avfilter: add temporal midway equalizer filter

FFmpeg · Jan 1, 2021 · 54cd025 · 54cd025
1 parent 63505fc
commit 54cd025
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Showing 6 changed files with 466 additions and 1 deletion.
diff --git a/Changelog b/Changelog
@@ -54,6 +54,7 @@ version <next>:
 - AV1 monochrome encoding support via libaom >= 2.0.1
 - asuperpass and asuperstop filter
 - shufflepixels filter
+- tmidequalizer filter
 
 
 version 4.3:

diff --git a/doc/filters.texi b/doc/filters.texi
@@ -19323,6 +19323,28 @@ minimum values, and @code{1} maximum values.
 
 This filter supports all above options as @ref{commands}, excluding option @code{radius}.
 
+@section tmidequalizer
+
+Apply Temporal Midway Video Equalization effect.
+
+Midway Video Equalization adjusts a sequence of video frames to have the same
+histograms, while maintaining their dynamics as much as possible. It's
+useful for e.g. matching exposures from a video frames sequence.
+
+This filter accepts the following option:
+
+@table @option
+@item radius
+Set filtering radius. Default is @code{5}. Allowed range is from 1 to 127.
+
+@item sigma
+Set filtering sigma. Default is @code{0.5}. This controls strength of filtering.
+Setting this option to 0 effectively does nothing.
+
+@item planes
+Set which planes to process. Default is @code{15}, which is all available planes.
+@end table
+
 @section tmix
 
 Mix successive video frames.

diff --git a/libavfilter/Makefile b/libavfilter/Makefile
@@ -433,6 +433,7 @@ OBJS-$(CONFIG_TILE_FILTER)                   += vf_tile.o
 OBJS-$(CONFIG_TINTERLACE_FILTER)             += vf_tinterlace.o
 OBJS-$(CONFIG_TLUT2_FILTER)                  += vf_lut2.o framesync.o
 OBJS-$(CONFIG_TMEDIAN_FILTER)                += vf_xmedian.o framesync.o
+OBJS-$(CONFIG_TMIDEQUALIZER_FILTER)          += vf_tmidequalizer.o
 OBJS-$(CONFIG_TMIX_FILTER)                   += vf_mix.o framesync.o
 OBJS-$(CONFIG_TONEMAP_FILTER)                += vf_tonemap.o colorspace.o
 OBJS-$(CONFIG_TONEMAP_OPENCL_FILTER)         += vf_tonemap_opencl.o colorspace.o opencl.o \

diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
@@ -413,6 +413,7 @@ extern AVFilter ff_vf_tile;
 extern AVFilter ff_vf_tinterlace;
 extern AVFilter ff_vf_tlut2;
 extern AVFilter ff_vf_tmedian;
+extern AVFilter ff_vf_tmidequalizer;
 extern AVFilter ff_vf_tmix;
 extern AVFilter ff_vf_tonemap;
 extern AVFilter ff_vf_tonemap_opencl;

diff --git a/libavfilter/version.h b/libavfilter/version.h
@@ -30,7 +30,7 @@
 #include "libavutil/version.h"
 
 #define LIBAVFILTER_VERSION_MAJOR   7
-#define LIBAVFILTER_VERSION_MINOR  94
+#define LIBAVFILTER_VERSION_MINOR  95
 #define LIBAVFILTER_VERSION_MICRO 100