CHEN Guowang FANG Wei HUANG Baihan

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Presentation transcript:

CHEN Guowang FANG Wei HUANG Baihan JPEG Coding CHEN Guowang FANG Wei HUANG Baihan

Adding Redundancy to Ensure Correctness 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 Compressing each 8x8 block 2-D DCT Quantization Lossless Coding Compressed Image

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

Original Down-sample all components Preserve Y component

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

2-D Basis Images

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

Quantization Coefficient Matrix ÷ Quantization Matrix = Result = ÷

Zigzag Scan & Run-length Coding Numbers of Zeros Before Value 1 -2 -1 2 End of Block

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