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Added LUT for FP16 and accuracy test #25787

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Merged
merged 1 commit into from
Jun 20, 2024
Merged

Added LUT for FP16 and accuracy test #25787

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7 changes: 6 additions & 1 deletion modules/core/src/lut.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -56,6 +56,11 @@ static void LUT8u_32s( const uchar* src, const int* lut, int* dst, int len, int
LUT8u_( src, lut, dst, len, cn, lutcn );
}

static void LUT8u_16f( const uchar* src, const hfloat* lut, hfloat* dst, int len, int cn, int lutcn )
{
LUT8u_( src, lut, dst, len, cn, lutcn );
}

static void LUT8u_32f( const uchar* src, const float* lut, float* dst, int len, int cn, int lutcn )
{
LUT8u_( src, lut, dst, len, cn, lutcn );
Expand All @@ -71,7 +76,7 @@ typedef void (*LUTFunc)( const uchar* src, const uchar* lut, uchar* dst, int len
static LUTFunc lutTab[CV_DEPTH_MAX] =
{
(LUTFunc)LUT8u_8u, (LUTFunc)LUT8u_8s, (LUTFunc)LUT8u_16u, (LUTFunc)LUT8u_16s,
(LUTFunc)LUT8u_32s, (LUTFunc)LUT8u_32f, (LUTFunc)LUT8u_64f, 0
(LUTFunc)LUT8u_32s, (LUTFunc)LUT8u_32f, (LUTFunc)LUT8u_64f, (LUTFunc)LUT8u_16f
};

#ifdef HAVE_OPENCL
Expand Down
98 changes: 98 additions & 0 deletions modules/core/test/test_arithm.cpp
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Expand Up @@ -3196,5 +3196,103 @@ INSTANTIATE_TEST_CASE_P(Core_CartPolar, Core_PolarToCart_inplace,
)
);

CV_ENUM(LutMatType, CV_8U, CV_16U, CV_16F, CV_32S, CV_32F, CV_64F)

struct Core_LUT: public testing::TestWithParam<LutMatType>
{
template<typename T, int ch>
cv::Mat referenceWithType(cv::Mat input, cv::Mat table)
{
cv::Mat ref(input.size(), CV_MAKE_TYPE(table.type(), ch));
for (int i = 0; i < input.rows; i++)
{
for (int j = 0; j < input.cols; j++)
{
if(ch == 1)
{
ref.at<T>(i, j) = table.at<T>(input.at<uchar>(i, j));
}
else
{
Vec<T, ch> val;
for (int k = 0; k < ch; k++)
{
val[k] = table.at<T>(input.at<Vec<uchar, ch>>(i, j)[k]);
}
ref.at<Vec<T, ch>>(i, j) = val;
}
}
}
return ref;
}

template<int ch = 1>
cv::Mat reference(cv::Mat input, cv::Mat table)
{
if (table.type() == CV_8U)
{
return referenceWithType<uchar, ch>(input, table);
}
else if (table.type() == CV_16U)
{
return referenceWithType<ushort, ch>(input, table);
}
else if (table.type() == CV_16F)
{
return referenceWithType<ushort, ch>(input, table);
}
else if (table.type() == CV_32S)
{
return referenceWithType<int, ch>(input, table);
}
else if (table.type() == CV_32F)
{
return referenceWithType<float, ch>(input, table);
}
else if (table.type() == CV_64F)
{
return referenceWithType<double, ch>(input, table);
}

return cv::Mat();
}
};

TEST_P(Core_LUT, accuracy)
{
int type = GetParam();
cv::Mat input(117, 113, CV_8UC1);
randu(input, 0, 256);

cv::Mat table(1, 256, CV_MAKE_TYPE(type, 1));
randu(table, 0, 127);

cv::Mat output;
cv::LUT(input, table, output);

cv::Mat gt = reference(input, table);

ASSERT_EQ(0, cv::norm(output, gt, cv::NORM_INF));
}

TEST_P(Core_LUT, accuracy_multi)
{
int type = (int)GetParam();
cv::Mat input(117, 113, CV_8UC3);
randu(input, 0, 256);

cv::Mat table(1, 256, CV_MAKE_TYPE(type, 1));
randu(table, 0, 127);

cv::Mat output;
cv::LUT(input, table, output);

cv::Mat gt = reference<3>(input, table);

ASSERT_EQ(0, cv::norm(output, gt, cv::NORM_INF));
}


INSTANTIATE_TEST_CASE_P(/**/, Core_LUT, LutMatType::all());

}} // namespace