REMOWZ - Realtime Water Quality Monitoring using ZigBee based WSN (Part I)
A Realtime No Reference Video Quality Analysis...2001/10/03 · A Realtime No Reference Video...
Transcript of A Realtime No Reference Video Quality Analysis...2001/10/03 · A Realtime No Reference Video...
2 MAR | Re | 08/00 | 11 DIGITAL VIDEO QUALITY ANALYZERS DVQ / DVQMRSA | OCT/03/01
A Realtime No ReferenceVideo Quality Analysis
DIGITAL VIDEO QUALITY ANALYZERS DVQ / DVQMRSA | OCT/03/2001 | 2
Overview &Abstracts
Video QualityEvaluation Basics
Theory of the IfN/R&S Algorithm
Single Channel Instrument DVQ
Multi Channel DeviceDVQM
ApplicationExamples
SampleMeasurements
Conclusions
Abstracts of the IfN/R&S Algorithm
Joint Development
u Institute of Telecommunication Technologies (“IfN”) of Technical University
Braunschweig, Germany headed by Prof. Ulrich Reimers
u Rohde & Schwarz Broadcast Division
Real time process
Without reference (NR) or with reduced reference (RR) signal
Analysis of DCT compressed video sequences
u i.e. MPEG2 encoded
Analog distortions cannot be addressed
DIGITAL VIDEO QUALITY ANALYZERS DVQ / DVQMRSA | OCT/03/2001 | 3
Overview &Abstracts
Video QualityEvaluation Basics
Theory of the IfN/R&S Algorithm
Single Channel Instrument DVQ
Multi Channel DeviceDVQM
ApplicationExamples
SampleMeasurements
Conclusions
Basic Image Data Analysis (I)Averaged amplitude differences of adjacent pixel pairs relative to their position in the macro block grid
0 8 15
AD(0)AD(1)AD(2)
....AD(i) = AD(5)
....AD(8)
....AD(15)
Macro blockboundaries
Blockboundaries
Relative positionin macro block
DIGITAL VIDEO QUALITY ANALYZERS DVQ / DVQMRSA | OCT/03/2001 | 4
Overview &Abstracts
Video QualityEvaluation Basics
Theory of the IfN/R&S Algorithm
Single Channel Instrument DVQ
Multi Channel DeviceDVQM
ApplicationExamples
SampleMeasurements
Conclusions
Basic Image Data Analysis (II)normalized sum of all ADx(i=0) .... ADx(i=15)of all macro blocksin all lines
total 3 * 16 values in x-direction(Y, Cb, Cr)
normalized sum of all ADy(i=0) .... ADy(i=15)of all macro blocksin all columns
total 3 * 16 values in y-direction(Y, Cb, Cr)
u In both directionsu Separately for Y and C’s
DIGITAL VIDEO QUALITY ANALYZERS DVQ / DVQMRSA | OCT/03/2001 | 5
Overview &Abstracts
Video QualityEvaluation Basics
Theory of the IfN/R&S Algorithm
Single Channel Instrument DVQ
Multi Channel DeviceDVQM
ApplicationExamples
SampleMeasurements
Conclusions
Analysis Results of non-coded ImagesExample: Flowergarden - original sequence without compression
0 2 4 6 8 10 12 14 16 18 20 22 24 260
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rag
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Frame number
AD(i=0) AD(i=1) AD(i=2) AD(i=3) AD(i=4) AD(i=5) AD(i=6) AD(i=7) AD(i=8) AD(i=9) AD(i=10) AD(i=11) AD(i=12) AD(i=13) AD(i=14) AD(i=15)
DIGITAL VIDEO QUALITY ANALYZERS DVQ / DVQMRSA | OCT/03/2001 | 6
Overview &Abstracts
Video QualityEvaluation Basics
Theory of the IfN/R&S Algorithm
Single Channel Instrument DVQ
Multi Channel DeviceDVQM
ApplicationExamples
SampleMeasurements
Conclusions
