mirror of https://git.ffmpeg.org/ffmpeg.git
lafi/vf_edgedetect: Move some common functions into seperate file
This commit is contained in:
parent
f2724d2b69
commit
22df52c444
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@ -266,7 +266,7 @@ OBJS-$(CONFIG_DRAWBOX_FILTER) += vf_drawbox.o
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OBJS-$(CONFIG_DRAWGRAPH_FILTER) += f_drawgraph.o
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OBJS-$(CONFIG_DRAWGRAPH_FILTER) += f_drawgraph.o
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OBJS-$(CONFIG_DRAWGRID_FILTER) += vf_drawbox.o
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OBJS-$(CONFIG_DRAWGRID_FILTER) += vf_drawbox.o
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OBJS-$(CONFIG_DRAWTEXT_FILTER) += vf_drawtext.o
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OBJS-$(CONFIG_DRAWTEXT_FILTER) += vf_drawtext.o
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OBJS-$(CONFIG_EDGEDETECT_FILTER) += vf_edgedetect.o
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OBJS-$(CONFIG_EDGEDETECT_FILTER) += vf_edgedetect.o edge_common.o
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OBJS-$(CONFIG_ELBG_FILTER) += vf_elbg.o
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OBJS-$(CONFIG_ELBG_FILTER) += vf_elbg.o
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OBJS-$(CONFIG_ENTROPY_FILTER) += vf_entropy.o
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OBJS-$(CONFIG_ENTROPY_FILTER) += vf_entropy.o
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OBJS-$(CONFIG_EPX_FILTER) += vf_epx.o
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OBJS-$(CONFIG_EPX_FILTER) += vf_epx.o
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@ -0,0 +1,181 @@
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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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#include "edge_common.h"
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// Internal helper for ff_sobel()
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static int get_rounded_direction(int gx, int gy)
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{
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/* reference angles:
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* tan( pi/8) = sqrt(2)-1
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* tan(3pi/8) = sqrt(2)+1
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* Gy/Gx is the tangent of the angle (theta), so Gy/Gx is compared against
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* <ref-angle>, or more simply Gy against <ref-angle>*Gx
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*
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* Gx and Gy bounds = [-1020;1020], using 16-bit arithmetic:
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* round((sqrt(2)-1) * (1<<16)) = 27146
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* round((sqrt(2)+1) * (1<<16)) = 158218
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*/
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if (gx) {
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int tanpi8gx, tan3pi8gx;
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if (gx < 0)
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gx = -gx, gy = -gy;
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gy *= (1 << 16);
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tanpi8gx = 27146 * gx;
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tan3pi8gx = 158218 * gx;
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if (gy > -tan3pi8gx && gy < -tanpi8gx) return DIRECTION_45UP;
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if (gy > -tanpi8gx && gy < tanpi8gx) return DIRECTION_HORIZONTAL;
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if (gy > tanpi8gx && gy < tan3pi8gx) return DIRECTION_45DOWN;
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}
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return DIRECTION_VERTICAL;
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}
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// Simple sobel operator to get rounded gradients
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void ff_sobel(int w, int h,
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uint16_t *dst, int dst_linesize,
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int8_t *dir, int dir_linesize,
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const uint8_t *src, int src_linesize)
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{
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int i, j;
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for (j = 1; j < h - 1; j++) {
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dst += dst_linesize;
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dir += dir_linesize;
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src += src_linesize;
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for (i = 1; i < w - 1; i++) {
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const int gx =
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-1*src[-src_linesize + i-1] + 1*src[-src_linesize + i+1]
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-2*src[ i-1] + 2*src[ i+1]
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-1*src[ src_linesize + i-1] + 1*src[ src_linesize + i+1];
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const int gy =
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-1*src[-src_linesize + i-1] + 1*src[ src_linesize + i-1]
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-2*src[-src_linesize + i ] + 2*src[ src_linesize + i ]
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-1*src[-src_linesize + i+1] + 1*src[ src_linesize + i+1];
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dst[i] = FFABS(gx) + FFABS(gy);
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dir[i] = get_rounded_direction(gx, gy);
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}
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}
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}
