OpenVLC is an open-source, software-defined, flexible, low-cost Visible Light Communication platform. The software solution is implemented as a Linux driver that can communicate directly with the cape and the Linux networking stack.Visible Light Communication, sometimes also referred to as “LiFi" uses standard off-the-shelf visible light LEDs to transmit data using the visible light spectrum.
This is a technical training presentation on the renewed satcom Newtec DVB-S2 Calculator v2.17 and covers:
- DVB-S
- DVB-S2
- S2 Extensions
For all current Azimuth, Elevation and MDM series (both demods and modems) and includes Sat3Play terminals.
Officially launched beginning of June 2013, this DVB-S2 calculator replaces its widely spread predecessor (which had over 7,000 downloads).
To download the calculator: http://www.newtec.eu/services-training/dvb-s2-calculator
OpenVLC is an open-source, software-defined, flexible, low-cost Visible Light Communication platform. The software solution is implemented as a Linux driver that can communicate directly with the cape and the Linux networking stack.Visible Light Communication, sometimes also referred to as “LiFi" uses standard off-the-shelf visible light LEDs to transmit data using the visible light spectrum.
This is a technical training presentation on the renewed satcom Newtec DVB-S2 Calculator v2.17 and covers:
- DVB-S
- DVB-S2
- S2 Extensions
For all current Azimuth, Elevation and MDM series (both demods and modems) and includes Sat3Play terminals.
Officially launched beginning of June 2013, this DVB-S2 calculator replaces its widely spread predecessor (which had over 7,000 downloads).
To download the calculator: http://www.newtec.eu/services-training/dvb-s2-calculator
Enabling secure management and distribution of live, linear and on demand video, Video Cloud migrates traditional broadcast transmission, cloud based media management, security and online streaming capabilities into a scalable, cloud-based alternative to traditional premise-based video delivery architectures.
Billions of people are watching valuable TV content and advertising on a daily basis.
Different distribution networks transport this content from the content owner to the
consumer. The consumer has the choice to receive a full set of TV channels from many
service providers, be it telco, cable, terrestrial or DTH operators.
In this webinar presentation, presented on May 8, 2012, Steven Soenens from Newtec talked about :
Delivering uptime and quality of service:
- built in MPEG Transport Steam Analyzer
- Carrier ID insertion in the Network Information Table (NIT)
Bandwidth efficiency optimization technologies:
- Automated Equalink® predistortion, providing up to 10% bandwidth gain
- Clean Channel TechnologyTM, improving efficiency by up to 15%
Future-proof solutions:
- easy upgrade from ASI to GbE, from IF-band to L-band
- DVB-S2 extensions and RF Carrier ID - capabilities are anticipated to become available
Enabling secure management and distribution of live, linear and on demand video, Video Cloud migrates traditional broadcast transmission, cloud based media management, security and online streaming capabilities into a scalable, cloud-based alternative to traditional premise-based video delivery architectures.
Billions of people are watching valuable TV content and advertising on a daily basis.
Different distribution networks transport this content from the content owner to the
consumer. The consumer has the choice to receive a full set of TV channels from many
service providers, be it telco, cable, terrestrial or DTH operators.
In this webinar presentation, presented on May 8, 2012, Steven Soenens from Newtec talked about :
Delivering uptime and quality of service:
- built in MPEG Transport Steam Analyzer
- Carrier ID insertion in the Network Information Table (NIT)
Bandwidth efficiency optimization technologies:
- Automated Equalink® predistortion, providing up to 10% bandwidth gain
- Clean Channel TechnologyTM, improving efficiency by up to 15%
Future-proof solutions:
- easy upgrade from ASI to GbE, from IF-band to L-band
- DVB-S2 extensions and RF Carrier ID - capabilities are anticipated to become available
We present a survey of transport methods for 3-D
video ranging from early analog 3DTV systems to most recent
digital technologies that show promise in designing 3DTV systems
of tomorrow. Potential digital transport architectures for 3DTV
include the DVB architecture for broadcast and the Internet
Protocol (IP) architecture for wired or wireless streaming. There
are different multiview representation/compression methods for
delivering the 3-D experience, which provide a tradeoff between
compression efficiency, random access to views, and ease of rate
adaptation, including the “video-plus-depth” compressed representation
and various multiview video coding (MVC) options.
