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Luv: singularities fixed

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This commit is contained in:
Rostislav Vasilikhin 2017-07-05 20:36:30 +03:00
parent f670a99270
commit 82811d0706
1 changed files with 55 additions and 29 deletions
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84
modules/imgproc/src/color.cpp
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@ -6495,7 +6495,7 @@ struct RGB2Luv_f
coeffs[i*3] + coeffs[i*3+1] + coeffs[i*3+2] < 1.5f );
}
float d = 1.f/(whitept[0] + whitept[1]*15 + whitept[2]*3);
float d = 1.f/std::max(whitept[0] + whitept[1]*15 + whitept[2]*3, FLT_EPSILON);
un = 4*whitept[0]*d*13;
vn = 9*whitept[1]*d*13;
@ -6755,9 +6755,9 @@ struct Luv2RGB_f
coeffs[i+blueIdx*3] = _coeffs[i+6];
}
float d = 1.f/(whitept[0] + whitept[1]*15 + whitept[2]*3);
un = 4*whitept[0]*d;
vn = 9*whitept[1]*d;
float d = 1.f/std::max(whitept[0] + whitept[1]*15 + whitept[2]*3, FLT_EPSILON);
un = 4*13*whitept[0]*d;
vn = 9*13*whitept[1]*d;
#if CV_SSE2
haveSIMD = checkHardwareSupport(CV_CPU_SSE2);
#endif
@ -6769,23 +6769,42 @@ struct Luv2RGB_f
void process(__m128& v_l0, __m128& v_l1, __m128& v_u0,
__m128& v_u1, __m128& v_v0, __m128& v_v1) const
{
__m128 v_y0 = _mm_mul_ps(_mm_add_ps(v_l0, _mm_set1_ps(16.0f)), _mm_set1_ps(1.f/116.f));
__m128 v_y1 = _mm_mul_ps(_mm_add_ps(v_l1, _mm_set1_ps(16.0f)), _mm_set1_ps(1.f/116.f));
v_y0 = _mm_mul_ps(_mm_mul_ps(v_y0, v_y0), v_y0);
v_y1 = _mm_mul_ps(_mm_mul_ps(v_y1, v_y1), v_y1);
__m128 v_d0 = _mm_div_ps(_mm_set1_ps(1.f/13.f), v_l0);
__m128 v_d1 = _mm_div_ps(_mm_set1_ps(1.f/13.f), v_l1);
v_u0 = _mm_mul_ps(_mm_add_ps(_mm_mul_ps(v_u0, v_d0), _mm_set1_ps(un)), _mm_set1_ps(3.f));
v_u1 = _mm_mul_ps(_mm_add_ps(_mm_mul_ps(v_u1, v_d1), _mm_set1_ps(un)), _mm_set1_ps(3.f));
v_v0 = _mm_add_ps(_mm_mul_ps(v_v0, v_d0), _mm_set1_ps(vn));
v_v1 = _mm_add_ps(_mm_mul_ps(v_v1, v_d1), _mm_set1_ps(vn));
__m128 v_iv0 = _mm_div_ps(_mm_set1_ps(0.25f), v_v0);
__m128 v_iv1 = _mm_div_ps(_mm_set1_ps(0.25f), v_v1);
__m128 v_x0 = _mm_mul_ps(_mm_mul_ps(_mm_set1_ps(3.f), v_u0), v_iv0);
__m128 v_x1 = _mm_mul_ps(_mm_mul_ps(_mm_set1_ps(3.f), v_u1), v_iv1);
__m128 v_z0 = _mm_mul_ps(_mm_sub_ps(_mm_sub_ps(_mm_set1_ps(12.f), v_u0), _mm_mul_ps(_mm_set1_ps(20.f), v_v0)), v_iv0);
__m128 v_z1 = _mm_mul_ps(_mm_sub_ps(_mm_sub_ps(_mm_set1_ps(12.f), v_u1), _mm_mul_ps(_mm_set1_ps(20.f), v_v1)), v_iv1);
// L*(3./29.)^3
__m128 v_y00 = _mm_mul_ps(v_l0, _mm_set1_ps(1.0f/903.3f));
__m128 v_y01 = _mm_mul_ps(v_l1, _mm_set1_ps(1.0f/903.3f));
// ((L + 16)/116)^3
