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| author | JackyChen <jackychen@google.com> | 2015-11-12 18:36:17 -0800 |
|---|---|---|
| committer | JackyChen <jackychen@google.com> | 2015-11-12 23:41:42 -0800 |
| commit | 6fb3d6db9936ac45f21d90d6b35cfeae2f5071fe (patch) | |
| tree | 06d39e1aac5e61e620234c7044f806e47b7a55f1 /vp9/encoder/vp9_noise_estimate.c | |
| parent | 866c9357c22b9b29d5913fa85720ba74fc89b178 (diff) | |
| download | libvpx-6fb3d6db9936ac45f21d90d6b35cfeae2f5071fe.tar.gz | |
VP9 noise estimation: add frame level motion metrics and adjust thresholds.
Change-Id: Ia1aba00603b32cee6835951d3d8f740937cf20f4
Diffstat (limited to 'vp9/encoder/vp9_noise_estimate.c')
| -rw-r--r-- | vp9/encoder/vp9_noise_estimate.c | 19 |
1 files changed, 16 insertions, 3 deletions
diff --git a/vp9/encoder/vp9_noise_estimate.c b/vp9/encoder/vp9_noise_estimate.c index ddf081c86..c3a3171d6 100644 --- a/vp9/encoder/vp9_noise_estimate.c +++ b/vp9/encoder/vp9_noise_estimate.c @@ -88,7 +88,7 @@ void vp9_update_noise_estimate(VP9_COMP *const cpi) { // Estimate of noise level every frame_period frames. int frame_period = 10; int thresh_consec_zeromv = 8; - unsigned int thresh_sum_diff = 128; + unsigned int thresh_sum_diff = 100; unsigned int thresh_sum_spatial = (200 * 200) << 8; unsigned int thresh_spatial_var = (32 * 32) << 8; int num_frames_estimate = 20; @@ -135,6 +135,17 @@ void vp9_update_noise_estimate(VP9_COMP *const cpi) { const int uv_width_shift = y_width_shift >> 1; const int uv_height_shift = y_height_shift >> 1; int mi_row, mi_col; + int num_low_motion = 0; + int frame_low_motion = 1; + 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; + if (cr->consec_zero_mv[bl_index] > thresh_consec_zeromv) + num_low_motion++; + } + } + if (num_low_motion < ((3 * cm->mi_rows * cm->mi_cols) >> 3)) + frame_low_motion = 0; for (mi_row = 0; mi_row < cm->mi_rows; mi_row++) { for (mi_col = 0; mi_col < cm->mi_cols; mi_col++) { // 16x16 blocks, 1/4 sample of frame. @@ -154,7 +165,8 @@ void vp9_update_noise_estimate(VP9_COMP *const cpi) { const uint8_t vsource = src_v[uv_height_shift * src_uvstride + uv_width_shift]; int is_skin = vp9_skin_pixel(ysource, usource, vsource); - if (cr->consec_zero_mv[bl_index] > thresh_consec_zeromv && + if (frame_low_motion && + cr->consec_zero_mv[bl_index] > thresh_consec_zeromv && cr->consec_zero_mv[bl_index1] > thresh_consec_zeromv && cr->consec_zero_mv[bl_index2] > thresh_consec_zeromv && cr->consec_zero_mv[bl_index3] > thresh_consec_zeromv && @@ -202,10 +214,11 @@ void vp9_update_noise_estimate(VP9_COMP *const cpi) { // Normalize. avg_est = avg_est / num_samples; // Update noise estimate. - ne->value = (int)((3 * ne->value + avg_est) >> 2); + ne->value = (int)((15 * ne->value + avg_est) >> 4); ne->count++; if (ne->count == num_frames_estimate) { // Reset counter and check noise level condition. + num_frames_estimate = 40; ne->count = 0; if (ne->value > (ne->thresh << 1)) ne->level = kHigh; |