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Digital Videotechnology 1. Basics a. Analog Video b. Composite, S-Video, Component 2. Digital Video 1. Sampling 2. Compression 3. Digital Camera 4. DV Format 5. Digital TV

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Page 1: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

Digital Videotechnology

1. Basicsa. Analog Videob. Composite, S-Video, Component

2. Digital Video1. Sampling2. Compression

3. Digital Camera4. DV Format5. Digital TV

Page 2: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

Videotechnology: Actual Situation

Studio

Digital Videocompressed MPEG 2Modulated QPSK

Cable Digital64 QAM

Set Top Box

Cable analog

Direct Satellitereceiver

Analog VideoTerrestricalDistribution

Digital VideoTerrestricalOFDM

Page 3: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

Introduction to Videotechnology

TV Systems (analog)

Germany, Austria, Poland ...PAL: Phase Alternate Line625 (576 active) Lines, 50 Hz Interlace aspect ratio 4:3

USA, Japan, latin AmericaNTSC: 525 Lines (480 active) 60 Hz Interlaceaspect ratio 4:3

Page 4: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

1.Field 2.FieldFrame

Introduction to Videotechnology

= +

Interlace

Page 5: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

Introduction to Videotechnology

Interlace

• progressive

• interlaced

Page 6: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

Camera CRT or Display

Principle of Videotransmission (analog)

Page 7: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

t

V

0.7

Luminance Distribution in one line

Page 8: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

Different Screen Format

Introduction to Videotechnology

Page 9: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

The Composite Signal

How to transmit Color ?

Page 10: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

The Colorcompositing

Additive Colorcompositing Subtractive Colorcompositing

Displays, CRT Print (Paper)

RGB CMYK

Page 11: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

Y Luminance

Cr = R-Y

Cb = B-Y

In the Videotechnology people areworking with Component Signals

Y=0.299R+0,587G+0.114B

Page 12: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

Matrix

R

G

B

Y

Cr

Cb QAMChrominace

Videosignal(Composite)

Luminance

C

Component signal

Different Video Signals

S-VideosignalY/C -Signal

Introduction to Videotechnology

Page 13: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

The Component Signal

Y=0.299R+0,587G+0.114B

Generation of Luminance signal from RGB

100 % intensityRed

kamera 100 % Intensity

100 % IntensitätRot

B/W Kamera 30% Intensity

Page 14: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

The Component Signal

Y=0.299R+0,587G+0.114B

Generation of Luminance signal from RGB

100 % IntensityGreen

kamera 100 % Intensity

100 % IntensityGreen

B/W Kamera 59% Intensity

Page 15: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

The Component Signal

Y=0.299R+0,587G+0.114B

Generation of Luminance signal from RGB

100 % IntensityBlue

kamera 100 % Intensity

100 % IntensityBlue

B/W Kamera 11% Intensity

Page 16: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

Wei

ß Gel

b Cya

n Grü

n Mag

en

da Ro

t

Bla

u Sch

war

z

The Colorbar

How we can explain color bar with RGB ?

Task

Page 17: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

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Page 18: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

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end

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0,891

0,70,59

0,410,3

0,11

Page 19: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

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Y

YBU

YRU

Page 20: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

Die Chrominanz

QAM: Quadratur Amplitude Modulation

Principle of QAM:

• (R-Y,B-Y) is a vector with angle and lenght :V=0,877(R-Y) und U=0,493(B-Y)

• (U,V)(C,Φ)mit

22 VUC U

V)tan(

Page 21: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

QAM: Quadrature Amplitude Modulation

)sin( tU stc

22 UVU c

)arctan( UV

Page 22: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

Composite Signal

)sin()( tUtU stc

22 UVU c

)arctan( UV

Saturation

Hue

Page 23: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

Farbkreis

Page 24: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

Farbkreis

Page 25: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

Farbkreis

Page 26: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

Introduction to Videotechnology

TV Systems (digital)

SDTV HDTV Digitale Filmkamera

Pixel 720 x 576 1920 x 1080 4096 x 3072

Size for Luminance

0,4 MegaPixel 2,0 MegaPixel 12 MegaPixel

Quantisierung 8 Bit 10 Bit 14 Bit

Sampling 4:2:2 /Y,Cr,Cb 4:2:2 /Y,Cr, Cb 4:4:4/RGB

Datarate 25fps 125 MBit/s 1,485 GBit/s 17,3 Gbit/s

Page 27: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

Digital Component Signal

Y, Cr,Cb

•Die Components are digitized

•Quantisation with 10 Bit

Die Norm CCIR 601 4:2:2

Y: Digitalization with 13,5 MHzCr: Digitalization with 6,75 MHzCb: Digitalization with 6,75 MHz

