Video Compression (cont.) Lecture # 6 Shahab Baqai LUMS Outline - - PowerPoint PPT Presentation

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Video Compression (cont.) Lecture # 6 Shahab Baqai LUMS Outline - - PowerPoint PPT Presentation

Nov 14, 2022 134 likes •615 views

CS 584 / CMPE 584 Multimedia Communication Video Compression (cont.) Lecture # 6 Shahab Baqai LUMS Outline Scalable video coding Overview of current video compression standards What do the standards specify? Frame-based video

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CS 584 / CMPE 584 Multimedia Communication

Video Compression (cont.)

Lecture # 6

Shahab Baqai LUMS

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Outline Scalable video coding Overview of current video compression standards

– What do the standards specify? – Frame-based video coding: MPEG-1/2/4, H.261/3/L – Object-based video coding: MPEG-4

Examine MPEG-4 as case-study of object-based video coding

– Scope, desired functionalities – Video representation and coding – Individual arbitrarily shaped objects – Scene description for composing individual objects to form scene

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Scalable video coding

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Scalable Video Coding

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Example of Scalable Coding

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Scalable Video Coding (cont.)

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Scalable Coding: Temporal Scalability

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Scalable Coding: Spatial Scalability

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Scalable Coding: SNR (Quality) Scalability

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Summary of Scalable Video Coding

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Standards

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What do the Standards Specify?

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What do the Standards Specify?

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Current Image and Video Compression Standards

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Comparing Current Video Compression Standards

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MPEG-1 and MPEG-2

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Example Use of I-,P-,B-frames: MPEG Group of Pictures (GOP)

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MPEG Group of Pictures (GOP) Structure

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MPEG Structure

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MPEG-2 Profiles and Levels

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Goals of MPEG-4

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Comparing MPEG-1/2 and H.261/3 with MPEG-4

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MPEG-4 A Case-study

  • f

Object-based Video Coding

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Comments on Object-based Processing

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Comments on Object-based Processing

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Different Parts of MPEG-4

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Scene Description

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Scene Description

  • Example of MPEG-4 Scene

[MPEG Committee]

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Scene Description

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Example MPEG-4 Decoding Process

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Object-based Processing in the Compressed Domain

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MPEG-4 Natural Video

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MPEG-4 Coding of Natural Video

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MPEG-4 Natural Video Coding

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Coding of Arbitrarily Shaped Video Objects

  • Different aspects of coding arbitrarily shaped video objects:

– Coding of texture (amplitude) information – MC-prediction – I, P, B coding of objects – Coding of shape information

  • Goal: brief, conceptual overview
  • Key points to take away:
  • 1. Different attributes to code for arbitrarily shaped

video objects → Texture, motion, & shape information

  • 2. MPEG-4 extends block-based coding to code arbitrarily shaped objects

(Not an elegant solution, but it works)

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Example of Arbitrarily Shaped Object

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Comments on Segmentation

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Coding the Texture of an Arbitrarily Shaped Object

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MC-Prediction for Texture Coding of Arbitrarily Shaped Object

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MC-Prediction for Video Object Planes: I, P, and B VOP’s

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Binary Shape Coding

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Binary Shape Coding: Block-based Shape Coding

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Binary Shape Coding: Block-based CAE (cont.)

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Sprite Coding (Background Prediction)

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Sprite Coding Example

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Related MPEG Standards (non-compression)

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MPEG Links http://www.mpeg.org http://www.chiariglione.org/mpeg/ http://www.m4if.com/