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vp9-skinmap. Some adjustments for model=1.

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-use larger threshold on y (as in vp8).
-add distance threshold for each cluster
-use larger skin distance threshold for first cluster
-add some early exist checks.

Keep default setting to model=0.

Change-Id: I1044b99ade4bb1f215a860a019a4d84cee2f7715
This commit is contained in:
Marco
2016-02-03 14:21:59 -08:00
parent 2231d1063c
commit 82148c02c1
1 changed files with 18 additions and 3 deletions
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21
vp9/encoder/vp9_skin_detection.c
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@@ -21,10 +21,11 @@
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[2] = {1570636, 800000}; // q18
static const int skin_threshold[6] = {1570636, 1400000, 800000, 800000, 800000,
800000}; // q18
// Thresholds on luminance.
static const int y_low = 20;
static const int y_low = 40;
static const int y_high = 220;
// Evaluates the Mahalanobis distance measure for the input CbCr values.
@@ -55,10 +56,24 @@ int vp9_skin_pixel(const uint8_t y, const uint8_t cb, const uint8_t cr) {
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;
// Exit on (another) low luminance threshold if either color is high.
if (y < 50 && (cb > 140 || cr > 140))
return 0;
for (; i < 5; i++) {
if (evaluate_skin_color_difference(cb, cr, i) < skin_threshold[1]) {
if (evaluate_skin_color_difference(cb, cr, i) < skin_threshold[i + 1]) {
return 1;
}
// Exit if difference is much large than the threshold.
if (evaluate_skin_color_difference(cb, cr, i) >
(skin_threshold[i + 1] << 3)) {
return 0;
}
}
return 0;
}