Page 28: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

Digital Component Signal

3,375 MHz

4

13,5 MHz

Basic frequency

2

6,75 MHz

Page 29: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

Digital Component Signal

Sampling and Quantisation of Component CCIR 601

• Sampling 4:2:2 and Quantisation with 10 Bit

• Datarate 270 Mbit/s

• 1 hour Video material ca. 122 Gbyte

Page 30: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

Sampling 4:2:2

Zeile 1

Zeile 2

Zeile 3

Zeile 4

Zeile 5

Zeile 6

Page 31: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital
Page 32: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

4:1:1

Zeile 1

Zeile 2

Zeile 3

Zeile 4

Zeile 5

Zeile 6

Digital Component Signal

Page 33: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

DV - Format

Page 34: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

576

720

Digital Videoformat

Digitalization of Videosignals

Page 35: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

1 Frame

1 Sekunde

2 Frames 3 Frames 25 Frames

How big is the data rate ?

What is the memory amount for storing 1 hour Video ?

Digitalization of Videosignals

Page 36: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

DV Format MPEG 2 Standard

DVD

DVBDigital Video Broadcasting

Camcorder

Digitalization of Videosignals

Page 37: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

• DV- Format was establish by Consortium of

the leading Broadcast Companies

(Sony, Thomson, Panasonic, Philips)

• Standard since 1994

• Applications: Recording Video im consumer field

• Compression algoritm is optimized of constant Byte/Frame

Intraframe Codierung /DV Format

Page 38: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

• Resolution: 720*576 /25Hz (Luminanz)

• Sampling 4:2:0 und Quantization 8 Bit

• Input data rate : ca 125 Mbit/s

• Compression 5:1 ; Discrete Cosinus Transformation DCT

• Constant Outputdata rate: 25 Mbit/s

Intraframe Codierung /DV Format

Page 39: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

Matrix

R

G

B

Y

Cr

Cb

Sampling(4:2:0)

& Quantization

125 Mbit/s

Y Cr Cb

Intraframe Coding /DV Format

Preprocessing

Page 40: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

Zeile 1

Zeile 2

Zeile 3

Zeile 4

Zeile 5

Zeile 6

Intraframe Codierung /DV Format

Digitalization of Videosignals 4:2:0 Grid

Page 41: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

Huffman-Codierer

011010101

DCTTransformation

Huffman-Decodierer

Inverse-Transformation

TresholdCoeffizients with small Energy

are omitted

Intraframe Codierung /DV Format

DV Compression: DCT Transformation

Page 42: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

185 191 204 62

98 110 116 112

101 108 104 106

100 99 97 101

A00A04

273,6 111,8 12,1 1,6

94,1 74,2 -3,8 1,2

-1,4 0,4 0,3 -0,6

0,5 0,7 0,2 0,125

274 11 0 0

9 7 0 0

0 0 0 0

0 0 0 0

17

DCT

Tresholdweighting & Quantization

DV (JPEG) : CodierungMuster der 2 dimensionalen DCT

Intraframe Codierung /DV Format

Page 43: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

274 112 0 0

94 74 0 0

0 0 0 0

0 0 0 0

274, 112, 94, 0, 74, 0, 0, 0, 0, 0 ,0 ,0 ,0 ,0 ,0 ,0

274, 112, 94, 0, 74, 0, ! ,11RLE Coding

Coeffizienten Matrix

Intraframe Coding/DV Standard

Zig Zag Process

Page 44: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

Zig Zag Process

Block 1Block 2Block N

Huffman Codierung

DPCM

RLE

DC

011010101

Intraframe Codierung/DV Standard

Page 45: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

Exsample of DV Compressions

Intraframe Codierung/DV Standard

Rekonstruktion 26,6 KBOriginal 133,5 KB

Compression 1:5

Page 46: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

Examples of DV Compression

Intraframe Coding/DV Standard

Reconstruktion 26,6 KBOriginal 133,5 KB

Compression 1:5

Page 47: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

Examples of DV Compression

Intraframe Coding/DV Standard

Rekonstruktion 3,8 KBOriginal 133,5 KB

Kompression 1:35

Page 48: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

Examples of DV Compression

Intraframe Coding/DV Standard

Rekonstruktion 2,26 KBOriginal 133,5 KB

Compression 1:60

Page 49: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

DV Format

Intraframe Verarbeitung, Block shuffling

• 5 Makroblöcke aus unterschiedlichen Bereichen des Bildes werdenzu einem Videosegment zusammengefasst 1 Videosegment =5*384Bytes=1920 Bytes

• 1 Frame 324 Videosegmente

• Block Shuffling bewirkt gleichmäßige Verteilung der Kompressionseffekte

M1M2

M5M3

M4

IntraframeMacroblock-

Shuffling

M1 M2 M3 M4 M5

1 Videosegment1920 Bytes

Page 50: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

Intraframe Processing, Block shuffling

• Bilding Makroblocks

• 1 Makroblock contain 6 DCT Blocks (8*8 or 2*4*8 Blocks)

