The MPEG handbook : MPEG-1, MPEG-2, MPEG-4 / / John Watkinson

• Record Nr.: UNINA9910457498603321
• Autore: Watkinson John
• Pubbl/distr/stampa: Oxford : , : Focal Press, , 2004
• ISBN: 1-136-02897-8; 1-136-02898-6; 1-281-00867-2; 9786611008673; 0-08-047953-7
• Edizione: [2nd ed.]
• Descrizione fisica: 1 online resource (449 p.)
• Disciplina: 621.38970218
• Soggetti: MPEG (Video coding standard); Data compression (Telecommunication) - Standards; Sound - Recording and reproducing - Digital techniques - Standards; Electronic books.
• Lingua di pubblicazione: Inglese
• Formato: Materiale a stampa
• Livello bibliografico: Monografia
• Note generali: Previous ed.: 2001.
• Nota di bibliografia: Includes bibliographical references and index.
• Nota di contenuto: Cover; The MPEG Handbook: MPEG-1, MPEG-2, MPEG-4; Copyright; Contents; Preface; Acknowledgements; 1 Introduction to compression; 1.1 What is MPEG?; 1.2 Why compression is necessary; 1.3 MPEG-1, 2, 4 and H.264 contrasted; 1.4 Some applications of compression; 1.5 Lossless and perceptive coding; 1.6 Compression principles; 1.7 Video compression; 1.7.1 Intra-coded compression; 1.7.2 Inter-coded compression; 1.7.3 Introduction to motion compensation; 1.7.4 Film-originated video compression; 1.8 Introduction to MPEG-1; 1.9 MPEG-2: Profiles and Levels; 1.10 Introduction to MPEG-4; 1.11 Introduction to H.264 (AVC)1.12 Audio compression; 1.12.1 Sub-band coding; 1.12.2 Transform coding; 1.12.3 Predictive coding; 1.13 MPEG bitstreams; 1.14 Drawbacks of compression; 1.15 Compression pre-processing; 1.16 Some guidelines; References; 2 Fundamentals; 2.1 What is an audio signal?; 2.2 What is a video signal?; 2.3 Types of video; 2.4 What is a digital signal?; 2.5 Sampling; 2.6 Reconstruction; 2.7 Aperture effect; 2.8 Choice of audio sampling rate; 2.9 Video sampling structures; 2.10 The phase-locked loop; 2.11 Quantizing; ; 2.12 Quantizing error; 2.13 Dither; 2.14 Introduction to digital processing2.15 Logic elements; 2.16 Storage elements; 2.17 Binary coding; 2.18 Gain control; 2.19 Floating-point coding; 2.20 Multiplexing principles; 2.21 Packets; 2.22 Statistical multiplexing; 2.23 Timebase correction; References; 3 Processing for compression; 3.1 Introduction; 3.2 Transforms; 3.3 Convolution; 3.4 FIR and IIR filters; 3.5 FIR filters; 3.6 Interpolation; 3.7 Downsampling filters; 3.8 The quadrature mirror filter; 3.9 Filtering for video noise reduction; 3.10 Warping; 3.11 Transforms and duality; 3.12 The Fourier transform; 3.13 The discrete cosine transform (DCT)3.14 The wavelet transform; 3.15 The importance of motion compensation; 3.16 Motion-estimation techniques; 3.16.1 Block matching; 3.16.2 Gradient matching; 3.16.3 Phase correlation; 3.17 Motion-compensated displays; 3.18 Camera-shake compensation; 3.19 Motion-compensated de-interlacing; 3.20 Compression and requantizing; References; 4 Audio compression; 4.1 Introduction; 4.2 The deciBel; 4.3 Audio level metering; 4.4 The ear; 4.5 The cochlea; 4.6 Level and loudness; 4.7 Frequency discrimination; 4.8 Critical bands; 4.9 Beats; 4.10 Codec level calibration4.11 Quality measurement; 4.12 The limits; 4.13 Compression applications; 4.14 Audio compression tools; 4.15 Sub-band coding; 4.16 Audio compression formats; 4.17 MPEG audio compression; 4.18 MPEG Layer I audio coding; 4.19 MPEG Layer II audio coding; 4.20 MPEG Layer III audio coding; 4.21 MPEG-2 AAC - advanced audio coding; 4.22 Dolby AC-3; 4.23 MPEG-4 audio; 4.24 MPEG-4 AAC; 4.25 Compression in stereo and surround sound; References; 5 MPEG video compression; 5.1 The eye; 5.2 Dynamic resolution; 5.3 Contrast; 5.4 Colour vision; 5.5 Colour difference signals; 5.6 Progressive or interlaced scan?
• Sommario/riassunto: A complete, professional 'bible' on all aspects of audio and video compression using MPEG technology, including the MPEG-4 standard and, in this second edition, H-264. The clarity of explanation and depth of technical detail combine to make this book an essential and definitive reference work.THE MPEG HANDBOOK is both a theoretical and practical treatment of the subject. Fundamental knowledge is provided alongside practical guidance on how to avoid pitfalls and poor quality. The often-neglected issues of reconstructing the signal timebase at the decoder and of

