutolo, Fabrizio / Cattari, Nadia / Fontana, Umberto / Ferrari, Vincenzo

    Frontiers in robotics and AI

    2022  Volume 9, Page(s) 930382

    Abstract: This corrects the article DOI: 10.3389/frobt.2020.572001.]. ...

    Abstract [This corrects the article DOI: 10.3389/frobt.2020.572001.].
    Language English
    Publishing date 2022-06-07
    Publishing country Switzerland
    Document type Published Erratum
    ZDB-ID 2781824-X
    ISSN 2296-9144 ; 2296-9144
    ISSN (online) 2296-9144
    ISSN 2296-9144
    DOI 10.3389/frobt.2022.930382
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Errata to "Parallax Free Registration for Augmented Reality Optical See-Through Displays in the Peripersonal Space" [1] (DOI: 10.1109/TVCG.2020.3021534).

    Ferrari, Vincenzo / Cattari, Nadia / Fontana, Umberto / Cutolo, Fabrizio

    IEEE transactions on visualization and computer graphics

    2022  Volume 28, Issue 8, Page(s) 3069

    Abstract: In the original article, there was a mistake in the content of Table 2 page 8 column 1 as published. The values of the mean and standard deviation of the virtual-to-real overlay error in visual angles, which are reported for different checkerboard ... ...

    Abstract In the original article, there was a mistake in the content of Table 2 page 8 column 1 as published. The values of the mean and standard deviation of the virtual-to-real overlay error in visual angles, which are reported for different checkerboard distances, are to be corrected. Due to a typing error within the data analysis code, we mistakenly considered an erroneous value of the average angular resolution for the eye-replacement camera. This scale factor is used to pass from the original registration errors (expressed in pixel) to the angular registration errors (in arcmin). The value of the average angular resolution is $\approx 2.67$≈2.67 arcmin/pixel. The corrected Table 2 appears below.
    Language English
    Publishing date 2022-06-30
    Publishing country United States
    Document type Journal Article
    ISSN 1941-0506
    ISSN (online) 1941-0506
    DOI 10.1109/TVCG.2022.3176417
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Parallax Free Registration for Augmented Reality Optical See-Through Displays in the Peripersonal Space.

    Ferrari, Vincenzo / Cattari, Nadia / Fontana, Umberto / Cutolo, Fabrizio

    IEEE transactions on visualization and computer graphics

    2022  Volume 28, Issue 3, Page(s) 1608–1618

    Abstract: Egocentric augmented reality (AR) interfaces are quickly becoming a key asset for assisting high precision activities in the peripersonal space in several application fields. In these applications, accurate and robust registration of computer-generated ... ...

    Abstract Egocentric augmented reality (AR) interfaces are quickly becoming a key asset for assisting high precision activities in the peripersonal space in several application fields. In these applications, accurate and robust registration of computer-generated information to the real scene is hard to achieve with traditional Optical See-Through (OST) displays given that it relies on the accurate calibration of the combined eye-display projection model. The calibration is required to efficiently estimate the projection parameters of the pinhole model that encapsulate the optical features of the display and whose values vary according to the position of the user's eye. In this article, we describe an approach that prevents any parallax-related AR misregistration at a pre-defined working distance in OST displays with infinity focus; our strategy relies on the use of a magnifier placed in front of the OST display, and features a proper parameterization of the virtual rendering camera achieved through a dedicated calibration procedure that accounts for the contribution of the magnifier. We model the registration error due to the viewpoint parallax outside the ideal working distance. Finally, we validate our strategy on a OST display, and we show that sub-millimetric registration accuracy can be achieved for working distances of ±100 mm around the focal length of the magnifier.
    MeSH term(s) Augmented Reality ; Calibration ; Computer Graphics ; Personal Space ; Surgery, Computer-Assisted/methods ; User-Computer Interface
    Language English
    Publishing date 2022-01-28
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1941-0506
    ISSN (online) 1941-0506
    DOI 10.1109/TVCG.2020.3021534
    Database MEDical Literature Analysis and Retrieval System OnLINE

    Full text online

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  4. Article ; Online: Accuracy of the oscillometric method for the measurement of heart rate at rest and during mild exercise.

    Palatini, Paolo / Lazzaretto, Ilaria / Fontana, Umberto / Fania, Claudio

    Journal of hypertension

    2021  Volume 40, Issue 2, Page(s) 240–244

    Abstract: Objective: Whether oscillometric devices provide accurate measurements of heart rate (HR) is not known. Our aim was to determine the accuracy of an oscillometric device for the measurement of HR during rest and exercise.: Methods: The Microlife ... ...

