ref: 682135fa60892de2170719f546f62d37f15ed90f
parent: 666e394d41c68e9a57866fc3bd70e54b36d43ab4
author: Jerome Jiang <jianj@google.com>
date: Fri Jul 14 09:45:33 EDT 2017
vp9: Compute skin only for blocks eligible for noise estimation. Change-Id: Iddcb83a5968db57cfd312c5bc44b2a226a2a3264
--- a/vp9/encoder/vp9_noise_estimate.c
+++ b/vp9/encoder/vp9_noise_estimate.c
@@ -172,7 +172,6 @@
int mi_row, mi_col;
int num_low_motion = 0;
int frame_low_motion = 1;
- if (cpi->use_skin_detection) vp9_compute_skin_map(cpi, BLOCK_16X16);
for (mi_row = 0; mi_row < cm->mi_rows; mi_row++) { for (mi_col = 0; mi_col < cm->mi_cols; mi_col++) {int bl_index = mi_row * cm->mi_cols + mi_col;
@@ -191,35 +190,42 @@
int bl_index1 = bl_index + 1;
int bl_index2 = bl_index + cm->mi_cols;
int bl_index3 = bl_index2 + 1;
- int is_skin = 0;
- if (cpi->use_skin_detection) is_skin = cpi->skin_map[bl_index];
+ int 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])));
// Only consider blocks that are likely steady background. i.e, have
// been encoded as zero/low motion x (= thresh_consec_zeromv) frames
// in a row. consec_zero_mv[] defined for 8x8 blocks, so consider all
// 4 sub-blocks for 16x16 block. Also, avoid skin blocks.
- if (frame_low_motion &&
- cpi->consec_zero_mv[bl_index] > thresh_consec_zeromv &&
- cpi->consec_zero_mv[bl_index1] > thresh_consec_zeromv &&
- cpi->consec_zero_mv[bl_index2] > thresh_consec_zeromv &&
- cpi->consec_zero_mv[bl_index3] > thresh_consec_zeromv &&
- !is_skin) {- // Compute variance.
- unsigned int sse;
- unsigned int variance = cpi->fn_ptr[bsize].vf(
- src_y, src_ystride, last_src_y, last_src_ystride, &sse);
- // Only consider this block as valid for noise measurement if the
- // average term (sse - variance = N * avg^{2}, N = 16X16) of the- // temporal residual is small (avoid effects from lighting change).
- if ((sse - variance) < thresh_sum_diff) {- unsigned int sse2;
- const unsigned int spatial_variance = cpi->fn_ptr[bsize].vf(
- src_y, src_ystride, const_source, 0, &sse2);
- // Avoid blocks with high brightness and high spatial variance.
- if ((sse2 - spatial_variance) < thresh_sum_spatial &&
- spatial_variance < thresh_spatial_var) {- avg_est += low_res ? variance >> 4
- : variance / ((spatial_variance >> 9) + 1);
- num_samples++;
+ if (frame_low_motion && consec_zeromv > thresh_consec_zeromv) {+ int is_skin = 0;
+ if (cpi->use_skin_detection) {+ is_skin =
+ vp9_compute_skin_block(src_y, src_u, src_v, src_ystride,
+ src_uvstride, bsize, consec_zeromv, 0);
+ }
+ if (!is_skin) {+ unsigned int sse;
+ // Compute variance.
+ unsigned int variance = cpi->fn_ptr[bsize].vf(
+ src_y, src_ystride, last_src_y, last_src_ystride, &sse);
+ // Only consider this block as valid for noise measurement if the
+ // average term (sse - variance = N * avg^{2}, N = 16X16) of the+ // temporal residual is small (avoid effects from lighting
+ // change).
+ if ((sse - variance) < thresh_sum_diff) {+ unsigned int sse2;
+ const unsigned int spatial_variance = cpi->fn_ptr[bsize].vf(
+ src_y, src_ystride, const_source, 0, &sse2);
+ // Avoid blocks with high brightness and high spatial variance.
+ if ((sse2 - spatial_variance) < thresh_sum_spatial &&
+ spatial_variance < thresh_spatial_var) {+ avg_est += low_res ? variance >> 4
+ : variance / ((spatial_variance >> 9) + 1);
+ num_samples++;
+ }
}
}
}