Commercial activities using these representations in broadcast
and IP streaming have emerged, and successful transport of such
data has been reported. Motivated by the growing impact of the
Internet protocol based media transport technologies, we focus on
the ubiquitous Internet as the network infrastructure of choice for
future 3DTV systems. Current research issues in unicast and multicast
mode multiview video streaming include network protocols
such as DCCP and peer-to-peer protocols, effective congestion
control, packet loss protection and concealment, video rate adaptation,
and network/service scalability. Examples of end-to-end
systems for multiview video streaming have been provided.
漢語間統計式機器翻譯語料處理-用臺灣閩南語示範
Corpus Preprocessing for Statistical Machine Translation between the Chinese Languages - Using Taiwan Southern Min as Examples
臺灣是一个多元民族、多元語言的國家。
講母語、使用母語是上基本的權利,
毋過母語的電腦相關應用煞誠少,
需要加強自然語言處理的研究佮語料收集整理。
臺灣本土語言百百種,
本論文是針對閩南語,
研究伊翻譯語料的特性。
除了閩南語本身以外,
嘛希望研究結果對別的本土語言有幫助。
本論文提出一个自動整理漢語語料的方法,
予資訊無完整的語料庫補足資訊,
發揮上大的價值,
BLEU分數對9.30搝到13.82。
另外閣用實驗證明平行語料數量無到十萬句的時,
加語料對翻譯的效果影響非常大,
原本64121句加到99147句了後,
BLEU分數對13.82提昇到19.33。
DVB is a set of standards that define digital broadcasting using existing satellite, cable, and terrestrial infrastructures.
The term digital television is sometimes used as a synonym for DVB
Prototype of a Wireless PC2TV solution. Extending your PC/laptop screen to a digital television or a projector at your home, office or an exhibition center.
Securing your Kubernetes cluster_ a step-by-step guide to success !KatiaHIMEUR1
Today, after several years of existence, an extremely active community and an ultra-dynamic ecosystem, Kubernetes has established itself as the de facto standard in container orchestration. Thanks to a wide range of managed services, it has never been so easy to set up a ready-to-use Kubernetes cluster.
However, this ease of use means that the subject of security in Kubernetes is often left for later, or even neglected. This exposes companies to significant risks.
In this talk, I'll show you step-by-step how to secure your Kubernetes cluster for greater peace of mind and reliability.
GraphSummit Singapore | The Art of the Possible with Graph - Q2 2024Neo4j
Neha Bajwa, Vice President of Product Marketing, Neo4j
Join us as we explore breakthrough innovations enabled by interconnected data and AI. Discover firsthand how organizations use relationships in data to uncover contextual insights and solve our most pressing challenges – from optimizing supply chains, detecting fraud, and improving customer experiences to accelerating drug discoveries.
PHP Frameworks: I want to break free (IPC Berlin 2024)Ralf Eggert
In this presentation, we examine the challenges and limitations of relying too heavily on PHP frameworks in web development. We discuss the history of PHP and its frameworks to understand how this dependence has evolved. The focus will be on providing concrete tips and strategies to reduce reliance on these frameworks, based on real-world examples and practical considerations. The goal is to equip developers with the skills and knowledge to create more flexible and future-proof web applications. We'll explore the importance of maintaining autonomy in a rapidly changing tech landscape and how to make informed decisions in PHP development.
This talk is aimed at encouraging a more independent approach to using PHP frameworks, moving towards a more flexible and future-proof approach to PHP development.