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// Filters rounded gradients to drop all non-maxima
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// Expects gradients generated by ff_sobel()
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// Expects zero's destination buffer
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void ff_non_maximum_suppression(int w, int h,
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uint8_t *dst, int dst_linesize,
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const int8_t *dir, int dir_linesize,
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const uint16_t *src, int src_linesize)
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{
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int i, j;
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#define COPY_MAXIMA(ay, ax, by, bx) do { \
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if (src[i] > src[(ay)*src_linesize + i+(ax)] && \
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src[i] > src[(by)*src_linesize + i+(bx)]) \
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dst[i] = av_clip_uint8(src[i]); \
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} while (0)
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for (j = 1; j < h - 1; j++) {
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dst += dst_linesize;
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dir += dir_linesize;
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src += src_linesize;
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for (i = 1; i < w - 1; i++) {
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switch (dir[i]) {
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case DIRECTION_45UP: COPY_MAXIMA( 1, -1, -1, 1); break;
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case DIRECTION_45DOWN: COPY_MAXIMA(-1, -1, 1, 1); break;
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case DIRECTION_HORIZONTAL: COPY_MAXIMA( 0, -1, 0, 1); break;
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case DIRECTION_VERTICAL: COPY_MAXIMA(-1, 0, 1, 0); break;
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}
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}
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}
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}
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// Filter to keep all pixels > high, and keep all pixels > low where all surrounding pixels > high
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void ff_double_threshold(int low, int high, int w, int h,
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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 i, j;
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for (j = 0; j < h; j++) {
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for (i = 0; i < w; i++) {
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if (src[i] > high) {
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dst[i] = src[i];
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continue;
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}
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if (!(!i || i == w - 1 || !j || j == h - 1) &&
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src[i] > low &&
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(src[-src_linesize + i-1] > high ||
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src[-src_linesize + i ] > high ||
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src[-src_linesize + i+1] > high ||
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src[ i-1] > high ||
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src[ i+1] > high ||
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src[ src_linesize + i-1] > high ||
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src[ src_linesize + i ] > high ||
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src[ src_linesize + i+1] > high))
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dst[i] = src[i];
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else
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dst[i] = 0;
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}
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dst += dst_linesize;
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src += src_linesize;
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}
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}
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// Applies gaussian blur, using 5x5 kernels, sigma = 1.4
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void ff_gaussian_blur(int w, int h,
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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 i, j;
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memcpy(dst, src, w); dst += dst_linesize; src += src_linesize;
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memcpy(dst, src, w); dst += dst_linesize; src += src_linesize;
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for (j = 2; j < h - 2; j++) {
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dst[0] = src[0];
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dst[1] = src[1];
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for (i = 2; i < w - 2; i++) {
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/* Gaussian mask of size 5x5 with sigma = 1.4 */
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dst[i] = ((src[-2*src_linesize + i-2] + src[2*src_linesize + i-2]) * 2
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+ (src[-2*src_linesize + i-1] + src[2*src_linesize + i-1]) * 4
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+ (src[-2*src_linesize + i ] + src[2*src_linesize + i ]) * 5
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+ (src[-2*src_linesize + i+1] + src[2*src_linesize + i+1]) * 4
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+ (src[-2*src_linesize + i+2] + src[2*src_linesize + i+2]) * 2
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+ (src[ -src_linesize + i-2] + src[ src_linesize + i-2]) * 4
