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core: follow IEEE 754 rules for floating-point division

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Alexander Alekhin
2018-10-14 00:37:10 +00:00
parent 09cb329d73
commit fd832bb57d
5 changed files with 63 additions and 58 deletions
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modules/core/include/opencv2/core.hpp
+7 -2
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@@ -415,8 +415,13 @@ The function cv::divide divides one array by another:
or a scalar by an array when there is no src1 :
\f[\texttt{dst(I) = saturate(scale/src2(I))}\f]
When src2(I) is zero, dst(I) will also be zero. Different channels of
multi-channel arrays are processed independently.
Different channels of multi-channel arrays are processed independently.
For integer types when src2(I) is zero, dst(I) will also be zero.
@note In case of floating point data there is no special defined behavior for zero src2(I) values.
Regular floating-point division is used.
Expect correct IEEE-754 behaviour for floating-point data (with NaN, Inf result values).
@note Saturation is not applied when the output array has the depth CV_32S. You may even get
result of an incorrect sign in the case of overflow.