### Abstract

Picture coding standards have been developed and are now in position to be practically the most effective methods. However, some redundancy is found as a certain correlation for longer interval on coded bitstreams of pictures^{[1-5]}. Entropy derived from the probability of occurrence of fixed length bit patterns in coded bitstream is investigated. A small redundancy is found for the interval with a length up to 20 bits in the tested bitstreams. Entropy for the interval with length of 30 bits on coded bitstream is difficult to be calculated because the data size exceeds available memory capacity. To reduce data size, the authors calculate entropy for sampled patterns based on an assumption that the optimum coded bitstream is a random sequence. Based on this assumption, we obtained an necessary length of coded bitstream for accuracy analysis. The analysis shows that the entropy decreases for some bitstreams, which indicates that re-encoding algorithm for bitstreams of coded picture is worth being developed.

Original language | English |
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Title of host publication | 22nd Picture Coding Symposium |

Pages | 397-400 |

Number of pages | 4 |

Publication status | Published - 2001 |

Event | Proceedings of the 22nd Picture Coding Symposium: PCS-2001 - Seoul Duration: 2001 Apr 25 → 2001 Apr 27 |

### Other

Other | Proceedings of the 22nd Picture Coding Symposium: PCS-2001 |
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City | Seoul |

Period | 01/4/25 → 01/4/27 |

### Fingerprint

### ASJC Scopus subject areas

- Engineering(all)

### Cite this

*22nd Picture Coding Symposium*(pp. 397-400)

**Analysis of coded bitstream of picture - Effects of calculating accuracy.** / Ohzeki, Kazuo; Shimamura, Sadaharu.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

*22nd Picture Coding Symposium.*pp. 397-400, Proceedings of the 22nd Picture Coding Symposium: PCS-2001, Seoul, 01/4/25.

}

TY - GEN

T1 - Analysis of coded bitstream of picture - Effects of calculating accuracy

AU - Ohzeki, Kazuo

AU - Shimamura, Sadaharu

PY - 2001

Y1 - 2001

N2 - Picture coding standards have been developed and are now in position to be practically the most effective methods. However, some redundancy is found as a certain correlation for longer interval on coded bitstreams of pictures[1-5]. Entropy derived from the probability of occurrence of fixed length bit patterns in coded bitstream is investigated. A small redundancy is found for the interval with a length up to 20 bits in the tested bitstreams. Entropy for the interval with length of 30 bits on coded bitstream is difficult to be calculated because the data size exceeds available memory capacity. To reduce data size, the authors calculate entropy for sampled patterns based on an assumption that the optimum coded bitstream is a random sequence. Based on this assumption, we obtained an necessary length of coded bitstream for accuracy analysis. The analysis shows that the entropy decreases for some bitstreams, which indicates that re-encoding algorithm for bitstreams of coded picture is worth being developed.

AB - Picture coding standards have been developed and are now in position to be practically the most effective methods. However, some redundancy is found as a certain correlation for longer interval on coded bitstreams of pictures[1-5]. Entropy derived from the probability of occurrence of fixed length bit patterns in coded bitstream is investigated. A small redundancy is found for the interval with a length up to 20 bits in the tested bitstreams. Entropy for the interval with length of 30 bits on coded bitstream is difficult to be calculated because the data size exceeds available memory capacity. To reduce data size, the authors calculate entropy for sampled patterns based on an assumption that the optimum coded bitstream is a random sequence. Based on this assumption, we obtained an necessary length of coded bitstream for accuracy analysis. The analysis shows that the entropy decreases for some bitstreams, which indicates that re-encoding algorithm for bitstreams of coded picture is worth being developed.

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M3 - Conference contribution

SP - 397

EP - 400

BT - 22nd Picture Coding Symposium

ER -