By Peter W. Hawkes (Ed.)
This quantity comprises chapters discussing snapshot enhancement and propagation, and box behaviour in hugely anisotropic media. it's meant for researchers in optical technological know-how, electric engineering, snapshot processing and mechanical engineering.
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Additional resources for Advances in Imaging and Electron Physics, Vol. 92
Since Mz can be determined only after the image filtering scan, a second scan is necessary for the final scaling. 31 IMAGE ENHANCEMENT The window size L represents a user parameter that determines the intensity of the enhancement effect. 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).
The size of U plays a decisive role as far as the intensity of contrast enhancement is concerned. For each window position for which f ( x , y) is equal either tofC,, 28 PIER0 ZAMPERONI or to f&, u(x, y) is equal to 0 or to G - 1 , respectively. ,N are equally distributed, independently of the local gray-value distribution, the probability (equal to 2/N) of u(x, y) being identical to a local extremum grows with decreasing window size. Asymptotically, for a 2 x 1 window, one would obtain a binarized image, characterized by a maximum of local contrast.
4 , considered in multistage filters. , T ) containing the current pixel p , which can be inscribed in an L x L window. Two subwindows, for t = 2 (0)and for t = 9 (0). are shown. , 41 are superior from several points of view: The median is a robust estimator in presence of outliers. In fact, if p lies on a thin line, all the subwindows U, not lying in the line direction feature a uniform distribution with a strong outlier: the line pixel p . It is easier than in the two-dimensional case to discriminate between line segments (to be preserved) and short strokes (to be suppressed) on the basis of their length, and to choose the proper window size for this.