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Compression Algorithm Assignment Help


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What is Compression Algorithm?


Data compression algorithm:

Data compression algorithm

Data compression methods are two types: 


1) First is called lossless method (text or programs) : it is categorized into three parts i.e. Run-length, Huffman and Lempel Ziv.

2) Second is called lossy methods (images, video, audio) : it is categorized into three parts i.e. JPEG, MPEG, MP3.


COMPRESSION   ALGORITHMS
Input   datatype
Today’s   leading compression algorithm
Previous   leading compression algorithm
Compression   ration improvement versus complexity increase
Text
Burrows   wheeler
Lempel   Ziv Welch
1.1/5   = 0.22
Speech
AMR   at 8 kbits/s
GSM-FR   at 13 kbits/s
1.6/2   = 0.8
Audio
AAC
MP3
1.5/2   = 0.75
Photo
JPEG2000
JPEG
1.5/2   = 0.75
Video
H.265
H.264
2/3   -= 0.667


Types of image compression:


There are two types of compression i.e lossy_compression and lossless_compression

Lossless_compression: the data is compressed without any loss of data.

  1. Lossless_compression algorithm is:
  2. Shannon Fano algorithm
  3. Huffman coding
  4. Run length coding
  5. LZW compression
  6. Arithmetic coding

Lossy_compression: it is assumed that some loss of information is acceptable. Is suitable for natural image.


Lossy compression: it is assumed that some loss of information is acceptable. Is suitable for natural image.


1) initialize A[ q ], N[ q ], B[ q ], C[ q ], Nn[ q ], pixel position
2for(; ;) {if (counter=  = (dim.x)* (dim.y)) break ;
3) get_next_sample ( );
4compute D1, D2, D3;
5if (D1 == 0 && D2 ==0  && D3 == 0) {
6) run_mode_processing ( ) {
7) run_length_scanning ( );
8) Run_length_coding( );
9) run_interruption_coding( );
10update A[ q ], N[ q ], Nn[ Q ] ; }
11else{regular_mode_proccessing(); {
12) context_classification( );
13) prediction_error_computation( );
14) limited_golomb_rice_coding( );
15update A[ q ], N[ q ], B[ q ], C[ q ] ; } } }


Example:  Find the sequence of LZ77 decoding. Given sequence are B, D, D, B, C, S, B, D, B, E . LZ77 decoding of the triple { ‘7’, ‘4’, C(s) } :


Answer: 

A
C
C
A
B
R
A
C
A
D
Initial State


A
C
C
A
B
R
A
C
A
D



Move back 7






 

A
C
C
A
B
R
A
C
A
D
A



<= copy 1 =>


A
C
C
A
B
R
A
C
A
D
A
B




<= copy 2 =>


A
C
C
A
B
R
A
C
A
D
A
B
R





<= copy 3 =>


A
C
C
A
B
R
A
C
A
D
A
B
R
A






<= copy 3 =>


A
C
C
A
B
R
A
C
A
D
A
B
R
A
R














C(r)


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