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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 |
There are two types of compression i.e lossy_compression and lossless_compression
Lossless_compression: the data is compressed without any loss of data.
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 2) for(; ;) {if (counter= = (dim.x)* (dim.y)) break ; 3) get_next_sample ( ); 4) compute D1, D2, D3; 5) if (D1 == 0 && D2 ==0 && D3 == 0) { 6) run_mode_processing ( ) { 7) run_length_scanning ( ); 8) Run_length_coding( ); 9) run_interruption_coding( ); 10) update A[ q ], N[ q ], Nn[ Q ] ; } 11) else{regular_mode_proccessing(); { 12) context_classification( ); 13) prediction_error_computation( ); 14) limited_golomb_rice_coding( ); 15) update 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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