By Peter W. Hawkes (Ed.)
This quantity contains chapters discussing photo enhancement and propagation, and box behaviour in hugely anisotropic media. it truly is meant for researchers in optical technology, electric engineering, photograph processing and mechanical engineering.
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Extra resources for Advances in Imaging and Electron Physics, Vol. 92
DETAIL ENHANCEMENT Image analysis is a generic expression, mostly designating a variety of tasks to be carried out all at the same time. One of these tasks is the preservation or the enhancement of high spatial-frequency patterns-for instance, those representing human artifacts such as roads, channels, buildings, or urban settlements, embedded into a natural background in remote sensing views. However, a high spatial-frequency content is no peculiar feature of detail patterns, being shared with many natural textures.
The method of Chochia considers the current pixel p = ( x , y ) as the center of two windows, V and U C V , of different size, containing A4 and m pixels, respectively. , with m = 5 , is expected to be homogeneous, while V is considerably larger and can also contain several homogeneous regions. The background image pn(x,y) results, at the nth iteration, from a converging median filtering process. This filter performs an edge-preserving smoothing, as it averages f ( x , y) only with neighbors that are estimated to belong to the same region as (x, y), since their gray-value differences, with respect to f ( x , y), do not exceed a given threshold.
In one of these approaches Q is determined on the basis of the second-order statistics of the local gray-value distribution inside U,since the first-order statistics alone does not take account of the spatial relationships between gray values. With reference to Fig. 19a, let us consider the distribution of the absolute differences d(c, n) between the gray values of pixels A and B of U at a distance c and at an orientation of n n / 4 . The basic idea of this approach, supported by theoretical and empirical considerations, is to consider the degree of spatial order related to some kind of cluster separation measure in an opportune space, spanned by the features d(c, n), for various values of the parameters c and n.