Social justice and library work : a guide to theory and practice / / Stephen Bales

• Record Nr.: UNINA9910583091003321
• Autore: Bales Stephen
• Pubbl/distr/stampa: Cambridge, Massachusetts : , : Chandos Publishing is an imprint of Elsevier, , 2018; ©2018
• ISBN: 0-08-101758-8; 0-08-101755-3
• Descrizione fisica: 1 online resource (201 pages)
• Disciplina: 020.1
• Soggetti: Library science - Sociological aspects
• Lingua di pubblicazione: Inglese
• Formato: Materiale a stampa
• Livello bibliografico: Monografia
• Nota di bibliografia: Includes bibliographical references at the end of each chapters and index.
• Nota di contenuto: 1. Introduction -- ; 1.1. A Preliminary Note Concerning Terminology -- ; 1.2. Introduction: Theory, Practice, Praxis, and Library Work -- ; 1.3. Objectives of this Guide -- ; 1.4. What is Social Justice? -- ; 1.5. Social Justice and Library Work -- ; 1.6. Prominent Threads in Transformative Library Research for Practice -- ; 1.7. Who can be a Transformative Library Worker? A Call for Inclusion -- ; 1.8. The Rest of the Guide (and How to Use It) -- References -- ; 2. Theory: Intellectual Building-Blocks for Transformative Librarianship -- ; 2.1. Introduction -- References -- ; 3. Practice: Tools for Transformative Library Work -- ; 3.1. Introduction -- ; 3.2. News, Commentary, and Blogs -- ; 3.3. Online Information Hubs and Portals -- ; 3.4. Subscription Online Databases, Indexes, and Directories -- ; 3.5. Free Online Databases, Indexes, and Directories -- ; 3.6. Reference Resources (Print and Electronic) -- ; 3.7. Legal Resources -- ; 3.8. Organizations, Associations, and Advocacy Groups -- ; 3.9. Professional Networking Tools and Opportunities -- ; 3.10. Projects, Programs, and Initiatives -- ; 3.11. Training Programs, Courses, and Materials -- ; 3.12. Toolkits -- ; 3.13. Publishing Outlets (Periodicals) -- ; 3.14. Publishing Outlets (Books) -- ; 3.15. Grants and Awards -- References -- ; 4. Praxis: Theory in Practice -- ; 4.1. Introduction -- ; 4.2. ARL Diversity and ; Leadership Programs: With Mark A. Puente, Director -- ; 4.3. The 2016 Los Angeles Anarchist Book Fair: With Javier Sethness, Organizer -- ; 4.4. Free Government Information: With James R. Jacobs, Cofounder -- ; 4.5. Lesbian Herstory Archives: With Deborah Edel, Cofounder -- ; 4.6. Librarians and Archivists With Palestine: With Hannah Mermelstein, Cofounder -- ; 4.7. Seattle Public Library, Books on Bikes Program: With Jared L. Mills, Founder -- ; 4.8. Occupy Wall Street Library: With Zachary Loeb, Occupy Librarian -- References -- ; 5. Conclusion: The Transformative Library Worker -- ; 5.1. Introduction -- ; 5.2. A Political Clarity and Commitment -- ; 5.3. An Attitude of Theoretical Inquisitiveness Tempered by a Critical Consciousness -- ; 5.4. An Attitude of Postprofessionalism -- ; 5.5. Conclusion -- References.
• Sommario/riassunto: "Although they may not have always been explicitly stated, library work has always had normative goals. Until recently, such goals have largely been abstract; they are things like knowledge creation, education, forwarding science, preserving history, supporting democracy, and safeguarding civilization. The modern spirit of social and cultural critique, however, has focused our attention on the concrete, material relationships that determine human potentiality and opportunity, and library workers are increasingly seeing the institution of the library, as well as library work, as embedded in a web of relations that extends beyond the library's traditional sphere of influence. In light of this critical consciousness, more and more library and information science professionals are coming to see themselves as change agents and frontline advocates of social justice issues. This book will serve as a guide for those library workers and related information professionals who disregard traditional ideas of 'library neutrality' and static, idealized conceptions of Western culture. The book will work as an entry point for those just forming a consciousness oriented toward social justice work and will be also be [sic] of value to more experienced 'transformative library workers' as an up-to-date supplement to their praxis." -- rear cover.