Talk:Digital holography
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There seems to be a misconception here. From the literature, I have collected that Digital Holography refers to the definiton which I have given in the first paragraph - the digital recording and processing of holographic measurement data. Ultimately, the goal is to obtain information on the object of investigation.
The "numerical (or digital) synthesis of holograms" which is alluded to in a large portion of the text has just the opposite intention: To generate a realistic aspect including depth perception of a completely virtual object. In fact, this is the subject of computer generated holography (CGH), which has its own article in Wikipedia, for good reason. It is, in my opinion, confusing to mix CGH and Digital Holography.
Suggestion: Remove parts about synthesis and join into CGH page.
Confusion about the meaning of 'Digital Holography'
[edit]Some of the article suggests that digital holgraphy refers to digital analysis of holograms, but other parts say that it refers to the generation of holgrams using computers, and is the same as computer generatedI find this whole page very confusing.
The abstract from the book 'Digital Holography' which is the first refernce given suggests the latter:
"This book presents a self-contained treatment of the principles and major applications of digital hologram recording and numerical reconstruction (Digital Holography). The first part deals with optical foundations and the theory of holography. The next section describes how to record holograms directly with an electronic sensor (CCD) and describes the various reconstruction techniques. A special chapter is designated to digital holographic interferometry with applications in deformation and shape measurement and refractive index determination. Applications in imaging and microscopy are also described. The next part discusses special techniques such as digital light-in-flight holography, holographic endoscopy, information encrypting and comparative holography. In the last chapter related techniques of speckle metrology are treated briefly."
This needs to be clarified by an expert.Epzcaw (talk) 19:41, 9 May 2008 (UTC)
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[edit]The 'convention' now seems to be: computer-generated holograms (CGH) refers to the process of numerically calculating and printing the hologram followed by optical reconstruction by shining laser on it. On the other hand, digital holography (DH) refers to the opposite process where the hologram is generated optically by shining laser on an object and the hologram is recorded electronically using a ccd camera. The reconstruction is done numerically inside a computer. In both the CGH and DH, the numerical calculation of the hologram is carried out using the basic theory of propagation of electromagnetic wave, which includes light. Bbokki (talk) 04:25, 31 July 2008 (UTC)
A Commons file used on this page has been nominated for deletion
[edit]The following Wikimedia Commons file used on this page has been nominated for deletion:
i have made the measurement of this digital hologram, as described here : https://arxiv.org/pdf/1401.5342.pdf why would you delete it?
Participate in the deletion discussion at the nomination page. —Community Tech bot (talk) 21:36, 13 May 2019 (UTC)
