Download or read book Contrast Enhancement for Tone mapped High Dynamic Range Images written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: HKUST Call Number: Thesis ECED 2009 Yip.

Download or read book Tone Mapping Operators for High Dynamic Range Images written by Ba chien Thai and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: He conversion of High Dynamic Range (HDR) image into Low Dynamic Range (LDR) image is investigated so that the visual rendering of the latter is of good quality. The first contribution focused on the contrast enhancement of the tone mapped image using a piecewise linear function as a non-uniform histogram equalization adjustment to mode! the "s-shaped" curve of the human visual adaptation. The second and third contributions are concerned with the details preservation of the HDR image on the tone mapped image. Separable and non-separable multiresolution approaches based on essential non-oscillatory strategies, taking into account the HDR image singularities in the mathematical mode! derivation, are proposed. The fourth contribution not only preserves details but also enhances the contrast of the HDR tone mapped image. A separable "near optimal" lifting scheme using an adaptive powerful prediction step is proposed. The latter relies on a linear weighted combination depending on the neighbouring coefficients to extract the relevant fin est details on the HDR image at each resolution level. A piecewise linear mapping is then applied on the coarse reconstruction. Simulation results provide good performance, both in terms of visual quality and Tone Mapped Quality Index (TMQI) metric, compared to existing competitive tone mapping approaches. The impact of the TMQI parameters on the visual quality of the tone mapped images is discussed. The proposed parameters show a strong correlation between the modified metric and.

Download or read book High Dynamic Range Imaging written by Erik Reinhard and published by Morgan Kaufmann. This book was released on 2010-05-28 with total page 673 pages. Available in PDF, EPUB and Kindle. Book excerpt: High Dynamic Range Imaging, Second Edition, is an essential resource for anyone working with images, whether it is for computer graphics, film, video, photography, or lighting design. It describes HDRI technology in its entirety and covers a wide-range of topics, from capture devices to tone reproduction and image-based lighting. The techniques described enable students to produce images that have a dynamic range much closer to that found in the real world, leading to an unparalleled visual experience. This revised edition includes new chapters on High Dynamic Range Video Encoding, High Dynamic Range Image Encoding, and High Dynamic Range Display Devices. All existing chapters have been updated to reflect the current state-of-the-art technology. As both an introduction to the field and an authoritative technical reference, this book is essential for anyone working with images, whether in computer graphics, film, video, photography, or lighting design. - New material includes chapters on High Dynamic Range Video Encoding, High Dynamic Range Image Encoding, and High Dynammic Range Display Devices - Written by the inventors and initial implementors of High Dynamic Range Imaging - Covers the basic concepts (including just enough about human vision to explain why HDR images are necessary), image capture, image encoding, file formats, display techniques, tone mapping for lower dynamic range display, and the use of HDR images and calculations in 3D rendering - Range and depth of coverage is good for the knowledgeable researcher as well as those who are just starting to learn about High Dynamic Range imaging - The prior edition of this book included a DVD-ROM. Files from the DVD-ROM can be accessed at: http://www.erikreinhard.com/hdr_2nd/index.html

Download or read book Objective Quality Assessment and Optimization for High Dynamic Range Image Tone Mapping written by Kede Ma and published by . This book was released on 2014 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: Tone mapping operators aim to compress high dynamic range (HDR) images to low dynamic range ones so as to visualize HDR images on standard displays. Most existing works were demonstrated on specific examples without being thoroughly tested on well-established and subject-validated image quality assessment models. A recent tone mapped image quality index (TMQI) made the first attempt on objective quality assessment of tone mapped images. TMQI consists of two fundamental building blocks: structural fidelity and statistical naturalness. In this thesis, we propose an enhanced tone mapped image quality index (eTMQI) by 1) constructing an improved nonlinear mapping function to better account for the local contrast visibility of HDR images and 2) developing an image dependent statistical naturalness model to quantify the unnaturalness of tone mapped images based on a subjective study. Experiments show that the modified structural fidelity and statistical naturalness terms in eTMQI better correlate with subjective quality evaluations. Furthermore, we propose an iterative optimization algorithm for tone mapping. The advantages of this algorithm are twofold: 1) eTMQI and TMQI can be compared in a more straightforward way; 2) better quality tone mapped images can be automatically generated by using eTMQI as the optimization goal. Numerical and subjective experiments demonstrate that eTMQI is a superior objective quality assessment metric for tone mapped images and consistently outperforms TMQI.

