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lavfi: add edgedetect filter.

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This commit is contained in:
Clément Bœsch 2012-07-26 19:45:53 +02:00
parent 12d2bbf324
commit 3250231a02
8 changed files with 357 additions and 2 deletions
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1
Changelog
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@ -47,6 +47,7 @@ version next:
- hue filter
- ICO muxer
- SubRip encoder and decoder without embedded timing
- edge detection filter
version 0.11:

27
doc/filters.texi
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@ -1929,6 +1929,33 @@ For more information about libfreetype, check:
For more information about fontconfig, check:
@url{http://freedesktop.org/software/fontconfig/fontconfig-user.html}.
@section edgedetect
Detect and draw edges. The filter uses the Canny Edge Detection algorithm.
This filter accepts the following optional named parameters:
@table @option
@item low, high
Set low and high threshold values used by the Canny thresholding
algorithm.
The high threshold selects the "strong" edge pixels, which are then
connected through 8-connectivity with the "weak" edge pixels selected
by the low threshold.
@var{low} and @var{high} threshold values must be choosen in the range
[0,1], and @var{low} should be lesser or equal to @var{high}.
Default value for @var{low} is @code{20/255}, and default value for @var{high}
is @code{50/255}.
@end table
Example:
@example
edgedetect=low=0.1:high=0.4
@end example
@section fade
Apply fade-in/out effect to input video.

1
libavfilter/Makefile
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@ -90,6 +90,7 @@ OBJS-$(CONFIG_DELOGO_FILTER) += vf_delogo.o
OBJS-$(CONFIG_DESHAKE_FILTER) += vf_deshake.o
OBJS-$(CONFIG_DRAWBOX_FILTER) += vf_drawbox.o
OBJS-$(CONFIG_DRAWTEXT_FILTER) += vf_drawtext.o
OBJS-$(CONFIG_EDGEDETECT_FILTER) += vf_edgedetect.o
OBJS-$(CONFIG_FADE_FILTER) += vf_fade.o
OBJS-$(CONFIG_FIELDORDER_FILTER) += vf_fieldorder.o
OBJS-$(CONFIG_FIFO_FILTER) += fifo.o

1
libavfilter/allfilters.c
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@ -81,6 +81,7 @@ void avfilter_register_all(void)
REGISTER_FILTER (DESHAKE, deshake, vf);
REGISTER_FILTER (DRAWBOX, drawbox, vf);
REGISTER_FILTER (DRAWTEXT, drawtext, vf);
REGISTER_FILTER (EDGEDETECT, edgedetect, vf);
REGISTER_FILTER (FADE, fade, vf);
REGISTER_FILTER (FIELDORDER, fieldorder, vf);
REGISTER_FILTER (FIFO, fifo, vf);

4
libavfilter/version.h
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@ -29,8 +29,8 @@
#include "libavutil/avutil.h"
#define LIBAVFILTER_VERSION_MAJOR 3
#define LIBAVFILTER_VERSION_MINOR 9
#define LIBAVFILTER_VERSION_MICRO 102
#define LIBAVFILTER_VERSION_MINOR 10
#define LIBAVFILTER_VERSION_MICRO 100
#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
LIBAVFILTER_VERSION_MINOR, \

