Download Advances in Electronics and Electron Physics, Vol. 67 by Peter W. Hawkes (ed.) PDF

By Peter W. Hawkes (ed.)

This quantity includes assessment articles protecting a huge diversity of themes in picture processing and research. the themes lined comprise photograph research - which has united and harmonized a bunch of heterogeneous fabric; modern methods to the Fourier rework; quantity theoretic transforms, that are relatively beautiful for discrete, finite signs; using the Wigner distribution - which encodes either spatial and spectral details, for photo filtering; and purposes of the idea that of knowledge power. those up to date surveys are meant to supply the reader with entry to the most recent leads to the tremendous energetic box of snapshot technology.

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Extra resources for Advances in Electronics and Electron Physics, Vol. 67

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17b is obvious. The above iterative scheme suffers from the defect that it makes no use of the given in-between structure factor magnitudes of F(u,_v) once the initial CPE is generated. There is then nothing to prevent the f(x,y) from which Z(x, y) is formed from departing more and more from the true image-form at each iteration. 01. G. Won et al. (1985) suggest other related means of improving the CPE and demonstrate them by example. Since their performance seems to be inferior to that of the approach described here, we neglect them in this review.

3b apparent in Fig. 4b is found in the fuzzy background. We must somehow contrive to transform this background into Fig. 3b, simultaneously obliterating the version of Fig. 3a which dominates Fig. 4b. C, have the power to effect such transformations. It is all very remarkable and is certainly not completely understood as yet. Since positivity is clearly so important for practical phase retrieval, we summarize in Table 111 those physical situations in which positive images occur. IV. ITERATIVEPHASEREFINEMENT Having dealt with the preliminaries, we are now in a position to illustrate the power of existing phase retrieval algorithms.

The resolution in the image plane is usually poorer than in the diffraction plane. 3 nm in the diffraction plane (Misell, 1978). B). Having 26 R. H. T. BATES AND D. 6 . Images obtained from puffin's visibility magnitude, IFl(#, u)l, combined with (a) direct pseudo-random phase, (b) indirect pseudo-random phase. A, and having computed r(x, y) as prescribed by Eq. (29),the image phase function r$(x, y) is defined by w , Y ) = Phasemx, Y)> (33) This is then combined with the given image magnitude If(x,y)l to give h Y ) = If(x,y)I exP[i&x9Y)l (34) On computing P(u, v), as prescribed by Eq.

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