Download e-book for iPad: Advances in Electronics and Electron Physics, Vol. 67 by Peter W. Hawkes (ed.)

By Peter W. Hawkes (ed.)

ISBN-10: 0120146673

ISBN-13: 9780120146673

This quantity comprises assessment articles masking a huge diversity of issues in photograph processing and research. the subjects lined contain snapshot research - which has united and harmonized a number 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 info, for photo filtering; and functions of the concept that of data strength. those up to date surveys are meant to supply the reader with entry to the newest 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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We have previously argued (Bates and Fright, 1984, Section 12) that further improvement is 42 R. H. BATES AND D. 14. Preprocessing of noisy magnituide of starfields visibility. (a) I(u,u) = IF2(u,u)12; (b) IF,(u,v)l, which is that from which Fig. 3b was reconstructed; (c) Fourier transform of IF,(u,t1)1~,the bright square is the estimate of the autocorrelation box; (d) finally preprocessed version of I(#, u), compare with (a). TWO-DIMENSIONAL PHASE PROBLEMS FIG. 14 (continued) 43 44 R. H. T. BATES AND D.

The version obtained during the iteration completed just before the one presently being considered). The superscripts + and - ,respectively, identify those positive and negative parts of an image which are within B(x,y). , it comprises all pixels of B(x, y I N) not within B(x, y). The + 28 R. H. T. BATES A N D D. MNYAMA FIG. 7. Image-forms reconstructed by five Gerchberg-Saxton iterations, starting with direct pseudo-random initial phase estimates. (a) Puffin with N = 1, (b) starfield with N = 1, (c) puffin with N = 2, (d) starfield with N = 2.

8. (a) Puffin,(b) starfield. TWO-DIMENSIONAL PHASE PROBLEMS 33 FIG. 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.

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


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