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fix data overflow problem in GaussianBlur

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This commit is contained in:
Xinguang Bian 2021-05-21 15:17:20 +08:00
parent 5f4e55bc68
commit 7499a15c92
2 changed files with 14 additions and 1 deletions
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6
modules/imgproc/src/smooth.simd.hpp
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@ -1236,8 +1236,12 @@ void hlineSmoothONa_yzy_a<uint16_t, ufixedpoint32>(const uint16_t* src, int cn,
v_mul_expand(vx_load(src + pre_shift * cn), vx_setall_u16((uint16_t) *((uint32_t*)(m + pre_shift))), v_res0, v_res1);
for (int j = 0; j < pre_shift; j ++)
{
v_uint16 v_weight = vx_setall_u16((uint16_t) *((uint32_t*)(m + j)));
v_uint32 v_add0, v_add1;
v_mul_expand(vx_load(src + j * cn) + vx_load(src + (n - 1 - j)*cn), vx_setall_u16((uint16_t) *((uint32_t*)(m + j))), v_add0, v_add1);
v_mul_expand(vx_load(src + j * cn), v_weight, v_add0, v_add1);
v_res0 += v_add0;
v_res1 += v_add1;
v_mul_expand(vx_load(src + (n - 1 - j)*cn), v_weight, v_add0, v_add1);
v_res0 += v_add0;
v_res1 += v_add1;
}

9
modules/imgproc/test/test_smooth_bitexact.cpp
View File

@ -220,6 +220,15 @@ TEST(GaussianBlur_Bitexact, regression_15015)
ASSERT_EQ(0.0, cvtest::norm(dst, src, NORM_INF));
}
TEST(GaussianBlur_Bitexact, overflow_20121)
{
Mat src(100, 100, CV_16UC1, Scalar(65535));
Mat dst;
GaussianBlur(src, dst, cv::Size(9, 9), 0.0);
double min_val;
minMaxLoc(dst, &min_val);
ASSERT_EQ(cvRound(min_val), 65535);
}
static void checkGaussianBlur_8Uvs32F(const Mat& src8u, const Mat& src32f, int N, double sigma)
{