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+ (src[ -src_linesize + i-1] + src[ src_linesize + i-1]) * 9
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+ (src[ -src_linesize + i ] + src[ src_linesize + i ]) * 12
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+ (src[ -src_linesize + i+1] + src[ src_linesize + i+1]) * 9
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+ (src[ -src_linesize + i+2] + src[ src_linesize + i+2]) * 4
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+ src[i-2] * 5
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+ src[i-1] * 12
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+ src[i ] * 15
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+ src[i+1] * 12
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+ src[i+2] * 5) / 159;
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}
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dst[i ] = src[i ];
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dst[i + 1] = src[i + 1];
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dst += dst_linesize;
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src += src_linesize;
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}
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memcpy(dst, src, w); dst += dst_linesize; src += src_linesize;
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memcpy(dst, src, w);
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}
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@ -0,0 +1,107 @@
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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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* common functions for edge detection
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*/
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#ifndef AVFILTER_EDGE_COMMON_H
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#define AVFILTER_EDGE_COMMON_H
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#include "avfilter.h"
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/**
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* @brief Rounded directions used in av_image_sobel()
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*/
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enum AVRoundedDirection {
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DIRECTION_45UP,
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DIRECTION_45DOWN,
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DIRECTION_HORIZONTAL,
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DIRECTION_VERTICAL,
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};
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/**
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* Simple sobel operator to get rounded gradients
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*
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* @param w the width of the image in pixels
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* @param h the height of the image in pixels
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* @param dst data pointers to magnitude image
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* @param dst_linesize linesizes for the magnitude image
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* @param dir data pointers to direction image
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* @param dir_linesize linesizes for the direction image
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* @param src data pointers to source image
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* @param src_linesize linesizes for the source image
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*/
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void ff_sobel(int w, int h,
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uint16_t *dst, int dst_linesize,
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int8_t *dir, int dir_linesize,
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const uint8_t *src, int src_linesize);
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/**
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* Filters rounded gradients to drop all non-maxima pixels in the magnitude image
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* Expects gradients generated by av_image_sobel()
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* Expects zero's in the destination buffer dst
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*
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* @param w the width of the image in pixels
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* @param h the height of the image in pixels
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* @param dst data pointers to magnitude image
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* @param dst_linesize linesizes for the magnitude image
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* @param dir data pointers to direction image
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* @param dir_linesize linesizes for the direction image
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* @param src data pointers to source image
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* @param src_linesize linesizes for the source image
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*/
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void ff_non_maximum_suppression(int w, int h,
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uint8_t *dst, int dst_linesize,
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const int8_t *dir, int dir_linesize,
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const uint16_t *src, int src_linesize);
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/**
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* Filters all pixels in src to keep all pixels > high,
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* and keep all pixels > low where all surrounding pixels > high
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*
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* @param low the low threshold value