__m128 v_y10 = _mm_mul_ps(_mm_add_ps(v_l0, _mm_set1_ps(16.0f)), _mm_set1_ps(1.f/116.f));
__m128 v_y11 = _mm_mul_ps(_mm_add_ps(v_l1, _mm_set1_ps(16.0f)), _mm_set1_ps(1.f/116.f));
v_y10 = _mm_mul_ps(_mm_mul_ps(v_y10, v_y10), v_y10);
v_y11 = _mm_mul_ps(_mm_mul_ps(v_y11, v_y11), v_y11);
// Y = (L <= 8) ? Y0 : Y1;
__m128 v_cmpl0 = _mm_cmplt_ps(v_l0, _mm_set1_ps(8.f));
__m128 v_cmpl1 = _mm_cmplt_ps(v_l1, _mm_set1_ps(8.f));
v_y00 = _mm_and_ps(v_cmpl0, v_y00);
v_y01 = _mm_and_ps(v_cmpl1, v_y01);
v_y10 = _mm_andnot_ps(v_cmpl0, v_y10);
v_y11 = _mm_andnot_ps(v_cmpl1, v_y11);
__m128 v_y0 = _mm_or_ps(v_y00, v_y10);
__m128 v_y1 = _mm_or_ps(v_y01, v_y11);
// up = 3*(u + L*_un);
__m128 v_up0 = _mm_mul_ps(_mm_set1_ps(3.f), _mm_add_ps(v_u0, _mm_mul_ps(v_l0, _mm_set1_ps(un))));
__m128 v_up1 = _mm_mul_ps(_mm_set1_ps(3.f), _mm_add_ps(v_u1, _mm_mul_ps(v_l1, _mm_set1_ps(un))));
// vp = 0.25/(v + L*_vn);
__m128 v_vp0 = _mm_div_ps(_mm_set1_ps(0.25f), _mm_add_ps(v_v0, _mm_mul_ps(v_l0, _mm_set1_ps(vn))));
__m128 v_vp1 = _mm_div_ps(_mm_set1_ps(0.25f), _mm_add_ps(v_v1, _mm_mul_ps(v_l1, _mm_set1_ps(vn))));
// vp = max(-0.25, min(0.25, vp));
v_vp0 = _mm_max_ps(v_vp0, _mm_set1_ps(-0.25f));
v_vp1 = _mm_max_ps(v_vp1, _mm_set1_ps(-0.25f));
v_vp0 = _mm_min_ps(v_vp0, _mm_set1_ps( 0.25f));
v_vp1 = _mm_min_ps(v_vp1, _mm_set1_ps( 0.25f));
//X = 3*up*vp; // (*Y) is done later
__m128 v_x0 = _mm_mul_ps(_mm_set1_ps(3.f), _mm_mul_ps(v_up0, v_vp0));
__m128 v_x1 = _mm_mul_ps(_mm_set1_ps(3.f), _mm_mul_ps(v_up1, v_vp1));
//Z = ((12*13*L - up)*vp - 5); // (*Y) is done later
__m128 v_z0 = _mm_sub_ps(_mm_mul_ps(_mm_sub_ps(_mm_mul_ps(_mm_set1_ps(12.f*13.f), v_l0), v_up0), v_vp0), _mm_set1_ps(5.f));
__m128 v_z1 = _mm_sub_ps(_mm_mul_ps(_mm_sub_ps(_mm_mul_ps(_mm_set1_ps(12.f*13.f), v_l1), v_up1), v_vp1), _mm_set1_ps(5.f));
// R = (X*C0 + C1 + Z*C2)*Y; // here (*Y) is done
v_l0 = _mm_mul_ps(v_x0, _mm_set1_ps(coeffs[0]));
v_l1 = _mm_mul_ps(v_x1, _mm_set1_ps(coeffs[0]));
v_u0 = _mm_mul_ps(v_x0, _mm_set1_ps(coeffs[3]));
@ -6902,15 +6921,22 @@ struct Luv2RGB_f
#endif
for( ; i < n; i += 3, dst += dcn )
{
float L = src[i], u = src[i+1], v = src[i+2], d, X, Y, Z;
Y = (L + 16.f) * (1.f/116.f);
Y = Y*Y*Y;
d = (1.f/13.f)/L;
u = u*d + _un;
v = v*d + _vn;
float iv = 1.f/v;
X = 2.25f * u * Y * iv ;
Z = (12 - 3 * u - 20 * v) * Y * 0.25f * iv;
float L = src[i], u = src[i+1], v = src[i+2], X, Y, Z;
if(L >= 8)
{
Y = (L + 16.f) * (1.f/116.f);
Y = Y*Y*Y;
}
else
{
Y = L * (1.0f/903.3f); // L*(3./29.)^3
}
float up = 3.f*(u + L*_un);
float vp = 0.25f/(v + L*_vn);
if(vp > 0.25f) vp = 0.25f;
if(vp < -0.25f) vp = -0.25f;
X = Y*3.f*up*vp;
Z = Y*(((12.f*13.f)*L - up)*vp - 5.f);
float R = X*C0 + Y*C1 + Z*C2;
float G = X*C3 + Y*C4 + Z*C5;