Source Coding Techniques

Source coding is based on the content of the original signal is also called semantic-based coding

High compression rates may be high but a price of loss of information. Good compression rates make be achieved with source encoding with lossless or little loss of information.

There are three broad methods that exist:

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• Transform Coding
  • A simple transform coding example
• Frequency Domain Methods
  • 1D Example
  • 2D (Image) Example
  • What do frequencies mean in an image?
  • How can transforms into the Frequecny Domain Help?
• Fourier Theory
  • 1D Case
  • 2D Case
  • The Discrete Fourier Transform (DFT)
  • Compression
  • Relationship between DCT and FFT
• The Discrete Cosine Transform (DCT)
• Differential Encoding
• Vector Quantisation