Transcript: Selling digital books in 2024: Insights from industry leaders - T...BookNet Canada
The publishing industry has been selling digital audiobooks and ebooks for over a decade and has found its groove. What’s changed? What has stayed the same? Where do we go from here? Join a group of leading sales peers from across the industry for a conversation about the lessons learned since the popularization of digital books, best practices, digital book supply chain management, and more.
Link to video recording: https://bnctechforum.ca/sessions/selling-digital-books-in-2024-insights-from-industry-leaders/
Presented by BookNet Canada on May 28, 2024, with support from the Department of Canadian Heritage.
Generative AI Deep Dive: Advancing from Proof of Concept to ProductionAggregage
Join Maher Hanafi, VP of Engineering at Betterworks, in this new session where he'll share a practical framework to transform Gen AI prototypes into impactful products! He'll delve into the complexities of data collection and management, model selection and optimization, and ensuring security, scalability, and responsible use.
DevOps and Testing slides at DASA ConnectKari Kakkonen
My and Rik Marselis slides at 30.5.2024 DASA Connect conference. We discuss about what is testing, then what is agile testing and finally what is Testing in DevOps. Finally we had lovely workshop with the participants trying to find out different ways to think about quality and testing in different parts of the DevOps infinity loop.
Epistemic Interaction - tuning interfaces to provide information for AI supportAlan Dix
Paper presented at SYNERGY workshop at AVI 2024, Genoa, Italy. 3rd June 2024
https://alandix.com/academic/papers/synergy2024-epistemic/
As machine learning integrates deeper into human-computer interactions, the concept of epistemic interaction emerges, aiming to refine these interactions to enhance system adaptability. This approach encourages minor, intentional adjustments in user behaviour to enrich the data available for system learning. This paper introduces epistemic interaction within the context of human-system communication, illustrating how deliberate interaction design can improve system understanding and adaptation. Through concrete examples, we demonstrate the potential of epistemic interaction to significantly advance human-computer interaction by leveraging intuitive human communication strategies to inform system design and functionality, offering a novel pathway for enriching user-system engagements.
UiPath Test Automation using UiPath Test Suite series, part 5DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 5. In this session, we will cover CI/CD with devops.
Topics covered:
CI/CD with in UiPath
End-to-end overview of CI/CD pipeline with Azure devops
Speaker:
Lyndsey Byblow, Test Suite Sales Engineer @ UiPath, Inc.
Smart TV Buyer Insights Survey 2024 by 91mobiles.pdf91mobiles
91mobiles recently conducted a Smart TV Buyer Insights Survey in which we asked over 3,000 respondents about the TV they own, aspects they look at on a new TV, and their TV buying preferences.
LF Energy Webinar: Electrical Grid Modelling and Simulation Through PowSyBl -...DanBrown980551
Do you want to learn how to model and simulate an electrical network from scratch in under an hour?
Then welcome to this PowSyBl workshop, hosted by Rte, the French Transmission System Operator (TSO)!
During the webinar, you will discover the PowSyBl ecosystem as well as handle and study an electrical network through an interactive Python notebook.
PowSyBl is an open source project hosted by LF Energy, which offers a comprehensive set of features for electrical grid modelling and simulation. Among other advanced features, PowSyBl provides:
- A fully editable and extendable library for grid component modelling;
- Visualization tools to display your network;
- Grid simulation tools, such as power flows, security analyses (with or without remedial actions) and sensitivity analyses;
The framework is mostly written in Java, with a Python binding so that Python developers can access PowSyBl functionalities as well.
What you will learn during the webinar:
- For beginners: discover PowSyBl's functionalities through a quick general presentation and the notebook, without needing any expert coding skills;
- For advanced developers: master the skills to efficiently apply PowSyBl functionalities to your real-world scenarios.
Encryption in Microsoft 365 - ExpertsLive Netherlands 2024Albert Hoitingh
In this session I delve into the encryption technology used in Microsoft 365 and Microsoft Purview. Including the concepts of Customer Key and Double Key Encryption.
