Data Compression Slide

... single color Our second way of classifying data compression methods is shown in Table 271b Most data compression programs operate by taking a group of data from the original file, compressing it ... TABLE 27-1 Compression classifications Data compression methods can be divided in two ways In (a), the techniques are classified as lossless or lossy Lossless methods restore the c...

Ngày tải lên: 13/09/2012, 09:50

... frequencies Part A: Implementing a Huffman decoder (In lab) Instructions (a) Please copy the sample code (decode.c) from the locker (’/mit/6.087 /Lab2 /decode.c’) (b) Please go through the code to understand ... are known Instructions (a) Please copy the sample code (encode.c) from the locker (’/mit/6.087 /Lab2 /encode.c’) (b) Please go through the code to understand the overall structure and...

Ngày tải lên: 25/04/2013, 08:07

... organizations A close relative of data encryption is the field of data hiding (steganography) A data file A (a payload) that consists of bits may be hidden in a larger data file B (a cover) by taking ... 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...

Ngày tải lên: 14/12/2013, 15:15

... 1|010 a2 a2 1|011 a2 1|100 a5 1|101 a4 1|110 a3 a1 1|111 a3 0 T2 11|000 11|001 11|010 11|011 11|100 11|101 11|110 11|111 = 11 a5 a1 a5 a4 a1 a4 a3 a1 a1 a3 a1 a3 a2 a3 1 T3 = 110 110|000 a5 a1 a1 ... a1 45 0.6 a2 345 a2 0.2 a4 0.1 a2 0.2 a3 0.2 a3 45 a2 3 1.0 0.4 0.4 a4 0.1 a4 5 a5 0.1 0.6 a3 0.2 1 a4 5 0.2 a5 0.1 (a) 0.2 (b) Figure 2.1: Huffman Codes sma...

Ngày tải lên: 14/12/2013, 15:15

... a| bbaabbaabaabaaaa 0 0 0 The next three steps hash the strings bba, baa, and aab to, say, 1, 5, and The encoder outputs the three raw symbols b, b, and a, moves the separator, and updates the hash ... 10) They are bba, baa, aab, aba, and baa They hash to 1, 5, 0, 3, and (we arbitrarily assume that aba hashes to 3) Cell of the hash table is set to 9, and cells 0, 1, and become the st...

Ngày tải lên: 14/12/2013, 15:15

... scale of analysis is said to become smaller and smaller A large-scale analysis illustrates the global behavior of the signal, while each small-scale analysis illuminates the way the signal behaves ... that in a continuous-tone image, adjacent data units of pixels are normally correlated in the sense that the average values of the pixels in adjacent data units are close We already kn...

Ngày tải lên: 14/12/2013, 15:15

... —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, ... (5.11) Instead of calculating averages and differences, all we have to is construct matrices A1 , A2 , and A3 , multiply them to get W = A1 A2 A3 , and apply W to all the colu...

Ngày tải lên: 14/12/2013, 15:15

... (a) , (b), (ab), (aba), (ba), (bab), (abab), (ababa), (baba), and adds the new entries (3: ab), (4: ba), (5: aba), (6: abab), (7: bab), (8: baba), (9: ababa), (10: ababab), (11: babab), to ... source, such as sampled sound and scanned images (drawings or photographs) Such data is called digitally sampled analog data (DSAD) (See also Scalar Quantization.) Voronoi Diagrams Imagine a pet...

Ngày tải lên: 14/12/2013, 15:15

... string aaa to the dictionary as entry 257 and outputs 256 (aa) I is initialized to the fourth a Continuing this process is straightforward The result is that strings aa, aaa, aaaa, are added to ... (baba), and adds the new entries (3: ab), (4: ba), (5: aba), (6: abab), (7: bab), (8: baba), (9: ababa), (10: ababab), (11: babab), to the dictionary This regular behavior can be analyzed...

Ngày tải lên: 14/12/2013, 15:15

... Chapter - Data Compression Chapter - Lossless Data Compression Chapter 10 - Lossy Compression Chapter- Audio Signal Processing Audio signal processing, sometimes referred to as audio processing, ... Chapter - Audio Signal Processing Chapter - Digital Image Processing Chapter - Computer Vision Chapter - Noise Reduction Chapter - Edg...

Ngày tải lên: 05/06/2014, 11:40

... distribution of subband error The two mechanisms facilitate the significant normalization of subband data and a quantization scheme design with linear distortion characteristics EURASIP Journal on Advances ... we cannot evaluate 64-sample case or larger In this paper, towards the realization of RRO-NRDPWTbased ECG data compression system, a modified run-length c...

Ngày tải lên: 21/06/2014, 05:20

... realistic networks using real WAP traffic Also, since WAP 2.0 has been newly released, there has not been any comparison of the performance of WAP 2.0 stack against WAP 1.x stack in the literature ... In WAP 1.x, a content encoding approach is used at the WAP gateway to compress the data Although WAP 2.0 is an evolutional step forward, by adopting the...

Ngày tải lên: 23/06/2014, 00:20

... Decoding Where’s the Beef? The Code The Compression Program The Expansion Program Initializing the Model Reading the Model Initializing the Encoder The Encoding Process Flushing the Encoder The Decoding ... to the branch These two bits will be the LSBs of the resulting codes On the next pass through the list of free nodes, the B and C nodes are picked as the...

Ngày tải lên: 02/08/2014, 08:20

... 12.1 Introduction • Dynamic data structures – Data structures that grow and shrink during execution • Linked lists – Allow insertions and ... searching and sorting of data and efficient elimination of duplicate data items © 2000 Prentice Hall, Inc All rights reserved 12.2 Self-Referential Structures • Self-referential structures – Structure ... to form useful data structur...

Ngày tải lên: 24/10/2014, 01:17

... Flash video (FLV) 15-1 LOSSLESS COMPRESSION In lossless data compression, the integrity of the data is preserved The original data and the data after compression and decompression are exactly the ... methods, the compression and decompression algorithms are exact inverses of each other: no part of the data is lost in the process Redundant data is removed in compression an...

Ngày tải lên: 22/10/2015, 17:31