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552 lines
22 KiB
C
552 lines
22 KiB
C
/*
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* Copyright (c) 2016 Clément Bœsch <u pkh me>
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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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* @todo
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* - SIMD for compute_safe_ssd_integral_image
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* - SIMD for final weighted averaging
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* - better automatic defaults? see "Parameters" @ http://www.ipol.im/pub/art/2011/bcm_nlm/
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* - temporal support (probably doesn't need any displacement according to
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* "Denoising image sequences does not require motion estimation")
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* - Bayer pixel format support for at least raw photos? (DNG support would be
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* handy here)
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* - FATE test (probably needs visual threshold test mechanism due to the use
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* of floats)
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*/
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#include "libavutil/avassert.h"
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#include "libavutil/opt.h"
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#include "libavutil/pixdesc.h"
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#include "avfilter.h"
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#include "formats.h"
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#include "internal.h"
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#include "video.h"
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struct weighted_avg {
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double total_weight;
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double sum;
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};
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#define WEIGHT_LUT_NBITS 9
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#define WEIGHT_LUT_SIZE (1<<WEIGHT_LUT_NBITS)
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typedef struct {
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const AVClass *class;
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int nb_planes;
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int chroma_w, chroma_h;
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double pdiff_scale; // invert of the filtering parameter (sigma*10) squared
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double sigma; // denoising strength
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int patch_size, patch_hsize; // patch size and half size
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int patch_size_uv, patch_hsize_uv; // patch size and half size for chroma planes
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int research_size, research_hsize; // research size and half size
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int research_size_uv, research_hsize_uv; // research size and half size for chroma planes
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uint32_t *ii_orig; // integral image
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uint32_t *ii; // integral image starting after the 0-line and 0-column
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int ii_w, ii_h; // width and height of the integral image
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int ii_lz_32; // linesize in 32-bit units of the integral image
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struct weighted_avg *wa; // weighted average of every pixel
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int wa_linesize; // linesize for wa in struct size unit
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double weight_lut[WEIGHT_LUT_SIZE]; // lookup table mapping (scaled) patch differences to their associated weights
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double pdiff_lut_scale; // scale factor for patch differences before looking into the LUT
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int max_meaningful_diff; // maximum difference considered (if the patch difference is too high we ignore the pixel)
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} NLMeansContext;
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#define OFFSET(x) offsetof(NLMeansContext, x)
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
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static const AVOption nlmeans_options[] = {
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{ "s", "denoising strength", OFFSET(sigma), AV_OPT_TYPE_DOUBLE, { .dbl = 1.0 }, 1.0, 30.0, FLAGS },
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{ "p", "patch size", OFFSET(patch_size), AV_OPT_TYPE_INT, { .i64 = 3*2+1 }, 0, 99, FLAGS },
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{ "pc", "patch size for chroma planes", OFFSET(patch_size_uv), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 99, FLAGS },
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{ "r", "research window", OFFSET(research_size), AV_OPT_TYPE_INT, { .i64 = 7*2+1 }, 0, 99, FLAGS },
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{ "rc", "research window for chroma planes", OFFSET(research_size_uv), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 99, FLAGS },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(nlmeans);
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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_YUV410P, AV_PIX_FMT_YUV411P,
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AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P,
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AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV444P,
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AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P,
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AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
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AV_PIX_FMT_YUVJ411P,
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AV_PIX_FMT_GRAY8, AV_PIX_FMT_GBRP,
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AV_PIX_FMT_NONE
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};
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AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
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if (!fmts_list)
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return AVERROR(ENOMEM);
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return ff_set_common_formats(ctx, fmts_list);
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}
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/*
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* M is a discrete map where every entry contains the sum of all the entries
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* in the rectangle from the top-left origin of M to its coordinate. In the
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* following schema, "i" contains the sum of the whole map:
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*
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* M = +----------+-----------------+----+
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* | | | |
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* | | | |
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* | a| b| c|
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* +----------+-----------------+----+
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* | | | |
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* | | | |
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* | | X | |
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* | | | |
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* | d| e| f|
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* +----------+-----------------+----+
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* | | | |
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* | g| h| i|
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* +----------+-----------------+----+
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*
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* The sum of the X box can be calculated with:
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* X = e-d-b+a
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*
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* See https://en.wikipedia.org/wiki/Summed_area_table
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*
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* The compute*_ssd functions compute the integral image M where every entry
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* contains the sum of the squared difference of every corresponding pixels of
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* two input planes of the same size as M.
