mirror of
https://github.com/FFmpeg/FFmpeg.git
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lavfi: add dctdnoiz filter.
This commit is contained in:
Clément Bœsch
parent
48de04f4ec
commit
7b43120c7c
@ -46,6 +46,7 @@ version <next>:
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- RedSpark demuxer
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- ADPCM IMA Radical decoder
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- zmq filters
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- DCT denoiser filter (dctdnoiz)
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version 1.2:
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1
configure
vendored
1
configure
vendored
@ -2129,6 +2129,7 @@ blackframe_filter_deps="gpl"
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boxblur_filter_deps="gpl"
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colormatrix_filter_deps="gpl"
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cropdetect_filter_deps="gpl"
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dctdnoiz_filter_deps="avcodec"
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delogo_filter_deps="gpl"
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deshake_filter_deps="avcodec"
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deshake_filter_select="dsputil"
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@ -2655,6 +2655,59 @@ curves=psfile='MyCurvesPresets/purple.asv':green='0.45/0.53'
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@end example
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@end itemize
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@section dctdnoiz
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Denoise frames using 2D DCT (frequency domain filtering).
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This filter is not designed for real time and can be extremely slow.
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The filter accepts the following options:
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@table @option
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@item sigma, s
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Set the noise sigma constant.
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This @var{sigma} defines a hard threshold of @code{3 * sigma}; every DCT
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coefficient (absolute value) below this threshold with be dropped.
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If you need a more advanced filtering, see @option{expr}.
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Default is @code{0}.
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@item overlap
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Set number overlapping pixels for each block. Each block is of size
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@code{16x16}. Since the filter can be slow, you may want to reduce this value,
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at the cost of a less effective filter and the risk of various artefacts.
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If the overlapping value doesn't allow to process the whole input width or
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height, a warning will be displayed and according borders won't be denoised.
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Default value is @code{15}.
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@item expr, e
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Set the coefficient factor expression.
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For each coefficient of a DCT block, this expression will be evaluated as a
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multiplier value for the coefficient.
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If this is option is set, the @option{sigma} option will be ignored.
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The absolute value of the coefficient can be accessed through the @var{c}
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variable.
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@end table
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@subsection Examples
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Apply a denoise with a @option{sigma} of @code{4.5}:
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@example
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dctdnoiz=4.5
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@end example
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The same operation can be achieved using the expression system:
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@example
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dctdnoiz=e='gte(c, 4.5*3)'
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@end example
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@anchor{decimate}
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@section decimate
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@ -116,6 +116,7 @@ OBJS-$(CONFIG_COPY_FILTER) += vf_copy.o
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OBJS-$(CONFIG_CROP_FILTER) += vf_crop.o
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OBJS-$(CONFIG_CROPDETECT_FILTER) += vf_cropdetect.o
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OBJS-$(CONFIG_CURVES_FILTER) += vf_curves.o
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OBJS-$(CONFIG_DCTDNOIZ_FILTER) += vf_dctdnoiz.o
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OBJS-$(CONFIG_DECIMATE_FILTER) += vf_decimate.o
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OBJS-$(CONFIG_DELOGO_FILTER) += vf_delogo.o
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OBJS-$(CONFIG_DESHAKE_FILTER) += vf_deshake.o
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@ -114,6 +114,7 @@ void avfilter_register_all(void)
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REGISTER_FILTER(CROP, crop, vf);
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REGISTER_FILTER(CROPDETECT, cropdetect, vf);
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REGISTER_FILTER(CURVES, curves, vf);
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REGISTER_FILTER(DCTDNOIZ, dctdnoiz, vf);
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REGISTER_FILTER(DECIMATE, decimate, vf);
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REGISTER_FILTER(DELOGO, delogo, vf);
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REGISTER_FILTER(DESHAKE, deshake, vf);
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@ -29,7 +29,7 @@
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#include "libavutil/avutil.h"
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#define LIBAVFILTER_VERSION_MAJOR 3
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#define LIBAVFILTER_VERSION_MINOR 66
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#define LIBAVFILTER_VERSION_MINOR 67
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#define LIBAVFILTER_VERSION_MICRO 100
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#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
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431
libavfilter/vf_dctdnoiz.c
Normal file
431
libavfilter/vf_dctdnoiz.c
Normal file
@ -0,0 +1,431 @@
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/*
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* Copyright (c) 2013 Clément Bœsch
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* A simple, relatively efficient and extremely slow DCT image denoiser.
