By Peter W. Hawkes (Ed.)
This quantity contains chapters discussing snapshot enhancement and propagation, and box behaviour in hugely anisotropic media. it really is meant for researchers in optical technology, electric engineering, snapshot processing and mechanical engineering.
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Additional info for Advances in Imaging and Electron Physics, Vol. 92
SHADINGCOMPENSATION a. Definition of the Problem. An image can be impaired by a background intensity function (shading), superimposed on the useful image contents information, and containing only very low spatial frequency components. The origin of the shading can be manifold: The sensitivity of the imaging device is not uniform over the whole image field. In particular, the response of the optical system is often stronger at the center than at the border. This induces a dome-shaped background shading.
If any subwindow contains a bright line IMAGE ENHANCEMENT 43 (or a stroke) of at least Q pixel length (Q < L ) , this line will be preserved by assigning to the parameter r the value L - Q + 1. In this case, both Max = f& , for one of the values of a, and f ( x ,y ) are equal to 1, and the majority count of the second stage yields u(x,y) = 1. Similar considerations hold for the dark line case. In this way the parameter r can be used for controlling the filter’s sieving behavior with respect to short segments.
With rank r (1 Ir IL ) is extracted from the L - 1 rank-ordered gray values I... , from the subwindow Ua without the current pixel p , which, being common to all the Uu’s,can be neglected. Thus, the ordinary multistage median filter is just a particular case of the general one, for r = (L - 1)/2. Except for substituting the median with the general rank r, the first and the second stage are analogous to the ordinary multistage median filter. 4 [f(r)u). The filter properties with respect to the preservation or deletion of linear strikes of given length can be controlled through the choice of the user parameter r in the following way.
Advances in Imaging and Electron Physics, Vol. 92 by Peter W. Hawkes (Ed.)