Reference Picture List Allocation in Slice Headers for Video Coding

The patent applies preliminary action by pre-defining the maximum number of reference picture list structures (e.g., 16 structures) in the decoder configuration. This allows the decoder to allocate memory for a fixed number of structures in advance, avoiding the need for dynamic memory allocation during picture decoding. The actual number of active structures is determined by the `num_ref_pic_lists` parameter, but the memory capacity is predetermined, simplifying the allocation process while maintaining flexibility in handling different reference picture list configurations.

The patent applies the intermediary principle by introducing collocated pictures as a mediator for motion vector prediction. Instead of directly predicting motion vectors from current picture data, the system uses collocated pictures (reference pictures at the same spatial location but different temporal positions) as an intermediate step. The motion vector is first estimated using the collocated picture and then applied to generate the current picture, simplifying the prediction process while maintaining accuracy through the temporal correlation between frames.