ref: 3e7aa8fda91b5698201f491bc1ac946e96dcb3c3
dir: /vp9/encoder/vp9_skin_detection.c/
/*
* Copyright (c) 2015 The WebM project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include <limits.h>
#include <math.h>
#include "vp9/common/vp9_blockd.h"
#include "vp9/encoder/vp9_encoder.h"
#include "vp9/encoder/vp9_skin_detection.h"
#define MODEL_MODE 1
// Fixed-point skin color model parameters.
static const int skin_mean[5][2] = { { 7463, 9614 },
{ 6400, 10240 },
{ 7040, 10240 },
{ 8320, 9280 },
{ 6800, 9614 } };
static const int skin_inv_cov[4] = { 4107, 1663, 1663, 2157 }; // q16
static const int skin_threshold[6] = { 1570636, 1400000, 800000,
800000, 800000, 800000 }; // q18
// Thresholds on luminance.
static const int y_low = 40;
static const int y_high = 220;
// Evaluates the Mahalanobis distance measure for the input CbCr values.
static int evaluate_skin_color_difference(int cb, int cr, int idx) {
const int cb_q6 = cb << 6;
const int cr_q6 = cr << 6;
const int cb_diff_q12 =
(cb_q6 - skin_mean[idx][0]) * (cb_q6 - skin_mean[idx][0]);
const int cbcr_diff_q12 =
(cb_q6 - skin_mean[idx][0]) * (cr_q6 - skin_mean[idx][1]);
const int cr_diff_q12 =
(cr_q6 - skin_mean[idx][1]) * (cr_q6 - skin_mean[idx][1]);
const int cb_diff_q2 = (cb_diff_q12 + (1 << 9)) >> 10;
const int cbcr_diff_q2 = (cbcr_diff_q12 + (1 << 9)) >> 10;
const int cr_diff_q2 = (cr_diff_q12 + (1 << 9)) >> 10;
const int skin_diff =
skin_inv_cov[0] * cb_diff_q2 + skin_inv_cov[1] * cbcr_diff_q2 +
skin_inv_cov[2] * cbcr_diff_q2 + skin_inv_cov[3] * cr_diff_q2;
return skin_diff;
}
int vp9_skin_pixel(const uint8_t y, const uint8_t cb, const uint8_t cr,
int motion) {
if (y < y_low || y > y_high) {
return 0;
} else {
if (MODEL_MODE == 0) {
return (evaluate_skin_color_difference(cb, cr, 0) < skin_threshold[0]);
} else {
int i = 0;
// Exit on grey.
if (cb == 128 && cr == 128) return 0;
// Exit on very strong cb.
if (cb > 150 && cr < 110) return 0;
for (; i < 5; i++) {
int skin_color_diff = evaluate_skin_color_difference(cb, cr, i);
if (skin_color_diff < skin_threshold[i + 1]) {
if (y < 60 && skin_color_diff > 3 * (skin_threshold[i + 1] >> 2))
return 0;
else if (motion == 0 &&
skin_color_diff > (skin_threshold[i + 1] >> 1))
return 0;
else
return 1;
}
// Exit if difference is much large than the threshold.
if (skin_color_diff > (skin_threshold[i + 1] << 3)) {
return 0;
}
}
return 0;
}
}
}
int vp9_compute_skin_block(const uint8_t *y, const uint8_t *u, const uint8_t *v,
int stride, int strideuv, int bsize,
int consec_zeromv, int curr_motion_magn) {
// No skin if block has been zero/small motion for long consecutive time.
if (consec_zeromv > 60 && curr_motion_magn == 0) {
return 0;
} else {
int motion = 1;
// Take center pixel in block to determine is_skin.
const int y_width_shift = (4 << b_width_log2_lookup[bsize]) >> 1;
const int y_height_shift = (4 << b_height_log2_lookup[bsize]) >> 1;
const int uv_width_shift = y_width_shift >> 1;
const int uv_height_shift = y_height_shift >> 1;
const uint8_t ysource = y[y_height_shift * stride + y_width_shift];
const uint8_t usource = u[uv_height_shift * strideuv + uv_width_shift];
const uint8_t vsource = v[uv_height_shift * strideuv + uv_width_shift];
if (consec_zeromv > 25 && curr_motion_magn == 0) motion = 0;
return vp9_skin_pixel(ysource, usource, vsource, motion);
}
}
#ifdef OUTPUT_YUV_SKINMAP
// For viewing skin map on input source.
