Computer Science · A1.1 Computer Hardware and Operation

A1.1.8 — The Concept of Compression

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IB DP Computer Science — A1 Computer fundamentals — Computer hardware and operation | SL | A1.1.8

📋 What You Will Learn

  • Define compression and calculate a compression ratio
  • Distinguish lossless compression from lossy compression and match each to its uses
  • Describe and apply run-length encoding (RLE), including when it fails
  • Construct and trace an RLE encoder in pseudocode, Java and Python
  • Describe transform coding and why discarding frequency detail makes it lossy

🧳 Why This Matters Packing for a trip you can either roll your clothes tightly (everything survives intact — lossless) or leave two jumpers behind (lighter still, but something is gone forever — lossy). Every photo you send and every video you stream has been through exactly this decision.

📖 Definition — Compression Compression is the process of re-encoding data so that

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More notes on A1.1 Computer Hardware and Operation

  1. 01A1.1.9 — Cloud Computing Services: SaaS, PaaS and IaaS
  2. 02A1.1.3 — CPU vs GPU: Architecture, Performance and Cooperation
  3. 03A1.1.1 — CPU Components: Functions and Interactions
  4. 04A1.1.5 — The Fetch, Decode and Execute Cycle
  5. 05A1.1.4 — Primary Memory: RAM, ROM, Cache and Registers
  6. 06A1.1.6 — Pipelining in Multi-Core Architectures
  7. 07A1.1.7 — Secondary Memory Storage: Internal and External
  8. 08A1.1.2 — The Role of the GPU