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

By Peter W. Hawkes (Ed.)

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

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Extra resources for Advances in Imaging and Electron Physics, Vol. 92

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19d, and not only the line-shaped ones, as for instance pattern a of the same figure. For this aim, it is necessary to define opportunately a “degree of local spatial order” Q, with 0 5 Q 5 1, to be formally substituted for a in the preceding formula giving the rank r of the selected filter output f(r). 46 PIER0 ZAMPERONI FIOURE18. Examples of the application of adaptive extremum sharpening filters to the remote sensing view of an urban area (upper left) and to an infrared image of a street scene (lower left).

Their smoothing effect depends only upon the choice of one parameter, and it can be made 22 PIER0 ZAMPERONI equivalent to that of a nonrecursive filter with a very large window, while the computation time is very low and independent of the intensity of smoothing. Beside the linear approaches, there are nonlinear techniques aiming at the extraction of a background image b(x,y ) which should be more suitable for yielding the shading function to be subtracted. Some of them will be described in the following.

Another compromise approach for determining the background shading by linewise image averaging has been proposed by Dapoigny et al. (1991). The length n of the one-dimensional smoothing n x 1 filter can be adaptively optimized dependent on the line contents. Much faster smoothing filters for computing the background image b(x,y) can be realized by using the recursive technique proposed by Deriche (1990). The implementation of these recursive filters is rather complex, and it requires a number of auxiliary image memories.

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