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

By Peter W. Hawkes (Ed.)

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

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IMAGE ENHANCEMENT 33 FIGURE14. Example of a remote sensing view (upper left) processed with the extremum sharpening operator with various window sizes L . Upper right: L = 3; lower left: L = 7; lower right: three-level variant, with L = 11. ) spike with higher contrast in U (see Fig. 13a). As shown in Fig. 13b, monotone portions off(x, y ) of size greater than U,as for instance ramps or power or exponential functions, are just shifted by L / 2 pixel by the operator. , the degree of elimination of small details, grows with the window size L.

For larger window sizes, a spike remains unchanged only if there is no other b - f -- 4 -____- F : *A : __3 L=4 U LJJ I L FIGURE13. Effects of the extremum sharpening operator with various window sizes L upon some standard one-dimensional gray-value functions. Preservation and enhancement of small-size patterns (a), and of ramps (b). ) IMAGE ENHANCEMENT 33 FIGURE14. Example of a remote sensing view (upper left) processed with the extremum sharpening operator with various window sizes L . Upper right: L = 3; lower left: L = 7; lower right: three-level variant, with L = 11.

Determine c ( p k ) = g(pk)/B(pk). 38 PIER0 ZAMPERONI 3. Determine the enhanced contrast value c ’ ( p k ) as a function C’ = d(C) of C ( p k ) ,such that c i f C = 1, C’C i f C > 1. C’ = This can be realized, for instance, by means of the power function C’ = C‘, with r > 1 and real. 4. Obtain the enhanced gray value g’(pk)by using the inverse formula g’(pk) = C’(Pk) ’B(pk)* 5 . Repeat the same procedure for all the pixels pk of level Lk. One advantage of the pyramidal approach is that the intensity of the enhancement effect, which depends upon the value of the exponent r, can be made dependent on the pyramid level-for instance, it can be made stronger at the lower pyramid levels, where the finer detail is present, by taking r = 2(1 - k / K ) .

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