By Peter W. Hawkes (ed.)
This quantity includes assessment articles overlaying a large variety of themes in snapshot processing and research. the themes coated contain photograph research - which has united and harmonized a bunch of heterogeneous fabric; modern methods to the Fourier remodel; quantity theoretic transforms, that are rather beautiful for discrete, finite indications; using the Wigner distribution - which encodes either spatial and spectral details, for picture filtering; and purposes of the idea that of data power. those updated surveys are meant to supply the reader with entry to the newest leads to the tremendous lively box of picture technology.
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Extra resources for Advances in Electronics and Electron Physics, Vol. 67
Bates and Fright, 1984; Fright, 1984). The image-form shown in 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.
32), we return to Eq. (29), thereby setting up an iterative loop which generates successive versions of $(x, y) and Y (u, v). C) as shown in Figs. 7a and 7b. But note that the starfield image would obviously benefit from more iterations (the black spots in Fig. 7b represent negative parts in the image). E) by oversampling by a factor of 2 (N = 2), as is illustrated in Figs. 7c and 7d. C. C). Note that the constraint on the phase function imposed in Eq. (35) only causes f(x, y), as defined by Eq.
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. G). B. n + Em,n = 2Em+1 / 2 4 (43) and Em,,+ 1 + Em9n= 2Em,n+1/2 (44) On writing Em+,,,+, - Am+p,n+vexp(i8,,,+,,,+,), where Am+C,n+v is positive and 8,,,+,,,+,is real, we deduce from Eqs.
Advances in Electronics and Electron Physics, Vol. 67 by Peter W. Hawkes (ed.)