From 6c2f8663090cde1a0085e2ffdf444ce50a27a1a4 Mon Sep 17 00:00:00 2001
From: Paul B Mahol <onemda@gmail.com>
Date: Mon, 18 Nov 2019 23:20:18 +0100
Subject: [PATCH] avfilter/vf_bm3d: improve threshold scaling with different
 block_size and depth

---
 libavfilter/vf_bm3d.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavfilter/vf_bm3d.c b/libavfilter/vf_bm3d.c
index 2343f2e114..e5d2b8bc63 100644
--- a/libavfilter/vf_bm3d.c
+++ b/libavfilter/vf_bm3d.c
@@ -443,7 +443,7 @@ static void basic_block_filtering(BM3DContext *s, const uint8_t *src, int src_li
         }
     }
 
-    threshold[0] = s->hard_threshold * s->sigma;
+    threshold[0] = s->hard_threshold * s->sigma * M_SQRT2 * block_size * block_size * (1 << (s->depth - 8)) / 255.f;
     threshold[1] = threshold[0] * sqrtf(2.f);
     threshold[2] = threshold[0] * 2.f;
     threshold[3] = threshold[0] * sqrtf(8.f);