| 翻訳と辞書 |
| Ghost imaging ： ウィキペディア英語版 |
Ghost imaging
Ghost imaging (also called "coincidence imaging") is a technique that produces an image of an object by combining information from two light detectors: a conventional, ''multi-pixel'' detector that ''doesn't'' view the object, and ''single-pixel'' (bucket) detector that ''does'' view the object. Whether or not this technique requires quantum entanglement of photons for explanation is debated.〔('Ghost Imaging with a Single Detector' ) by Y.Bromberg, O.Katz and Y.Silberberg〕
== History ==
The first demonstrations of ghost imaging were based on the quantum nature of light. Specifically, quantum correlations between photon pairs were utilized to build up an image. One of the photons of the pair strikes the object and then the bucket detector while the other follows a different path to a (multi-pixel) camera. The camera is constructed to only record pixels from photons that hit both the bucket detector and the camera's image plane.
Later experiments indicated that the correlations between the light beam that hits the camera and the beam that hits the object may be explained by purely classical physics. If quantum correlations are present, the signal-to-noise ratio of the reconstructed image can be improved. In 2009 'pseudothermal ghost imaging' and 'ghost diffraction' were demonstrated by implementing the 'computational ghost-imaging' scheme,〔 which relaxed the need to evoke quantum correlations arguments for the pseudothermal source case.〔('Computational Ghost Imaging' ) by J.Shapiro〕 The exact role of quantum and classical correlations in ghost imaging is still controversial.
Recently, it was shown that the principles of 'Compressed-Sensing' can be directly utilized to reduce the number of measurements required for image reconstruction in ghost imaging.〔('Compressive Ghost Imaging' ) by O.Katz, Y.Bromberg and Y.Silberberg〕 This technique allows an N pixel image to be produced with far less than N measurements and may have applications in LIDAR and microscopy.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「Ghost imaging」の詳細全文を読む
スポンサード リンク
| 翻訳と辞書 : 翻訳のためのインターネットリソース |
Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.
|
|