323
libavfilter/vf_edgedetect.c Normal file
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@ -0,0 +1,323 @@
/*
* Copyright (c) 2012 Clément Bœsch
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* Edge detection filter
*
* @url https://en.wikipedia.org/wiki/Canny_edge_detector
*/
#include "libavutil/opt.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
typedef struct {
const AVClass *class;
uint8_t *tmpbuf;
uint16_t *gradients;
char *directions;
double low, high;
uint8_t low_u8, high_u8;
} EdgeDetectContext;
#define OFFSET(x) offsetof(EdgeDetectContext, x)
static const AVOption edgedetect_options[] = {
{ "high", "set high threshold", OFFSET(high), AV_OPT_TYPE_DOUBLE, {.dbl=50/255.}, 0, 1 },
{ "low", "set low threshold", OFFSET(low), AV_OPT_TYPE_DOUBLE, {.dbl=20/255.}, 0, 1 },
{ NULL },
};
AVFILTER_DEFINE_CLASS(edgedetect);
static av_cold int init(AVFilterContext *ctx, const char *args)
{
int ret;
EdgeDetectContext *edgedetect = ctx->priv;
edgedetect->class = &edgedetect_class;
av_opt_set_defaults(edgedetect);
if ((ret = av_set_options_string(edgedetect, args, "=", ":")) < 0)
return ret;
edgedetect->low_u8 = edgedetect->low * 255.;
edgedetect->high_u8 = edgedetect->high * 255.;
return 0;
}
static int query_formats(AVFilterContext *ctx)
{
static const enum PixelFormat pix_fmts[] = {PIX_FMT_GRAY8, PIX_FMT_NONE};
ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
return 0;
}
static int config_props(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
EdgeDetectContext *edgedetect = ctx->priv;
edgedetect->tmpbuf = av_malloc(inlink->w * inlink->h);
edgedetect->gradients = av_calloc(inlink->w * inlink->h, sizeof(*edgedetect->gradients));
edgedetect->directions = av_malloc(inlink->w * inlink->h);
if (!edgedetect->tmpbuf || !edgedetect->gradients || !edgedetect->directions)
return AVERROR(ENOMEM);
return 0;
}
static void gaussian_blur(AVFilterContext *ctx, int w, int h,
uint8_t *dst, int dst_linesize,
const uint8_t *src, int src_linesize)
{
int i, j;
memcpy(dst, src, w); dst += dst_linesize; src += src_linesize;
memcpy(dst, src, w); dst += dst_linesize; src += src_linesize;
for (j = 2; j < h - 2; j++) {
dst[0] = src[0];
dst[1] = src[1];
for (i = 2; i < w - 2; i++) {
/* Gaussian mask of size 5x5 with sigma = 1.4 */
dst[i] = ((src[-2*src_linesize + i-2] + src[2*src_linesize + i-2]) * 2
+ (src[-2*src_linesize + i-1] + src[2*src_linesize + i-1]) * 4
+ (src[-2*src_linesize + i ] + src[2*src_linesize + i ]) * 5
+ (src[-2*src_linesize + i+1] + src[2*src_linesize + i+1]) * 4
+ (src[-2*src_linesize + i+2] + src[2*src_linesize + i+2]) * 2
+ (src[ -src_linesize + i-2] + src[ src_linesize + i-2]) * 4
+ (src[ -src_linesize + i-1] + src[ src_linesize + i-1]) * 9
+ (src[ -src_linesize + i ] + src[ src_linesize + i ]) * 12
+ (src[ -src_linesize + i+1] + src[ src_linesize + i+1]) * 9
+ (src[ -src_linesize + i+2] + src[ src_linesize + i+2]) * 4
+ src[i-2] * 5
+ src[i-1] * 12
+ src[i ] * 15
+ src[i+1] * 12
+ src[i+2] * 5) / 159;
}
dst[i ] = src[i ];
dst[i + 1] = src[i + 1];
dst += dst_linesize;
src += src_linesize;
}
memcpy(dst, src, w); dst += dst_linesize; src += src_linesize;
memcpy(dst, src, w);
}
enum {
DIRECTION_45UP,
DIRECTION_45DOWN,
DIRECTION_HORIZONTAL,
DIRECTION_VERTICAL,
};
static int get_rounded_direction(int gx, int gy)
{
/* reference angles:
* tan( pi/8) = sqrt(2)-1
* tan(3pi/8) = sqrt(2)+1
* Gy/Gx is the tangent of the angle (theta), so Gy/Gx is compared against
* <ref-angle>, or more simply Gy against <ref-angle>*Gx
*
* Gx and Gy bounds = [1020;1020], using 16-bit arithmetic:
* round((sqrt(2)-1) * (1<<16)) = 27146
* round((sqrt(2)+1) * (1<<16)) = 158218
*/
if (gx) {
int tanpi8gx, tan3pi8gx;
if (gx < 0)
gx = -gx, gy = -gy;
gy <<= 16;
tanpi8gx = 27146 * gx;
tan3pi8gx = 158218 * gx;
if (gy > -tan3pi8gx && gy < -tanpi8gx) return DIRECTION_45UP;
if (gy > -tanpi8gx && gy < tanpi8gx) return DIRECTION_HORIZONTAL;
if (gy > tanpi8gx && gy < tan3pi8gx) return DIRECTION_45DOWN;
}
return DIRECTION_VERTICAL;
}
static void sobel(AVFilterContext *ctx, int w, int h,
uint16_t *dst, int dst_linesize,
const uint8_t *src, int src_linesize)
{
int i, j;
EdgeDetectContext *edgedetect = ctx->priv;
for (j = 1; j < h - 1; j++) {
dst += dst_linesize;
src += src_linesize;
for (i = 1; i < w - 1; i++) {
const int gx =
-1*src[-src_linesize + i-1] + 1*src[-src_linesize + i+1]
-2*src[ i-1] + 2*src[ i+1]
-1*src[ src_linesize + i-1] + 1*src[ src_linesize + i+1];
const int gy =
-1*src[-src_linesize + i-1] + 1*src[ src_linesize + i-1]
-2*src[-src_linesize + i ] + 2*src[ src_linesize + i ]
