New PDF release: Advances in Electronics and Electron Physics, Vol. 67

By Peter W. Hawkes (ed.)

ISBN-10: 0120146673

ISBN-13: 9780120146673

This quantity includes assessment articles overlaying a wide variety of issues in photograph processing and research. the themes coated contain photograph research - which has united and harmonized a bunch of heterogeneous fabric; modern techniques to the Fourier remodel; quantity theoretic transforms, that are quite appealing for discrete, finite signs; using the Wigner distribution - which encodes either spatial and spectral details, for snapshot filtering; and functions of the concept that of data power. those up to date surveys are meant to supply the reader with entry to the newest ends up in the tremendous lively box of snapshot technological know-how.

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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.

C. D, respectively. D presents histories of the numerical convergence of several reconstructed image-forms. D should give the reader a clear indication of the computational implications of the iterative algorithms. F. fm,n (mA1, 22 R. H. T. BATES AND D. MNYAMA FIG. 5. Images formed from zero-phase visibilities. Notethat images(c)and(d)are transformsof (a)JF,(u,u)~;(b)~F,(u,u)~;(c) the autocorrelations of the puffin and starfield, respectively. 5 (continued) 23 24 R. H. T. BATES AND D. MNYAMA A.

Comparison of Figs. 3 and 4 emphasizes why exceedingly strong constraints are necessary. For instance, the only possible hint of Fig. 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.

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


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