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* @see http://www.ipol.im/pub/art/2011/ys-dct/
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*/
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#include "libavcodec/avfft.h"
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#include "libavutil/eval.h"
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#include "libavutil/opt.h"
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#include "drawutils.h"
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#include "internal.h"
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#define NBITS 4
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#define BSIZE (1<<(NBITS))
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static const char *const var_names[] = { "c", NULL };
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enum { VAR_C, VAR_VARS_NB };
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typedef struct {
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const AVClass *class;
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/* coefficient factor expression */
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char *expr_str;
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AVExpr *expr;
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double var_values[VAR_VARS_NB];
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int pr_width, pr_height; // width and height to process
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float sigma; // used when no expression are st
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float th; // threshold (3*sigma)
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float color_dct[3][3]; // 3x3 DCT for color decorrelation
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float *cbuf[2][3]; // two planar rgb color buffers
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float *weights; // dct coeff are cumulated with overlapping; these values are used for averaging
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int p_linesize; // line sizes for color and weights
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int overlap; // number of block overlapping pixels
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int step; // block step increment (BSIZE - overlap)
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DCTContext *dct, *idct; // DCT and inverse DCT contexts
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float *block, *tmp_block; // two BSIZE x BSIZE block buffers
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} DCTdnoizContext;
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#define OFFSET(x) offsetof(DCTdnoizContext, x)
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
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static const AVOption dctdnoiz_options[] = {
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{ "sigma", "set noise sigma constant", OFFSET(sigma), AV_OPT_TYPE_FLOAT, {.dbl=0}, 0, 999, .flags = FLAGS },
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{ "s", "set noise sigma constant", OFFSET(sigma), AV_OPT_TYPE_FLOAT, {.dbl=0}, 0, 999, .flags = FLAGS },
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{ "overlap", "set number of block overlapping pixels", OFFSET(overlap), AV_OPT_TYPE_INT, {.i64=(1<<NBITS)-1}, 0, (1<<NBITS)-1, .flags = FLAGS },
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{ "expr", "set coefficient factor expression", OFFSET(expr_str), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
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{ "e", "set coefficient factor expression", OFFSET(expr_str), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(dctdnoiz);
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static float *dct_block(DCTdnoizContext *ctx, const float *src, int src_linesize)
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{
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int x, y;
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float *column;
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for (y = 0; y < BSIZE; y++) {
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float *line = ctx->block;
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memcpy(line, src, BSIZE * sizeof(*line));
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src += src_linesize;
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av_dct_calc(ctx->dct, line);
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column = ctx->tmp_block + y;
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for (x = 0; x < BSIZE; x++) {
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*line *= x == 0 ? 1. / sqrt(BSIZE) : sqrt(2. / BSIZE);
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*column = *line++;
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column += BSIZE;
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}
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}
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column = ctx->tmp_block;
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for (x = 0; x < BSIZE; x++) {
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av_dct_calc(ctx->dct, column);
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for (y = 0; y < BSIZE; y++)
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column[y] *= y == 0 ? 1. / sqrt(BSIZE) : sqrt(2. / BSIZE);
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column += BSIZE;
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}
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for (y = 0; y < BSIZE; y++)
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for (x = 0; x < BSIZE; x++)
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ctx->block[y*BSIZE + x] = ctx->tmp_block[x*BSIZE + y];
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return ctx->block;
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}
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static void idct_block(DCTdnoizContext *ctx, float *dst, int dst_linesize)
