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magic constants explained

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This commit is contained in:
Rostislav Vasilikhin
2017-07-06 00:23:58 +03:00
parent 704c688225
commit aa621d6f3c
2 changed files with 8 additions and 0 deletions
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modules/imgproc/src/color.cpp
+4
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@@ -7011,6 +7011,8 @@ struct RGB2Luv_b
const float* _whitept, bool _srgb )
: srccn(_srccn), cvt(3, blueIdx, _coeffs, _whitept, _srgb)
{
//0.72033 = 255/(220+134), 96.525 = 134*255/(220+134)
//0.9732 = 255/(140+122), 136.259 = 140*255/(140+122)
#if CV_NEON
v_scale_inv = vdupq_n_f32(1.f/255.f);
v_scale = vdupq_n_f32(2.55f);
@@ -7211,6 +7213,8 @@ struct Luv2RGB_b
const float* _whitept, bool _srgb )
: dstcn(_dstcn), cvt(3, blueIdx, _coeffs, _whitept, _srgb )
{
// 1.388235294117647 = (220+134)/255
// 1.027450980392157 = (140+122)/255
#if CV_NEON
v_scale_inv = vdupq_n_f32(100.f/255.f);
v_coeff1 = vdupq_n_f32(1.388235294117647f);