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vp8: Remove isolated skin & non skin blocks.

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Neutral on RTC metrics and speed on Pixel.

Change-Id: I26b907483fe133e6e4c1009d147631f0d0e0f2fb
This commit is contained in:
Jerome Jiang 2017-07-19 13:02:53 -07:00
parent 59e461db1f
commit 56d95b77f5
1 changed files with 25 additions and 3 deletions
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28
vp8/encoder/onyx_if.c
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@ -628,16 +628,15 @@ static void compute_skin_map(VP8_COMP *cpi) {
const SKIN_DETECTION_BLOCK_SIZE bsize =
(cm->Width * cm->Height <= 352 * 288) ? SKIN_8X8 : SKIN_16X16;
int offset = 0;
for (mb_row = 0; mb_row < cm->mb_rows; mb_row++) {
num_bl = 0;
for (mb_col = 0; mb_col < cm->mb_cols; mb_col++) {
const int bl_index = mb_row * cm->mb_cols + mb_col;
cpi->skin_map[offset] =
cpi->skin_map[bl_index] =
vp8_compute_skin_block(src_y, src_u, src_v, src_ystride, src_uvstride,
bsize, cpi->consec_zero_last[bl_index], 0);
num_bl++;
offset++;
src_y += 16;
src_u += 8;
src_v += 8;
@ -646,6 +645,29 @@ static void compute_skin_map(VP8_COMP *cpi) {
src_u += (src_uvstride << 3) - (num_bl << 3);
src_v += (src_uvstride << 3) - (num_bl << 3);
}
// Remove isolated skin blocks (none of its neighbors are skin) and isolated
// non-skin blocks (all of its neighbors are skin). Skip the boundary.
for (mb_row = 1; mb_row < cm->mb_rows - 1; mb_row++) {
for (mb_col = 1; mb_col < cm->mb_cols - 1; mb_col++) {
const int bl_index = mb_row * cm->mb_cols + mb_col;
int num_neighbor = 0;
int mi, mj;
int non_skin_threshold = 8;
for (mi = -1; mi <= 1; mi += 1) {
for (mj = -1; mj <= 1; mj += 1) {
int bl_neighbor_index = (mb_row + mi) * cm->mb_cols + mb_col + mj;
if (cpi->skin_map[bl_neighbor_index]) num_neighbor++;
}
}
if (cpi->skin_map[bl_index] && num_neighbor < 2)
cpi->skin_map[bl_index] = 0;
if (!cpi->skin_map[bl_index] && num_neighbor == non_skin_threshold)
cpi->skin_map[bl_index] = 1;
}
}
}
static void set_default_lf_deltas(VP8_COMP *cpi) {