Read e-book online 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 photograph enhancement and propagation, and box behaviour in hugely anisotropic media. it really is meant for researchers in optical technological know-how, electric engineering, picture processing and mechanical engineering.

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

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This section describes several nonlinear local contrast enhancement methods, which generally perform better than the linear ones, and yet do not require a higher computational complexity. A representative set of contrast enhancement methods has been tentatively chosen out of the vast literature on this subject, and these methods have been subdivided into classes characterized by typical approaches. However, a neat distinction between classes is not always possible. Similarly, it is sometimes not easy to distinguish, based only on the effects produced upon an image, between a contrast enhancement and a shading compensation method.

Considering the average gray value W in U,this variant performs a three-level quantization: otherwise. 34 PIER0 ZAMPERONI Fairfield (1990) developed an enhancement filter (the toboggan algorithm) which has the same aims as the extremum sharpening filter, but which follows another principle. Considering a 3 x 3 observation window, centered upon ( x , y ) , the filter output u(x,y) assumes the value f ( i ,j ) of that pixel ( i , j ) E U for which a measure of discontinuity d ( i , j ) is a minimum in U.

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. , a neatly written text on a white paper sheet), uniform scene illumination can be attained only under photographic studio conditions.

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


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