Analysis Results of coded ImagesExample: “Flowergarden” - compressed sequence 2 Mbit/s
0 2 4 6 8 10 12 14 16 18 20 22 24 260
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Frame number
AD(i=0) AD(i=1) AD(i=2) AD(i=3) AD(i=4) AD(i=5) AD(i=6) AD(i=7) AD(i=8) AD(i=9) AD(i=10) AD(i=11) AD(i=12) AD(i=13) AD(i=14) AD(i=15)
Spatial Activity SA
DVQL-U
DIGITAL VIDEO QUALITY ANALYZERS DVQ / DVQMRSA | OCT/03/2001 | 7
Overview &Abstracts
Video QualityEvaluation Basics
Theory of the IfN/R&S Algorithm
Single Channel Instrument DVQ
Multi Channel DeviceDVQM
ApplicationExamples
SampleMeasurements
Conclusions
Involves Parameter “Spatial Activity” (SA)
u Average of amplitude differences of all pixels
u Describes the amount of details within one single frame
SA low SA high
Subjective Weighting (part I)
DIGITAL VIDEO QUALITY ANALYZERS DVQ / DVQMRSA | OCT/03/2001 | 8
Overview &Abstracts
Video QualityEvaluation Basics
Theory of the IfN/R&S Algorithm
Single Channel Instrument DVQ
Multi Channel DeviceDVQM
ApplicationExamples
SampleMeasurements
Conclusions
Involves Parameter “Temporal Activity” (TA)
u Average of all amplitude differences of the same pixels in subsequent frames
u Describes the "motion” within a sequence
u Determined by grouping pixels by eight and averaging their amplitudes in
subsequent frames
TA small TA high (maximum)
t t
Subjective Weighting (part II)
DIGITAL VIDEO QUALITY ANALYZERS DVQ / DVQMRSA | OCT/03/2001 | 9
Overview &Abstracts
Video QualityEvaluation Basics
Theory of the IfN/R&S Algorithm
Single Channel Instrument DVQ
Multi Channel DeviceDVQM
ApplicationExamples
SampleMeasurements
Conclusions
The whole Quality Analysis ProcessMasking of perception of quality degradations by high spatial (SA) & temporal (TA) activity values
MPEG2 TSorITU-R 601
DVQL-W
Processpart #1
Processpart #2
“Weighting”
Adaptation to subj.
perception0 2 4 6 8 10 12 14 16 18 20 22 24 26
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AD(i=0)
AD(i=1)
AD(i=2)
AD(i=3)
AD(i=4)
AD(i=5)
AD(i=6)
AD(i=7)
AD(i=8)
AD(i=9)
AD(i=10)AD(i=11)
AD(i=12)
AD(i=13)
AD(i=14)
AD(i=15)
SSCQE scaling
TASA
DVQL-U (Y)DVQL-U (Cb)DVQL-U (Cr)
DIGITAL VIDEO QUALITY ANALYZERS DVQ / DVQMRSA | OCT/03/2001 | 10
Overview &Abstracts
Video QualityEvaluation Basics
Theory of the IfN/R&S Algorithm
Single Channel Instrument DVQ
Multi Channel DeviceDVQM
ApplicationExamples
SampleMeasurements
Conclusions
SSCQE acc. ITU-R B.T.500-7Test persons watching sequence (Single Stimulus)
Continuous Quality Evaluation with slider movements while watching
Value sampling and averaging over viewers
DIGITAL VIDEO QUALITY ANALYZERS DVQ / DVQMRSA | OCT/03/2001 | 11
Overview &Abstracts
Video QualityEvaluation Basics
Theory of the IfN/R&S Algorithm
Single Channel Instrument DVQ
Multi Channel DeviceDVQM
ApplicationExamples
SampleMeasurements
Conclusions
Comparison with Subjective Values (I)
time [sec]
Digital VideoQuality Level- weighted
0 50 100 150 200 250 300 350 400 450-10
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50
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70
80
90
100 Subjective Valuation
DVQL-W by DVQ
Video Test SequenceSSCQE Scaling
