Data Compression


Criteria

Survey Formats

Basics

Compression Methods

Data Formats

Files

Audio Data

Image Data

Video Data

MPEG

Principle of MPEG

Picture Types

Sequence of Pictures

Decoding

Processing and Archiving


Glossary

Index


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Sequence of Pictures


Both predictive and bidirectionally coded pictures are not bound at their direct predecessors and/or successors. It is possible to derive the contents from pictures with a larger distance.


Example for a sequence of picture: IBBPBBPBB IBB...




In the above example the two B-pictures 2 and 3 are derived from the I-picture 1 and the P-picture 4. The different positions of the picture segments shall demonstrate the movement compensation. B-pictures cannot serve as reference and will not be stored.


P-pictures could relate to I-pictures and other P-pictures. In this example the picture 7 refers to the P-picture 4. All P-pictures must be stored within a buffer until the next I-picture is identified.


The buffer for this exemplary sequence must be designed for a maximum capacity by 4 pictures. The pictures stored there are I1, P3, P7 and the currently processed picture.


As soon as the I-picture 10 is decoded, the preceding pictures can be rejected from the buffer (I1, P3 and P7).


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MPEG - Survey DC Coded Pictures Decoding