void vp9_compute_skin_map(VP9_COMP *const cpi, FILE *yuv_skinmap_file) {
int i, j, mi_row, mi_col, num_bl;
VP9_COMMON *const cm = &cpi->common;
uint8_t *y;
const uint8_t *src_y = cpi->Source->y_buffer;
const uint8_t *src_u = cpi->Source->u_buffer;
const uint8_t *src_v = cpi->Source->v_buffer;
const int src_ystride = cpi->Source->y_stride;
const int src_uvstride = cpi->Source->uv_stride;
int y_bsize = 16; // Use 8x8 or 16x16.
int uv_bsize = y_bsize >> 1;
int ypos = y_bsize >> 1;
int uvpos = uv_bsize >> 1;
int shy = (y_bsize == 8) ? 3 : 4;
int shuv = shy - 1;
int fac = y_bsize / 8;
// Use center pixel or average of center 2x2 pixels.
int mode_filter = 0;
YV12_BUFFER_CONFIG skinmap;
memset(&skinmap, 0, sizeof(YV12_BUFFER_CONFIG));
if (vpx_alloc_frame_buffer(&skinmap, cm->width, cm->height, cm->subsampling_x,
cm->subsampling_y, VP9_ENC_BORDER_IN_PIXELS,
cm->byte_alignment)) {
vpx_free_frame_buffer(&skinmap);
return;
}
memset(skinmap.buffer_alloc, 128, skinmap.frame_size);
y = skinmap.y_buffer;
// Loop through blocks and set skin map based on center pixel of block.
// Set y to white for skin block, otherwise set to source with gray scale.
// Ignore rightmost/bottom boundary blocks.
for (mi_row = 0; mi_row < cm->mi_rows - 1; mi_row += fac) {
num_bl = 0;
for (mi_col = 0; mi_col < cm->mi_cols - 1; mi_col += fac) {
int is_skin = 0;
if (mode_filter == 1) {
// Use 2x2 average at center.
uint8_t ysource = src_y[ypos * src_ystride + ypos];
uint8_t usource = src_u[uvpos * src_uvstride + uvpos];
uint8_t vsource = src_v[uvpos * src_uvstride + uvpos];
uint8_t ysource2 = src_y[(ypos + 1) * src_ystride + ypos];
uint8_t usource2 = src_u[(uvpos + 1) * src_uvstride + uvpos];
uint8_t vsource2 = src_v[(uvpos + 1) * src_uvstride + uvpos];
uint8_t ysource3 = src_y[ypos * src_ystride + (ypos + 1)];
uint8_t usource3 = src_u[uvpos * src_uvstride + (uvpos + 1)];
uint8_t vsource3 = src_v[uvpos * src_uvstride + (uvpos + 1)];
uint8_t ysource4 = src_y[(ypos + 1) * src_ystride + (ypos + 1)];
uint8_t usource4 = src_u[(uvpos + 1) * src_uvstride + (uvpos + 1)];
uint8_t vsource4 = src_v[(uvpos + 1) * src_uvstride + (uvpos + 1)];
ysource = (ysource + ysource2 + ysource3 + ysource4) >> 2;
usource = (usource + usource2 + usource3 + usource4) >> 2;
vsource = (vsource + vsource2 + vsource3 + vsource4) >> 2;
is_skin = vp9_skin_pixel(ysource, usource, vsource, 1);
} else {
int block_size = BLOCK_8X8;
int consec_zeromv = 0;
int bl_index = mi_row * cm->mi_cols + mi_col;
int bl_index1 = bl_index + 1;
int bl_index2 = bl_index + cm->mi_cols;
int bl_index3 = bl_index2 + 1;
if (y_bsize == 8)
consec_zeromv = cpi->consec_zero_mv[bl_index];
else
consec_zeromv =
VPXMIN(cpi->consec_zero_mv[bl_index],
VPXMIN(cpi->consec_zero_mv[bl_index1],
VPXMIN(cpi->consec_zero_mv[bl_index2],
cpi->consec_zero_mv[bl_index3])));
if (y_bsize == 16) block_size = BLOCK_16X16;
is_skin =
vp9_compute_skin_block(src_y, src_u, src_v, src_ystride,
src_uvstride, block_size, consec_zeromv, 0);
}
for (i = 0; i < y_bsize; i++) {
for (j = 0; j < y_bsize; j++) {
if (is_skin)
y[i * src_ystride + j] = 255;
else
y[i * src_ystride + j] = src_y[i * src_ystride + j];
}
}
num_bl++;
y += y_bsize;
src_y += y_bsize;
src_u += uv_bsize;
src_v += uv_bsize;
}
y += (src_ystride << shy) - (num_bl << shy);
src_y += (src_ystride << shy) - (num_bl << shy);
src_u += (src_uvstride << shuv) - (num_bl << shuv);
src_v += (src_uvstride << shuv) - (num_bl << shuv);
}
vp9_write_yuv_frame_420(&skinmap, yuv_skinmap_file);
vpx_free_frame_buffer(&skinmap);
}
#endif