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{
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int x, y;
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float *block = ctx->block;
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float *tmp = ctx->tmp_block;
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for (y = 0; y < BSIZE; y++) {
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for (x = 0; x < BSIZE; x++)
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block[x] *= x == 0 ? sqrt(BSIZE) : 1./sqrt(2. / BSIZE);
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av_dct_calc(ctx->idct, block);
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block += BSIZE;
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}
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block = ctx->block;
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for (y = 0; y < BSIZE; y++) {
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for (x = 0; x < BSIZE; x++) {
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tmp[x] = block[x*BSIZE + y];
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tmp[x] *= x == 0 ? sqrt(BSIZE) : 1./sqrt(2. / BSIZE);
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}
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av_dct_calc(ctx->idct, tmp);
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for (x = 0; x < BSIZE; x++)
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dst[x*dst_linesize + y] += tmp[x];
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}
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}
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static int config_input(AVFilterLink *inlink)
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{
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AVFilterContext *ctx = inlink->dst;
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DCTdnoizContext *s = ctx->priv;
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int i, x, y, bx, by, linesize, *iweights;
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const float dct_3x3[3][3] = {
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{ 1./sqrt(3), 1./sqrt(3), 1./sqrt(3) },
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{ 1./sqrt(2), 0, -1./sqrt(2) },
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{ 1./sqrt(6), -2./sqrt(6), 1./sqrt(6) },
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};
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uint8_t rgba_map[4];
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ff_fill_rgba_map(rgba_map, inlink->format);
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for (y = 0; y < 3; y++)
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for (x = 0; x < 3; x++)
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s->color_dct[y][x] = dct_3x3[rgba_map[y]][rgba_map[x]];
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s->pr_width = inlink->w - (inlink->w - BSIZE) % s->step;
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s->pr_height = inlink->w - (inlink->h - BSIZE) % s->step;
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if (s->pr_width != inlink->w)
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av_log(ctx, AV_LOG_WARNING, "The last %d horizontal pixels won't be denoised\n",
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inlink->w - s->pr_width);
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if (s->pr_height != inlink->h)
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av_log(ctx, AV_LOG_WARNING, "The last %d vertical pixels won't be denoised\n",
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inlink->h - s->pr_height);
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s->p_linesize = linesize = FFALIGN(s->pr_width, 32);
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for (i = 0; i < 2; i++) {
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s->cbuf[i][0] = av_malloc(linesize * s->pr_height * sizeof(*s->cbuf[i][0]));
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s->cbuf[i][1] = av_malloc(linesize * s->pr_height * sizeof(*s->cbuf[i][1]));
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s->cbuf[i][2] = av_malloc(linesize * s->pr_height * sizeof(*s->cbuf[i][2]));
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if (!s->cbuf[i][0] || !s->cbuf[i][1] || !s->cbuf[i][2])
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return AVERROR(ENOMEM);
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}
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s->weights = av_malloc(s->pr_height * linesize * sizeof(*s->weights));
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if (!s->weights)
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return AVERROR(ENOMEM);
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iweights = av_calloc(s->pr_height, linesize * sizeof(*iweights));
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if (!iweights)
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return AVERROR(ENOMEM);
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for (y = 0; y < s->pr_height - BSIZE + 1; y += s->step)
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for (x = 0; x < s->pr_width - BSIZE + 1; x += s->step)
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for (by = 0; by < BSIZE; by++)
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for (bx = 0; bx < BSIZE; bx++)
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iweights[(y + by)*linesize + x + bx]++;
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for (y = 0; y < s->pr_height; y++)
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for (x = 0; x < s->pr_width; x++)
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s->weights[y*linesize + x] = 1. / iweights[y*linesize + x];
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av_free(iweights);
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return 0;
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}
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static av_cold int init(AVFilterContext *ctx)
