[x265] [PATCH] lambda: New 8-bit lambda2 table

[Pradeep Ramachandran]

# HG changeset patch
# User Pradeep Ramachandran <pradeep at multicorewareinc.com>
# Date 1489382943 -19800
#      Mon Mar 13 10:59:03 2017 +0530
# Node ID 080c27ef4bb8d9a51cac2f4e9e12ad4b3cf9bae1
# Parent  88fd9082764c7d7b4668e30763a93215980efd70
lambda: New 8-bit lambda2 table.

Considerably improves subjective visual quality.

diff -r 88fd9082764c -r 080c27ef4bb8 source/common/constants.cpp
--- a/source/common/constants.cpp	Wed Mar 08 17:15:59 2017 +0530
+++ b/source/common/constants.cpp	Mon Mar 13 10:59:03 2017 +0530
@@ -129,24 +129,24 @@
     456.1401, 512.0000, 574.7006, 645.0796, 724.0773
 };
 
-// lambda2 = pow(lambda, 2) * scale (0.85);
+// lambda2 = 0.038 * pow(0.234, QP)
 double x265_lambda2_tab[QP_MAX_MAX + 1] =
 {
-    0.0531, 0.0669, 0.0843, 0.1063, 0.1339,
-    0.1687, 0.2125, 0.2677, 0.3373, 0.4250,
-    0.5355, 0.6746, 0.8500, 1.0709, 1.3493,
-    1.7000, 2.1419, 2.6986, 3.4000, 4.2837,
-    5.3970, 6.8000, 8.5675, 10.7943, 13.6000,
-    17.1345, 21.5887, 27.2004, 34.2699, 43.1773,
-    54.4000, 68.5397, 86.3551, 108.7998, 137.0792,
-    172.7097, 217.6000, 274.1590, 345.4172, 435.1993,
-    548.3169, 690.8389, 870.4000, 1096.6362, 1381.6757,
-    1740.7974, 2193.2676, 2763.3460, 3481.6000, 4386.5446,
-    5526.6890, 6963.2049, 8773.0879, 11053.3840, 13926.4000,
-    17546.1542, 22106.7835, 27852.7889, 35092.3170, 44213.5749,
-    55705.6000, 70184.6657, 88427.1342, 111411.2172, 140369.3373,
-    176854.2222, 222822.4000, 280738.6627, 353708.5368, 445644.7459
-};
+    0.0380, 0.0480, 0.0606, 0.0766, 0.0968,
+    0.1224, 0.1547, 0.1955, 0.2470, 0.3121,
+    0.3944, 0.4984, 0.6299, 0.7959, 1.0058,
+    1.2710, 1.6061, 2.0295, 2.5646, 3.2408,
+    4.0952, 5.1749, 6.5393, 8.2633, 10.4419,
+    13.1949, 16.6736, 21.0695, 26.6244, 33.6438,
+    42.5138, 53.7224, 67.8860, 85.7838, 108.4003,
+    136.9794, 173.0933, 218.7284, 276.3949, 349.2649,
+    441.3467, 557.7054, 704.7413, 890.5425, 1125.3291,
+    1422.0160, 1796.9227, 2270.6714, 2869.3215, 3625.8023,
+    4581.7251, 5789.6717, 7316.0868, 9244.9328, 11682.3084,
+    14762.2847, 18654.2798, 23572.3779, 29787.1055, 37640.3119,
+    47563.9728, 60103.9523, 75950.0283, 95973.8349, 121276.8079,
+    153250.7703, 193654.4919, 244710.4321, 309226.9897, 390752.9823
+};
 
 #endif
 
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