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

By Peter W. Hawkes (ed.)

ISBN-10: 0120146673

ISBN-13: 9780120146673

This quantity comprises evaluation articles protecting a extensive variety of issues in photograph processing and research. the themes lined comprise photo research - which has united and harmonized a number of heterogeneous fabric; modern ways to the Fourier remodel; quantity theoretic transforms, that are quite beautiful for discrete, finite indications; using the Wigner distribution - which encodes either spatial and spectral details, for photograph filtering; and functions of the concept that of knowledge strength. those updated surveys are meant to supply the reader with entry to the newest leads to the super energetic box of photo technological know-how.

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

Example text

Subscripts F and D F as for Fig. 21. obtained after further error-reduction iterations, using the original visibility magnitudes, starting with the visibilty phases corresponding to Figs. 21a and 24a, respectively. In Fig. 26, the detail in the original image (Fig. 20) is apparent. The fog in Fig. 26 can be reduced further by employing several hybrid input-output iterations. The refogging tends to ensure that the reconstructed image-forms satisfy the positivity constraint. F. Consequences of Noninteger Oversampling When Image Box Is Known a Priori While the positivity constraint is essential for realistic phase retrieval in practice, some oversampling (as categorized by the symbol N introduced in Section ILC) of the visibility intensity is also usually neccessary.

13b and 13c in particular are palpably noisy by practical image-processing standards. A most encouraging aspect of Figs. 13a, 13b, and 13c is that the imageforms become less faithful only gradually as the noise level increases. There is a .................................... A = G S ......... I .......... 12. Plots of errors versus numberJ of iterations for the starfield with N = 2. ) . ,they have been normalized for convenience of display). 38 R. H. T. BATES AND D. 13. A. TWO-DIMENSIONAL PHASE PROBLEMS FIG.

1985), for instance. Figure 12b shows error plots for v = 2, obtained when the starfield is reconstructed with the aid of Fienup’s algorithms, starting with three different kinds of initial phase estimate. C, respectively. F. Consequences of Noisy Data Figures 13a, 13b, and 13c show the image-forms obtained, after the same number and types of iterations used to generate Fig. 9a, when the data are the ordinary and in-line structure factors of [ F,(u, u)[,as defined by Eq. 25, respectively, where the angular brackets denote an average over visibility space.

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


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