Observability Concepts EVERY Developer Should Know -- DeveloperWeek Europe.pdfPaige Cruz
Monitoring and observability aren’t traditionally found in software curriculums and many of us cobble this knowledge together from whatever vendor or ecosystem we were first introduced to and whatever is a part of your current company’s observability stack.
While the dev and ops silo continues to crumble….many organizations still relegate monitoring & observability as the purview of ops, infra and SRE teams. This is a mistake - achieving a highly observable system requires collaboration up and down the stack.
I, a former op, would like to extend an invitation to all application developers to join the observability party will share these foundational concepts to build on:
SAP Sapphire 2024 - ASUG301 building better apps with SAP Fiori.pdfPeter Spielvogel
Building better applications for business users with SAP Fiori.
• What is SAP Fiori and why it matters to you
• How a better user experience drives measurable business benefits
• How to get started with SAP Fiori today
• How SAP Fiori elements accelerates application development
• How SAP Build Code includes SAP Fiori tools and other generative artificial intelligence capabilities
• How SAP Fiori paves the way for using AI in SAP apps
A tale of scale & speed: How the US Navy is enabling software delivery from l...sonjaschweigert1
Rapid and secure feature delivery is a goal across every application team and every branch of the DoD. The Navy’s DevSecOps platform, Party Barge, has achieved:
- Reduction in onboarding time from 5 weeks to 1 day
- Improved developer experience and productivity through actionable findings and reduction of false positives
- Maintenance of superior security standards and inherent policy enforcement with Authorization to Operate (ATO)
Development teams can ship efficiently and ensure applications are cyber ready for Navy Authorizing Officials (AOs). In this webinar, Sigma Defense and Anchore will give attendees a look behind the scenes and demo secure pipeline automation and security artifacts that speed up application ATO and time to production.
We will cover:
- How to remove silos in DevSecOps
- How to build efficient development pipeline roles and component templates
- How to deliver security artifacts that matter for ATO’s (SBOMs, vulnerability reports, and policy evidence)
- How to streamline operations with automated policy checks on container images
2. Index
• Introduction
• 3DTV Broadcast
• 3DTV Over IP Networks
• Discussion and Conclusion
2
3. Introduction
• Ultimate goal
• dynamic holography
• Most systems available today
• via stereoscopy
• Actually, 3DTV systems can be designed to support
• fixed-view stereoscopy: only two views
• free-view stereoscopy: multiple views
3
4. Introduction
• History of 3-D movie
• 1903, first stereoscopic 3-D movie was created
• 1922, the first full length stereoscopic movie was shown
• in the 1950s, Hollywood started 3-D movie production in big
numbers
• Consensus: a lasting success
• backwards compatible
• supports different numbers of users
• with affordable 3-D display technologies
• requires low additional transport/transmission overhead
• perceived quality and viewing comfort is better 4
5. 3DTV Broadcast
• Analog Transmission
• US
• April 29th, 1953: a trial live broadcast of the series SPACE
PATROL was run in Los Angeles
• viewers with a pair of special polarization lenses
• December 19th, 1980: The first “nonexperimental” 3DTV “Miss
Sadie Thompson,” and Three Stooges
• 3-D Video Corporation developed a system: anaglyph format
• April 10th, 1981: musical classic, “Kiss Me Kate.”
• 3-D Video Corporation: perfect in color
5
6. 3DTV Broadcast
• Analog Transmission
• European
• 1982: Netherlands two popular-scientific 3-D series
• a simple red/green anaglyph format
• H.-J. Herbst (Hamburg, Germany) and Philips Research Lab
• More than 40 million red/green viewing spectacles were sold
• “the TV of the future” was disillusioned
• 1983 at the International Audio and Video Fair in Berlin
• based on a standard PAL channel chain in two-channel mode
• For display, two projectors with orthogonal polarization filters were
used
• so successful that were continued at IAVF in 1985 and 1987
• Unfortunately, transmission system required custom receiver.
