Scalable Video Scalable Video Bishoy Gamil Stefanos Outline - - PowerPoint PPT Presentation

Scalable Video Scalable Video

Bishoy Gamil Stefanos

Outline Outline

• Introduction

Introduction

• Main Characteristic

bl

• Problem
• Future Work
• References

Introduction Introduction

• Video Quality served to an IPod is different

Video Quality served to an IPod is different than that of a PC.

• Video Quality (Size) should adapt with

Video Quality (Size) should adapt with network conditions.

• High Quality video contains a subset

High Quality video contains a subset bitstreams

• The Video could reconstructed using these

The Video could reconstructed using these subsets based on the requirements

• Quality depends on how many subsets are

Quality depends on how many subsets are used.

Main Characteristic Main Characteristic

• Encoding

Encoding

• Encoding Decision

d bil

• Adaptabilty
• Transmission
• Decoding

MPEG MPEG

• Use of standard size blocks 8x8 (MacroBlocks)
• DCT (Discrete Cosine Transformation)

‐ Controlling what frequency to send ‐ Decreasing Redundancy ‐ Decreasing Redundancy

• Frame predictability

‐ Intra‐Coded Picture (Anchor) ‐ P Pictures( Forward Predicted) decoded from previous I or P ‐ B Pictures (bidirectional) decoded from I or P ( ) ‐ frames are send out of order for B pictures to work

• Motion vectors
• Error vectors
• Error vectors
• RLE, Quantization, Huffman, etc…

Scalable Video Coding Scalable Video Coding

• H.264/MPEG‐4 codec

T l S l bili

• Temporal Scalability

‐ The motion compensation

• Spatial Scalability

‐ Coding video in several resolutions and high quality could be predicted

• SNR/Quality/Fidelity Scalability

‐ Video are coded in several qualities.

• Combined Scalability

‐ Combination of the three

Enhancements Enhancements

• Allocating more bits to region of interest (ROI)

Allocating more bits to region of interest (ROI)

• Assigning more bits to the region of scene‐

cuts cuts

• Increasing the speed of the motion detection

i d d i l i in unattended visual regions

• Parallelization of encoding/decoding and

coding of I,P and B frames

Problem Problem

• Coding needs more enhancements to be

Coding needs more enhancements to be faster

• Current codecs does not focus on the
• Current codecs does not focus on the

phsycovisual effects.

Refrences Refrences

• "Spatio‐temporal scalable video coding using subband and adaptive field/frame

interpolation" Yoshida, T.; Sawada, K.;Circuits and Systems, 1996., IEEE Asia Pacific Conference on 18‐21 Nov. 1996 Page(s):145 ‐ 148 g ( )

• "Spatio‐temporal scalability‐based motion‐compensated 3‐D subband/DCT video coding"

Atta, R.; Ghanbari, M.;Circuits and Systems for Video Technology, IEEE Transactions on Volume 16, Issue 1, Jan. 2006 Page(s):43 – 55

• "The motion attention directed fast mode decision for spatial and CGS scalable video coding"
• The motion attention directed fast mode decision for spatial and CGS scalable video coding

Wu, Y.‐D.; Chih‐Wei Tang; Broadband Multimedia Systems and Broadcasting, 2008 IEEE International Symposium on March 31 2008‐April 2 2008 Page(s):1 ‐ 4

• "Storyboard construction using segmentation of MPEG encoded news video" JinWoun Choi;

D S k J Ci i d S 2000 P di f h 43 d IEEE Mid DongSeok Jeong; Circuits and Systems, 2000. Proceedings of the 43rd IEEE Midwest Symposium on Volume 2, 8‐11 Aug. 2000 Page(s):758 ‐ 761 vol.2 Digital Object Identifier 10.1109/MWSCAS.2000.952867

• "Adaptive rate control for streaming stored fine‐grained scalable video" Philippe de Cuetos,

Keith W. Ross. May 2002. NOSSDAV '02: Proceedings of the 12th international workshop on Network and operating systems support for digital audio and video

• "Parallelizing MPEG video encoding using multiprocessors" Barbosa, D.M.; Kitajima, J.P.;

Weira, W., Jr. Computer Graphics and Image Processing, 1999. Proceedings. XII Brazilian p p g g g Symposium on Volume , Issue , 1999 Page(s):215 ‐ 222

• http://www‐video.eecs.berkeley.edu/erl/sccheung.html
• http://vsr.informatik.tu‐chemnitz.de/~jan/MPEG/HTML/mpeg_tech.html