Download or read book High Dynamic Range Video written by Frédéric Dufaux and published by Academic Press. This book was released on 2016-04-27 with total page 631 pages. Available in PDF, EPUB and Kindle. Book excerpt: At the time of rapid technological progress and uptake of High Dynamic Range (HDR) video content in numerous sectors, this book provides an overview of the key supporting technologies, discusses the effectiveness of various techniques, reviews the initial standardization efforts and explores new research directions in all aspects involved in HDR video systems. Topics addressed include content acquisition and production, tone mapping and inverse tone mapping operators, coding, quality of experience, and display technologies. This book also explores a number of applications using HDR video technologies in the automotive industry, medical imaging, spacecraft imaging, driving simulation and watermarking. By covering general to advanced topics, along with a broad and deep analysis, this book is suitable for both the researcher new or familiar to the area. With this book the reader will: - Gain a broad understanding of all the elements in the HDR video processing chain - Learn the most recent results of ongoing research - Understand the challenges and perspectives for HDR video technologies - Covers a broad range of topics encompassing the whole processing chain in HDR video systems, from acquisition to display - Provides a comprehensive overview of this fast emerging topic - Presents upcoming applications taking advantages of HDR

Download or read book High Dynamic Range Video written by Karol Myszkowski and published by Springer Nature. This book was released on 2022-05-31 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: As new displays and cameras offer enhanced color capabilities, there is a need to extend the precision of digital content. High Dynamic Range (HDR) imaging encodes images and video with higher than normal 8 bit-per-color-channel precision, enabling representation of the complete color gamut and the full visible range of luminance.However, to realize transition from the traditional toHDRimaging, it is necessary to develop imaging algorithms that work with the high-precision data. Tomake such algorithms effective and feasible in practice, it is necessary to take advantage of the limitations of the human visual system by aligning the data shortcomings to those of the human eye, thus limiting storage and processing precision. Therefore, human visual perception is the key component of the solutions we discuss in this book. This book presents a complete pipeline forHDR image and video processing fromacquisition, through compression and quality evaluation, to display. At the HDR image and video acquisition stage specialized HDR sensors or multi-exposure techniques suitable for traditional cameras are discussed. Then, we present a practical solution for pixel values calibration in terms of photometric or radiometric quantities, which are required in some technically oriented applications. Also, we cover the problem of efficient image and video compression and encoding either for storage or transmission purposes, including the aspect of backward compatibility with existing formats. Finally, we review existing HDR display technologies and the associated problems of image contrast and brightness adjustment. For this purpose tone mapping is employed to accommodate HDR content to LDR devices. Conversely, the so-called inverse tone mapping is required to upgrade LDR content for displaying on HDR devices. We overview HDR-enabled image and video quality metrics, which are needed to verify algorithms at all stages of the pipeline. Additionally, we cover successful examples of the HDR technology applications, in particular, in computer graphics and computer vision. The goal of this book is to present all discussed components of the HDR pipeline with the main focus on video. For some pipeline stages HDR video solutions are either not well established or do not exist at all, in which case we describe techniques for single HDR images. In such cases we attempt to select the techniques, which can be extended into temporal domain. Whenever needed, relevant background information on human perception is given, which enables better understanding of the design choices behind the discussed algorithms and HDR equipment. Table of Contents: Introduction / Representation of an HDR Image / HDR Image and Video Acquisition / HDR Image Quality / HDR Image, Video, and Texture Compression / Tone Reproduction / HDR Display Devices / LDR2HDR: Recovering Dynamic Range in Legacy Content / HDRI in Computer Graphics / Software

Download or read book Vision Models for High Dynamic Range and Wide Colour Gamut Imaging written by Marcelo Bertalmío and published by Academic Press. This book was released on 2019-11-06 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt: To enhance the overall viewing experience (for cinema, TV, games, AR/VR) the media industry is continuously striving to improve image quality. Currently the emphasis is on High Dynamic Range (HDR) and Wide Colour Gamut (WCG) technologies, which yield images with greater contrast and more vivid colours. The uptake of these technologies, however, has been hampered by the significant challenge of understanding the science behind visual perception. Vision Models for High Dynamic Range and Wide Colour Gamut Imaging provides university researchers and graduate students in computer science, computer engineering, vision science, as well as industry R&D engineers, an insight into the science and methods for HDR and WCG. It presents the underlying principles and latest practical methods in a detailed and accessible way, highlighting how the use of vision models is a key element of all state-of-the-art methods for these emerging technologies. - Presents the underlying vision science principles and models that are essential to the emerging technologies of HDR and WCG - Explores state-of-the-art techniques for tone and gamut mapping - Discusses open challenges and future directions of HDR and WCG research

