avfilter: add erosion, dilation, deflate & inflate filter

Signed-off-by: Paul B Mahol <onemda@gmail.com>

Changelog

@@ -16,6 +16,7 @@ version <next>:
 - removegrain video filter
 - Intel QSV-accelerated MPEG-2 video and HEVC encoding
 - libkvazaar HEVC encoder
+- erosion, dilation, deflate and inflate video filters
 
 
 version 2.7:

doc/filters.texi

@@ -3718,6 +3718,24 @@ Set whether or not chroma is considered in the metric calculations. Default is
 @code{1}.
 @end table
 
+@section deflate
+
+Apply deflate effect to the video.
+
+This filter replaces the pixel by the local(3x3) average by taking into account
+only values lower than the pixel.
+
+It accepts the following options:
+
+@table @option
+@item threshold0
+@item threshold1
+@item threshold2
+@item threshold3
+Allows to limit the maximum change for each plane, default is 65535.
+If 0, plane will remain unchanged.
+@end table
+
 @section dejudder
 
 Remove judder produced by partially interlaced telecined content.
@@ -3904,6 +3922,33 @@ A number representing position of the first frame with respect to the telecine
 pattern. This is to be used if the stream is cut. The default value is @code{0}.
 @end table
 
+@section dilation
+
+Apply dilation effect to the video.
+
+This filter replaces the pixel by the local(3x3) maximum.
+
+It accepts the following options:
+
+@table @option
+@item threshold0
+@item threshold1
+@item threshold2
+@item threshold3
+Allows to limit the maximum change for each plane, default is 65535.
+If 0, plane will remain unchanged.
+
+@item coordinates
+Flag which specifies the pixel to refer to. Default is 255 i.e. all eight
+pixels are used.
+
+Flags to local 3x3 coordinates maps like this:
+
+    1 2 3
+    4   5
+    6 7 8
+@end table
+
 @section drawbox
 
 Draw a colored box on the input image.
@@ -4759,6 +4804,33 @@ value.
 
 @end table
 
+@section erosion
+
+Apply erosion effect to the video.
+
+This filter replaces the pixel by the local(3x3) minimum.
+
+It accepts the following options:
+
+@table @option
+@item threshold0
+@item threshold1
+@item threshold2
+@item threshold3
+Allows to limit the maximum change for each plane, default is 65535.
+If 0, plane will remain unchanged.
+
+@item coordinates
+Flag which specifies the pixel to refer to. Default is 255 i.e. all eight
+pixels are used.
+
+Flags to local 3x3 coordinates maps like this:
+
+    1 2 3
+    4   5
+    6 7 8
+@end table
+
 @section extractplanes
 
 Extract color channel components from input video stream into
@@ -6356,6 +6428,24 @@ Default value is @code{none}.
 Swap luma/chroma/alpha fields. Exchange even & odd lines. Default value is @code{0}.
 @end table
 
+@section inflate
+
+Apply inflate effect to the video.
+
+This filter replaces the pixel by the local(3x3) average by taking into account
+only values higher than the pixel.
+
+It accepts the following options:
+
+@table @option
+@item threshold0
+@item threshold1
+@item threshold2
+@item threshold3
+Allows to limit the maximum change for each plane, default is 65535.
+If 0, plane will remain unchanged.
+@end table
+
 @section interlace
 