DIGITAL VIDEO QUALITY ANALYZERS DVQ / DVQMRSA | OCT/03/2001 | 12
Overview &Abstracts
Video QualityEvaluation Basics
Theory of the IfN/R&S Algorithm
Single Channel Instrument DVQ
Multi Channel DeviceDVQM
ApplicationExamples
SampleMeasurements
Conclusions
Comparison with Subjective Values (II) Correlation of 82.79% with Version 2.0 of the algorithm
y = -0,4484x + 95,014R2 = 0,6854r = 82,79%
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100
0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00
Subjective Scoring
DV
QL-
WAll
Tree
Barcelona
Harp
MovingGraphic
CanoaValsesia
F1car
Fries
HoriScrolling
Rugby
MobileCalendar
BalloonPops
NewYork2
525_MobileCalendar
Betes_pas_betes
Le_point
AutumnLeaves
Football
Sailboat
Susie
Tempete
Linear (All)
Linear (All)
DIGITAL VIDEO QUALITY ANALYZERS DVQ / DVQMRSA | OCT/03/2001 | 13
Overview &Abstracts
Video QualityEvaluation Basics
Theory of the IfN/R&S Algorithm
Single Channel Instrument DVQ
Multi Channel DeviceDVQM
ApplicationExamples
SampleMeasurements
Conclusions
Quality analysis without reference
Real time operation
Integrated MPEG2 decoder (incl. 422 profile)
Referenced measurements possible
Detection of basic distortions
u Picture freeze and loss
u Sound loss (right / left separately)
Key Features of DVQ & DVQM
Transport StreamDUT
DIGITAL VIDEO QUALITY ANALYZERS DVQ / DVQMRSA | OCT/03/2001 | 14
Overview &Abstracts
Video QualityEvaluation Basics
Theory of the IfN/R&S Algorithm
Single Channel Instrument DVQ
Multi Channel DeviceDVQM
ApplicationExamples
SampleMeasurements
Conclusions
Characteristics of the Basic Unit
Result Output4 LC display [bars/histogram/long time]
4 OS display inside decoded video
4 Integrated long-term statistics
4 Detailed event & error report
4 Relay outputs
Signal Inputs4 Transport stream inputs:
- DVB-ASI & -SPI/LVDS- SMPTE310M optional [DV-B310]
4 SDI serial plus AES/EBU[ITU-R B.T.601 or SMPTE259E]
4 CA descrambling optional[DVQ-B10/11/12/15/16]
Control Interfaces4 Network
[TCP/IP & SNMP]
4 Serial [RS232]
4 12 Alarm closures
4 Printer [Parallel]
DIGITAL VIDEO QUALITY ANALYZERS DVQ / DVQMRSA | OCT/03/2001 | 15
Overview &Abstracts
Video QualityEvaluation Basics
Theory of the IfN/R&S Algorithm
Single Channel Instrument DVQ
Multi Channel DeviceDVQM
ApplicationExamples
SampleMeasurements
Conclusions
Block Diagram / In- & Outputs
AES/EBU (dig. audio)
SDI / ITU-R 601
TS DVB-SPI (parallel)
TS DVB-ASI (serial) x2
TS DVB-ASIscrambled (opt.)
OptionDescramblingDVQ-B11,12,..
Audio L analog
Audio R analog
RS232
Ethernet 10BaseT
Relay outputs x12
Composite
AES/EBU
SDI / ITU-R 601
Printer parallel
LC/OS-Display
MPEG2Decoder
QualityAnalysis
PAL/NTSC& AudioEncoderTS SMPTE310M (opt.)
DIGITAL VIDEO QUALITY ANALYZERS DVQ / DVQMRSA | OCT/03/2001 | 16
Overview &Abstracts
Video QualityEvaluation Basics
Theory of the IfN/R&S Algorithm
Single Channel Instrument DVQ
Multi Channel DeviceDVQM
ApplicationExamples
SampleMeasurements
Conclusions
Referenced MeasurementQuality analysis for two signalsu MPEG2-TS vs. SDI
u SDI vs. MPEG2-TS
Comparing evaluation of artefactsu No comparison of pictures !
