Temporal filter: new function to model control parameter h
h = decay_control * (0.7 + ln(sigma + 0.5))
This change leads to larger decay, i.e., stronger smoothing when
sigma (noise) is larger.
It applies to frame sizes (min of width and height) >= 480.
Lowres and ugc360 set are therefore the same.
Net metric gains are observed.
speed4 avg_psnr ovr_psnr ssim vmaf
midres -0.08 -0.12 -0.11 -0.12
hdres -0.34 -0.31 -0.43 -0.23
speed1 avg_psnr ovr_psnr ssim vmaf
midres -0.02 -0.03 -0.10 -0.14
hdres -0.25 -0.22 -0.35 -0.00
STATS_CHANGED
Change-Id: Ia232c55412ffee4aa23e9b21890d6bae593154df
diff --git a/av1/encoder/temporal_filter.c b/av1/encoder/temporal_filter.c
index fb94e20..6ba08d0 100644
--- a/av1/encoder/temporal_filter.c
+++ b/av1/encoder/temporal_filter.c
@@ -688,8 +688,7 @@
(void)strength;
(void)blk_fw;
(void)use_32x32;
- const double decay = decay_control * exp(1 - sigma);
- const double h = AOMMAX(decay * sigma, 0.1);
+ const double h = decay_control * (0.7 + log(sigma + 0.5));
const double beta = 1.0;
for (int i = 0, k = 0; i < block_height; i++) {
for (int j = 0; j < block_width; j++, k++) {
@@ -734,8 +733,7 @@
(void)use_32x32;
uint16_t *frame1 = CONVERT_TO_SHORTPTR(frame1_8bit);
uint16_t *frame2 = CONVERT_TO_SHORTPTR(frame2_8bit);
- const double decay = decay_control * exp(1 - sigma);
- const double h = decay * sigma;
+ const double h = decay_control * (0.7 + log(sigma + 0.5));
const double beta = 1.0;
for (int i = 0, k = 0; i < block_height; i++) {
for (int j = 0; j < block_width; j++, k++) {
@@ -786,9 +784,9 @@
int decay_control;
// The decay is obtained empirically, subject to better tuning.
if (frame_height >= 720) {
- decay_control = 7;
+ decay_control = 4;
} else if (frame_height >= 480) {
- decay_control = 5;
+ decay_control = 4;
} else {
decay_control = 3;
}
@@ -838,9 +836,9 @@
int decay_control;
// The decay is obtained empirically, subject to better tuning.
if (frame_height >= 720) {
- decay_control = 7;
+ decay_control = 4;
} else if (frame_height >= 480) {
- decay_control = 5;
+ decay_control = 4;
} else {
decay_control = 3;
}
@@ -1035,8 +1033,8 @@
const int mb_uv_width = BW >> mbd->plane[1].subsampling_x;
#if EXPERIMENT_TEMPORAL_FILTER
const int is_screen_content_type = cm->allow_screen_content_tools != 0;
- const int use_new_temporal_mode = AOMMIN(cm->width, cm->height) >= 480 &&
- !is_screen_content_type && !is_key_frame;
+ const int use_new_temporal_mode =
+ !is_screen_content_type && AOMMIN(cm->width, cm->height) >= 480;
#else
(void)sigma;
const int use_new_temporal_mode = 0;
diff --git a/av1/encoder/x86/temporal_filter_avx2.c b/av1/encoder/x86/temporal_filter_avx2.c
index 9cd71ac..09325aa 100644
--- a/av1/encoder/x86/temporal_filter_avx2.c
+++ b/av1/encoder/x86/temporal_filter_avx2.c
@@ -138,8 +138,7 @@
(void)strength;
(void)blk_fw;
(void)use_32x32;
- const double decay = decay_control * exp(1 - sigma);
- const double h = AOMMAX(decay * sigma, 0.1);
+ const double h = decay_control * (0.7 + log(sigma + 0.5));
const double beta = 1.0;
uint16_t frame_sse[SSE_STRIDE * BH];
diff --git a/av1/encoder/x86/temporal_filter_sse2.c b/av1/encoder/x86/temporal_filter_sse2.c
index 07105dd..bc0dd51 100644
--- a/av1/encoder/x86/temporal_filter_sse2.c
+++ b/av1/encoder/x86/temporal_filter_sse2.c
@@ -109,8 +109,7 @@
(void)strength;
(void)blk_fw;
(void)use_32x32;
- const double decay = decay_control * exp(1 - sigma);
- const double h = AOMMAX(decay * sigma, 0.1);
+ const double h = decay_control * (0.7 + log(sigma + 0.5));
const double beta = 1.0;
uint16_t frame_sse[SSE_STRIDE * BH];