Download or read book Complete Guide to High Dynamic Range Digital Photography written by Ferrell McCollough and published by Lark Books. This book was released on 2008 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: It s the latest and hottest technique, made possible only through digital. High Dynamic Range photography is the process of taking several pictures of a scene at various exposures, then merging them into one file. So the entire photo can look crisp and detailed, from highlights to midtones to shadowsand photographers needn t sacrifice any part of their image. And the best way to master this exciting technology is with this thorough, easy-to-follow, and visually spectacular guide. No other title does justice to these cutting-edge techniques, which actually take the viewer into worlds far beyond normal photographysometimes even beyond normal human perception. Ferrell McCollough, a widely respected photographer, pushes the boundaries and inspires others to pursue their artistic vision, too. The amazing results simply can t be achieved any other way. "

Download or read book High dynamic range Digital Photography written by Jiangtao Kuang and published by . This book was released on 2007 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Current desktop and hard copy display media are capable of only a limited dynamic range in luminance. Hence, high dynamic range (HDR) images require tone-mapping operators for rendering on these media to adequately reproduce their perceptual qualities. Furthermore, the development of these operators requires a methodology for their evaluation in terms of perceptual attributes. To this end, a series of psychophysical experiments was conducted to evaluate a wide variety of previously published, HDR tone-mapping operators. The evaluations were conducted in terms of rendering accuracy and image preference, and from them, a general methodology for evaluating tone-mapping operators was proposed. A next generation image appearance model designated as iCAM06 was developed for HDR image rendering and evaluated according to this methodology. The model, based on iCAM02, incorporates the addition of spatial processing properties in the human vision system that include local adaptation for contrast enhancement, rod and cone functions that enhance detail in highlights and shadows, and functions that predict a number of color appearance phenomena. Evaluation of the model proved iCAM06 to have consistently good HDR rendering performance both in preference and accuracy making iCAM06 a good candidate for a general-purpose tone-mapping operator with potential application to a wide range of image appearance research and practice"--Abstract.

Download or read book The high dynamic range imaging pipeline written by Gabriel Eilertsen and published by Linköping University Electronic Press. This book was released on 2018-05-15 with total page 155 pages. Available in PDF, EPUB and Kindle. Book excerpt: Techniques for high dynamic range (HDR) imaging make it possible to capture and store an increased range of luminances and colors as compared to what can be achieved with a conventional camera. This high amount of image information can be used in a wide range of applications, such as HDR displays, image-based lighting, tone-mapping, computer vision, and post-processing operations. HDR imaging has been an important concept in research and development for many years. Within the last couple of years it has also reached the consumer market, e.g. with TV displays that are capable of reproducing an increased dynamic range and peak luminance. This thesis presents a set of technical contributions within the field of HDR imaging. First, the area of HDR video tone-mapping is thoroughly reviewed, evaluated and developed upon. A subjective comparison experiment of existing methods is performed, followed by the development of novel techniques that overcome many of the problems evidenced by the evaluation. Second, a largescale objective comparison is presented, which evaluates existing techniques that are involved in HDR video distribution. From the results, a first open-source HDR video codec solution, Luma HDRv, is built using the best performing techniques. Third, a machine learning method is proposed for the purpose of reconstructing an HDR image from one single-exposure low dynamic range (LDR) image. The method is trained on a large set of HDR images, using recent advances in deep learning, and the results increase the quality and performance significantly as compared to existing algorithms. The areas for which contributions are presented can be closely inter-linked in the HDR imaging pipeline. Here, the thesis work helps in promoting efficient and high-quality HDR video distribution and display, as well as robust HDR image reconstruction from a single conventional LDR image.

Download or read book Tone Mapping written by Fouad Sabry and published by One Billion Knowledgeable. This book was released on 2024-04-28 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt: What is Tone Mapping Tone mapping is a technique used in image processing and computer graphics to map one set of colors to another to approximate the appearance of high-dynamic-range (HDR) images in a medium that has a more limited dynamic range. Print-outs, CRT or LCD monitors, and projectors all have a limited dynamic range that is inadequate to reproduce the full range of light intensities present in natural scenes. Tone mapping addresses the problem of strong contrast reduction from the scene radiance to the displayable range while preserving the image details and color appearance important to appreciate the original scene content. How you will benefit (I) Insights, and validations about the following topics: Chapter 1: Tone_mapping Chapter 2: Gamma_correction Chapter 3: Multi-exposure_HDR_capture Chapter 4: High-dynamic-range_rendering Chapter 5: Shadow_and_highlight_enhancement Chapter 6: High_dynamic_range Chapter 7: Tone_reproduction Chapter 8: Luminance_HDR Chapter 9: Aurora_HDR Chapter 10: EasyHDR (II) Answering the public top questions about tone mapping. (III) Real world examples for the usage of tone mapping in many fields. Who this book is for Professionals, undergraduate and graduate students, enthusiasts, hobbyists, and those who want to go beyond basic knowledge or information for any kind of Tone Mapping.