u Difference of single quality values,
subjectively weighted
u Evaluation of quality differences
Separate detection of distortionsu Picture freeze & loss
u Sound loss (right / left)
Propagation delay u max. ± 5 s
u automatic detection from typical signal
characteristics
TA / SA -Calculation
Inputs„INP“ „REF“
DVQL-WWeighting
Quality values (absolute) orQuality differences (relative)
AD(i) -Calculation
TA / SACalculation
AD(i) -Calculation
Mode“REF”
Mode“INP”
Detection ofDistortions
Detection ofDistortions
DIGITAL VIDEO QUALITY ANALYZERS DVQ / DVQMRSA | OCT/03/2001 | 17
Overview &Abstracts
Video QualityEvaluation Basics
Theory of the IfN/R&S Algorithm
Single Channel Instrument DVQ
Multi Channel DeviceDVQM
ApplicationExamples
SampleMeasurements
Conclusions
Multiplex Scan ModeSequential check of all programs
contained in one transport streamu No Scanning of multiple TS !
Variable duration per program
Program selectionu Automatic all
u Manual choice
Limits for TA / SA / DVQL-Wu Adjustable per program
Indication of distortionsu Immediately or
u After 1...5 detections in subsequent scan cycles
Status display of resultsu All programs in one clear view
DIGITAL VIDEO QUALITY ANALYZERS DVQ / DVQMRSA | OCT/03/2001 | 18
Overview &Abstracts
Video QualityEvaluation Basics
Theory of the IfN/R&S Algorithm
Single Channel Instrument DVQ
Multi Channel DeviceDVQM
ApplicationExamples
SampleMeasurements
Conclusions
MonitoringDetailsu Freeze frames
u Picture outages
u Sound outagesu Video quality profile
Benefitsu 24 hour real time
u Without operator
u Quality assuranceu Network optimization
u Fault identification
Transport StreamDUT
time
Digital VideoQuality Level
-7 -6 -5 -4 -3 -2 -1 0
Threshold
Picture Freeze
DVQ
DIGITAL VIDEO QUALITY ANALYZERS DVQ / DVQMRSA | OCT/03/2001 | 19
Overview &Abstracts
Video QualityEvaluation Basics
Theory of the IfN/R&S Algorithm
Single Channel Instrument DVQ
Multi Channel DeviceDVQM
ApplicationExamples
SampleMeasurements
Conclusions
Quality Explorer Software DVQ-B1Functionsu Video ES analysis
u Offline or on-line
Benefitsu Detailed coding analysisu Network valuation
u Equipment valuation
Transport StreamDUT
QualityExplorer™
DVQ
QuantificationFactors/Tables
Video ESOrganization
Macro blockData
MotionVectors
QualityStatistics
DIGITAL VIDEO QUALITY ANALYZERS DVQ / DVQMRSA | OCT/03/2001 | 20
Overview &Abstracts
Video QualityEvaluation Basics
Theory of the IfN/R&S Algorithm
Single Channel Instrument DVQ
Multi Channel DeviceDVQM
ApplicationExamples
SampleMeasurements
Conclusions
Options for CA DescramblingMain characteristics
u One descrambling board per DVQ
u Separate DVB-ASI interface 45 Mbit/s
u Smart card reader included
u Smart card not supplied
u Product designation DVQ-B10/11/12/15/16
CA systems supported
u Conax - Nagravision - Viaccess (one board)
u Irdeto
u Mediaguard
u NDS-Videoguard (BSkyB)
u BetaCrypt
u Philips Cryptoworks
DIGITAL VIDEO QUALITY ANALYZERS DVQ / DVQMRSA | OCT/03/2001 | 21
Overview &Abstracts
Video QualityEvaluation Basics
Theory of the IfN/R&S Algorithm
Single Channel Instrument DVQ
Multi Channel DeviceDVQM
ApplicationExamples
SampleMeasurements
Conclusions