6
LIMITED
7. 3DTV Broadcast
• Digital Transmission
• Background: ongoing transition from analogue to digital TV
services
• MPEG developed a new compression technology as part of
MPEG-2
• The MPEG-2 multiview profile (MVP)
• Left-eye view --- MPEG-2 main profile --- backwards-
compatibility
• Right-eye enhancement layer using the scalable coding tools
• MVP, unfortunately, has not found use in commercially
services 7
8. 3DTV Broadcast
• Digital Transmission
• Some promising attempts
• 1998 Nagano Winter Games in Japan
• right-eye and left-eye HDTV images @ 45Mbps
• projected onto a large screen. Impressing and Powerful
• 2002 FIFA World Cup in Korea/Japan
• the right-eye and left-eye HDTV images were compressed in
side-by-side format using the MPEG-2 Main Profile
8
9. 3DTV Broadcast
• Digital Transmission
• Fixed-view -> flexible 3-D visual data representation
formats
• Australian DDD company : “video-plus-depth”
representation
• combination of monoscopic color video and associated per-
pixel depth maps
• encodes the depth data low bit rate format
• transmitted in the “user data” of an MPEG-2 Transport Stream
• receiver : rendered by using depth-image-based rendering
(DIBR)
9
10. 3DTV Broadcast
• Digital Transmission
• European IST project ATTEST
• “video-plus-depth” representation
• Standard MPEG technologies: H.264/AVC
• depth data: 200–300 kbps
• overhead for the 3-D visual information is only 10% CMP 2-D
10
11. 3DTV Broadcast
• Digital Transmission
• European IST project ATTEST
• First demonstration based on ATTEST
• Diagram as follows
1st demo of a 3DTV service 3-D programs,the “video-plus-depth” 3-D
TS Contained two
on each contains
basedvideo stream
• an MPEG-2 coded color
data representation formatcoded depth-image DVB-T transmission.
• an H.264/AVC using a real sequence.
DTV-Recorder-Generator PC with a PCI DVB-T card
11
real-time replay of an offline- Received MPEG-2 TS was demultiplexed in software
generated MPEG-2 TS video bit streams were decoded in real-time
12. 3DTV Broadcast
• Digital Transmission
• “video-plus-depth” representation has been standardized
within MPEG as a result of work initiated by Philips and
Fraunhofer HHI.
• The new standard has been published in two parts:
• Specification of the depth format itself is called ISO/IEC
23002-3 (MPEG-C)
• a method for transmitting “video-plus-depth” within a
conventional MPEG-2 TS has become an amendment (Amd. 2)
to ISO/IEC 13818-1 (MPEG-2 Systems).
12
13. 3DTV Over IP Networks
• Background
• IP is proving to be flexible in accommodating
communication services
• Classical telephone -> VOIP
• Transmission of video over Internet is active in R & D
• VoD
• 2.5G and 3G offer wireless video service
• The IP itself leaves many aspects of the transmission to be
defined by other layers of the protocol stack and,
• thus, offers flexibility in designing the optimal
communications system for various 3-D data 13
representations and encoding schemes.
14. 3DTV Over IP Networks
• General Outline
• 3DTV streaming architectures
• Server Unicasting
• Server Multicasting
• P2P Unicasting
• P2P Multicasting
• Protocol
• Current state of the art: RTP/UDP/IP 14
• Next generation: RTP/DCCP/IP
15. 3DTV Over IP Networks
• Streaming Protocols
• Most widely used : RTP over UDP
• does not contain any congestion control mechanism
• lead to congestion collapse when large volumes of video are
delivered
• Datagram congestion control protocol (DCCP) is designed as
a replacement for UDP for media delivery
• TCP minus reliability and in-order packet delivery
• UDP plus congestion control, connection setup, and
acknowledgements 15
16. 3DTV Over IP Networks
• Streaming Protocols
• DCCP is a transport protocol that implements bi-directional
unicast connections of congestion-controlled, unreliable
datagrams.