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*/
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static inline int get_integral_patch_value(const uint32_t *ii, int ii_lz_32, int x, int y, int p)
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{
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const int e = ii[(y + p ) * ii_lz_32 + (x + p )];
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const int d = ii[(y + p ) * ii_lz_32 + (x - p - 1)];
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const int b = ii[(y - p - 1) * ii_lz_32 + (x + p )];
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const int a = ii[(y - p - 1) * ii_lz_32 + (x - p - 1)];
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return e - d - b + a;
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}
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/**
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* Compute squared difference of the safe area (the zone where s1 and s2
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* overlap). It is likely the largest integral zone, so it is interesting to do
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* as little checks as possible; contrary to the unsafe version of this
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* function, we do not need any clipping here.
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*
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* The line above dst and the column to its left are always readable.
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*
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* This C version computes the SSD integral image using a scalar accumulator,
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* while for SIMD implementation it is likely more interesting to use the
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* two-loops algorithm variant.
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*/
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static void compute_safe_ssd_integral_image_c(uint32_t *dst, int dst_linesize_32,
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const uint8_t *s1, int linesize1,
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const uint8_t *s2, int linesize2,
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int w, int h)
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{
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int x, y;
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for (y = 0; y < h; y++) {
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uint32_t acc = dst[-1] - dst[-dst_linesize_32 - 1];
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for (x = 0; x < w; x++) {
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const int d = s1[x] - s2[x];
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acc += d * d;
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dst[x] = dst[-dst_linesize_32 + x] + acc;
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}
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s1 += linesize1;
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s2 += linesize2;
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dst += dst_linesize_32;
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}
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}
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/**
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* Compute squared difference of an unsafe area (the zone nor s1 nor s2 could
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* be readable).
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*
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* On the other hand, the line above dst and the column to its left are always
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* readable.
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*
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* There is little point in having this function SIMDified as it is likely too
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* complex and only handle small portions of the image.
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*
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* @param dst integral image
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* @param dst_linesize_32 integral image linesize (in 32-bit integers unit)
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* @param startx integral starting x position
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* @param starty integral starting y position
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* @param src source plane buffer
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* @param linesize source plane linesize
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* @param offx source offsetting in x
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* @param offy source offsetting in y
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* @paran r absolute maximum source offsetting
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* @param sw source width
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* @param sh source height
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* @param w width to compute
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* @param h height to compute
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*/
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static inline void compute_unsafe_ssd_integral_image(uint32_t *dst, int dst_linesize_32,
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int startx, int starty,
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const uint8_t *src, int linesize,
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int offx, int offy, int r, int sw, int sh,
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int w, int h)
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{
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int x, y;
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for (y = starty; y < starty + h; y++) {
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uint32_t acc = dst[y*dst_linesize_32 + startx - 1] - dst[(y-1)*dst_linesize_32 + startx - 1];
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const int s1y = av_clip(y - r, 0, sh - 1);
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const int s2y = av_clip(y - (r + offy), 0, sh - 1);
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for (x = startx; x < startx + w; x++) {
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const int s1x = av_clip(x - r, 0, sw - 1);