Multi Channel Quality Analyzer DVQMOfficial introduction NAB 2001
Broadcast Engineering Pick-Hit Award 2001
8 RU 19” wide - 12 slots
Modules available
u Quality board (DVQ like)
u CA descrambling options
Remote operation
u TCP/IP & SNMP protocols
Actual customer reference
u SES-Astra, Luxembourg
Europe’s largest satellite operator
DIGITAL VIDEO QUALITY ANALYZERS DVQ / DVQMRSA | OCT/03/2001 | 22
Overview &Abstracts
Video QualityEvaluation Basics
Theory of the IfN/R&S Algorithm
Single Channel Instrument DVQ
Multi Channel DeviceDVQM
ApplicationExamples
SampleMeasurements
Conclusions
Main Features of DVQM
Up to 12 totally independent processing cards
Same characteristics as DVQ
u Real time quality analysis
u No reference signal
u Freeze frame, video & audio outage detection
u Internal error report
u TS input, SDI 601 input
u MPEG2 decoder included, composite outputs
u Scan mode available
u TCP/IP & SNMP connectivity
Monitoring software “NetView”
DIGITAL VIDEO QUALITY ANALYZERS DVQ / DVQMRSA | OCT/03/2001 | 23
Overview &Abstracts
Video QualityEvaluation Basics
Theory of the IfN/R&S Algorithm
Single Channel Instrument DVQ
Multi Channel DeviceDVQM
ApplicationExamples
SampleMeasurements
Conclusions
DTV NetView - Statistics
DIGITAL VIDEO QUALITY ANALYZERS DVQ / DVQMRSA | OCT/03/2001 | 24
Overview &Abstracts
Video QualityEvaluation Basics
Theory of the IfN/R&S Algorithm
Single Channel Instrument DVQ
Multi Channel DeviceDVQM
ApplicationExamples
SampleMeasurements
Conclusions
DTV NetView - Error Report
DIGITAL VIDEO QUALITY ANALYZERS DVQ / DVQMRSA | OCT/03/2001 | 25
Overview &Abstracts
Video QualityEvaluation Basics
Theory of the IfN/R&S Algorithm
Single Channel Instrument DVQ
Multi Channel DeviceDVQM
ApplicationExamples
SampleMeasurements
Conclusions
Application 1 - Network Monitoring
NetworkAdapter
SourceTS
SDH - PDH (- ATM)Network
NetworkAdapter
NetworkAdapter
Destination
NetworkAdapter
TS
TS
DVG TS
• Functional test
• Network design
• Network optimizationDVQ
DVQ
DIGITAL VIDEO QUALITY ANALYZERS DVQ / DVQMRSA | OCT/03/2001 | 26
Overview &Abstracts
Video QualityEvaluation Basics
Theory of the IfN/R&S Algorithm
Single Channel Instrument DVQ
Multi Channel DeviceDVQM
ApplicationExamples
SampleMeasurements
Conclusions
Transmission bandwidth / data rate optimization
• For
– Encoder
– Statistical Multiplexer
• Data rate minimization
• Quality assurance
Ü Minimum data rate forconstant quality level
Ü Long-term measurement withreal live program materialinstead of short test sequences
Application 2 - Process Control
DVQL
time
TS
MUX
MPEG-2Encoder
DVQ
TS
TS
TS
DVQL-W
control
control
DIGITAL VIDEO QUALITY ANALYZERS DVQ / DVQMRSA | OCT/03/2001 | 27
Overview &Abstracts
Video QualityEvaluation Basics
Theory of the IfN/R&S Algorithm
Single Channel Instrument DVQ
Multi Channel DeviceDVQM
ApplicationExamples
SampleMeasurements
Conclusions
Application 3 - Detailed Fault Analysis
Functionl Picture quality decreases
l DVRG receives trigger
l DVRG records the faulty signal before and after the trigger
l Further offline in depth analysis
Benefitsl Fault tracing
l Fault verification
l Network optimization
Trigger
Transport StreamDUT
DVRG
DVRM
