SPRUJ28E November 2021 – September 2024 AM68 , AM68A , TDA4AL-Q1 , TDA4VE-Q1 , TDA4VL-Q1
The hardware supports adaptive Bilateral filtering using num_sub_tables > 0. The num_sub_table = 1 means 2 tables withing LUT per distance, num_sub_table = 2 means 4 sub_table within LUT per distance and num_sub_table = 3 means 8 sub_tables per distance. The tables are stored as interlaved within each distance. For example in case num_sum_table = 1, there are two LUT within each distance with even entries coming from LUT1 and odd entries coming from table 2 as shown in Figure 6-173.
The adaptation logic consist using 4×4 average of 5×5 window (top left corner) and num_sub_tables from MMR as shown below using combo logic below: