Fundamentals of Data Compression - Why, How, and Performance Metrics

Topics today… ,[object Object],[object Object],[object Object],[object Object],[object Object]

Why Compression? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Why Compression? Table –1 : Uncompressed source data rates Source Bit Rates for uncompressed Sources (Approximate) Telephony (200-3400 Hz) 8000 samples/second x 12 bits/sample = 96 kbps Wideband Audio (20-20000 Hz) 44100 samples/second x 2 channels x 16 bits/sample= 1.412Mbps Images 512x512 pixel color image x 24 bits/pixel = 6.3Mbits/image Video 640x480 pixel color image x 24 bits/pixel x 30 images/second=221 Mbps  650 megabyte CD can store 23.5 mins of video ? HDTV 1280x720 pixel color image x 60 images/second x 24 bits/pixel=1.3Gbps

The compression problem ,[object Object],[object Object]

Synonyms for Data Compression ,[object Object],[object Object],[object Object],[object Object],[object Object]

Types of Data Compression Problem ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Information Theory Basics ,[object Object],[object Object],[object Object],[object Object],[object Object]

Information Theory Basics ,[object Object],[object Object],[object Object]

Discrete Memoryless Model ,[object Object],[object Object],[object Object],[object Object]

Discrete Memoryless Model [2] ,[object Object],[object Object],[object Object]

Noiseless source coding theorem ,[object Object]

Entropy Reduction ,[object Object],[object Object],[object Object],[object Object],[object Object]

Entropy Reduction [2] ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Entropy Reduction [3] ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Unique Decipherability ,[object Object],[object Object],[object Object]

Unique Decipherability [2] ,[object Object],[object Object],[object Object],[object Object]

Unique Decipherability [3] ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Classification of compression algorithms CODEC

Classification of compression algorithms [2] ,[object Object],[object Object],[object Object]

Classification of compression algorithms [3] ,[object Object],[object Object],[object Object]

Data compression model ,[object Object],[object Object],[object Object],[object Object]

Data compression model REDUCTION IN DATA REDUNDANCY ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Data compression model REDUCTION IN ENTROPY ,[object Object],[object Object],[object Object],[object Object],[object Object]

Compression Performance ,[object Object],[object Object],[object Object],[object Object],[object Object]

Compression Performance AMOUNT OF COMPRESSION ACHIEVED ,[object Object],[object Object],[object Object]

Compression Performance SUBJECTIVE QUALITY METRIC ,[object Object],[object Object],[object Object],[object Object]

Compression Performance OBJECTIVE QUALITY METRIC ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Compression Performance CODING DELAY AND COMPLEXITY ,[object Object],[object Object],[object Object]

Compression Performance CODING DELAY AND COMPLEXITY ,[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object]

Fundamentals of Data Compression - Why, How, and Performance Metrics

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