Picture coding and decoding

摘要

A picture (1) with multiple slices (2-5) is encoded by determining a hierarchical granularity for the picture (1) defining a hierarchical level for slice border alignments. Address information allowing identification for a respective slice start is determined for at least a portion of the slices (2-5) based on the hierarchical granularity. The pixel values of the slices are encoded to generate coded slice representations (56). These coded slice representations (56) are included together with the address information into a coded picture representation (50) to which information of the hierarchical granularity is associated. The hierarchical granularity provides a flexible way of defining at which coding unit level slice borders can be present in the picture (1).

主权项

1. A method of coding a picture comprising multiple slices and being composed of multiple largest coding units having a selected size in terms of number of pixels, said method comprises:
determining a hierarchical granularity for said picture defining a hierarchical level for slice border alignment, said hierarchical level defining a size of a smallest possible addressable coding unit at which a start of a slice in said picture can be aligned, said multiple largest coding units can be hierarchically split into multiple coding units having respective sizes that are smaller than said selected size; generating, for at least a portion of said multiple slices and based on said hierarchical granularity, address information identifying a respective first coding unit of said at least a portion of said multiple slices within said picture, wherein generating said address information comprises generating, for each slice of said multiple slices except a first slice in said picture and based on said hierarchical granularity, said address information identifying a respective first coding unit of said each slice of said multiple slices except said first slice; generating a respective coded slice representation of each slice of said multiple slices; including said respective coded slice representation and said address information in a coded picture representation of said picture; and associating said information of said hierarchical granularity to said coded picture representation.