DVQ
Stream QualityExplorer Explorer
DIGITAL VIDEO QUALITY ANALYZERS DVQ / DVQMRSA | OCT/03/2001 | 28
Overview &Abstracts
Video QualityEvaluation Basics
Theory of the IfN/R&S Algorithm
Single Channel Instrument DVQ
Multi Channel DeviceDVQM
ApplicationExamples
SampleMeasurements
Conclusions
Application 4 - Satellite Monitoring
QPSK
SatelliteReceiver(s)
• Automated monitoring
• Quality assurance
Uplink
TS’s
Multiple Quality Monitoring by DVQMplus optional Protocol Monitoring with
multiple DVRM’s
IRDIRDIRDIRD7
DIGITAL VIDEO QUALITY ANALYZERS DVQ / DVQMRSA | OCT/03/2001 | 29
Overview &Abstracts
Video QualityEvaluation Basics
Theory of the IfN/R&S Algorithm
Single Channel Instrument DVQ
Multi Channel DeviceDVQM
ApplicationExamples
SampleMeasurements
Conclusions
Application 5 - Playout CenterQuality control on
• Inputs
• Encoding
• Outputs
MUX
VideoServer
MPEG-2Encoder
Output
MPEG-2Encoder
TS
InputDVQM
DIGITAL VIDEO QUALITY ANALYZERS DVQ / DVQMRSA | OCT/03/2001 | 30
Overview &Abstracts
Video QualityEvaluation Basics
Theory of the IfN/R&S Algorithm
Single Channel Instrument DVQ
Multi Channel DeviceDVQM
ApplicationExamples
SampleMeasurements
Conclusions
Site: Berlin, Germany
Play out centre Winterfeldstraße
Identical parallel structure
u Constant MUX
u Statistical MUX
3 or 4 live programs
Configurations
u 3 x 3.5 Mbit/s (Video 3.2 Mbit/s)
u 4 x 3.5 Mbit/s (Video 3.2 Mbit/s)
u 3 x 4.7 Mbit/s (Video 4.4 Mbit/s)
Average data rate with stat. MUX identical to constant data rate
Encoder and multiplexer fromsame supplier
Performed by T-Nova Berkom, Deutsche Telekom
Sample Measurements
DVQ
TS (stat.)
ACD
ACD
ACD
ACD
MUXV
CD
VCD
VCD
VCD
A3
V3
A2
V2
A1
V1
A4
V4
DVQ
TS (const.)
Constant Multiplex
ACD
ACD
ACD
ACD
MUXV
CD
VCD
VCD
VCD
A1
V1
A4
V4
A3
V3
A2
V2
Statistical Multiplex
With courtesy ofT- Nova Berkom
DIGITAL VIDEO QUALITY ANALYZERS DVQ / DVQMRSA | OCT/03/2001 | 31
Overview &Abstracts
Video QualityEvaluation Basics
Theory of the IfN/R&S Algorithm
Single Channel Instrument DVQ
Multi Channel DeviceDVQM
ApplicationExamples
SampleMeasurements
Conclusions
Comparison of Statistical vs. Constant MUXProgram: ORB, 7.12.99, 19:00 - 19:06 h
Stat.. and const. MUX, 4x3,5 Mbit/s
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Time
Qu
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y va
lue
DV
QL
-W
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a ra
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Mb
it/s
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VidQu stat VidQu const Data rate stat Data rate const
With courtesy ofT- Nova Berkom
DIGITAL VIDEO QUALITY ANALYZERS DVQ / DVQMRSA | OCT/03/2001 | 32
Overview &Abstracts
Video QualityEvaluation Basics
Theory of the IfN/R&S Algorithm
Single Channel Instrument DVQ
Multi Channel DeviceDVQM
ApplicationExamples
SampleMeasurements
Conclusions
Average Picture QualityEach with constant and statistical MUX
0
10
20
30
40
50
60
70
80
3x3.5 Mbit/s 4x3.5 Mbit/s 3x4.7 Mbit/s
Configuration
Qu
alit
y va
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DV
QL
-W
ARD (const.)
ARD (stat.)Eurosport (const.)
Eurosport (stat.)
MTV (const.)
MTV (stat.)
ORB (const.)ORB (stat.)
