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

By Peter W. Hawkes (ed.)

ISBN-10: 0120146673

ISBN-13: 9780120146673

This quantity comprises assessment articles overlaying a wide diversity of subject matters in photo processing and research. the themes lined comprise picture research - which has united and harmonized a number of heterogeneous fabric; modern ways to the Fourier remodel; quantity theoretic transforms, that are rather appealing for discrete, finite signs; using the Wigner distribution - which encodes either spatial and spectral info, for photograph filtering; and purposes 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 snapshot technology.

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

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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. 13 (continued) 39 40 R H. 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.

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. The noise was independent between structure factors and was uniformly distributed between its extreme negative and positive values. , those far from the origin of visibility space) of F(u,u) are comparatively small, their signal-to-noise ratios are effectively lower.

Note that the constraint on the phase function imposed in Eq. (35) only causes f(x, y), as defined by Eq. (29),to be real, For it to be positive, as well as real, ul(u,v) must be the actual phase function that we are seeking. So, it is necessary to find some iterative procedure for generatin-g this phase function. , 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).

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

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