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* @param high the hegh threshold value
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* @param w the width of the image in pixels
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* @param h the height of the image in pixels
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* @param dst data pointers to destination image
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* @param dst_linesize linesizes for the destination image
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* @param src data pointers to source image
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* @param src_linesize linesizes for the source image
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*/
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void ff_double_threshold(int low, int high, int w, int h,
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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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* Applies gaussian blur.
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* 5x5 kernels, sigma = 1.4
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*
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* @param w the width of the image in pixels
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* @param h the height of the image in pixels
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* @param dst data pointers to destination image
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* @param dst_linesize linesizes for the destination image
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* @param src data pointers to source image
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* @param src_linesize linesizes for the source image
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*/
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void ff_gaussian_blur(int w, int h,
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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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#endif
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@ -32,6 +32,7 @@
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#include "formats.h"
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#include "formats.h"
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#include "internal.h"
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#include "internal.h"
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#include "video.h"
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#include "video.h"
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#include "edge_common.h"
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#define PLANE_R 0x4
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#define PLANE_R 0x4
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#define PLANE_G 0x1
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#define PLANE_G 0x1
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@ -139,176 +140,6 @@ static int config_props(AVFilterLink *inlink)
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return 0;
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return 0;
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}
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}
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static void gaussian_blur(AVFilterContext *ctx, int w, int h,
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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 i, j;
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memcpy(dst, src, w); dst += dst_linesize; src += src_linesize;
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if (h > 1) {
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memcpy(dst, src, w); dst += dst_linesize; src += src_linesize;
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}
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for (j = 2; j < h - 2; j++) {
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dst[0] = src[0];
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if (w > 1)
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dst[1] = src[1];
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for (i = 2; i < w - 2; i++) {
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/* Gaussian mask of size 5x5 with sigma = 1.4 */
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dst[i] = ((src[-2*src_linesize + i-2] + src[2*src_linesize + i-2]) * 2
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+ (src[-2*src_linesize + i-1] + src[2*src_linesize + i-1]) * 4
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+ (src[-2*src_linesize + i ] + src[2*src_linesize + i ]) * 5
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+ (src[-2*src_linesize + i+1] + src[2*src_linesize + i+1]) * 4
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+ (src[-2*src_linesize + i+2] + src[2*src_linesize + i+2]) * 2
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+ (src[ -src_linesize + i-2] + src[ src_linesize + i-2]) * 4
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+ (src[ -src_linesize + i-1] + src[ src_linesize + i-1]) * 9
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||||||
+ (src[ -src_linesize + i ] + src[ src_linesize + i ]) * 12
|
|
||||||
+ (src[ -src_linesize + i+1] + src[ src_linesize + i+1]) * 9
|
|
||||||
+ (src[ -src_linesize + i+2] + src[ src_linesize + i+2]) * 4
|
|
||||||
|
|
||||||
+ src[i-2] * 5
|
|
||||||
+ src[i-1] * 12
|
|
||||||
+ src[i ] * 15
|
|
||||||
+ src[i+1] * 12
|
|
||||||
+ src[i+2] * 5) / 159;
|
|
||||||
}
|
|
||||||
if (w > 2)
|
|
||||||
dst[i ] = src[i ];
|
|
||||||
if (w > 3)
|
|
||||||
dst[i + 1] = src[i + 1];
|
|
||||||
|
|
||||||
dst += dst_linesize;
|
|
||||||
src += src_linesize;
|
|
||||||
}
|
|
||||||
if (h > 2) {
|
|
||||||
memcpy(dst, src, w); dst += dst_linesize; src += src_linesize;
|
|
||||||
}
|
|
||||||
if (h > 3)
|
|
||||||
memcpy(dst, src, w);
|
|
||||||
}
|
|
||||||
|
|
||||||
enum {
|
|
||||||
DIRECTION_45UP,
|
|
||||||
DIRECTION_45DOWN,
|
|
||||||
DIRECTION_HORIZONTAL,
|
|
||||||
DIRECTION_VERTICAL,
|
|
||||||
};
|
|
||||||
|
|
||||||