• Despite of the unreliable datagram flow
• Reliable handshakes for connection setup/teardown and
reliable negotiation of options
16
17. 3DTV Over IP Networks
• Streaming Protocols
• DCCP also accommodates two congestion control
mechanisms.
• TCP-like Congestion Control
• TCP-Friendly Rate Control(TFRC)
• TCP-like Congestion Control
• identified by CongestionCCID2 in DCCP
• behaves similar to TCP’s AIMD congestion control
• halving the congestion window in response to a packet drop
• respond quickly to changes in available bandwidth 17
• must tolerate the abrupt changes in the congestion window size
18. 3DTV Over IP Networks
• Streaming Protocols
• TCP-Friendly Rate Control(TFRC)
• identified by CCID3
• a form of equation-based flow control that minimizes abrupt
changes in the sending rate while maintaining longer-term
fairness with TCP
• Appropriate for applications that would prefer a rather smooth
sending-rate with a small or moderate receiver buffer
• streaming media applications
18
19. 3DTV Over IP Networks
• Streaming Protocols
• TCP-Friendly Rate Control(TFRC)
• Operation: CCID3/TFRC calculates TFRC rate
• using the TCP throughput equation
• Request gives feedback to sender application
• Sender may use this rate information to adjust rate to get better
results
19
20. 3DTV Over IP Networks
• Streaming Protocols
• (exp)RFC for TCP-Friendly Multicast Congestion Control
(TFMC)
• compute the TFRC rate in a multicast scenario
• each receiver computes own TFRC rate as a function of RTT
loss rate
• server then selects the minimum of these rates
• (limited number clients to prevent feedback explosion)
• DCCP is the same way doing this.
• Hence, future 3DTV over IP services is expected to employ
the DCCP protocol with effective video rate adaptation to 20
match the TFRC rate.
21. 3DTV Over IP Networks
• Multiview Video Encoding and Rate
Allocation/Adaptation
• Multiview 3-D video can be represented and encoded
• Implicitly: “video-plus-depth” representation (discussed)
• Explicitly: in raw form
• a trade-off between
• random access
• ease of rate adaptation
• compression efficiency
• simulcast coding
• scalable simulcast coding
• multiview coding
• scalable multiview coding 21
22. 3DTV Over IP Networks
• Multiview Video Encoding and Rate Allocation/Adaptation
• The rate adaptation differs, since rate allocation between views
offers new flexibilities.
• According to the suppression theory of human visual
perception
• if the right and left views are transmitted and displayed with
unequal spatial, temporal and/or quality resolutions, the overall 3-
D video quality is determined by the view with the better resolution
• Therefore, rate adaptation may be achieved by
• adaptation of the spatial, temporal and/or signal-to-noise (SNR)
resolution of one of the views
• while encoding/transmitting the other view at full rate. 22
23. 3DTV Over IP Networks
• Multiview Video Encoding and Rate
Allocation/Adaptation
• Several open loop and closed loop rate adaptation strategies
• closed loop strategies
• client estimates some function of the received signal and feeds
it back to the transmitter
• The transmitter determines an optimized rate
• open loop strategies
• transmitter does not use feedback from the receiver
23
24. 3DTV Over IP Networks
• Multiview Video Encoding and Rate
Allocation/Adaptation
• open-loop rate adaptation strategies
• First paper: content-adaptive video scaling
• Rate adaptation has been achieved by
• 1) spatial subsampling;
• 2) temporal subsampling;
• 3) scaling the quantization step-size;
• 4) content-adaptive scaling
• content-adaptive video scaling approach
• Four categories: high/low temporal spatial detail.
• Scaling their resolutions
24
• Experiments show that better compression with better quality
25. 3DTV Over IP Networks
• Multiview Video Encoding and Rate Allocation/Adaptation
• open-loop rate adaptation strategies
• Second paper: adaptive selection of temporal levels and quality
layers
• video is encoded offline with a predetermined number of spatial,
temporal and SNR scalability layers.
