What is JPEG?
- The JPEG (Joint Photographic Experts Group) committee, formed in 1986, has been chartered with the
“ Digital compression and coding g p g of continuoustone still images”- Joint between ISO and ITU-T
- Has developed standards for the compression of lossy, lossless, and nearly lossless of still images in the past decade
Baseline JPEG
DCT-based encoder simplified diagram
DCT-based decoder simplified diagram
Baseline JPEG (DCT)
Discrete Cosine Transform
Baseline JPEG (Quantization)
Zigzag scan
- DC element (average intensity of spatial block): DPCM (Differential Pulse Code Modulation)
- AC element: RLC (Run Length coding): (run, value) with EOB