    Abstract Objective: Whether oscillometric devices provide accurate measurements of heart rate (HR) is not known. Our aim was to determine the accuracy of an oscillometric device for the measurement of HR during rest and exercise.
    Methods: The Microlife WatchBP O3, a monitor previously validated for blood pressure measurement, was tested in 36 individuals from the general population (mean age, 72.9 years; 18 men). HR was measured at rest and during stress testing on a cycle ergometer in order to increase HR by 15% or more. HR was computed from the oscillometric waves recorded during the deflation phase of the blood pressure measurement and was compared with HR measured by pulse palpation by two observers.
    Results: At rest, the mean device-observer HR difference was 0.9 ± 2.1 bpm. During exercise, the average HR increase was 20.3% and the mean device-observer difference was 0.6 ± 2.6 bpm. The device-observer HR differences were all included within ±6 bpm both at rest and during exercise. Kappa statistics showed a very good agreement between device and observers both at rest (kappa scores, 0.82-0.88) and during exercise (kappa scores, 0.81 and 0.86). The device-observer HR differences were unrelated to the level of HR or to pulse pressure.
    Conclusion: The present study shows that the oscillometric technique is able to provide reliable HR measurements during rest and mild exercise. Whether evaluation of HR performance should be included during validation testing of automatic monitors should be established by regulatory bodies.
    MeSH term(s) Aged ; Blood Pressure ; Blood Pressure Determination ; Exercise ; Heart Rate ; Humans ; Male ; Oscillometry
    Language English
    Publishing date 2021-11-29
    Publishing country Netherlands
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 605532-1
    ISSN 1473-5598 ; 0263-6352 ; 0952-1178
    ISSN (online) 1473-5598
    ISSN 0263-6352 ; 0952-1178
    DOI 10.1097/HJH.0000000000002998
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

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  5. Article ; Online: Optical See-Through Head-Mounted Displays With Short Focal Distance: Conditions for Mitigating Parallax-Related Registration Error.

    Cutolo, Fabrizio / Cattari, Nadia / Fontana, Umberto / Ferrari, Vincenzo

    Frontiers in robotics and AI

    2020  Volume 7, Page(s) 572001

    Abstract: Optical see-through (OST) augmented reality head-mounted displays are quickly emerging as a key asset in several application fields but their ability to profitably assist high precision activities in the peripersonal space is still sub-optimal due to the ...

    Abstract Optical see-through (OST) augmented reality head-mounted displays are quickly emerging as a key asset in several application fields but their ability to profitably assist high precision activities in the peripersonal space is still sub-optimal due to the calibration procedure required to properly model the user's viewpoint through the see-through display. In this work, we demonstrate the beneficial impact, on the parallax-related AR misregistration, of the use of optical see-through displays whose optical engines collimate the computer-generated image at a depth close to the fixation point of the user in the peripersonal space. To estimate the projection parameters of the OST display for a generic viewpoint position, our strategy relies on a dedicated parameterization of the virtual rendering camera based on a calibration routine that exploits photogrammetry techniques. We model the registration error due to the viewpoint shift and we validate it on an OST display with short focal distance. The results of the tests demonstrate that with our strategy the parallax-related registration error is submillimetric provided that the scene under observation stays within a suitable view volume that falls in a ±10 cm depth range around the focal plane of the display. This finding will pave the way to the development of new multi-focal models of OST HMDs specifically conceived to aid high-precision manual tasks in the peripersonal space.
    Language English
    Publishing date 2020-12-04
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2781824-X
    ISSN 2296-9144 ; 2296-9144
    ISSN (online) 2296-9144
    ISSN 2296-9144
    DOI 10.3389/frobt.2020.572001
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Accuracy of the WatchBP O3 device for ambulatory blood pressure monitoring according to the new criteria of the ISO81060-2 2018 protocol.

    Fania, Claudio / Lazzaretto, Ilaria / Fontana, Umberto / Palatini, Paolo

    Blood pressure monitoring

    2020  Volume 25, Issue 5, Page(s) 285–290

    Abstract: Objective: The aim of the study was to determine the accuracy of the Microlife WatchBP O3 monitor for ambulatory blood pressure (BP) measurement according to the new ISO81060-2 2018 protocol.: Methods: The WatchBP O3 was first tested in 97 subjects ... ...

    Abstract Objective: The aim of the study was to determine the accuracy of the Microlife WatchBP O3 monitor for ambulatory blood pressure (BP) measurement according to the new ISO81060-2 2018 protocol.
    Methods: The WatchBP O3 was first tested in 97 subjects from the general population (mean age, 71.3 years; 48 men) using four cuffs of different sizes. In a second study, 36 subjects (mean age, 72.9 years; 18 men) underwent stress testing on a cycle ergometer in order to increase their heart rate by 15% or more.
    Results: In the general population, the mean device-observer difference was 1.3 ± 3.2 mmHg for systolic BP and was 0.7 ± 3.2 mmHg for diastolic BP. These data were in agreement with criterion 1 of the protocol standard requirements (≤5 ± 8 mmHg). Also, criterion 2 was satisfied being the SDs of the 97 participants well below the maximum values required by the protocol (6.82 and 6.90 mmHg, respectively). During the ambulatory monitoring study, the average heart rate increase was 20.3% (range 15.4-28.9%). The mean device-observer difference was 1.5 ± 2.8 mmHg for systolic BP and was 1.7 ± 2.6 mmHg for diastolic BP. Also, these data were in agreement with criterion 1 of the protocol.
    Conclusions: These data show that the Microlife WatchBP O3 monitor satisfied the ISO 81060-2:2018 standard requirements for a general population across a wide range of arm sizes and that also the protocol criteria for validation of devices intended for ambulatory BP monitoring were fulfilled.
    MeSH term(s) Aged ; Blood Pressure ; Blood Pressure Determination ; Blood Pressure Monitoring, Ambulatory ; Heart Rate ; Humans ; Male
    Language English
    Publishing date 2020-09-08
    Publishing country England
    Document type Journal Article
    ZDB-ID 1324472-3
    ISSN 1473-5725 ; 1359-5237
    ISSN (online) 1473-5725
    ISSN 1359-5237
    DOI 10.1097/MBP.0000000000000459
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 4626: Show issues Location:
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    ab Jg. 2022: Lesesaal (EG)

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