- Added functionality to preserve target's ears when using Poisson blending.
- Introduced new global variables in `globals.py`:
- `preserve_target_ears` (boolean flag)
- `ear_width_ratio`
- `ear_height_ratio`
- `ear_vertical_offset_ratio`
- `ear_horizontal_overlap_ratio`
- Added command-line argument `--preserve-ears` to `core.py`.
- Modified `face_swapper.py` to adjust the Poisson blending mask by
subtracting calculated ear regions if `preserve_target_ears` is true.
This aims to reduce artifacts around ears by using the original target
frame's ear content.
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