The purpose of this change is to avoid the cost of supporting many
versions of OpenCV.

Repurposes existing u8 implementations of remap_s16 for Neon and SVE2,
and makes them work for source type u16.

Michael Platings authored Dec 12, 2024 and Denes Tarjan committed Dec 18, 2024

Also update signature of remap and warp_perspective functions to avoid
the same mistake there.

The purpose of this change is to avoid the cost of supporting many
versions of OpenCV.

It was found that enabling multithreading for these functions did not
significantly improve performance compared to the single-threaded
equivalents.

Multithreading is only enabled in the OpenCV HAL. The multithreaded API
is likely to change and therefore is not supported for direct use.

Igor Podgainoi authored Jun 26, 2024 and Mark Horvath committed Jul 08, 2024

Sigma is the common notation for standard deviation. With this change
the standard deviation of the filter used for blurring can be set.