Mapping of two-dimensional convolution on very long instruction word media processors for real-time performance

To simulate echoes from the earth’s surface in the low flight mode, it is necessary to reproduce reliably the delayed reflected sounding signal of the radar in real time. For this, it is necessary to be able to calculate accurately and quickly the dependence of the distance to the object being measured from the angular position of the line of sight of the radar station. Obviously, the simplest expressions for calculating the range can be obtained for a segment or a plane. In the text of the article, analytical expressions for the calculation of range for two-dimensional and three-dimensional cases are obtained. Methods of statistical physics, vector algebra, and the theory of the radar of extended objects were used. Since the calculation of the dependence of the range of the object to the target from the angular position of the line of sight is carried out on the analytical expressions found in the paper, the result obtained is accurate, and due to the relative simplicity of the expressions obtained, the calculation does not require much time.

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Single Depth View Based Real-Time Reconstruction of Hand-Object Interactions

ACM Transactions on Graphics ◽

10.1145/3451341 ◽

2021 ◽

Vol 40 (3) ◽

pp. 1-12

Author(s):

Hao Zhang ◽

Yuxiao Zhou ◽

Yifei Tian ◽

Jun-Hai Yong ◽

Feng Xu

Keyword(s):

Real Time ◽

Synthetic Data ◽

Real Data ◽

Depth Image ◽

Real Time System ◽

The Real ◽

Time Performance ◽

Contact Constraint ◽

Object Shapes ◽

Object Interactions

Reconstructing hand-object interactions is a challenging task due to strong occlusions and complex motions. This article proposes a real-time system that uses a single depth stream to simultaneously reconstruct hand poses, object shape, and rigid/non-rigid motions. To achieve this, we first train a joint learning network to segment the hand and object in a depth image, and to predict the 3D keypoints of the hand. With most layers shared by the two tasks, computation cost is saved for the real-time performance. A hybrid dataset is constructed here to train the network with real data (to learn real-world distributions) and synthetic data (to cover variations of objects, motions, and viewpoints). Next, the depth of the two targets and the keypoints are used in a uniform optimization to reconstruct the interacting motions. Benefitting from a novel tangential contact constraint, the system not only solves the remaining ambiguities but also keeps the real-time performance. Experiments show that our system handles different hand and object shapes, various interactive motions, and moving cameras.

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Accelerating laser processes with a smart two-dimensional polygon mirror scanner for ultra-fast beam deflection

Advanced Optical Technologies ◽

10.1515/aot-2021-0014 ◽

2021 ◽

Vol 0 (0) ◽

Author(s):

Florian Roessler ◽

André Streek

Keyword(s):

Energy Distribution ◽

Real Time ◽

Laser Processing ◽

High Speed ◽

Beam Deflection ◽

Two Dimensional ◽

Heat Accumulation ◽

Field Programmable ◽

Drill Holes ◽

Average Laser

Abstract In laser processing, the possible throughput is directly scaling with the available average laser power. To avoid unwanted thermal damage due to high pulse energy or heat accumulation during MHz-repetition rates, energy distribution over the workpiece is required. Polygon mirror scanners enable high deflection speeds and thus, a proper energy distribution within a short processing time. The requirements of laser micro processing with up to 10 kW average laser powers and high scan speeds up to 1000 m/s result in a 30 mm aperture two-dimensional polygon mirror scanner with a patented low-distortion mirror configuration. In combination with a field programmable gate array-based real-time logic, position-true high-accuracy laser switching is enabled for 2D, 2.5D, or 3D laser processing capable to drill holes in multi-pass ablation or engraving. A special developed real-time shifter module within the high-speed logic allows, in combination with external axis, the material processing on the fly and hence, processing of workpieces much larger than the scan field.

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