With courtesy ofT- Nova Berkom
DIGITAL VIDEO QUALITY ANALYZERS DVQ / DVQMRSA | OCT/03/2001 | 33
Overview &Abstracts
Video QualityEvaluation Basics
Theory of the IfN/R&S Algorithm
Single Channel Instrument DVQ
Multi Channel DeviceDVQM
ApplicationExamples
SampleMeasurements
Conclusions
Hitting a low Quality LimitFrequency of hitting the quality limit “DVQL-W=20”
with constant and statistical MUX
0
1
2
3
4
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7
8
9
3x3.5 Mbit/s 4x3.5 Mbit/s 3x4.7 Mbit/s
Configuration
Sec
on
ds
per
ho
ur ARD (const.)
ARD (stat.)Eurosport (const.)Eurosport (stat.)MTV (const.)MTV (stat.)ORB (const.)ORB (stat.)
With courtesy ofT- Nova Berkom
DIGITAL VIDEO QUALITY ANALYZERS DVQ / DVQMRSA | OCT/03/2001 | 34
Overview &Abstracts
Video QualityEvaluation Basics
Theory of the IfN/R&S Algorithm
Single Channel Instrument DVQ
Multi Channel DeviceDVQM
ApplicationExamples
SampleMeasurements
Conclusions
Quality Distribution with 4 x 3.5 Mbit/s
Quality value DVQL-WValues: Ø ó nconst. 56.4 10.37 24448stat. 61.2 8.39 24440
const.stat.
0
200
400
600
800
1000
1200
1400
0 20 40 60 80 100
Nu
mb
er
With courtesy ofT- Nova Berkom
DIGITAL VIDEO QUALITY ANALYZERS DVQ / DVQMRSA | OCT/03/2001 | 35
Overview &Abstracts
Video QualityEvaluation Basics
Theory of the IfN/R&S Algorithm
Single Channel Instrument DVQ
Multi Channel DeviceDVQM
ApplicationExamples
SampleMeasurements
Conclusions
Quality Distribution with 3 x 4.7 Mbit/s
Quality value DVQL-W Values: Ø ó nconst. 62,8 9,55 24454stat. 64,8 9,38 24430
const.stat.
0
200
400
600
800
1000
1200
1400
0 20 40 60 80 100
Nu
mb
ers
With courtesy ofT- Nova Berkom
DIGITAL VIDEO QUALITY ANALYZERS DVQ / DVQMRSA | OCT/03/2001 | 36
Overview &Abstracts
Video QualityEvaluation Basics
Theory of the IfN/R&S Algorithm
Single Channel Instrument DVQ
Multi Channel DeviceDVQM
ApplicationExamples
SampleMeasurements
Conclusions
Ø 4,1 5,0ó 0,52 0,59n 24439 24429
3 3.5 4 4.5 5 5.5 6 6.5 7
Distribution of Data Rates in Stat. MUX4 x 3.5 Mbit/s
2 2.5 3 3.5 4 4.5 5 5.5 6
3 x 4.7 Mbit/s
With courtesy ofT- Nova Berkom
DIGITAL VIDEO QUALITY ANALYZERS DVQ / DVQMRSA | OCT/03/2001 | 37
Overview &Abstracts
Video QualityEvaluation Basics
Theory of the IfN/R&S Algorithm
Single Channel Instrument DVQ
Multi Channel DeviceDVQM
ApplicationExamples
SampleMeasurements
Conclusions
Conclusions for DVQ & DVQMVideo quality measurements
Due to subjective perception
Objective & reproducible
Real time process
No reference signal required
Typical video material
MPEG2 decoder included
Optional CA descrambling
EMMY award 2000
DIGITAL VIDEO QUALITY ANALYZERS DVQ / DVQMRSA | OCT/03/2001 | 38
Overview &Abstracts
Video QualityEvaluation Basics
Theory of the IfN/R&S Algorithm
Single Channel Instrument DVQ
Multi Channel DeviceDVQM
ApplicationExamples
SampleMeasurements
Conclusions
Contact Info
Coordinates % +1 - 410 - 910 - 7836 (EDT time zone)
Fx +1 - 410 - 910 - 7801
) Alexander.Woerner @ rsa.rohde-schwarz.com
Web http://www.rohde-schwarz.com