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fix meanStdDev overflow for large images

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shyama7004 2025-02-06 00:30:48 +05:30 committed by Alexander Smorkalov
parent 43cebe52eb
commit 987ba6504b
2 changed files with 15 additions and 1 deletions
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3
modules/core/src/mean.dispatch.cpp
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@ -592,7 +592,8 @@ void meanStdDev(InputArray _src, OutputArray _mean, OutputArray _sdv, InputArray
uchar* ptrs[2] = {};
NAryMatIterator it(arrays, ptrs);
int total = (int)it.size, blockSize = total, intSumBlockSize = 0;
int j, count = 0, nz0 = 0;
int j;
int64_t count = 0, nz0 = 0;
AutoBuffer<double> _buf(cn*4);
double *s = (double*)_buf.data(), *sq = s + cn;
int *sbuf = (int*)s, *sqbuf = (int*)sq;

13
modules/core/test/test_arithm.cpp
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@ -2814,6 +2814,19 @@ TEST(Core_MeanStdDev, regression_multichannel)
}
}
// Related issue : https://github.com/opencv/opencv/issues/26861
TEST(Core_MeanStdDevTest, LargeImage)
{
applyTestTag(CV_TEST_TAG_VERYLONG);
applyTestTag(CV_TEST_TAG_MEMORY_14GB);
// (1<<16) * ((1<<15)+10) = ~2.147 billion
cv::Mat largeImage = cv::Mat::ones((1 << 16), ((1 << 15) + 10), CV_8U);
cv::Scalar mean, stddev;
cv::meanStdDev(largeImage, mean, stddev);
EXPECT_NEAR(mean[0], 1.0, 1e-5);
EXPECT_NEAR(stddev[0], 0.0, 1e-5);
}
template <typename T> static inline
void testDivideInitData(Mat& src1, Mat& src2)
{