High-speed, high-accuracy large range 3D measurement

2019 ◽

Vol XLII-2/W18 ◽

pp. 31-37

Author(s):

E. Faresin ◽

G. Salemi

Keyword(s):

Point Cloud ◽

High Speed ◽

High Accuracy ◽

View Factor ◽

3D Measurement ◽

Sky View Factor ◽

Artificial Illumination ◽

Local Relief ◽

Swat Valley ◽

Point Cloud Analysis

Abstract. With recent advancements on 3D sensors and cloud computing, high-speed, high-accuracy 3D measurement at micrometer level have been increase by scientists community and digital humanities researchers.The methodology proposed in this project aims to test some of the algorithms used in remote-sensing to the Buddhist sculptures from Swat Valley (Pakistan); these algorithms use high-resolution topographic data to identify, from DEMs, specific features like valleys, ridges, peaks, pits or surface anomalies.In the carved stone, the surface is analysed like a landscape, where carved areas are valleys bordered by slopes and crests. One of the simplest tools, the commonly used analytical hill-shading, which simulates artificial illumination on the DEM surface, is based on the same principle as the use of an oblique light source to highlight incisions in classic photography. Other families of algorithms that can be divided into three main groups (Slope and Curvature, Local Relief Model and Sky View Factor, Positive and Negative Openness and Geomorphons) are tested here.

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High-accuracy high-speed unconstrained fringe projection profilometry of 3D measurement

Optics & Laser Technology ◽

10.1016/j.optlastec.2020.106063 ◽

2020 ◽

Vol 125 ◽

pp. 106063 ◽

Cited By ~ 1

Author(s):

Shichao Yang ◽

Gaoxu Wu ◽

Yanxue Wu ◽

Jin Yan ◽

Huifang Luo ◽

...

Keyword(s):

High Speed ◽

High Accuracy ◽

Fringe Projection ◽

3D Measurement ◽

Fringe Projection Profilometry

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Multi-Touch Interaction Generation Device by Spatiotemporally Switching Electrodes

Electronics ◽

10.3390/electronics10121475 ◽

2021 ◽

Vol 10 (12) ◽

pp. 1475

Author(s):

Masahiro Okamoto ◽

Kazuya Murao

Keyword(s):

High Speed ◽

High Accuracy ◽

Conductive Ink ◽

Control Board ◽

Touch Panel ◽

Electrode Size ◽

Touch Input ◽

Touch Interaction ◽

Multiple Electrodes ◽

Touch Panels

With the spread of devices equipped with touch panels, such as smartphones, tablets, and laptops, the opportunity for users to perform touch interaction has increased. In this paper, we constructed a device that generates multi-touch interactions to realize high-speed, continuous, or hands-free touch input on a touch panel. The proposed device consists of an electrode sheet printed with multiple electrodes using conductive ink and a voltage control board, and generates eight multi-touch interactions: tap, double-tap, long-press, press-and-tap, swipe, pinch-in, pinch-out, and rotation, by changing the capacitance of the touch panel in time and space. In preliminary experiments, we investigated the appropriate electrode size and spacing for generating multi-touch interactions, and then implemented the device. From the evaluation experiments, it was confirmed that the proposed device can generate multi-touch interactions with high accuracy. As a result, tap, press-and-tap, swipe, pinch-in, pinch-out, and rotation can be generated with a success rate of 100%. It was confirmed that all the multi-touch interactions evaluated by the proposed device could be generated with high accuracy and acceptable speed.

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