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

By Peter W. Hawkes (Ed.)

ISBN-10: 0120147343

ISBN-13: 9780120147342

This quantity contains chapters discussing snapshot 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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Additional info for Advances in Imaging and Electron Physics, Vol. 92

Sample text

The streak direction can be brought to coincide with the horizontal or with the vertical axis. Many streak suppression methods, including the one described here, can be considered as variants of the box-filtering technique (McDonnell, 1981). For better matching the streak structure, let us choose a rectangular m x n observation window U,centered on the current pixel ( x , y ) . Assuming horizontal streaks, n should be chosen to be sensibly greater than the streak width, while m should be equal to the estimated shortest streak segment between gaps.

Later, Lester et al. (1980) used it in the enhancement of biomedical images for diagnostic purposes. The extremum sharpening can be considered as a local binarization: The operator output u(x, y ) assumes either the value of the local maximum f ( N ) or that of the local minimumf(,, in the N-pixel observation window U, depending upon which one of these values lies closer to the gray value of the current pixel f(x, y). The floating binarization threshold is implicitly set at V ( N ) + f(l))/2: The effects of the extremum sharpening upon a one-dimensional gray-value function are illustrated qualitatively in Fig.

A. Hktogram Stretching with Shape Preservation. ,N, with hi)5 f(i+l). If f ( x , y) is the current gray value and u(x, y) the filter’s result, the transformation otherwise, linearly stretches the local histogram without altering its shape, except for the gaps between the histogram bins caused by the stretching. 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.

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


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