Schemes for recording and reconstruction of relief-phase reflection holograms providing virtually aberration-free imaging of the structure of two-dimensional objects were developed and substantiated. Samples of relief-phase reflection holograms forming a speckle-free image of a photolithographic test pattern ...
Spatial coherence in imaging has one notorious consequence: speckle. Itcorrupts images and limits laser use in applications ranging from modern microscopyto digital light projectors to photolithography. Most approaches for eliminatingspeckle involve time-averaging independent speckle patterns, which limits the...
(redirected fromSpeckle imaging) Encyclopedia Wikipedia speckle interferometry n (Astronomy)astronomya technique to increase the angular resolution of telescopes that are impaired by atmospheric turbulence, in which the information from a number of exposures of very short duration is combined ...
The reproducibility of the speckle-free holographic displays is an important issue due to the sensitiveness of the coherent imaging. Peng et al. and Chakravarthula et al. deal with the speckle noise generated in the mismatch between the ideal and the actual wave propagation and summarizing the ...
there could be a future where the holographic displays look even more like real life. In their own pursuit of these better displays, the Stanford Computational Imaging Lab has combined their expertise in optics and artificial intelligence. Their most recent advances in this area are detailed in a...
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For many applications — such as those in the automotive assembly, packaging, and electronics industries — the question of 2D versus 3D imaging for machine vision has focused on the cost and complexity of 3D. Systems integrators and designers may prefer 3D height data over 2D data, however, ...
This retrospective study was designed to explore the relationship between right ventricular fibroblast activation measured by fibroblast activation protein inhibitor (FAPI) imaging and myocardial deformation measured by Speckle‑tracking Echocardiography (STE) in patients with pulmonary hypertension (PH). Metho...
et al. Low spatial coherence electrically pumped semiconductor laser for speckle-free full-field imaging. PNAS 112, 1304–1309 (2015). ADS CAS PubMed Google Scholar Roorda, A. et al. What can adaptive optics do for a scanning laser ophthalmoscope? Bull. Soc. belge Ophtalmol. 302, 231–...
While powerful, speckle-based imaging has its inherent downsides or pitfalls, similar to every imaging modality. The first common downside is that speckle-based imaging is insensitive to high-frequency features, but this can be partially improved by removing the effect of free-space propagation from...