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const int s2x = av_clip(x - (r + offx), 0, sw - 1);
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const uint8_t v1 = src[s1y*linesize + s1x];
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const uint8_t v2 = src[s2y*linesize + s2x];
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const int d = v1 - v2;
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acc += d * d;
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dst[y*dst_linesize_32 + x] = dst[(y-1)*dst_linesize_32 + x] + acc;
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}
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}
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}
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/*
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* Compute the sum of squared difference integral image
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* http://www.ipol.im/pub/art/2014/57/
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* Integral Images for Block Matching - Gabriele Facciolo, Nicolas Limare, Enric Meinhardt-Llopis
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*
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* @param ii integral image of dimension (w+e*2) x (h+e*2) with
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* an additional zeroed top line and column already
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* "applied" to the pointer value
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* @param ii_linesize_32 integral image linesize (in 32-bit integers unit)
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* @param src source plane buffer
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* @param linesize source plane linesize
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* @param offx x-offsetting ranging in [-e;e]
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* @param offy y-offsetting ranging in [-e;e]
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* @param w source width
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* @param h source height
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* @param e research padding edge
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*/
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static void compute_ssd_integral_image(uint32_t *ii, int ii_linesize_32,
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const uint8_t *src, int linesize, int offx, int offy,
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int e, int w, int h)
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{
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// ii has a surrounding padding of thickness "e"
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const int ii_w = w + e*2;
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const int ii_h = h + e*2;
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// we center the first source
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const int s1x = e;
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const int s1y = e;
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// 2nd source is the frame with offsetting
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const int s2x = e + offx;
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const int s2y = e + offy;
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// get the dimension of the overlapping rectangle where it is always safe
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// to compare the 2 sources pixels
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const int startx_safe = FFMAX(s1x, s2x);
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const int starty_safe = FFMAX(s1y, s2y);
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const int endx_safe = FFMIN(s1x + w, s2x + w);
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const int endy_safe = FFMIN(s1y + h, s2y + h);
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// top part where only one of s1 and s2 is still readable, or none at all
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compute_unsafe_ssd_integral_image(ii, ii_linesize_32,
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0, 0,
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src, linesize,
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offx, offy, e, w, h,
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ii_w, starty_safe);
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// fill the left column integral required to compute the central
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// overlapping one
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compute_unsafe_ssd_integral_image(ii, ii_linesize_32,
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0, starty_safe,
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src, linesize,
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offx, offy, e, w, h,
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startx_safe, endy_safe - starty_safe);
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// main and safe part of the integral
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av_assert1(startx_safe - s1x >= 0); av_assert1(startx_safe - s1x < w);
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av_assert1(starty_safe - s1y >= 0); av_assert1(starty_safe - s1y < h);
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av_assert1(startx_safe - s2x >= 0); av_assert1(startx_safe - s2x < w);
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av_assert1(starty_safe - s2y >= 0); av_assert1(starty_safe - s2y < h);
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compute_safe_ssd_integral_image_c(ii + starty_safe*ii_linesize_32 + startx_safe, ii_linesize_32,
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src + (starty_safe - s1y) * linesize + (startx_safe - s1x), linesize,
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src + (starty_safe - s2y) * linesize + (startx_safe - s2x), linesize,
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endx_safe - startx_safe, endy_safe - starty_safe);
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// right part of the integral
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compute_unsafe_ssd_integral_image(ii, ii_linesize_32,
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endx_safe, starty_safe,
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src, linesize,
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offx, offy, e, w, h,
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ii_w - endx_safe, endy_safe - starty_safe);
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// bottom part where only one of s1 and s2 is still readable, or none at all
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compute_unsafe_ssd_integral_image(ii, ii_linesize_32,
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0, endy_safe,
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src, linesize,
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offx, offy, e, w, h,
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ii_w, ii_h - endy_safe);
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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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NLMeansContext *s = ctx->priv;
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
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const int e = FFMAX(s->research_hsize, s->research_hsize_uv)
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+ FFMAX(s->patch_hsize, s->patch_hsize_uv);
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s->chroma_w = FF_CEIL_RSHIFT(inlink->w, desc->log2_chroma_w);
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s->chroma_h = FF_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
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s->nb_planes = av_pix_fmt_count_planes(inlink->format);
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/* Allocate the integral image with extra edges of thickness "e"
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*
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* +_+-------------------------------+
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* |0|0000000000000000000000000000000|
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* +-x-------------------------------+
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* |0|\ ^ |
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* |0| ii | e |
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* |0| v |
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* |0| +-----------------------+ |
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* |0| | | |
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* |0|<->| | |
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* |0| e | | |
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* |0| | | |
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* |0| +-----------------------+ |
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* |0| |
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* |0| |
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* |0| |
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* +-+-------------------------------+
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*/
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s->ii_w = inlink->w + e*2;
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s->ii_h = inlink->h + e*2;
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// align to 4 the linesize, "+1" is for the space of the left 0-column
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s->ii_lz_32 = FFALIGN(s->ii_w + 1, 4);
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// "+1" is for the space of the top 0-line
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s->ii_orig = av_mallocz_array(s->ii_h + 1, s->ii_lz_32 * sizeof(*s->ii_orig));
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if (!s->ii_orig)
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return AVERROR(ENOMEM);
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// skip top 0-line and left 0-column
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s->ii = s->ii_orig + s->ii_lz_32 + 1;
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// allocate weighted average for every pixel
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s->wa_linesize = inlink->w;
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s->wa = av_malloc_array(s->wa_linesize, inlink->h * sizeof(*s->wa));
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if (!s->wa)
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return AVERROR(ENOMEM);
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return 0;
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}
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struct thread_data {
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const uint8_t *src;
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int src_linesize;
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int startx, starty;
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int endx, endy;
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const uint32_t *ii_start;
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int p;
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};
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static int nlmeans_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
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{
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int x, y;
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NLMeansContext *s = ctx->priv;
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const struct thread_data *td = arg;
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const uint8_t *src = td->src;
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const int src_linesize = td->src_linesize;
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const int process_h = td->endy - td->starty;
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const int slice_start = (process_h * jobnr ) / nb_jobs;
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const int slice_end = (process_h * (jobnr+1)) / nb_jobs;
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const int starty = td->starty + slice_start;
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const int endy = td->starty + slice_end;
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for (y = starty; y < endy; y++) {
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for (x = td->startx; x < td->endx; x++) {
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const int patch_diff_sq = get_integral_patch_value(td->ii_start, s->ii_lz_32, x, y, td->p);
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if (patch_diff_sq < s->max_meaningful_diff) {
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struct weighted_avg *wa = &s->wa[y*s->wa_linesize + x];
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const int weight_lut_idx = patch_diff_sq * s->pdiff_lut_scale;
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const double weight = s->weight_lut[weight_lut_idx]; // exp(-patch_diff_sq * s->pdiff_scale)
