What does Intel IPP status 38 (ippStsSymKernelExpected) mean?

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: The selected IPP filter requires symmetric coefficients, but the kernel is asymmetric.

Could be also:
Constant	Type	OS
ERROR_HANDLE_EOF	Win32 error	Windows
KERN_LOCK_SET_DESTROYED	Kern return	Mac
ENOSYS	errno	Linux
ENOTSOCK	errno	Mac
EL2NSYNC	errno	Solaris
ENAMETOOLONG	errno	Windows
CDFS_FILE_SYSTEM	BugCheck Code	Windows

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ippStsUnknownCacheSize	ippStsEvenMedianWeight

ippStsSymKernelExpected

A specialized filter contract

Some optimized filtering paths store or evaluate only half of a symmetric kernel. The coefficients must mirror around the center. This warning means the supplied taps do not satisfy that contract; it does not mean that every convolution kernel must be symmetric.

If asymmetry is intentional, use a general filtering primitive. Forcing coefficients to match can change phase and frequency response.

What to inspect

Compare tap i with the mirrored tap at n - 1 - i.
For floating-point coefficients, use a tolerance appropriate to how the taps were generated rather than bytewise equality.
Check coefficient order; a reversed half-kernel can look asymmetric even when the mathematical filter is symmetric.
Use the same kernel representation during size calculation, initialization, and execution.

References

Intel IPP image processing reference · Intel IPP error reporting · OpenCV filtering functions

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