Download e-book for kindle: 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 evaluate articles masking a large diversity of subject matters in picture processing and research. the themes lined comprise photo research - which has united and harmonized a bunch of heterogeneous fabric; modern methods 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 info, for snapshot filtering; and functions of the concept that of data strength. those updated surveys are meant to supply the reader with entry to the newest ends up in the tremendous energetic box of picture technology.

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Example text

23 which displays a fog over only part of the starfield. The fog is denser than that in Fig. 20, but its integrated amplitude is the same, so that it is appropriate to employ the same defogging window as that shown in Fig. 21b. Figures 24a and b show IF(u,O)( before and after defogging, respectively. Figures 25a and b show the image-forms obtained, after CPE followed by a single Fienup cycle (vl = 20, v 2 = 80, v 3 = lo), with and without defogging, respectively. Figure 25b is somewhat superior to Fig.

8b was reconstructed from 20 error reductions (vl = 20, v2 = 0, v 3 = 0) and Fig. 10b was obtained from a further 80 hybrid input-output iterations (vl = 20, v2 = 80, v3 = 0). Figure 19 shows the image-form obtained after a further 10 error reductions (vl = 20,v2 = 80,v3 = 10). Using error reduction to finish the Fienup cycling tend to reduce artifacts, as comparison of Figs. 10b and 19 confirms. Error reduction is guaranteed to converge (Fienup, 1982) and this convergence can be accelerated by using hybrid input-output.

21b), is shown in Fig. 21c. Figure 22a is the image-form obtained from the defogged visibility magnitude after CPE and one Fienup cycle (vl = 20, v 2 = 80, v 3 = 10). Figure 22b is the image-form obtained from the CPE and an identical Fienup cycle operating on the unfogged visibility magnitude. The superiority of Fig. 22a is obvious. R. H. T. BATES AND D. 20. Starfield with a smooth fog superimposed (this is called the foggy starfield). 21. Profiles through quantities in visibility space, along positive u axis.

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


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