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JPEG Joint Photographic Experts Group

JPEG Joint Photographic Experts Group. pôvodný obraz. ZR EC RLE. *.JPG. Zig Zag. 2Dtr. Q. S. 7 . . . 1 1 . . . 7. koeficienty v smere u. u. prah.

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JPEG Joint Photographic Experts Group

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  1. JPEGJoint Photographic Experts Group

  2. pôvodný obraz ZR EC RLE *.JPG Zig Zag 2Dtr Q S

  3. 7 . . . 1 1 . . . 7 koeficienty v smere u u prah Pôvodný obraz sa rozdelí na subobrazy „S“ s rozmerom 8x8 bodov. Tieto sa transformujú na maticu koeficientov „IXI“

  4. – 1. kompresia – koeficienty s podprahovou hodnotou sa ďalej nespracovávajú – ostatné sa zig–zag pozbierajú do vektora „x“ – vektor „x“ sa kvantuje  „xq“ 2. kompresia – vektor „xq“ má konečný počet hodnôt  zníženie redundancie

  5. – 3. kompresia – podľa početnosti výskytu jednotlivých úrovní sa priradí jednoduchý alebo zložitý kód  entropický kód – 4. kompresia – Run Lenght Encoding 1111100000001111110000 5 7 6 4 V skutočnosti sa spracováva väčší blok dát a výsledok sa oreže, aby nevznikal blocking efekt.

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