static int get_rounded_direction(int gx, int gy)
|
|
||||||
{
|
|
||||||
/* reference angles:
|
|
||||||
* tan( pi/8) = sqrt(2)-1
|
|
||||||
* tan(3pi/8) = sqrt(2)+1
|
|
||||||
* Gy/Gx is the tangent of the angle (theta), so Gy/Gx is compared against
|
|
||||||
* <ref-angle>, or more simply Gy against <ref-angle>*Gx
|
|
||||||
*
|
|
||||||
* Gx and Gy bounds = [-1020;1020], using 16-bit arithmetic:
|
|
||||||
* round((sqrt(2)-1) * (1<<16)) = 27146
|
|
||||||
* round((sqrt(2)+1) * (1<<16)) = 158218
|
|
||||||
*/
|
|
||||||
if (gx) {
|
|
||||||
int tanpi8gx, tan3pi8gx;
|
|
||||||
|
|
||||||
if (gx < 0)
|
|
||||||
gx = -gx, gy = -gy;
|
|
||||||
gy *= (1 << 16);
|
|
||||||
tanpi8gx = 27146 * gx;
|
|
||||||
tan3pi8gx = 158218 * gx;
|
|
||||||
if (gy > -tan3pi8gx && gy < -tanpi8gx) return DIRECTION_45UP;
|
|
||||||
if (gy > -tanpi8gx && gy < tanpi8gx) return DIRECTION_HORIZONTAL;
|
|
||||||
if (gy > tanpi8gx && gy < tan3pi8gx) return DIRECTION_45DOWN;
|
|
||||||
}
|
|
||||||
return DIRECTION_VERTICAL;
|
|
||||||
}
|
|
||||||
|
|
||||||
static void sobel(int w, int h,
|
|
||||||
uint16_t *dst, int dst_linesize,
|
|
||||||
int8_t *dir, int dir_linesize,
|
|
||||||
const uint8_t *src, int src_linesize)
|
|
||||||
{
|
|
||||||
int i, j;
|
|
||||||
|
|
||||||
for (j = 1; j < h - 1; j++) {
|
|
||||||
dst += dst_linesize;
|
|
||||||
dir += dir_linesize;
|
|
||||||
src += src_linesize;
|
|
||||||
for (i = 1; i < w - 1; i++) {
|
|
||||||
const int gx =
|
|
||||||
-1*src[-src_linesize + i-1] + 1*src[-src_linesize + i+1]
|
|
||||||
-2*src[ i-1] + 2*src[ i+1]
|
|
||||||
-1*src[ src_linesize + i-1] + 1*src[ src_linesize + i+1];
|
|
||||||
const int gy =
|
|
||||||
-1*src[-src_linesize + i-1] + 1*src[ src_linesize + i-1]
|
|
||||||
-2*src[-src_linesize + i ] + 2*src[ src_linesize + i ]
|
|
||||||
-1*src[-src_linesize + i+1] + 1*src[ src_linesize + i+1];
|
|
||||||
|
|
||||||
dst[i] = FFABS(gx) + FFABS(gy);
|
|
||||||
dir[i] = get_rounded_direction(gx, gy);
|
|
||||||
}
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
static void non_maximum_suppression(int w, int h,
|
|
||||||
uint8_t *dst, int dst_linesize,
|
|
||||||
const int8_t *dir, int dir_linesize,
|
|
||||||
const uint16_t *src, int src_linesize)
|
|
||||||
{
|
|
||||||
int i, j;
|
|
||||||
|
|
||||||
#define COPY_MAXIMA(ay, ax, by, bx) do { \
|
|
||||||
if (src[i] > src[(ay)*src_linesize + i+(ax)] && \
|
|
||||||
src[i] > src[(by)*src_linesize + i+(bx)]) \
|
|
||||||
dst[i] = av_clip_uint8(src[i]); \
|
|
||||||
} while (0)
|
|
||||||
|
|
||||||
for (j = 1; j < h - 1; j++) {
|
|
||||||
dst += dst_linesize;
|
|
||||||
dir += dir_linesize;
|
|
||||||
src += src_linesize;
|
|
||||||
for (i = 1; i < w - 1; i++) {
|
|
||||||
switch (dir[i]) {
|
|
||||||
case DIRECTION_45UP: COPY_MAXIMA( 1, -1, -1, 1); break;
|
|
||||||
case DIRECTION_45DOWN: COPY_MAXIMA(-1, -1, 1, 1); break;
|
|
||||||
case DIRECTION_HORIZONTAL: COPY_MAXIMA( 0, -1, 0, 1); break;
|
|
||||||
case DIRECTION_VERTICAL: COPY_MAXIMA(-1, 0, 1, 0); break;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
static void double_threshold(int low, int high, int w, int h,
|
|
||||||
uint8_t *dst, int dst_linesize,
|
|
||||||
const uint8_t *src, int src_linesize)
|
|
||||||
{
|
|
||||||
int i, j;
|
|
||||||
|
|
||||||
for (j = 0; j < h; j++) {
|
|
||||||
for (i = 0; i < w; i++) {
|
|
||||||
if (src[i] > high) {
|
|
||||||
dst[i] = src[i];
|
|
||||||
continue;
|
|
||||||
}
|
|
||||||
|
|
||||||
if (!(!i || i == w - 1 || !j || j == h - 1) &&
|
|
||||||
src[i] > low &&
|
|
||||||
(src[-src_linesize + i-1] > high ||
|
|
||||||
src[-src_linesize + i ] > high ||
|
|
||||||
src[-src_linesize + i+1] > high ||
|
|
||||||
src[ i-1] > high ||
|
|
||||||
src[ i+1] > high ||
|
|
||||||
src[ src_linesize + i-1] > high ||
|
|
||||||
src[ src_linesize + i ] > high ||
|
|
||||||
src[ src_linesize + i+1] > high))
|
|
||||||
dst[i] = src[i];
|
|
||||||
else
|
|
||||||
dst[i] = 0;
|
|
||||||
}
|
|
||||||
dst += dst_linesize;
|
|
||||||
src += src_linesize;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
static void color_mix(int w, int h,
|
static void color_mix(int w, int h,
|
||||||
uint8_t *dst, int dst_linesize,
|
uint8_t *dst, int dst_linesize,
|
||||||
const uint8_t *src, int src_linesize)
|
const uint8_t *src, int src_linesize)
|
||||||
|
@ -360,12 +191,12 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
|
||||||
}
|
}
|
||||||
|
|
||||||
/* gaussian filter to reduce noise */
|
/* gaussian filter to reduce noise */
|
||||||
gaussian_blur(ctx, width, height,
|
ff_gaussian_blur(width, height,
|
||||||
tmpbuf, width,
|
tmpbuf, width,
|
||||||
in->data[p], in->linesize[p]);
|
in->data[p], in->linesize[p]);
|
||||||
|
|
||||||
/* compute the 16-bits gradients and directions for the next step */
|
/* compute the 16-bits gradients and directions for the next step */
|
||||||
sobel(width, height,
|
ff_sobel(width, height,
|
||||||
gradients, width,
|
gradients, width,
|
||||||
directions,width,
|
directions,width,
|
||||||
tmpbuf, width);
|
tmpbuf, width);
|
||||||
|
@ -373,13 +204,13 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
|
||||||
/* non_maximum_suppression() will actually keep & clip what's necessary and
|
/* non_maximum_suppression() will actually keep & clip what's necessary and
|
||||||
* ignore the rest, so we need a clean output buffer */
|
* ignore the rest, so we need a clean output buffer */
|
||||||
memset(tmpbuf, 0, width * height);
|
memset(tmpbuf, 0, width * height);
|
||||||
non_maximum_suppression(width, height,
|
ff_non_maximum_suppression(width, height,
|
||||||
tmpbuf, width,
|
tmpbuf, width,
|
||||||
directions,width,
|
directions,width,
|
||||||
gradients, width);
|
gradients, width);
|
||||||
|
|
||||||
/* keep high values, or low values surrounded by high values */
|
/* keep high values, or low values surrounded by high values */
|
||||||
double_threshold(edgedetect->low_u8, edgedetect->high_u8,
|
ff_double_threshold(edgedetect->low_u8, edgedetect->high_u8,
|
||||||
width, height,
|
width, height,
|
||||||
out->data[p], out->linesize[p],
|
out->data[p], out->linesize[p],
|
||||||
tmpbuf, width);
|
tmpbuf, width);
|
||||||
|
|
Loading…
Reference in New Issue