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 overview articles overlaying a extensive diversity of issues in photograph processing and research. the subjects coated contain photo research - which has united and harmonized a number of heterogeneous fabric; modern methods to the Fourier rework; quantity theoretic transforms, that are really appealing for discrete, finite indications; using the Wigner distribution - which encodes either spatial and spectral details, for snapshot filtering; and functions of the idea that of knowledge power. those updated surveys are meant to supply the reader with entry to the most recent leads to the tremendous lively box of photo technological know-how.

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T. BATES AND D. MNYAMA no sudden, catastrophic deterioration such as usually occurs, for instance, when one attempts extrapolation in the presence of noise. , 1984),does of course greatly enhance the practical significance of Fourier phase retrieval algorithms. A how the effects of noise can be ameliorated in part by preprocessing, thereby permitting the reconstruction of image-forms more faithful than those shown in Figs. 13a, 13b, and 13c. Figure 13d shows the improvement on Fig. A are invoked.

10. Further improvement of image-forms obtained after an additional 50 Fienup hybrid input-output iterations, starting from Fig. 9. (a) Puffin, (b) starfield. 1 I. Profiles (plotted logarithmically)through magnitudes of visibilities of puffin and starfield. (a) (F,(u,O)(;(b) 1F,(O, u)l; (c) IF2(u,0)I;(d) IF2(0,u)l. Note that the fringe frequency in (a) and (b) is greater than in (c) and (d). by E - ( v )and defined by (37) B(x. Y I N) where v can be any positive number, but is usually set equal to 1 (defines the magnitude error) or 2 (defines the intensity error).

A) both visibilities of the same image-form, we are permitted to choose 81,0to be the positive arccosine of the right-hand side of Eq. (45) when rn = n = 0: (48) Figure 15 is a phasor diagram on which both 80,0 and 81,0are shown (for a particular value of the latter). Setting m = n = 0 in Eq. (46) we obtain, with the aid of Eq. 1 A0,01 (49) The two possible values of 80,1are represented (for particular structure factor magnitudes) by the cross-hatched lines on Fig. 15. Setting m = 0 and n = 1 in Eq.

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

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