Download e-book for iPad: Advances in Imaging and Electron Physics, Vol. 92 by Peter W. Hawkes (Ed.)

By Peter W. Hawkes (Ed.)

ISBN-10: 0120147343

ISBN-13: 9780120147342

This quantity contains chapters discussing snapshot enhancement and propagation, and box behaviour in hugely anisotropic media. it's meant for researchers in optical technology, electric engineering, photograph processing and mechanical engineering.

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Additional info for Advances in Imaging and Electron Physics, Vol. 92

Example text

The operations to be performed for every pixel (x, y ) in order to compute the filter output u(x, y) can be summarized as follows: 1. Initialize: 2. First pass: Update: 3. Second pass: Mi = O , u‘(x, y ) = M2=0. P(X,Y ) 1 + a, Y) MI := MI + f ( x , y ) , M1 M2 M2 := M , + u’(x,y). - u(x, y ) = - u’(x, y). An example of the enhancement effects obtainable by means of the inverse contrast ratio mapping is shown in the upper half of Fig. 12. The original microscopic cell image at left has been processed with a 7 x 7 window, and the result is displayed at right.

If C; denotes the value of C’ 36 PIER0 ZAMPERONI after the tth processing iteration, the following polynomial expression and initialization values are used for deriving C; : C;+, = (1 - a)C; + a(C$ with C A = C, where a is a parameter between - 1 and 0. This causes the contrast enhancement to be weak when C is low, and strong when C is high. Moreover, Yu and Mitra (1993) also proposed other laws of dependence between C and C ’ , in which the relation C’ 2 C does not hold over the whole range of values of C, as is the case for the law C’ = C‘, but where there is an enhancement range (where C ’ 2 C ) , and a de-enhancement range (where C’ IC ) .

Let us consider the L x L observation window U,centered upon p(x,y ) and represented in Fig. , 4 . More generally, p,, can be considered as the , supposed to be uniform and affected by estimation of the gray value of U,, noise having a certain distribution. Although the optimum estimates differ , the average and the depending on the gray-value distribution inside U,, median Mu represent good estimates in several concrete cases. b a m-'2 2 2 0 2 2 2 Lpixel U FIGURE 16. (a) Observation window U and its one-dimensional subwindows U , , .

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Advances in Imaging and Electron Physics, Vol. 92 by Peter W. Hawkes (Ed.)


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