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JPEG Coding

JPEG Coding. CHEN Guowang FANG Wei HUANG Baihan. General Coding. Source Data. Source Coding. Channel Coding. Transmission. Reducing Redundancy. Adding Redundancy to Ensure Correctness. JPEG Compression. Source Image. Color Space Transformation. Down Sample. Break into 8x8 Blocks.

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JPEG Coding

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  1. JPEG Coding CHEN Guowang FANG Wei HUANG Baihan

  2. General Coding Source Data Source Coding Channel Coding Transmission Reducing Redundancy Adding Redundancy to Ensure Correctness

  3. JPEG Compression Source Image Color Space Transformation Down Sample Break into 8x8 Blocks Compressing each 8x8 block 2-D DCT Quantization Lossless Coding Compressed Image

  4. Color Space Transformation • Y: brightness • Cb & Cr: blue-difference and red-difference

  5. Original Down-sample all components Preserve Y component

  6. JPEG Compression Source Image Color Space Transformation: RGB to YCbCr Down Sample Cb, Cr Components Break into 8x8 Blocks Compressing each 8x8 block 2-D DCT Quantization Lossless Coding Compressed Image

  7. 2-D Basis Images

  8. 2-D DCT Input image block After 2-D DCT

  9. Quantization Coefficient Matrix ÷ Quantization Matrix = Result = ÷

  10. Zigzag Scan & Run-length Coding

  11. Q & A

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