Single-shot tomographic movies of evolving light-velocity objects

Single-shot tomographic movies of evolving light-velocity objects

Tomography--cross-sectional imaging based on measuring radiation transmitted through an object along different directions--enables non-invasive imaging of hidden stationary objects, such as internal bodily organs, from their sequentially measured projections. Here we adapt tomographic methods to visualize--in one laser shot--the instantaneous structure and evolution of a laser-induced object pr...

Single-shot Doppler Velocity Estimation using double chirp pulse compression

Coherent ultrasonic Doppler velocimeters provide precise and accurate measurements of velocity profiles in many applications. However, these instruments suffer from the well known range-velocity ambiguity, making this kind of instruments not well suited for velocity measurements in channels of several meters depth and water velocities of some meters per second. On the other side, incoherent ult...

The evolving perception of controversial movies

Polarization of opinion is an important feature of public debate on political, social and cultural topics. The availability of large internet databases of users’ ratings has permitted quantitative analysis of polarization trends—for instance, previous studies have included analyses of controversial topics on Wikipedia, as well as the relationship between online reviews and a product’s perceived...

Coding-free Structured Light Means for Single-shot 3D Reconstruction

Integral holography: white-light single-shot hologram acquisition.

A new method for obtaining digital Fourier holograms, under spatially incoherent white-light illumination and in a single camera shot, is presented. Multiple projections of the 3-D scene are created in the image plane of a microlens array, and a digital camera acquires the entire projections in a single shot. Then, each projection is computer processed to yield a single point in a Fourier holog...