Blind ptychography
WebSep 21, 2016 · The blind photographer has a body, a mind, a purpose and/or a desire; the blind photographer spends life in complex relations to other people, sighted and blind, … WebOct 4, 2024 · Ptychography is a lensless imaging technique, which considers reconstruction from a set of far-field diffraction patterns obtained by illuminating small overlapping regions of the specimen. In many cases, a distribution of light inside the illuminated region is unknown and has to be estimated along with the object of interest. …
Blind ptychography
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WebFeb 11, 2024 · The ultra-high Fresnel number enables us to directly recover the positional shift of the diffuser in the phase retrieval process, addressing the positioning accuracy … WebJan 1, 2024 · First the ambiguities in general blind ptychography are shown to manifest in the form of block phase that can vary from one mask domain to another. Second, for both the lattice scheme and the ...
WebPtychography: software and technical developments Edited by Stefano Marchesini, David Shapiro and Filipe R. N. C. Maia. This virtual issue collects together a series of articles … WebMay 6, 2024 · Note that the coherent CDI problem (Thibault and Guizar-Sicairos 2012) can be interpreted as a special blind ptychography problem with only one scanned frame (J = 1). Fig. 1 Ptychographic PR (far field): A stack of phaseless data \(f_j:= \boldsymbol a^2_j\) is collected, with w being the localized coherent probe and u being the image of ...
WebFeb 26, 2024 · Ptychography with an unknown mask and object is analyzed for general ptychographic measurement schemes that are strongly connected and possess an anchor. Under a mild constraint on the mask phase, it is proved that the masked object estimate must be the product of a block phase factor and the true masked object. WebFeb 26, 2024 · Ptychography with an unknown mask and object is analyzed for general ptychographic measurement schemes that are strongly connected and possess an …
WebJun 6, 2024 · Abstract: Ptychography with an unknown mask and object is analyzed for general ptychographic measurement schemes that are strongly connected and possess …
WebOct 1, 2024 · Ptychography with an unknown probe and object is analyzed for the raster scan scheme. The block phases are shown to form an arithmetic progression and the complete characterization of the raster scan ambiguities is given, including: First, the periodic raster grid pathology of degrees of freedom proportional to the squared stepsize … connect samsung tablet to pc dexWebPtychography is an enabling coherent diffraction imaging technique for both fundamental and applied sciences. Its applications in optical microscopy, however, fall short for its low … edinburg public worksWebAug 26, 2024 · Blind ptychography is the scanning version of coherent diffractive imaging which seeks to recover both the object and the probe are simultaneously. Concrete examples of ambiguity in blind ptychography are presented to illustrate the challenge of blind ptychography. Two opposing classes of measurement schemes are discussed: … edinburg raceway parkWebinherent to any blind ptychography. However, when the mask is exactly known (i.e. 0= up to a constant phase factor), r = 0 and c= 1 so neither ambiguity can occur. In addition, for the regular raster scan (Fig. 1), it is well known that blind ptychography is susceptible to many other artifacts [51]. For a complete analysis of these ambiguities, the edinburg pump stationWebFeb 11, 2024 · In our implementation, we use a low-cost, DIY scanning stage to perform blind diffuser modulation. Precise mechanical scanning that is critical in conventional ptychography experiments is no longer needed in our setup. We further employ an up-sampling phase retrieval scheme to bypass the resolution limit set by the imager pixel … edinburg raceway eventsedinburg public schoolWebA tag already exists with the provided branch name. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. edinburg public records