Intel® Integrated Performance Primitives Developer Guide and Reference

ID 790148
Date 11/07/2023
Public

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Rounding Mode

As many Intel IPP functions have to meet the bit-exact requirement, image processing functions use rounding. The default rounding mode for all functions can be described as "nearest even", that is the fixed point number x=N + α, 0 ≤ α < 0, where N is an integer number, is rounded as given by:



For example, 1.5 is rounded to 2, and 2.5 to 2.

Some image processing functions have additional rounding modes, which are set by the parameter roundMode.