Download or read book Tone Mapping for High Dynamic Range Images written by Laurence Meylan and published by . This book was released on 2006 with total page 157 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Tone Mapping Techniques for High Dynamic Range Images written by Christine Bou-Rizk and published by . This book was released on 2013 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Advanced High Dynamic Range Imaging written by Francesco Banterle and published by CRC Press. This book was released on 2017-07-28 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book explores the methods needed for creating and manipulating HDR content. HDR is a step change from traditional imaging; more closely matching what we see with our eyes. In the years since the first edition of this book appeared, HDR has become much more widespread, moving from a research concept to a standard imaging method. This new edition incorporates all the many developments in HDR since the first edition and once again emphasizes practical tips, including the authors' popular HDR Toolbox (available on the authors' website) for MATLAB and gives readers the tools they need to develop and experiment with new techniques for creating compelling HDR content. Key Features: Contains the HDR Toolbox for readers' experimentation on authors' website Offers an up-to-date, detailed guide to the theory and practice of high dynamic range imaging Covers all aspects of the field, from capture to display Provides benchmarks for evaluating HDR imagery

Download or read book The Print written by Ansel Adams and published by Ansel Adams. This book was released on 2018-03-20 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ansel Adams (1902-1984) produced some of the 20th century's most iconic photographic images and helped nurture the art of photography through his creative innovations and peerless technical mastery. The Print--the third volume in Adams' celebrated series of books on photographic techniques--has taught generations of photographers how to explore the artistic possibilities of printmaking. Examples of Adams' own work clarify the principles discussed. This classic handbook distills the knowledge gained through a lifetime in photography and remains as vital today as when it was first published. The Print takes you step-by-step--from designing and furnishing a darkroom to mounting and displaying your photographs, from making your first print to mastering advanced techniques, such as developer modifications, toning and bleaching, and burning and dodging. Filled with indispensable darkroom techniques and tips, this amply illustrated guide shows how printmaking--the culmination of photography's creative process--can be used expressively to enhance an image. "Adams is a clear-thinking writer whose concepts cannot but help the serious photographer." - New York Times "A master-class kind of guide from an undisputed master." - Publishers Weekly Over 1 million copies sold. Publisher's Note: This ebook of The Print works best as a digital companion to the print edition. The ebook was produced by electronically scanning and digitizing a print edition, and as a result, your reading device may display images with halftone or moiré patterns.

Download or read book Adobe Photoshop CS4 for Photographers written by Martin Evening and published by CRC Press. This book was released on 2009-02-16 with total page 703 pages. Available in PDF, EPUB and Kindle. Book excerpt: Master the power of Photoshop CSX with an internationally renowned photographer by your side. New edition even more easily accessible! Adobe's Photoshop CSX comes with powerful new features offering huge payoffs, but it can be overwhelming to learn. Now updated to focus more fully on the core aspects of Photoshop, this new edition, of acclaimed photographer Martin Evening's best-seller is ideal whether you are a beginning Photoshop user wanting to get up to speed fast or more advanced in your Photoshop skills but need a reliable reference for CSX. * Illustrated throughout with before-and-after pictures - over XXX professional, color illustrations * Practical techniques and real-life assignments * Step-by-step tutorials * Keyboard shortcut reference guide Includes FREE DVD with (TO BE UPDATED): * QuickTime movie tutorials for MAC and PC * Searchable tips on tools, palettes layer styles, and shortcuts * Images selected for you to experiment with getting you up to speed fast with everything in the book, including new Photoshop CSX features Get the pre-eminent advice from a highly successful working photographer as Martin completely updates you on the core aspects of working with Photoshop, including organizing your digital workflow, and improving accessibility. Real-life examples, diagrams, illustrations, and step-by-step explanations ensure that you're up to speed with the next generation of digital photography in no time! Foreword by John Nack, Photoshop Product Manager, Adobe (TBC)

Download or read book Advances in Brain Inspired Cognitive Systems written by Cheng-Lin Liu and published by Springer. This book was released on 2016-11-11 with total page 379 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the refereed proceedings of the 8th International Conference on Brain Inspired Cognitive Systems, BICS 2016, held in Beijing, China, in November 2016. The 32 full papers presented were carefully reviewed and selected from 43 submissions. They discuss the emerging areas and challenges, present the state of the art of brain-inspired cognitive systems research and applications in diverse fields by covering many topics in brain inspired cognitive systems related research including biologically inspired systems, cognitive neuroscience, models consciousness, and neural computation.