High-speed cameras explore more details than normal cameras in the time sequence, while the conventional video sampling suffers from the trade-off between temporal and spatial resolutions due to the sensor’s physical limitation. Compressive sensing overcomes this obstacle by combining the sampling and compression procedures together. A single-pixel-based real-time video acquisition is proposed to record dynamic scenes, and a fast nonconvex algorithm for the nonconvex sorted ℓ1 regularization is applied to reconstruct frame differences using few numbers of measurements. Then, an edge-detection-based denoising method is employed to reduce the error in the frame difference image. The experimental results show that the proposed algorithm together with the single-pixel imaging system makes compressive video cameras available.
Mechanical instabilities and piezoresistivity of individual rolled-up SiGe/Si microtubes are investigated using
nanorobotic manipulation. By applying this technique, as-fabricated one-end-fixed SiGe/Si microtubes can be cut and
picked up from the substrate to examine their mechanical and electromechanical properties in a free space. Individual
SiGe/Si microtubes show typical Euler buckling when the uniaxial compressive load is larger than a critical value.
Moreover, experiments show that 1.6-turn rolled-up SiGe/Si microtubes have similar mechanical stability to ideal
seamless tubes though the former ones have a spiral-like cross sectional area instead of an ideal ring. According to the
measured I-V properties, SiGe/Si microtubes show positive piezoresistivity under compressive loads.
Conference Committee Involvement (2)
Optomechatronic Systems Control IV
20 November 2008 | San Diego, California, United States