 Simple interlacing filter from progressive contents. This interleaves upper (or

libavfilter/Makefile

@@ -112,10 +112,12 @@ OBJS-$(CONFIG_CROPDETECT_FILTER)             += vf_cropdetect.o
 OBJS-$(CONFIG_CURVES_FILTER)                 += vf_curves.o
 OBJS-$(CONFIG_DCTDNOIZ_FILTER)               += vf_dctdnoiz.o
 OBJS-$(CONFIG_DECIMATE_FILTER)               += vf_decimate.o
+OBJS-$(CONFIG_DEFLATE_FILTER)                += vf_neighbor.o
 OBJS-$(CONFIG_DEJUDDER_FILTER)               += vf_dejudder.o
 OBJS-$(CONFIG_DELOGO_FILTER)                 += vf_delogo.o
 OBJS-$(CONFIG_DESHAKE_FILTER)                += vf_deshake.o
 OBJS-$(CONFIG_DETELECINE_FILTER)             += vf_detelecine.o
+OBJS-$(CONFIG_DILATION_FILTER)               += vf_neighbor.o
 OBJS-$(CONFIG_DRAWBOX_FILTER)                += vf_drawbox.o
 OBJS-$(CONFIG_DRAWGRAPH_FILTER)              += f_drawgraph.o
 OBJS-$(CONFIG_DRAWGRID_FILTER)               += vf_drawbox.o
@@ -123,6 +125,7 @@ OBJS-$(CONFIG_DRAWTEXT_FILTER)               += vf_drawtext.o
 OBJS-$(CONFIG_ELBG_FILTER)                   += vf_elbg.o
 OBJS-$(CONFIG_EDGEDETECT_FILTER)             += vf_edgedetect.o
 OBJS-$(CONFIG_EQ_FILTER)                     += vf_eq.o
+OBJS-$(CONFIG_EROSION_FILTER)                += vf_neighbor.o
 OBJS-$(CONFIG_EXTRACTPLANES_FILTER)          += vf_extractplanes.o
 OBJS-$(CONFIG_FADE_FILTER)                   += vf_fade.o
 OBJS-$(CONFIG_FFTFILT_FILTER)                += vf_fftfilt.o
@@ -147,6 +150,7 @@ OBJS-$(CONFIG_HQX_FILTER)                    += vf_hqx.o
 OBJS-$(CONFIG_HUE_FILTER)                    += vf_hue.o
 OBJS-$(CONFIG_IDET_FILTER)                   += vf_idet.o
 OBJS-$(CONFIG_IL_FILTER)                     += vf_il.o
+OBJS-$(CONFIG_INFLATE_FILTER)                += vf_neighbor.o
 OBJS-$(CONFIG_INTERLACE_FILTER)              += vf_interlace.o
 OBJS-$(CONFIG_INTERLEAVE_FILTER)             += f_interleave.o
 OBJS-$(CONFIG_KERNDEINT_FILTER)              += vf_kerndeint.o

libavfilter/allfilters.c

@@ -128,10 +128,12 @@ void avfilter_register_all(void)
     REGISTER_FILTER(CURVES,         curves,         vf);
     REGISTER_FILTER(DCTDNOIZ,       dctdnoiz,       vf);
     REGISTER_FILTER(DECIMATE,       decimate,       vf);
+    REGISTER_FILTER(DEFLATE,        deflate,        vf);
     REGISTER_FILTER(DEJUDDER,       dejudder,       vf);
     REGISTER_FILTER(DELOGO,         delogo,         vf);
     REGISTER_FILTER(DESHAKE,        deshake,        vf);
     REGISTER_FILTER(DETELECINE,     detelecine,     vf);
+    REGISTER_FILTER(DILATION,       dilation,       vf);
     REGISTER_FILTER(DRAWBOX,        drawbox,        vf);
     REGISTER_FILTER(DRAWGRAPH,      drawgraph,      vf);
     REGISTER_FILTER(DRAWGRID,       drawgrid,       vf);
@@ -139,6 +141,7 @@ void avfilter_register_all(void)
     REGISTER_FILTER(EDGEDETECT,     edgedetect,     vf);
     REGISTER_FILTER(ELBG,           elbg,           vf);
     REGISTER_FILTER(EQ,             eq,             vf);
+    REGISTER_FILTER(EROSION,        erosion,        vf);
     REGISTER_FILTER(EXTRACTPLANES,  extractplanes,  vf);
     REGISTER_FILTER(FADE,           fade,           vf);
     REGISTER_FILTER(FFTFILT,        fftfilt,        vf);
@@ -163,6 +166,7 @@ void avfilter_register_all(void)
     REGISTER_FILTER(HUE,            hue,            vf);
     REGISTER_FILTER(IDET,           idet,           vf);
     REGISTER_FILTER(IL,             il,             vf);
+    REGISTER_FILTER(INFLATE,        inflate,        vf);
     REGISTER_FILTER(INTERLACE,      interlace,      vf);
     REGISTER_FILTER(INTERLEAVE,     interleave,     vf);
     REGISTER_FILTER(KERNDEINT,      kerndeint,      vf);

libavfilter/version.h

@@ -30,7 +30,7 @@
 #include "libavutil/version.h"
 
 #define LIBAVFILTER_VERSION_MAJOR  5
-#define LIBAVFILTER_VERSION_MINOR  21
+#define LIBAVFILTER_VERSION_MINOR  22
 #define LIBAVFILTER_VERSION_MICRO 100
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \