scholarly journals Using high frame rate CMOS sensors for three-dimensional eye tracking

2002 ◽  
Vol 34 (4) ◽  
pp. 549-560 ◽  
Author(s):  
A. H. Clarke ◽  
J. Ditterich ◽  
K. Drüen ◽  
U. Schönfeld ◽  
C. Steineke
Keyword(s):  
Eye Tracking ◽  
Three Dimensional ◽  
Frame Rate ◽  
High Frame Rate ◽  
Cmos Sensors

scholarly journals High-Frame-Rate 3-D Vector Flow Imaging in the Frequency Domain

2020 ◽  
Vol 10 (15) ◽  
pp. 5365 ◽  
Author(s):  
Stefano Rossi ◽  
Alessandro Ramalli ◽  
Fabian Fool ◽  
Piero Tortoli
Keyword(s):  
Frequency Domain ◽  
Signal To Noise Ratio ◽  
Ultrasonic Transducer ◽  
Computational Cost ◽  
Three Dimensional ◽  
Frame Rate ◽  
Velocity Measurements ◽  
High Frame Rate ◽  
Capacitive Micromachined Ultrasonic Transducer ◽  
Spiral Array

Ultrasound vector Doppler techniques for three-dimensional (3-D) blood velocity measurements are currently limited by low temporal resolution and high computational cost. In this paper, an efficient 3-D high-frame-rate vector Doppler method, which estimates the displacements in the frequency domain, is proposed. The novel method extends to 3-D an approach so far proposed for two-dimensional (2-D) velocity measurements by approximating the (x, y, z) displacement of a small volume through the displacements estimated for the 2-D regions parallel to the y and x directions, respectively. The new method was tested by simulation and experiments for a 3.7 MHz, 256-element, 2-D piezoelectric sparse spiral array. Simulations were also performed for an equivalent 7 MHz Capacitive Micromachined Ultrasonic Transducer spiral array. The results indicate performance (bias ± standard deviation: 6.5 ± 8.0) comparable to the performance obtained by using a linear array for 2-D velocity measurements. These results are particularly encouraging when considering that sparse arrays were used, which involve a lower signal-to-noise ratio and worse beam characteristics with respect to full 2-D arrays.

32.2: 360-degree Floating Light Field Three-dimensional Display Based on a High-frame-rate Color Projector

2013 ◽  
Vol 44 (1) ◽  
pp. 404-407 ◽  
Author(s):  
Xinxing Xia ◽  
Han Wang ◽  
Haifeng Li ◽  
Yifan Peng ◽  
Zhenrong Zheng ◽  
...  
Keyword(s):  
Light Field ◽  
Three Dimensional ◽  
Frame Rate ◽  
High Frame Rate ◽  
Three Dimensional Display

scholarly journals Dynamic 3D meta-holography in visible range with large frame number and high frame rate

2020 ◽  
Vol 6 (28) ◽  
pp. eaba8595 ◽  
Author(s):  
Hui Gao ◽  
Yuxi Wang ◽  
Xuhao Fan ◽  
Binzhang Jiao ◽  
Tingan Li ◽  
...  
Keyword(s):  
High Speed ◽  
Three Dimensional ◽  
Frame Rate ◽  
Visible Range ◽  
Subwavelength Structures ◽  
High Frame Rate ◽  
Holographic Display ◽  
Computer Generated Holography ◽  
Frame Number ◽  
High Modulation

The hologram is an ideal method for displaying three-dimensional images visible to the naked eye. Metasurfaces consisting of subwavelength structures show great potential in light field manipulation, which is useful for overcoming the drawbacks of common computer-generated holography. However, there are long-existing challenges to achieving dynamic meta-holography in the visible range, such as low frame rate and low frame number. In this work, we demonstrate a design of meta-holography that can achieve 228 different holographic frames and an extremely high frame rate (9523 frames per second) in the visible range. The design is based on a space channel metasurface and a high-speed dynamic structured laser beam modulation module. The space channel consists of silicon nitride nanopillars with a high modulation efficiency. This method can satisfy the needs of a holographic display and be useful in other applications, such as laser fabrication, optical storage, optics communications, and information processing.

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