• The Size of Makroblocks is 6*8*8 Byte=384 Bytes

• 1 Makroblock contain 4 Luminance and 2 Crominanzblocks

Intraframe Codierung/DV Standard

Page 51: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

Makroblocks

• 1 Makroblock contains 6 DCT Blöcke (8*8 Blöcke)

• 1 Makroblock : 4 Luminance and 2 Crominance

• The Size of the Makroblocks ist6*8*8 Byte=384 Bytes

Intraframe Codierung/DV Standard

1 2 3 4 5 6

Y Cr Cb

Page 52: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

4:2:0

Y Cr Cb

Intraframe-Block Shuffling

DCT Buffer Quanti-sierung VCL

Analyse

feste Videodatenrate25 Mbit/s

Feed Forward Steuerung

Intraframe Codierung/DV Standard

Videoblock

Page 53: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

DV Format

Verschiedene Herstellerformate

DV DVCAM DVCPro DVCPro50

Y-Bandbreite 5,75 MHz 5,75 MHz 5,75 MHz 5,75 MHz

C-Bandbreite 2,75 MHz 2,75 MHz 1,37 MHz 2,75 MHz

Pegelauflösung 8 bit 8 bit 8 bit 8 bit

Abtastraster 4:2:0 4:2:0 4:1:1 4:2:2

Signal/Rausch-abstand

>56dB >56dB >56dB >56dB

Datenreduktionsfaktor 5:1 5:1 5:1 3,3:1

Aufzeichnungsrate 42 Mbit/s 42 Mbit/s 42 Mbit/s 84 Mbit/s

Videodatenrate 25 Mbit/s 25 Mbit/s 25 Mbit/s 50 Mbit/s

Anzahl der Zeilen/Halbbild

288 288 288 288

Anzahl der Audio Kanäle

2/4 2/4 2 4

Page 54: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

Artefakte bei DV

•Durch Farbreduktion 3 Probleme:

1.Mosquito Noise

2.Quilting (Diskontinuität benachbarter DCT-Blöcke)

3.Motion Blocking

Page 55: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

Artefakte bei DV

• Mosquito Noise

Page 56: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

Artefakte bei DV

• Quilting beihorizontalen Linien

Page 57: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

Artefakte bei DV

• Motion Blocking

Page 58: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

Artefakte bei DV

• Dropout

Page 59: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

Artefakte bei DV

• Dropout

Page 60: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

MPEG Moving Pictures Expert Group

• 1988 gegründet

• Ziel: Normierung von Kodiervorgängen für Bewegtbilder unddazugehörigen Tonsignalen

• Offener Standard

• Zur Zeit bereits standardisiert: MPEG1, MPEG2, MPEG4

• In der Planung MPEG7, MPEG21

Page 61: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

MPEG Moving Pictures Expert Group

• MPEG Algorithmus basiert auf Hybride DCT

eine Kombination von DPCM und DCT

• Bei der DPCM wird die closed loop DPCM verwendet

Page 62: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

+

P

Huffmancoder

Huffmandecoder

iS

1iS

–iS

+p

iS

1iS

+

Open-Loop DPCM

iS

1iSSchätzwert

Diiferenzwert

1 iii SSS

Rekonstruktionswert

1 iii SSS

MPEG Moving Pictures Expert Group

Page 63: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

Huffmancoder

Huffmandecoder

Methoden der Bildcodierung

Close-Loop DPCM

+p

iS + iS

+

P

iS

1 iS

–Q

+

iS+

1'iS

Q

1 iS

Page 64: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

aktuelles Bild vorhergehendes Bild

Differenz

Methoden der Bildcodierung

Interframe DPCM

Page 65: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

aktuelles Bild

vorhergehendes Bild

Bewegungsschätzung und

kompensation

BK Bild

Bewegungsvektor

vorhergehendes Bild

BK Bild

Bewegungsschätzung und

kompensation

Diff. Bild Diff. Bild

Methoden der Bildcodierung

Interframe DPCMEncoder Decoder

Page 66: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

MPEG Moving Pictures Expert Group

DCT

Q

DCT

Q

DCT

Q

DCT

Q

P P P P

Page 67: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

MPEG Moving Pictures Expert Group

DCT

Q

B

Page 68: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

GOP Group of Picture

Page 69: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

B- Frames

Page 70: Digital Videotechnology 1.Basics a.Analog Video b.Composite, S-Video, Component 2.Digital Video 1.Sampling 2.Compression 3.Digital Camera 4.DV Format 5.Digital

Profiles & Levels MPEG 2