William K. Pratt

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he second edition of Pratt’s Digital Image rocessing has been a well-thumbed memer of the reviewer’s library for a number f years. As the author states in the preface o the fourth edition, this book is an “inustrial strength” introduction to digital mage processing. Collected in one place re discussions of most image processing opics, complete with(More)
Let the pixel array f(j, k) represent a sample of a random process with zero mean represented in two's complement format over an integer range -M ~ f(j, k) ~ (M 1). The probability density of the cosine transform coefficients F(u, v) has been modeled by a number of functions [3], [ 12]. Among them, the Laplacian density has been shown to provide the best(More)
This paper presents the development and evaluation of a visual texture feature extraction method based on a stochastic field model of texture. Results of recent visual texture discrimination experiments are reviewed in order to establish necessary and sufficient conditions for texture features that are in agreement with human discrimination. A texture(More)
The classical signal processing technique known as Wiener filtering has been extended to the processing of oneand two-dimensional discrete data by digital operations with emphasis on reduction of the computational requirements. In the generalized Wiener filtering process a unitary transformation, such as the discrete Fourier, Hadamard, or Karhunen-Loeve(More)
OBJECTIVE The authors' goal was to determine whether dynamic categorization, a new technique for organizing search results, is more useful than the two existing organizational techniques: relevance ranking and clustering. They define a useful tool as one that helps users learn about the kinds of information that pertain to their query, find answers to their(More)
The acquisition, processing, and use of three-dimensional (3D) imaging provide new insights into normal and abnormal craniofacial anatomy. In this article, characteristics of CT and MRI scanning are reviewed along with the methods used to delineate tissues and produce 3D patient displays, including contouring, shaded surface, and volumetric processing. The(More)
This paper present a Improved Algorithm for Image Segmentation System for a RGB colour image, and presents a proposed efficient colour image segmentation algorithm based on evolutionary approach i. e. improved Genetic algorithm. The proposed technique, without any predefined parameters determines the optimum number of clusters for colour images. The optimal(More)