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ippStsEvenMedianMaskSize
Why a median window needs a center
A median filter orders the samples inside its window and selects the middle rank. An odd number of samples gives one unambiguous center element. IPP accepts an even mask length by replacing it with an odd value and reports this warning, so the call can produce valid output that does not use the requested footprint.
The important diagnostic value is the silent parameter correction. Two implementations can disagree at image edges or around impulses if one rejects the mask and another adjusts it.
What to record
- The mask length requested by the caller and the effective odd mask documented for the selected primitive.
- The anchor and border policy, because both affect which samples enter the median near boundaries.
- Whether the same mask is used for buffer-size calculation, initialization, and execution.
- For tiled processing, ensure the halo is based on the effective mask rather than the rejected even value.
References
Intel IPP error reporting · Intel IPP Developer Guide: FilterMedian · OpenCV image filtering
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