Kompresja danych accept the convention that the word
- Slides: 12
Kompresja danych. . . accept the convention that the word "compression" be encoded as "comp". . ZIP file format. . . both the sender and receiver of the information understand the encoding scheme. . . Lossless vs. lossy compression
Kompresja danych stratna
Claude E. Shannon, 1948 A Mathematical Theory of Communication 0. xfoml rxkhrjffjuj zlpwcfwkcyj ffjeyvkcqsghyd qpaamkbzaacibzlhjqd 1. ocroh hli rgwr nmielwis eu ll nbnesebya th eei alhenhttpa oobttva nah 2. on ie antsoutinys are t inctore st be s deamy achin d ilonasive tucoowe 3. in no ist lat whey cratict froure birs grocid pondenome of demonstures 4. .
Kompresja danych bezstratna 1.
MP 3 digital audio encoding and lossy compression format, 1991, ISO. . . psychoacoustic models. . . tradeoffs between data size and sound quality. . . bit rate 128 - 320 kbit /s. . . compression artifacts. . . sound of applause: it is hard to compress because of its randomness and sharp attacks CD parameters: 44. 1 k. Hz, 2 channels, 16 bits per channel -> 1411. 2 kbit/s
JPG Joint Photographic Experts Group 1994, ISO 10918 -1 method of compression for photographic images lossy compression. . . from RGB into a different color space called YCb. Cr. . . discrete cosine transform MPEG Moving Picture Experts Group
kompresja 0 plik 16, 2 KB kompresja 20 plik 9, 94 KB kompresja 50 plik 9, 29 KB kompresja 100 plik 8, 37 KB JPG
Szum
JPG kompresja 100 bmp: 24 bit - 29, 3 KB 256 kolor – 10, 8 KB JPG kompresja 20 16 kolor – 5, 19 KB
GIF Graphics Interchange Format . . . limited to a palette of 256 colours or less. . . Unisys. . . owned some patents to key parts of the GIF compression technology, and has started demanding fees from every company whose software uses the (freely available) GIF code bmp 24 bit - 29, 3 KB gif – 14, 0 KB bmp 256 kolor – 10, 8 KB
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