SPRUJ28E November 2021 – September 2024 AM68 , AM68A , TDA4AL-Q1 , TDA4VE-Q1 , TDA4VL-Q1
As the coordinates calculated by the back mapping function are not integer values in most cases, b-cubic interpolation is applied to the back mapped pixels. Interpolation is done on the pixel of same color (either Red or Blue).
Output pixel is interpolated from the 16 pixels in the 4x4 grid around the back mapped location, as shown in Figure 6-82. Ri and Bi indicate integer co-ordinates of back mapped pixels. Bi-cubic interpolation is used first along the horizontal direction, then the vertical direction.