By David Salomon
"A really good treasure chest of data; spanning quite a lot of facts compression equipment, from basic try out compression the way to using wavelets in photograph compression. it really is strange for a textual content on compression to hide the sphere so thoroughly. - ACM Computing Reviews"Salomon's booklet is the main entire and up to date reference at the topic. the fashion, rigorous but effortless to learn, makes this e-book the popular selection â?│ [and] the encyclopedic nature of the textual content makes it an compulsory acquisition via our library. - Dr Martin Cohn, Brandeis UniversityData compression is without doubt one of the most vital instruments in glossy computing, and there was large development in all parts of the sector. This fourth variation of knowledge Compression offers an all-inclusive, completely up to date, and trouble-free reference for the numerous differing types and strategies of compression (especially audio compression, a space within which many new issues coated during this revised version appear).Among the real gains of the ebook are a close and worthy taxonomy, an in depth description of the commonest equipment, and discussions at the use and comparative merits of alternative tools. The book's logical, transparent and energetic presentation is prepared round the major branches of knowledge compression.
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Additional info for Data Compression: The Complete Reference
R •. • •. • F • •. •. • • .. • G •• •. •. • • •. • H •. •. •. U •. • •. V • .. • •. •. • •. • • K •. •. X •. •. •• L • .. •. • Y •. • • •• M •. •. •. Z •. 1: The 26 Braille Letters. and • •. • •• for •• •• •• of •. • •. • •• •• ch •. • gh • .. •. • sh •. •. • th •. • . 2: Some Words and Strings in Braille. Redundancy in Everyday Situations Even though we don’t unnecessarily increase redundancy in our data, we use redundant data all the time, mostly without noticing it. Here are some examples: All natural languages are redundant.
The compressor or encoder is the program that compresses the raw data in the input stream and creates an output stream with compressed (low-redundancy) data. The decompressor or decoder converts in the opposite direction. Note that the term encoding is very general and has several meanings, but since we discuss only data compression, we use the name encoder to mean data compressor. The term codec is sometimes used to describe both the encoder and the decoder. ” “Stream” is a more general term because the compressed data may be transmitted directly to the decoder, instead of being written to a ﬁle and saved.
Disadvantage of image RLE: When the image is modiﬁed, the run lengths normally have to be completely redone. , an uncompressed image, a raw dump of the bitmap) for complex pictures. Imagine a picture with many vertical lines. When it is scanned horizontally, it produces very short runs, resulting in very bad compression, or even in expansion. 8a,b) and it may automatically try all three ways on every bitmap compressed to achieve the best compression. 9b, use RLE to compress it, ﬁrst row by row, then column by column.