• Content-aware bit allocation among the views is performed during
bit stream extraction by adaptive selection scalability layers
• The required bit rate reduction is only applied to one of the views.
• Experiments shows that better rate-distortion performance
compared to static cases.
25
26. 3DTV Over IP Networks
• Multiview Video Encoding and Rate Allocation/Adaptation
• closed-loop rate adaptation strategies
• rate adaptation is done at the server side by feedback from the user.
• First paper:
• The user’s head position is tracked and predicted
• The system allocates more bandwidth to the selected views in order
to render the current viewing angle.
• Make use of MVC and SVC
• Second paper:
• Each view is streamed to a different IP-multicast address
• A viewer’s client joins appropriate multicast groups to only receive
the 3-D information relevant to its current viewpoint 26
27. 3DTV Over IP Networks
• Error Correction and Concealment
• Sources: packet losses in the wired or wireless IP links
• Wired Internet: Congestion -> packet losses
• Wireless Internet: capacity limited by bandwidth of radio
spectrum
• Noise, interference and fading, error bursts(from mobility)
• Joint source and channel coding techniques
• Error concealment methods (at the decoder) to limit temporal
error propagation
27
28. 3DTV Over IP Networks
• Error Correction and Concealment
• Common error correction approaches for reliable
transmission
• ARQ
• ACK
• Delay, not desirable
• FEC
• In broadcast and multicast services, channel coding
techniques have been widely applied
28
29. 3DTV Over IP Networks
• Error Correction and Concealment
• First paper:
• Macroblock classification into unequally important slice groups
• Using FMO tool of H.264/AVC
• LT codes are used for error protection for low complexity and
advanced performace
29
30. 3DTV Over IP Networks
• Error Correction and Concealment
• Second paper:
• Stereoscopic video streaming using FEC techniques
• Frames are classified according to their contribution to overall
quality
• three layers used for UEP
• I-frame
• P-frame
• Left
• Right
• To find optimum packetization and UEP strategies
• Comparative analysis and simulation of Reed–Solomon (RS) and 30
systematic Luby transform (LT) codes
31. 3DTV Over IP Networks
• Error Correction and Concealment
• Error concealment algorithm for monoscopic not applicable
for stereoscopic.
• Based on interpolation -> is not sufficient for not depth info is
preserved.
• Human perception of errors in 3-D video is different
• A small degradation -> significant perceptual distortion
• Third paper: an error concealment algorithm
• Make full use of characteristic of stereoscopic video
• Based on the relativity of prediction mode of right frames ->
prediction mode of macroblock
• restore the lost macroblock according to the estimated motion 31
vector or disparity vector.
32. 3DTV Over IP Networks
• Error Correction and Concealment
• capabilities of error concealment
• To increase the quality of the reconstructed block
• a stereoscopic movie: the two views are highly
correlated(why)
• information about the corresponding region is highly useful
for the reconstruction of the lost block.
• corresponding pixel pairs identified using feature matching and
principles of epipolar geometry
• robust estimation of the transformation parameters is used to 32
educe the negative effect of outliers
33. 3DTV Over IP Networks
• 3D Video Streaming Demonstrations
• end-to-end prototype system for point-to-point streaming of
stereoscopic video over UDP
supports the
1.over a LAN autostereoscopic
Sharp 3-D laptop
with no
packet losses
supports a monocular
display to demonstrate
2.employs the backwards
protocol stack compatibility
RTP/UDP/IP
supports an in-house
polarized 3-D
projection display
system
that uses a pair
projector
33
34. Discussion and conclusion
• A comprehensive survey of the state-of-the art in
transport techniques
• While the transport solutions must address backwards
compatibility issues with the existing digital TV
standards and infrastructure
• 3DTV flexible
• Current and future research issues for 3-D TV
transmission
• joint transport and coding
• Why
• determination of the best rate adaptation method
• error resilient video encoding and streaming strategies 34