[SOLVED] CS CS4551

Multimedia Software Systems CS4551
Video Compression Latest Standards
CSULA CS4551 Multimedia Software Systems by Eun-Young Kang
H.26x vs. MPEG

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SamecompressionprincipleinH.26xandMPEG
Differenttargetedapplications
MPEG: in various entertainment applications
MPEG-1 : Storage of video/audio on CD-ROMS (VCD) MPEG-2: DVD, digital video broadcasting
MPEG-4: general interactive multimedia applications
H.26x: use in various type of network including PSTN, ISDN, LAN, and wireless transmission
H.261: Video telephony and video conference over ISDN
H.263: Video application across PSTN and wireless networks (very low bit rate)
H.264: Targeted at 3G mobile networks and broadcast CSULA CS451 Multimedia Software Systems by Eun-Young Kang

CSULA CS451 Multimedia Software Systems by Eun-Young Kang
Mode selection
H.264 Codec
Control Data
Quant. Transf. coeffs
Reference frame
Motion Data
From Dr. Wiegands notes
CSULA CS451 Multimedia Software Systems by Eun-Young Kang

Transform/ Quantizer
Intra/Inter
Deq./Inv. Transform
Motion- Compensated Predictor
Entropy Coding
Motion Estimator

CSULA CS451 Multimedia Software Systems by Eun-Young Kang
H.265 Codec
H.264/265 Distinguished Features (1)
Variableblock-sizeMotionCompensation HighlyaccurateMotionCompensation
MultipleReferenceFrames
Context-basedAdaptiveCoding
CodingUnit
H.264: 1616 (Macroblock)
H.265: 6464 with hierarchical partition
CSULA CS451 Multimedia Software Systems by Eun-Young Kang

H.264/265 Distinguished Features (2)
Integer-basedtransformandquantization
Advancedintrapredictionmodes
H.264 9 directional, DC, planar H.265 33 directional
Efficientinter-predictionmodes P_SKIP and B_DIRECT
CSULA CS451 Multimedia Software Systems by Eun-Young Kang
Variable Block Size MC H.264
Partition to variable block sizes down to 44 16
CSULA CS451 Multimedia Software Systems by Eun-Young Kang

Variable Block Size MC H.265
Asymmetric prediction units
CSULA CS451 Multimedia Software Systems by Eun-Young Kang
Sub-pixel Motion Estimation closer matching blockbetter compression
Integer position pixel 1/8 pixels
1/2 and 1/4 pixels
CSULA CS451 Multimedia Software Systems by Eun-Young Kang

Multiple reference frames
CSULA CS451 Multimedia Software Systems by Eun-Young Kang
Context-based Adaptive Coding
Disadvantages for entropy coding in MPEG-2/H.263 Static probability distribution not resemble the real case Correlation between symbols are ignored
Codeword must have integer number of bit
For the context-based adaptive coding
Use dynamical probability model
Exploiting symbol correlations using context
Fraction of bits is possible using arithmetic coding H.265 enables parallel encoding
CSULA CS451 Multimedia Software Systems by Eun-Young Kang

Comparison: H.264 vs. MPEG4
CSULA CS451 Multimedia Software Systems by Eun-Young Kang
Comparison: H.264 vs. H.265
CSULA CS451 Multimedia Software Systems by Eun-Young Kang

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