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{
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DCTdnoizContext *s = ctx->priv;
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if (s->expr_str) {
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int ret = av_expr_parse(&s->expr, s->expr_str, var_names,
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NULL, NULL, NULL, NULL, 0, ctx);
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if (ret < 0)
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return ret;
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}
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s->th = s->sigma * 3.;
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s->step = BSIZE - s->overlap;
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s->dct = av_dct_init(NBITS, DCT_II);
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s->idct = av_dct_init(NBITS, DCT_III);
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s->block = av_malloc(BSIZE * BSIZE * sizeof(*s->block));
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s->tmp_block = av_malloc(BSIZE * BSIZE * sizeof(*s->tmp_block));
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if (!s->dct || !s->idct || !s->tmp_block || !s->block)
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return AVERROR(ENOMEM);
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return 0;
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}
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static int query_formats(AVFilterContext *ctx)
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{
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static const enum AVPixelFormat pix_fmts[] = {
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AV_PIX_FMT_BGR24, AV_PIX_FMT_RGB24,
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AV_PIX_FMT_NONE
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};
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ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
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return 0;
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}
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static void color_decorrelation(float dct3ch[3][3], float **dst, int dst_linesize,
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const uint8_t *src, int src_linesize, int w, int h)
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{
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int x, y;
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float *dstp_r = dst[0];
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float *dstp_g = dst[1];
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float *dstp_b = dst[2];
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for (y = 0; y < h; y++) {
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const uint8_t *srcp = src;
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for (x = 0; x < w; x++) {
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dstp_r[x] = srcp[0] * dct3ch[0][0] + srcp[1] * dct3ch[0][1] + srcp[2] * dct3ch[0][2];
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dstp_g[x] = srcp[0] * dct3ch[1][0] + srcp[1] * dct3ch[1][1] + srcp[2] * dct3ch[1][2];
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dstp_b[x] = srcp[0] * dct3ch[2][0] + srcp[1] * dct3ch[2][1] + srcp[2] * dct3ch[2][2];
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srcp += 3;
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}
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src += src_linesize;
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dstp_r += dst_linesize;
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dstp_g += dst_linesize;
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dstp_b += dst_linesize;
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}
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}
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static void color_correlation(float dct3ch[3][3], uint8_t *dst, int dst_linesize,
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float **src, int src_linesize, int w, int h)
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{
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int x, y;
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const float *src_r = src[0];
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const float *src_g = src[1];
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const float *src_b = src[2];
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for (y = 0; y < h; y++) {
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uint8_t *dstp = dst;
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for (x = 0; x < w; x++) {
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dstp[0] = av_clip_uint8(src_r[x] * dct3ch[0][0] + src_g[x] * dct3ch[1][0] + src_b[x] * dct3ch[2][0]);
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dstp[1] = av_clip_uint8(src_r[x] * dct3ch[0][1] + src_g[x] * dct3ch[1][1] + src_b[x] * dct3ch[2][1]);
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dstp[2] = av_clip_uint8(src_r[x] * dct3ch[0][2] + src_g[x] * dct3ch[1][2] + src_b[x] * dct3ch[2][2]);
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dstp += 3;
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}
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dst += dst_linesize;
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src_r += src_linesize;
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src_g += src_linesize;
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src_b += src_linesize;
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}
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}
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static void filter_plane(AVFilterContext *ctx,
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float *dst, int dst_linesize,
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const float *src, int src_linesize,
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int w, int h)
