SPRUJ28E November 2021 – September 2024 AM68 , AM68A , TDA4AL-Q1 , TDA4VE-Q1 , TDA4VL-Q1
The LDC first performs an affine transform, which can be used for rotations and scaling, as shown in Figure 6-126. The output of the pixel coordinate is used as the input address to the affine transform.
The mapping from destination coordinate to the source coordinate is expressed as:
haff = a × hu + b × vu + c
vaff = d × hu + e × vu + f
This transform allows full rotation, expansion, contraction, and translation. The parameters {a, b, d, e} are in S16Q12 (signed number on 14 bits with 2 bits for integer and 12 bits of fraction) format, and parameters {c, f} are in S16Q3 format (signed number on 16 bits with 13 bits for integer and 3 bits of fraction). These parameters must be set in following bit fields: