mirror of https://github.com/FFmpeg/FFmpeg.git
Thilo Borgmann
3 years ago
parent
22df52c444
commit
b23208826b
8 changed files with 463 additions and 1 deletions
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/*
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* Copyright (c) 2021 Thilo Borgmann <thilo.borgmann _at_ mail.de> |
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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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* @file |
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* No-reference blurdetect filter |
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* |
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* Implementing: |
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* Marziliano, Pina, et al. "A no-reference perceptual blur metric." Proceedings. |
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* International conference on image processing. Vol. 3. IEEE, 2002. |
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* https://infoscience.epfl.ch/record/111802/files/14%20A%20no-reference%20perceptual%20blur%20metric.pdf
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* |
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* @author Thilo Borgmann <thilo.borgmann _at_ mail.de> |
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*/ |
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#include "libavutil/avassert.h" |
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#include "libavutil/imgutils.h" |
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#include "libavutil/opt.h" |
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#include "libavutil/pixelutils.h" |
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#include "libavutil/motion_vector.h" |
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#include "libavutil/qsort.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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#include "edge_common.h" |
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static int comp(const float *a,const float *b) |
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{ |
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return FFDIFFSIGN(*a, *b); |
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} |
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typedef struct BLRContext { |
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const AVClass *class; |
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int hsub, vsub; |
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int nb_planes; |
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float low, high; |
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uint8_t low_u8, high_u8; |
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int radius; // radius during local maxima detection
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int block_pct; // percentage of "sharpest" blocks in the image to use for bluriness calculation
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int block_width; // width for block abbreviation
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int block_height; // height for block abbreviation
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int planes; // number of planes to filter
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double blur_total; |
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uint64_t nb_frames; |
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float *blks; |
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uint8_t *filterbuf; |
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uint8_t *tmpbuf; |
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uint16_t *gradients; |
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char *directions; |
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} BLRContext; |
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#define OFFSET(x) offsetof(BLRContext, x) |
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM |
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static const AVOption blurdetect_options[] = { |
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{ "high", "set high threshold", OFFSET(high), AV_OPT_TYPE_FLOAT, {.dbl=30/255.}, 0, 1, FLAGS }, |
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{ "low", "set low threshold", OFFSET(low), AV_OPT_TYPE_FLOAT, {.dbl=15/255.}, 0, 1, FLAGS }, |
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{ "radius", "search radius for maxima detection", OFFSET(radius), AV_OPT_TYPE_INT, {.i64=50}, 1, 100, FLAGS }, |
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{ "block_pct", "block pooling threshold when calculating blurriness", OFFSET(block_pct), AV_OPT_TYPE_INT, {.i64=80}, 1, 100, FLAGS }, |
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{ "block_width", "block size for block-based abbreviation of blurriness", OFFSET(block_width), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, FLAGS }, |
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{ "block_height", "block size for block-based abbreviation of blurriness", OFFSET(block_height), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, FLAGS }, |
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{ "planes", "set planes to filter", OFFSET(planes), AV_OPT_TYPE_INT, {.i64=1}, 0, 15, FLAGS }, |
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{ NULL } |
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}; |
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AVFILTER_DEFINE_CLASS(blurdetect); |
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static av_cold int blurdetect_init(AVFilterContext *ctx) |
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{ |
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BLRContext *s = ctx->priv; |
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s->low_u8 = s->low * 255. + .5; |
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s->high_u8 = s->high * 255. + .5; |
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return 0; |
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} |
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static int blurdetect_config_input(AVFilterLink *inlink) |
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{ |
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AVFilterContext *ctx = inlink->dst; |
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BLRContext *s = ctx->priv; |
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const int bufsize = inlink->w * inlink->h; |
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const AVPixFmtDescriptor *pix_desc; |
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pix_desc = av_pix_fmt_desc_get(inlink->format); |
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s->hsub = pix_desc->log2_chroma_w; |
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s->vsub = pix_desc->log2_chroma_h; |
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s->nb_planes = av_pix_fmt_count_planes(inlink->format); |
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if (s->block_width < 1 || s->block_height < 1) { |
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s->block_width = inlink->w; |
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s->block_height = inlink->h; |
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} |
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s->tmpbuf = av_malloc(bufsize); |
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s->filterbuf = av_malloc(bufsize); |
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s->gradients = av_calloc(bufsize, sizeof(*s->gradients)); |
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s->directions = av_malloc(bufsize); |
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s->blks = av_calloc((inlink->w / s->block_width) * (inlink->h / s->block_height), |
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sizeof(*s->blks)); |
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if (!s->tmpbuf || !s->filterbuf || !s->gradients || !s->directions || !s->blks) |
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return AVERROR(ENOMEM); |
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return 0; |
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} |
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// edge width is defined as the distance between surrounding maxima of the edge pixel
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static float edge_width(BLRContext *blr, int i, int j, int8_t dir, int w, int h, |
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int edge, const uint8_t *src, int src_linesize) |
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{ |
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float width = 0; |
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int dX, dY; |
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int sign; |
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int tmp; |
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int p1; |
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int p2; |
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int k, x, y; |
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int edge1; |
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int edge2; |
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float luma1 = 0.0; // average luma difference per edge pixel
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float luma2 = 0.0; |
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int radius = blr->radius; |
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switch(dir) { |
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case DIRECTION_HORIZONTAL: dX = 1; dY = 0; break; |
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case DIRECTION_VERTICAL: dX = 0; dY = 1; break; |
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case DIRECTION_45UP: dX = 1; dY = -1; break; |
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case DIRECTION_45DOWN: dX = 1; dY = 1; break; |
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} |
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// determines if search in direction dX/dY is looking for a maximum or minimum
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sign = src[j * src_linesize + i] > src[(j - dY) * src_linesize + i - dX] ? 1 : -1; |
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// search in -(dX/dY) direction
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for (k = 0; k < radius; k++) { |
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x = i - k*dX; |
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y = j - k*dY; |
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p1 = y * src_linesize + x; |
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x -= dX; |
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y -= dY; |
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p2 = y * src_linesize + x; |
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if (x < 0 || x >= w || y < 0 || y >= h) |
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return 0; |
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tmp = (src[p1] - src[p2]) * sign; |
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if (tmp <= 0) // local maximum found
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break; |
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luma1 += tmp; |
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} |
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if (k > 0) luma1 /= k; |
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edge1 = k; |
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width += k; |
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// search in +(dX/dY) direction
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for (k = 0; k < radius; k++) { |
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x = i + k * dX; |
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y = j + k * dY; |
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p1 = y * src_linesize + x; |
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x += dX; |
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y += dY; |
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p2 = y * src_linesize + x; |
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if (x < 0 || x >= w || y < 0 || y >= h) |
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return 0; |
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tmp = (src[p1] - src[p2]) * sign; |
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if (tmp >= 0) // local maximum found
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break; |
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luma2 -= tmp; |
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} |
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if (k > 0) luma2 /= k; |
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edge2 = k; |
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width += k; |
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// for 45 degree directions approximate edge width in pixel units: 0.7 ~= sqrt(2)/2
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if (dir == DIRECTION_45UP || dir == DIRECTION_45DOWN) |
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width *= 0.7; |
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return width; |
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} |
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static float calculate_blur(BLRContext *s, int w, int h, int hsub, int vsub, |
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uint8_t* dir, int dir_linesize, |
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uint8_t* dst, int dst_linesize, |
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uint8_t* src, int src_linesize) |
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{ |
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float total_width = 0.0; |
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int block_count; |
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double block_total_width; |
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int i, j; |
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int blkcnt = 0; |
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float *blks = s->blks; |
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float block_pool_threshold = s->block_pct / 100.0; |
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int block_width = AV_CEIL_RSHIFT(s->block_width, hsub); |
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int block_height = AV_CEIL_RSHIFT(s->block_height, vsub); |
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int brows = h / block_height; |
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int bcols = w / block_width; |
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for (int blkj = 0; blkj < brows; blkj++) { |
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for (int blki = 0; blki < bcols; blki++) { |
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block_total_width = 0.0; |
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block_count = 0; |
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for (int inj = 0; inj < block_height; inj++) { |
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for (int ini = 0; ini < block_width; ini++) { |
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i = blki * block_width + ini; |
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j = blkj * block_height + inj; |
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if (dst[j * dst_linesize + i] > 0) { |
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float width = edge_width(s, i, j, dir[j*dir_linesize+i], |
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w, h, dst[j*dst_linesize+i], |
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src, src_linesize); |
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if (width > 0.001) { // throw away zeros
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block_count++; |
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block_total_width += width; |
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} |
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} |
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} |
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} |
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// if not enough edge pixels in a block, consider it smooth
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if (block_total_width >= 2) { |
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blks[blkcnt] = block_total_width / block_count; |
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blkcnt++; |
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} |
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} |
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} |
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// simple block pooling by sorting and keeping the sharper blocks
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AV_QSORT(blks, blkcnt, float, comp); |
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blkcnt = ceil(blkcnt * block_pool_threshold); |
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for (int i = 0; i < blkcnt; i++) { |
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total_width += blks[i]; |
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} |
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return total_width / blkcnt; |
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} |
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static void set_meta(AVDictionary **metadata, const char *key, float d) |
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{ |
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char value[128]; |
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snprintf(value, sizeof(value), "%f", d); |
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av_dict_set(metadata, key, value, 0); |
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} |
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static int blurdetect_filter_frame(AVFilterLink *inlink, AVFrame *in) |
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{ |
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AVFilterContext *ctx = inlink->dst; |
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BLRContext *s = ctx->priv; |
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AVFilterLink *outlink = ctx->outputs[0]; |
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const int inw = inlink->w; |
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const int inh = inlink->h; |
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uint8_t *tmpbuf = s->tmpbuf; |
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uint8_t *filterbuf = s->filterbuf; |
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uint16_t *gradients = s->gradients; |
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int8_t *directions = s->directions; |
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float blur = 0.0f; |
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int nplanes = 0; |
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AVDictionary **metadata; |
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metadata = &in->metadata; |
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for (int plane = 0; plane < s->nb_planes; plane++) { |
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int hsub = plane == 1 || plane == 2 ? s->hsub : 0; |
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int vsub = plane == 1 || plane == 2 ? s->vsub : 0; |
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int w = AV_CEIL_RSHIFT(inw, hsub); |
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int h = AV_CEIL_RSHIFT(inh, vsub); |
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if (!((1 << plane) & s->planes)) |
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continue; |
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nplanes++; |
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// gaussian filter to reduce noise
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ff_gaussian_blur(w, h, |
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filterbuf, w, |
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in->data[plane], in->linesize[plane]); |
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// compute the 16-bits gradients and directions for the next step
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ff_sobel(w, h, gradients, w, directions, w, filterbuf, w); |
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// non_maximum_suppression() will actually keep & clip what's necessary and
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// ignore the rest, so we need a clean output buffer
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memset(tmpbuf, 0, inw * inh); |
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ff_non_maximum_suppression(w, h, tmpbuf, w, directions, w, gradients, w); |
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// keep high values, or low values surrounded by high values
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ff_double_threshold(s->low_u8, s->high_u8, w, h, |
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tmpbuf, w, tmpbuf, w); |
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blur += calculate_blur(s, w, h, hsub, vsub, directions, w, |
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tmpbuf, w, filterbuf, w); |
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} |
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if (nplanes) |
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blur /= nplanes; |
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s->blur_total += blur; |
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// write stats
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av_log(ctx, AV_LOG_VERBOSE, "blur: %.7f\n", blur); |
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set_meta(metadata, "lavfi.blur", blur); |
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s->nb_frames = inlink->frame_count_in; |
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return ff_filter_frame(outlink, in); |
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} |
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static av_cold void blurdetect_uninit(AVFilterContext *ctx) |
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{ |
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BLRContext *s = ctx->priv; |
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if (s->nb_frames > 0) { |
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av_log(ctx, AV_LOG_INFO, "blur mean: %.7f\n", |
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s->blur_total / s->nb_frames); |
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} |
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av_freep(&s->tmpbuf); |
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av_freep(&s->filterbuf); |
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av_freep(&s->gradients); |
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av_freep(&s->directions); |
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av_freep(&s->blks); |
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} |
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static const enum AVPixelFormat pix_fmts[] = { |
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AV_PIX_FMT_GRAY8, |
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AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP, |
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AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P, |
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AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV440P, |
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AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P, |
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AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_YUVJ411P, AV_PIX_FMT_YUVJ420P, |
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AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, |
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AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA420P, |
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AV_PIX_FMT_NONE |
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}; |
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static const AVFilterPad blurdetect_inputs[] = { |
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{ |
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.name = "default", |
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.type = AVMEDIA_TYPE_VIDEO, |
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.config_props = blurdetect_config_input, |
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.filter_frame = blurdetect_filter_frame, |
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}, |
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}; |
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static const AVFilterPad blurdetect_outputs[] = { |
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{ |
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.name = "default", |
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.type = AVMEDIA_TYPE_VIDEO, |
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}, |
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}; |
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const AVFilter ff_vf_blurdetect = { |
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.name = "blurdetect", |
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.description = NULL_IF_CONFIG_SMALL("Blurdetect filter."), |
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.priv_size = sizeof(BLRContext), |
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.init = blurdetect_init, |
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.uninit = blurdetect_uninit, |
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FILTER_PIXFMTS_ARRAY(pix_fmts), |
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FILTER_INPUTS(blurdetect_inputs), |
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FILTER_OUTPUTS(blurdetect_outputs), |
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.priv_class = &blurdetect_class, |
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.flags = AVFILTER_FLAG_METADATA_ONLY, |
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}; |
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@ -0,0 +1,10 @@ |
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frame:0 pts:0 pts_time:0 |
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lavfi.blur=4.499666 |
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frame:1 pts:1 pts_time:1 |
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lavfi.blur=4.677492 |
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frame:2 pts:2 pts_time:2 |
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lavfi.blur=4.735711 |
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frame:3 pts:3 pts_time:3 |
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lavfi.blur=4.532343 |
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frame:4 pts:4 pts_time:4 |
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lavfi.blur=4.532660 |
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