Tài liệu A Concise Introduction to Data Compression- P3 pptx

... case of many grayscales) or three components (in the case of a color image). A continuous-tone image is normally a natural image (natural as opposed to artificial) and is obtained by taking a photograph ... searching for the farthest array element to the left of a 9 that has a count smaller than that of a 9 . This search can be a straight linear search if the array is short...

Ngày tải lên: 14/12/2013, 15:15

... called the Haar measure, which allows an analog of Lebesgue integrals to be defined on locally compact topological groups. Mathematical lore has it that John von Neumann tried to discourage Haar ... scientists, artists, or writers whose names are inextricably associated with Canada. Similarly, no Canadian plays, stories, or traditional legends are as well-known as the Shakespeare plays, Gr...

Ngày tải lên: 14/12/2013, 15:15

... is called digitally sampled analog data (DSAD). (See also Scalar Quantization.) Voronoi Diagrams. Imagine a petri dish ready for growing bacteria. Four bacteria of different types are simultaneously ... In practice, vector quantization is commonly used to compress data that has been digitized from an analog source, such as sampled sound and scanned images (drawings or photographs). Suc...

Ngày tải lên: 14/12/2013, 15:15

... pixels may appear many times, and in an audio file, a string of audio samples may also appear repeatedly. A dictionary-based method maintains a dictionary that contains bits and pieces of the data. As ... next example is even more convincing (and only somewhat contrived): alfeastmaneasilyyells A| AAAAAAAAAA AAAAAH . The encoder creates the token (1,9 ,A) , matching the first nine c...

Ngày tải lên: 14/12/2013, 15:15

... the telephone) was given to Alexander Graham Bell. Bain’s fax machine transmitter scanned a flat, electrically conductive metal surface with a stylus mounted on a pendulum that was powered by an electromagnet. ... encoder transmits the compressed data, as it is being generated, over a network. In such a case, a code with large variance causes the encoder to generate bits at a...

Ngày tải lên: 14/12/2013, 15:15

... came. —Tom Clancy, Clear and Present Danger Chapter Summary Images are an important type of digital multimedia data. Images are popular, they are easy to create (by a digital camera, scanning a document, ... the matrix approach to the Haar transform to introduce the reader to the idea of filter banks. We show how the Haar transform can be interpreted as a bank of two filters, a...

Ngày tải lên: 14/12/2013, 15:15

... (1: a) and (2: b). The encoder outputs 1 (a) , 2 (b), 3 (ab), 5 (aba), 4 (ba), 7 (bab), 6 (abab), 9 (ababa), 8 (baba), and adds the new entries (3: ab), (4: ba), (5: aba), (6: abab), (7: bab), ... initialized to the fourth a. Continuing this process is straightforward. The result is that strings aa, aaa, aaaa, are added to the dictionary as entries 256, 257, 258, , and the output is 97...

Ngày tải lên: 14/12/2013, 15:15

... goals, relational data marts and OLAP cubes differ greatly in data storage, data content, data sources, data retrieval, and business analysis capabilities. Data Storage Relational data marts ... Summarized Data Detailed and Summarized Data Summarized Data Summarized Data Data Sources Data Sources Relational and Non-relational Sources Relational and Non-relationa...

Ngày tải lên: 21/12/2013, 19:15

... the training data. The training data is a statistically representative subset of historical data where the attributes to be predicted are known. The training data must contain the case data element, ... build a data mining model with OLAP data. Lead-in These are a variety of steps involved in building a data mining model with OLAP data. iv Module 17: Introduc...

Ngày tải lên: 24/01/2014, 19:20