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Fix Laplacian kernel precision for double inputs

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This commit is contained in:
Kavyansh Tyagi
2026-02-03 13:32:34 +05:30
parent 227b751f48
commit 1d5f28a44f
1 changed files with 17 additions and 12 deletions
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modules/imgproc/src/deriv.cpp
+17 -12
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@@ -715,15 +715,30 @@ void cv::Laplacian( InputArray _src, OutputArray _dst, int ddepth, int ksize,
ddepth = sdepth;
_dst.create( _src.size(), CV_MAKETYPE(ddepth, cn) );
int ktype = std::max(CV_32F, std::max(ddepth, sdepth));
Mat kernel;
if( ksize == 1 || ksize == 3 )
{
float K[2][9] =
static const double K[2][9] =
{
{ 0, 1, 0, 1, -4, 1, 0, 1, 0 },
{ 2, 0, 2, 0, -8, 0, 2, 0, 2 }
};
Mat kernel(3, 3, CV_32F, K[ksize == 3]);
kernel.create(3, 3, ktype);
if (ktype == CV_32F)
{
float* kptr = kernel.ptr<float>();
for (int i = 0; i < 9; ++i)
kptr[i] = static_cast<float>(K[ksize == 3][i]);
}
else
{
double* kptr = kernel.ptr<double>();
for (int i = 0; i < 9; ++i)
kptr[i] = K[ksize == 3][i];
}
if( scale != 1 )
kernel *= scale;
@@ -735,20 +750,10 @@ void cv::Laplacian( InputArray _src, OutputArray _dst, int ddepth, int ksize,
if( ksize == 1 || ksize == 3 )
{
float K[2][9] =
{
{ 0, 1, 0, 1, -4, 1, 0, 1, 0 },
{ 2, 0, 2, 0, -8, 0, 2, 0, 2 }
};
Mat kernel(3, 3, CV_32F, K[ksize == 3]);
if( scale != 1 )
kernel *= scale;
filter2D( _src, _dst, ddepth, kernel, Point(-1, -1), delta, borderType );
}
else
{
int ktype = std::max(CV_32F, std::max(ddepth, sdepth));
int wdepth = sdepth == CV_8U && ksize <= 5 ? CV_16S : sdepth <= CV_32F ? CV_32F : CV_64F;
int wtype = CV_MAKETYPE(wdepth, cn);
Mat kd, ks;