Image & Video Compression Lecture # 3 Shahab Baqai LUMS - - PowerPoint PPT Presentation

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Image & Video Compression Lecture # 3 Shahab Baqai LUMS - - PowerPoint PPT Presentation

Sep 03, 2022 24 likes •300 views

CS 584 / CMPE 584 Multimedia Communication Image & Video Compression Lecture # 3 Shahab Baqai LUMS Outline Motivation for compression Brief review of generic compression system Use of transforms for representing a signal

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CS 584 / CMPE 584 Multimedia Communication

Image & Video Compression

Lecture # 3

Shahab Baqai LUMS

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Outline Motivation for compression Brief review of generic compression system

– Use of transforms for representing a signal

Image compression

– Transform, uniform quantization, Huffman coding

Video compression

– Exploit temporal dimension of video signal – Motion-compensated prediction – Generic (MPEG-type) video coder architecture

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Motivation for Compression: Example of HDTV Video Signal

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Achieving Compression

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Spatial and Temporal Redundancy

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Generic Compression System

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Generic Compression System (cont.)

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Generic Compression System (cont.)

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Representations: Transform and Subband Filtering Methods

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Transform Image Coding

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Possible Transforms for Image Coding

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Global DCT versus Block DCT

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Discrete Cosine Transform (DCT)

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2-D Discrete Cosine Transform

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Coding Transform Coefficients

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Comments on Transform & Subband Filtering Methods

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Transform/Subband Representations: Wavelet Transform

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Image Compression

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Spatial Processing Transform/Subband Methods

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Spatial Processing Block DCT

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Color Space Processing

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Color Space Processing

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Image Coding – Partial Summary

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Quantization of DCT Coefficients

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Runlength Coding and Zigzag Scanning of DCT Coefficients

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Example: Runlength Coding and Zigzag Scanning of DCT Coefficients

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Image Compression: Summary