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wa->total_weight += weight;
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wa->sum += weight * src[y*src_linesize + x];
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}
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}
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}
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return 0;
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}
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static int nlmeans_plane(AVFilterContext *ctx, int w, int h, int p, int r,
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uint8_t *dst, int dst_linesize,
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const uint8_t *src, int src_linesize)
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{
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int x, y;
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int offx, offy;
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NLMeansContext *s = ctx->priv;
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/* patches center points cover the whole research window so the patches
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* themselves overflow the research window */
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const int e = r + p;
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/* focus an integral pointer on the centered image (s1) */
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const uint32_t *centered_ii = s->ii + e*s->ii_lz_32 + e;
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memset(s->wa, 0, s->wa_linesize * h * sizeof(*s->wa));
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for (offy = -r; offy <= r; offy++) {
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for (offx = -r; offx <= r; offx++) {
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if (offx || offy) {
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struct thread_data td = {
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.src = src + offy*src_linesize + offx,
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.src_linesize = src_linesize,
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.startx = FFMAX(0, -offx),
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.starty = FFMAX(0, -offy),
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.endx = FFMIN(w, w - offx),
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.endy = FFMIN(h, h - offy),
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.ii_start = centered_ii + offy*s->ii_lz_32 + offx,
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.p = p,
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};
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compute_ssd_integral_image(s->ii, s->ii_lz_32,
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src, src_linesize,
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offx, offy, e, w, h);
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ctx->internal->execute(ctx, nlmeans_slice, &td, NULL,
|
|
FFMIN(td.endy - td.starty, ff_filter_get_nb_threads(ctx)));
|
|
}
|
|
}
|
|
}
|
|
for (y = 0; y < h; y++) {
|
|
for (x = 0; x < w; x++) {
|
|
struct weighted_avg *wa = &s->wa[y*s->wa_linesize + x];
|
|
|
|
// Also weight the centered pixel
|
|
wa->total_weight += 1.0;
|
|
wa->sum += 1.0 * src[y*src_linesize + x];
|
|
|
|
dst[y*dst_linesize + x] = av_clip_uint8(wa->sum / wa->total_weight);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
|
|
{
|
|
int i;
|
|
AVFilterContext *ctx = inlink->dst;
|
|
NLMeansContext *s = ctx->priv;
|
|
AVFilterLink *outlink = ctx->outputs[0];
|
|
|
|
AVFrame *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);
|
|
|
|
for (i = 0; i < s->nb_planes; i++) {
|
|
const int w = i ? s->chroma_w : inlink->w;
|
|
const int h = i ? s->chroma_h : inlink->h;
|
|
const int p = i ? s->patch_hsize_uv : s->patch_hsize;
|
|
const int r = i ? s->research_hsize_uv : s->research_hsize;
|
|
nlmeans_plane(ctx, w, h, p, r,
|
|
out->data[i], out->linesize[i],
|
|
in->data[i], in->linesize[i]);
|
|
}
|
|
|
|
av_frame_free(&in);
|
|
return ff_filter_frame(outlink, out);
|
|
}
|
|
|
|
#define CHECK_ODD_FIELD(field, name) do { \
|
|
if (!(s->field & 1)) { \
|
|
s->field |= 1; \
|
|
av_log(ctx, AV_LOG_WARNING, name " size must be odd, " \
|
|
"setting it to %d\n", s->field); \
|
|
} \
|
|
} while (0)
|
|
|
|
static av_cold int init(AVFilterContext *ctx)
|
|
{
|
|
int i;
|
|
NLMeansContext *s = ctx->priv;
|
|
const double h = s->sigma * 10.;
|
|
|
|
s->pdiff_scale = 1. / (h * h);
|
|
s->max_meaningful_diff = -log(1/255.) / s->pdiff_scale;
|
|
s->pdiff_lut_scale = 1./s->max_meaningful_diff * WEIGHT_LUT_SIZE;
|
|
av_assert0((s->max_meaningful_diff - 1) * s->pdiff_lut_scale < FF_ARRAY_ELEMS(s->weight_lut));
|
|
for (i = 0; i < WEIGHT_LUT_SIZE; i++)
|
|
s->weight_lut[i] = exp(-i / s->pdiff_lut_scale * s->pdiff_scale);
|
|
|
|
CHECK_ODD_FIELD(research_size, "Luma research window");
|
|
CHECK_ODD_FIELD(patch_size, "Luma patch");
|
|
|
|
if (!s->research_size_uv) s->research_size_uv = s->research_size;
|
|
if (!s->patch_size_uv) s->patch_size_uv = s->patch_size;
|
|
|
|
CHECK_ODD_FIELD(research_size_uv, "Chroma research window");
|
|
CHECK_ODD_FIELD(patch_size_uv, "Chroma patch");
|
|
|
|
s->research_hsize = s->research_size / 2;
|
|
s->research_hsize_uv = s->research_size_uv / 2;
|
|
s->patch_hsize = s->patch_size / 2;
|
|
s->patch_hsize_uv = s->patch_size_uv / 2;
|
|
|
|
av_log(ctx, AV_LOG_INFO, "Research window: %dx%d / %dx%d, patch size: %dx%d / %dx%d\n",
|
|
s->research_size, s->research_size, s->research_size_uv, s->research_size_uv,
|
|
s->patch_size, s->patch_size, s->patch_size_uv, s->patch_size_uv);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static av_cold void uninit(AVFilterContext *ctx)
|
|
{
|
|
NLMeansContext *s = ctx->priv;
|
|
av_freep(&s->ii_orig);
|
|
av_freep(&s->wa);
|
|
}
|
|
|
|
static const AVFilterPad nlmeans_inputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.config_props = config_input,
|
|
.filter_frame = filter_frame,
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
static const AVFilterPad nlmeans_outputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
AVFilter ff_vf_nlmeans = {
|
|
.name = "nlmeans",
|
|
.description = NULL_IF_CONFIG_SMALL("Non-local means denoiser."),
|
|
.priv_size = sizeof(NLMeansContext),
|
|
.init = init,
|
|
.uninit = uninit,
|
|
.query_formats = query_formats,
|
|
.inputs = nlmeans_inputs,
|
|
.outputs = nlmeans_outputs,
|
|
.priv_class = &nlmeans_class,
|
|
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
|
|
};
|