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Merge skin detection code in vp8/9.

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BUG=webm:1438

Change-Id: Ie3dc034c7dbb498a0b088a767b1936ddeed4df14
This commit is contained in:
Jerome Jiang 2017-06-05 11:09:05 -07:00
parent e30781ff80
commit 658e854252
9 changed files with 120 additions and 157 deletions
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73
vp8/common/skin_detection.c
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@ -13,77 +13,6 @@
#include "vpx_dsp/vpx_dsp_common.h"
#include "vpx_mem/vpx_mem.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(const int cb, const int cr,
const 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;
}
// Checks if the input yCbCr values corresponds to skin color.
int skin_pixel(int y, int cb, int 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 compute_skin_block(const uint8_t *y, const uint8_t *u, const uint8_t *v,
int stride, int strideuv, int consec_zeromv,
int curr_motion_magn) {
@ -103,7 +32,7 @@ int compute_skin_block(const uint8_t *y, const uint8_t *u, const uint8_t *v,
v[4 * strideuv + 3] + v[4 * strideuv + 4]) >>
2;
if (consec_zeromv > 25 && curr_motion_magn == 0) motion = 0;
return skin_pixel(ysource, usource, vsource, motion);
return vpx_skin_pixel(ysource, usource, vsource, motion);
}
}

11
vp8/common/skin_detection.h
View File

@ -8,11 +8,12 @@
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef VP8_ENCODER_SKIN_DETECTION_H_
#define VP8_ENCODER_SKIN_DETECTION_H_
#ifndef VP8_COMMON_SKIN_DETECTION_H_
#define VP8_COMMON_SKIN_DETECTION_H_
#include "vp8/encoder/onyx_int.h"
#include "vpx/vpx_integer.h"
#include "vpx_dsp/skin_detection.h"
#include "vpx_scale/yv12config.h"
#ifdef __cplusplus
@ -21,10 +22,6 @@ extern "C" {
struct VP8_COMP;
// #define OUTPUT_YUV_SKINMAP
int skin_pixel(int y, int cb, int cr, int motion);
int compute_skin_block(const uint8_t *y, const uint8_t *u, const uint8_t *v,
int stride, int strideuv, int consec_zeromv,
int curr_motion_magn);
@ -39,4 +36,4 @@ extern void vp8_write_yuv_frame(FILE *f, YV12_BUFFER_CONFIG *s);
} // extern "C"
#endif
#endif // VP8_ENCODER_SKIN_DETECTION_H_
#endif // VP8_COMMON_SKIN_DETECTION_H_

2
vp8/encoder/onyx_if.c
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@ -89,7 +89,7 @@ FILE *yuv_file;
FILE *yuv_denoised_file;
#endif
#ifdef OUTPUT_YUV_SKINMAP
FILE *yuv_skinmap_file = NULL;
static FILE *yuv_skinmap_file = NULL;
#endif
#if 0

3
vp9/encoder/vp9_encoder.c
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@ -80,7 +80,7 @@
FILE *yuv_denoised_file = NULL;
#endif
#ifdef OUTPUT_YUV_SKINMAP
FILE *yuv_skinmap_file = NULL;
static FILE *yuv_skinmap_file = NULL;
#endif
#ifdef OUTPUT_YUV_REC
FILE *yuv_rec_file;
@ -2586,6 +2586,7 @@ int vp9_update_entropy(VP9_COMP *cpi, int update) {
// as YUV 420. We simply use the top-left pixels of the UV buffers, since we do
// not denoise the UV channels at this time. If ever we implement UV channel
// denoising we will have to modify this.
// TODO(jianj): Remove the duplicated one in vp8 and move it to vpx_util.
void vp9_write_yuv_frame_420(YV12_BUFFER_CONFIG *s, FILE *f) {
uint8_t *src = s->y_buffer;
int h = s->y_crop_height;

73
vp9/encoder/vp9_skin_detection.c
View File

@ -15,75 +15,6 @@
#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) {
@ -101,7 +32,7 @@ int vp9_compute_skin_block(const uint8_t *y, const uint8_t *u, const uint8_t *v,
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);
return vpx_skin_pixel(ysource, usource, vsource, motion);
}
}
@ -159,7 +90,7 @@ void vp9_compute_skin_map(VP9_COMP *const cpi, FILE *yuv_skinmap_file) {
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);
is_skin = vpx_skin_pixel(ysource, usource, vsource, 1);
} else {
int block_size = BLOCK_8X8;
int consec_zeromv = 0;

6
vp9/encoder/vp9_skin_detection.h
View File

@ -12,6 +12,7 @@
#define VP9_ENCODER_VP9_SKIN_MAP_H_
#include "vp9/common/vp9_blockd.h"
#include "vpx_dsp/skin_detection.h"
#ifdef __cplusplus
extern "C" {
@ -19,11 +20,6 @@ extern "C" {
struct VP9_COMP;
// #define OUTPUT_YUV_SKINMAP
int vp9_skin_pixel(const uint8_t y, const uint8_t cb, const uint8_t cr,
int motion);
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);

79
vpx_dsp/skin_detection.c Normal file
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@ -0,0 +1,79 @@
/*
* Copyright (c) 2017 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 "vpx_dsp/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 vpx_evaluate_skin_color_difference(const int cb, const int cr,
const 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;
}
// Checks if the input yCbCr values corresponds to skin color.
int vpx_skin_pixel(const int y, const int cb, const int cr, int motion) {
if (y < y_low || y > y_high) {
return 0;
} else if (MODEL_MODE == 0) {
return (vpx_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 = vpx_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;
}
}

26
vpx_dsp/skin_detection.h Normal file
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@ -0,0 +1,26 @@
/*
* Copyright (c) 2017 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.
*/
#ifndef VPX_DSP_SKIN_DETECTION_H_
#define VPX_DSP_SKIN_DETECTION_H_
#ifdef __cplusplus
extern "C" {
#endif
// #define OUTPUT_YUV_SKINMAP
int vpx_skin_pixel(const int y, const int cb, const int cr, int motion);
#ifdef __cplusplus
} // extern "C"
#endif
#endif // VPX_DSP_SKIN_DETECTION_H_

4
vpx_dsp/vpx_dsp.mk
View File

@ -286,6 +286,10 @@ DSP_SRCS-$(HAVE_VSX) += ppc/hadamard_vsx.c
endif # CONFIG_VP9_ENCODER
# skin detection
DSP_SRCS-yes += skin_detection.h
DSP_SRCS-yes += skin_detection.c
ifeq ($(CONFIG_ENCODERS),yes)
DSP_SRCS-yes += sad.c
DSP_SRCS-yes += subtract.c