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{
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int x, y, bx, by;
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DCTdnoizContext *s = ctx->priv;
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float *dst0 = dst;
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const float *weights = s->weights;
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// reset block sums
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memset(dst, 0, h * dst_linesize * sizeof(*dst));
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// block dct sums
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for (y = 0; y < h - BSIZE + 1; y += s->step) {
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for (x = 0; x < w - BSIZE + 1; x += s->step) {
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float *ftb = dct_block(s, src + x, src_linesize);
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if (s->expr) {
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for (by = 0; by < BSIZE; by++) {
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for (bx = 0; bx < BSIZE; bx++) {
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s->var_values[VAR_C] = FFABS(*ftb);
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*ftb++ *= av_expr_eval(s->expr, s->var_values, s);
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}
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}
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} else {
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for (by = 0; by < BSIZE; by++) {
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for (bx = 0; bx < BSIZE; bx++) {
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if (FFABS(*ftb) < s->th)
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*ftb = 0;
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ftb++;
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}
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}
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}
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idct_block(s, dst + x, dst_linesize);
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}
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src += s->step * src_linesize;
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dst += s->step * dst_linesize;
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}
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||||
|
||||
// average blocks
|
||||
dst = dst0;
|
||||
for (y = 0; y < h; y++) {
|
||||
for (x = 0; x < w; x++)
|
||||
dst[x] *= weights[x];
|
||||
dst += dst_linesize;
|
||||
weights += dst_linesize;
|
||||
}
|
||||
}
|
||||
|
||||
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
|
||||
{
|
||||
AVFilterContext *ctx = inlink->dst;
|
||||
DCTdnoizContext *s = ctx->priv;
|
||||
AVFilterLink *outlink = inlink->dst->outputs[0];
|
||||
int direct, plane;
|
||||
AVFrame *out;
|
||||
|
||||
if (av_frame_is_writable(in)) {
|
||||
direct = 1;
|
||||
out = in;
|
||||
} else {
|
||||
direct = 0;
|
||||
out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
|
||||
if (!out) {
|
||||
av_frame_free(&in);
|
||||
return AVERROR(ENOMEM);
|
||||
}
|
||||
av_frame_copy_props(out, in);
|
||||
}
|
||||
|
||||
color_decorrelation(s->color_dct, s->cbuf[0], s->p_linesize,
|
||||
in->data[0], in->linesize[0], s->pr_width, s->pr_height);
|
||||
for (plane = 0; plane < 3; plane++)
|
||||
filter_plane(ctx, s->cbuf[1][plane], s->p_linesize,
|
||||
s->cbuf[0][plane], s->p_linesize,
|
||||
s->pr_width, s->pr_height);
|
||||
color_correlation(s->color_dct, out->data[0], out->linesize[0],
|
||||
s->cbuf[1], s->p_linesize, s->pr_width, s->pr_height);
|
||||
|
||||
if (!direct) {
|
||||
int y;
|
||||
uint8_t *dst = out->data[0];
|
||||
const uint8_t *src = in->data[0];
|
||||
const int dst_linesize = out->linesize[0];
|
||||
const int src_linesize = in->linesize[0];
|
||||
const int hpad = (inlink->w - s->pr_width) * 3;
|
||||
const int vpad = (inlink->h - s->pr_height);
|
||||
|
||||
if (hpad) {
|
||||
uint8_t *dstp = dst + s->pr_width * 3;
|
||||
const uint8_t *srcp = src + s->pr_width * 3;
|
||||
|
||||
for (y = 0; y < s->pr_height; y++) {
|
||||
memcpy(dstp, srcp, hpad);
|
||||
dstp += dst_linesize;
|
||||
srcp += src_linesize;
|
||||
}
|
||||
}
|
||||
if (vpad) {
|
||||
uint8_t *dstp = dst + s->pr_height * dst_linesize;
|
||||
const uint8_t *srcp = src + s->pr_height * src_linesize;
|
||||
|
||||
for (y = 0; y < vpad; y++) {
|
||||
memcpy(dstp, srcp, inlink->w * 3);
|
||||
dstp += dst_linesize;
|
||||
srcp += src_linesize;
|
||||
}
|
||||
}
|
||||
|
||||
av_frame_free(&in);
|
||||
}
|
||||
|
||||
return ff_filter_frame(outlink, out);
|
||||
}
|
||||
|
||||
static av_cold void uninit(AVFilterContext *ctx)
|
||||
{
|
||||
int i;
|
||||
DCTdnoizContext *s = ctx->priv;
|
||||
|
||||
av_dct_end(s->dct);
|
||||
av_dct_end(s->idct);
|
||||
av_free(s->block);
|
||||
av_free(s->tmp_block);
|
||||
av_free(s->weights);
|
||||
for (i = 0; i < 2; i++) {
|
||||
av_free(s->cbuf[i][0]);
|
||||
av_free(s->cbuf[i][1]);
|
||||
av_free(s->cbuf[i][2]);
|
||||
}
|
||||
av_expr_free(s->expr);
|
||||
}
|
||||
|
||||
static const AVFilterPad dctdnoiz_inputs[] = {
|
||||
{
|
||||
.name = "default",
|
||||
.type = AVMEDIA_TYPE_VIDEO,
|
||||
.filter_frame = filter_frame,
|
||||
.config_props = config_input,
|
||||
},
|
||||
{ NULL }
|
||||
};
|
||||
|
||||
static const AVFilterPad dctdnoiz_outputs[] = {
|
||||
{
|
||||
.name = "default",
|
||||
.type = AVMEDIA_TYPE_VIDEO,
|
||||
},
|
||||
{ NULL }
|
||||
};
|
||||
|
||||
AVFilter avfilter_vf_dctdnoiz = {
|
||||
.name = "dctdnoiz",
|
||||
.description = NULL_IF_CONFIG_SMALL("Denoise frames using 2D DCT."),
|
||||
.priv_size = sizeof(DCTdnoizContext),
|
||||
.init = init,
|
||||
.uninit = uninit,
|
||||
.query_formats = query_formats,
|
||||
.inputs = dctdnoiz_inputs,
|
||||
.outputs = dctdnoiz_outputs,
|
||||
.priv_class = &dctdnoiz_class,
|
||||
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
|
||||
};
|
||||
Loading…
Reference in New Issue
Block a user