INHERITANCE IN SAMPLE ARRAY MULTITREE DIVISION

摘要

A better compromise between encoding complexity and achievable rate distortion ratio, and/or to achieve a better rate distortion ratio is achieved by using multitree sub-divisioning not only in order to subdivide a continuous area, namely the sample array, into leaf regions, but using the intermediate regions also to share coding parameters among the corresponding collocated leaf blocks. By this measure, coding procedures performed in tiles—leaf regions—locally, may be associated with coding parameters individually without having to, however, explicitly transmit the whole coding parameters for each leaf region separately. Rather, similarities may effectively exploited by using the multitree subdivision.

主权项

1. A decoder for reconstructing an array of information samples from a data stream which has been generated by subdividing an array of spatially sampled information samples into leaf regions of different sizes by multi-tree subdivision, wherein:
each leaf region has associated therewith a hierarchy level out of a sequence of hierarchy levels of the subdivision, each leaf region has associated therewith coding parameters, the coding parameters are, for each leaf region, represented by a respective set of syntax elements, and each syntax element is of a respective syntax element type out of a set of syntax element types, in which the decoder comprises an extractor for extracting, from the data stream, the subdivision information relating to the subdivision and inheritance information to be transmitted as signals within the data stream in addition to the sub-division information the inheritance information indicating as to whether, and for which inheritance region corresponding to one of the sequence of hierarchy levels of the tree, inheritance is used for sharing at least one coding parameter among leaf regions other than ones that constitute the inheritance region or not, the inheritance information also indicating the inheritance is used for which inheritance region corresponding to one of the sequence of hierarchy levels, if the inheritance information indicates the usage of the inheritance, the decoder extracts, for the inheritance region, at least one syntax element corresponding to the inheritance region from the data stream, and shares the at least one syntax element as the at least one coding parameter among the leaf regions other than ones that constitute the inheritance region or predicts the at least one coding parameter for a leaf region other than one that constitute the inheritance region uses the at least one syntax element.