Download 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 includes overview articles masking a wide diversity of themes in photo processing and research. the subjects coated contain picture research - which has united and harmonized a bunch of heterogeneous fabric; modern methods to the Fourier rework; quantity theoretic transforms, that are rather appealing for discrete, finite signs; using the Wigner distribution - which encodes either spatial and spectral details, for picture filtering; and functions of the idea that of knowledge power. those updated surveys are meant to supply the reader with entry to the newest leads to the tremendous lively box of photograph technology.

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Extra info for Advances in Electronics and Electron Physics, Vol. 67

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Hybrid inputoutput is known to approach a limit cycle after a while. This is why it is important to revert to error reduction to complete Fienup cycling. E . Defogging and Refogging It often happens that the given Z(u, u ) is dominated by a large central lobe, with the outer fringes being miniscule by comparison. Since it is these fringes which contain the information characterizing the image-form, the Fienup algorithms tend to converge very slowly (if at all) unless some ameliorative action is taken.

C). 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).

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. (a) Magnitude of visibility of foggy starfield; (b) defogging function, W(u,0); (c)defogged visibility magnitude. Subscripts F and DF stand for foggy and defogged, respectively. 22. Image-forms of foggy starfield obtained after a single Fienup cycle (v, = 20, lo), starting with CPE and using (a) defogged visibility magnitude (see Fig.

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