From: Steinar H. Gunderson <sgunderson@bigfoot.com>
Date: Wed, 25 Jul 2018 23:43:30 +0000 (+0200)
Subject: Tweak the default variational refinement weights (optimized on alley_2).
X-Git-Tag: 1.8.0~76^2~175
X-Git-Url: https://git.sesse.net/?a=commitdiff_plain;h=497a76fbb8ce54012aef4b7c7161e07f6a5a9743;p=nageru

Tweak the default variational refinement weights (optimized on alley_2).
---

diff --git a/flow.cpp b/flow.cpp
index b6f0517..3cbbb71 100644
--- a/flow.cpp
+++ b/flow.cpp
@@ -37,7 +37,11 @@ constexpr unsigned patch_size_pixels = 12;
 // Weighting constants for the different parts of the variational refinement.
 // These don't correspond 1:1 to the values given in the DIS paper,
 // since we have different normalizations and ranges in some cases.
-float vr_gamma = 10.0f, vr_delta = 5.0f, vr_alpha = 10.0f;
+// These are found through a simple grid search on some MPI-Sintel data,
+// although the error (EPE) seems to be fairly insensitive to the precise values.
+// Only the relative values matter, so we fix alpha (the smoothness constant)
+// at unity and tweak the others.
+float vr_alpha = 1.0f, vr_delta = 0.25f, vr_gamma = 0.25f;
 
 bool enable_timing = true;
 bool enable_variational_refinement = true;  // Just for debugging.