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What is JPEG? »

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Modified on 2010/05/07 10:02 by Administrator Paths: JPEG Categorized as Digital Image Processing

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

Image

DCT-based encoder simplified diagram

Image

DCT-based decoder simplified diagram

Baseline JPEG (DCT)

Discrete Cosine Transform

Image

Baseline JPEG (Quantization)

Image

Zigzag scan

Image

  • DC element (average intensity of spatial block): DPCM (Differential Pulse Code Modulation)
  • AC element: RLC (Run Length coding): (run, value) with EOB

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