-1*src[-src_linesize + i+1] + 1*src[ src_linesize + i+1];
dst[i] = FFABS(gx) + FFABS(gy);
edgedetect->directions[j*w + i] = get_rounded_direction(gx, gy);
}
}
}
static void non_maximum_suppression(AVFilterContext *ctx, int w, int h,
uint8_t *dst, int dst_linesize,
const uint16_t *src, int src_linesize)
{
int i, j;
EdgeDetectContext *edgedetect = ctx->priv;
#define COPY_MAXIMA(ay, ax, by, bx) do { \
if (src[i] > src[(ay)*src_linesize + i+(ax)] && \
src[i] > src[(by)*src_linesize + i+(bx)]) \
dst[i] = av_clip_uint8(src[i]); \
} while (0)
for (j = 1; j < h - 1; j++) {
dst += dst_linesize;
src += src_linesize;
for (i = 1; i < w - 1; i++) {
switch (edgedetect->directions[j*w + i]) {
case DIRECTION_45UP: COPY_MAXIMA( 1, -1, -1, 1); break;
case DIRECTION_45DOWN: COPY_MAXIMA(-1, -1, 1, 1); break;
case DIRECTION_HORIZONTAL: COPY_MAXIMA( 0, -1, 0, 1); break;
case DIRECTION_VERTICAL: COPY_MAXIMA(-1, 0, 1, 0); break;
}
}
}
}
static void double_threshold(AVFilterContext *ctx, int w, int h,
uint8_t *dst, int dst_linesize,
const uint8_t *src, int src_linesize)
{
int i, j;
EdgeDetectContext *edgedetect = ctx->priv;
const int low = edgedetect->low_u8;
const int high = edgedetect->high_u8;
for (j = 0; j < h; j++) {
for (i = 0; i < w; i++) {
if (src[i] > high) {
dst[i] = src[i];
continue;
}
if ((!i || i == w - 1 || !j || j == h - 1) &&
src[i] > low &&
(src[-src_linesize + i-1] > high ||
src[-src_linesize + i ] > high ||
src[-src_linesize + i+1] > high ||
src[ i-1] > high ||
src[ i+1] > high ||
src[ src_linesize + i-1] > high ||
src[ src_linesize + i ] > high ||
src[ src_linesize + i+1] > high))
dst[i] = src[i];
else
dst[i] = 0;
}
dst += dst_linesize;
src += src_linesize;
}
}
static int end_frame(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
EdgeDetectContext *edgedetect = ctx->priv;
AVFilterLink *outlink = inlink->dst->outputs[0];
AVFilterBufferRef *inpicref = inlink->cur_buf;
AVFilterBufferRef *outpicref = outlink->out_buf;
uint8_t *tmpbuf = edgedetect->tmpbuf;
uint16_t *gradients = edgedetect->gradients;
/* gaussian filter to reduce noise */
gaussian_blur(ctx, inlink->w, inlink->h,
tmpbuf, inlink->w,
inpicref->data[0], inpicref->linesize[0]);
/* compute the 16-bits gradients and directions for the next step */
sobel(ctx, inlink->w, inlink->h,
gradients, inlink->w,
tmpbuf, inlink->w);
/* non_maximum_suppression() will actually keep & clip what's necessary and
* ignore the rest, so we need a clean output buffer */
memset(tmpbuf, 0, inlink->w * inlink->h);
non_maximum_suppression(ctx, inlink->w, inlink->h,
tmpbuf, inlink->w,
gradients, inlink->w);
/* keep high values, or low values surrounded by high values */
double_threshold(ctx, inlink->w, inlink->h,
outpicref->data[0], outpicref->linesize[0],
tmpbuf, inlink->w);
ff_draw_slice(outlink, 0, outlink->h, 1);
return ff_end_frame(outlink);
}
static av_cold void uninit(AVFilterContext *ctx)
{
EdgeDetectContext *edgedetect = ctx->priv;
av_freep(&edgedetect->tmpbuf);
av_freep(&edgedetect->gradients);
av_freep(&edgedetect->directions);
}
static int null_draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir) { return 0; }
AVFilter avfilter_vf_edgedetect = {
.name = "edgedetect",
.description = NULL_IF_CONFIG_SMALL("Detect and draw edge."),
.priv_size = sizeof(EdgeDetectContext),
.init = init,
.uninit = uninit,
.query_formats = query_formats,
.inputs = (const AVFilterPad[]) {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.draw_slice = null_draw_slice,
.config_props = config_props,
.end_frame = end_frame,
.min_perms = AV_PERM_READ
},
{ .name = NULL }
},
.outputs = (const AVFilterPad[]) {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
{ .name = NULL }
},
};

1
tests/lavfi-regression.sh
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@ -42,6 +42,7 @@ do_lavfi "crop_scale" "crop=iw-100:ih-100:100:100,scale=400:-1"
do_lavfi "crop_scale_vflip" "null,null,crop=iw-200:ih-200:200:200,crop=iw-20:ih-20:20:20,scale=200:200,scale=250:250,vflip,vflip,null,scale=200:200,crop=iw-100:ih-100:100:100,vflip,scale=200:200,null,vflip,crop=iw-100:ih-100:100:100,null"
do_lavfi "crop_vflip" "crop=iw-100:ih-100:100:100,vflip"
do_lavfi "drawbox" "drawbox=224:24:88:72:#FF8010@0.5"
do_lavfi "edgedetect" "edgedetect"
do_lavfi "fade" "fade=in:5:15,fade=out:30:15"
do_lavfi "null" "null"
do_lavfi "overlay" "split[m],scale=88:72,pad=96:80:4:4[o2];[m]fifo[o1],[o1][o2]overlay=240:16"

1
tests/ref/lavfi/edgedetect Normal file
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@ -0,0 +1 @@
edgedetect 16bce636eef1a82e18837d176f4187c1