We propose a maximum a posteriori blind Poissonian images deconvolution approach with framelet regularization
for the image and total variation (TV) regularization for the point spread function. Compared with the TV based
methods, our algorithm not only suppresses noise effectively but also recovers edges and detailed information.
Moreover, the split Bregman method is exploited to solve the resulting minimization problem. Comparative results
on both simulated and real images are reported.
Abstract—In this paper, we present the adaptive bilateral filter
(ABF) for sharpness enhancement and noise removal. The ABF
sharpens an image by increasing the slope of the edges without producing
overshoot or undershoot. It is an approach to sharpness enhancement
that is fundamentally different from the unsharp mask
(USM). This new approach to slope restoration also differs significantly
from previous slope restoration algorithms in that the ABF
does not involve detection of edges or their orientation, or extraction
of edge profiles. In the ABF, the edge slope is enhanced by
transforming the histogram via a range filter with adaptive offset
and width. The ABF is able to smooth the noise, while enhancing
edges and textures in the image. The parameters of the ABF are
optimized with a training procedure. ABF restored images are significantly
sharper than those restored by the bilateral filter. Compared
with an USM based sharpening method—the optimal unsharp
mask (OUM), ABF restored edges are as sharp as those rendered
by the OUM, but without the halo artifacts that appear in
the OUM restored image. In terms of noise removal, ABF also outperforms
the bilateral filter and the OUM. We demonstrate that
ABF works well for both natural images and text images.
超分辨率图像复原是当今一个重要的热门研究课题.鉴于双边滤波优良的噪声抑制性和鲁棒的边缘保持性,提出一种双边滤波导出的广义MRF(Markov random field)图像先验模型.广义MRF模型不仅继承了双边滤波在阶数大邻域中的双重异性加权机制,且简洁地建立了双边滤波与Bayesian MAP(maximum a posterior)方法之间的理论联系.同时,由广义MRF模型导出了一种各向异性扩散PDE(partial differential equation)的改进数值解法.随后,在MRF-MAP框架下分别考虑高斯噪声和脉冲噪声两种情形,提出一种基于广义Huber-MRF模型的超分辨率复原算法,理论上保证具有严格全局最优解,并且利用半二次正则化思想和最速下降法求解相应的最小能量泛函.不论是视觉效果方面,还是峰值信噪比(PSNR)方面,实验结果都验证了广义Huber-MRF模型在超分辨图像复原中具有更强的噪声抑制性和边缘保持能力.
Product Description
This book introduces the geometry of 3-D vision, that is, the reconstruction of 3-D models of objects from a collection of 2-D images. It details the classic theory of two view geometry and shows that a more proper tool for studying the geometry of multiple views is the so-called rank consideration of the multiple view matrix. It also develops practical reconstruction algorithms and discusses possible extensions of the theory.
Review
From the reviews: "Computer vision is invading our daily lives … . Covering all the aspects would be too vast an area to cover in one book, so here, the authors concentrated on the specific goal of recovering the geometry of a 3D object … . The 22 pages of references form a good guide to the literature. The authors found an excellent balance between a thorough mathematical treatment and the applications themselves. … the text will be a pleasure to read for students … ." (Adhemar Bultheel, Bulletin of the Belgian Mathematical Society, Vol. 12 (2), 2005) "This is primarily a textbook of core principles, taking the reader from the most basic concepts of machine vision … to detailed applications, such as autonomous vehicle navigation. … It is a clearly written book … . Everything that is required is introduced … . an entirely self-contained work. … The book is aimed at graduate or advanced undergraduate students in electrical engineering, computer science, applied mathematics, or indeed anyone interested in machine vision … . is highly recommended." (D.E. Holmgren, The Photogrammetric Record, 2004) "This very interesting book is a great book teaching how to go from two-dimensional (2D)-images to three-dimensional (3D)-models of the geometry of a scene. … A good part of this book develops the foundations of an appropriate mathematical approach necessary for solving those difficult problems. … Exercises (drill exercises, advanced exercises and programming exercises) are provided at the end of each chapter." (Hans-Dietrich Hecker, Zentralblatt MATH, Vol. 1043 (18), 2004) "This book gives senior undergraduate and beginning graduate students and researchers in computer vision, applied mathematics, computer graphics, and robotics a self-contained introduction to the geometry of 3D vision. That is the reconstruction of 3D models of objects from a collection of 2D images. … Exercises are provided at the end of each chapter. Software for examples and algorithms are available on the author’s website." (Daniel Leitner, Simulation News Europe, Vol. 16 (1), 2006)
Well-posed, Ill-posed, and Intermediate Problems with Applications (Inverse & Ill-posed Problems) (Hardcover)
by Yu.P. Petrov (Author), V.S. Sizikov (Author)
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作者: Helmut Kopka / Patrick W. Daly
ISBN: 9780321173850
页数: 624
定价: $59.99
出版社: Addison-Wesley
出版年: 2003-12-05
简介 · · · · · ·
LaTeX is the text-preparation system of choice for scientists and academics, and is especially useful for typesetting technical materials. This popular book shows you how to begin using LaTeX to create high-quality documents. The book also serves as a handy reference for all LaTeX users. In this completely revised edition, the authors cover the LaTeX2ε standard and offer more d... LaTeX is the text-preparation system of choice for scientists and academics, and is especially useful for typesetting technical materials. This popular book shows you how to begin using LaTeX to create high-quality documents. The book also serves as a handy reference for all LaTeX users. In this completely revised edition, the authors cover the LaTeX2ε standard and offer more details, examples, exercises, tips, and tricks. They go beyond the core installation to describe the key contributed packages that have become essential to LaTeX processing.
Inside, you will find:
* Complete coverage of LaTeX fundamentals, including how to input text, symbols, and mathematics; how to produce lists and tables; how to include graphics and color; and how to organize and customize documents
* Discussion of more advanced concepts such as bibliographical databases and BIBTeX, math extensions with AMS-LaTeX, drawing, slides, and letters
* Helpful appendices on installation, error messages, creating packages, using LaTeX with HTML and XML, and fonts
* An extensive alphabetized listing of commands and their uses
New to this edition:
* More emphasis on LaTeX as a markup language that separates content and form--consistent with the essence of XML
* Detailed discussions of contributed packages alongside relevant standard topics
* In-depth information on PDF output, including extensive coverage of how to use the hyperref package to create links, bookmarks, and active buttons
As did the three best-selling editions that preceded it, Guide to LaTeX, Fourth Edition, will prove indispensable to anyone wishing to gain the benefits of LaTeX.
The accompanying CD-ROM is part of the TeX Live set distributed by TeX Users Groups, containing a full LaTeX installation for Windows, MacOSX, and Linux, as well as many extensions, including those discussed in the book.
作者简介 · · · · · ·
Helmut Kopka was previously a scientific staff member at the Max-Planck-Institut für Aeronomie in Germany. He was involved in writing one of the first TeX drivers for HP LaserJet and subsequently introduced TeX and LaTeX into his institute, where it has become the standard text-processing system for scientific publications.
Patrick W. Daly is a scientific staff member at the Max-Planck-Institut für Aeronomie in Germany. He has written formatting styles for several scientific journals and is the author of the natbib package for flexible bibliographic citations and of the custom-bib system for customizing bibliographic styles for use with BibTeX.
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ISBN:0321173856
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