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vp9: Increase convergence speed of noise estimation.

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Increase the recursive average factor from 15/16 to 3/4
to make the noise estimation respond faster.

Small/neglible change on low noise content, but better
denoising for noisy content.
Also encoder speedup of ~2-3% observed on some noisy clips.

Change-Id: I9dd02fe961ca24b411fe4c2732f814bf1e9a7f9f
This commit is contained in:
Marco
2018-01-04 14:20:59 -08:00
parent 8a4336ed2e
commit 55db4f033f
1 changed files with 1 additions and 1 deletions
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2
vp9/encoder/vp9_noise_estimate.c
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@@ -258,7 +258,7 @@ void vp9_update_noise_estimate(VP9_COMP *const cpi) {
// Normalize.
avg_est = avg_est / num_samples;
// Update noise estimate.
ne->value = (int)((15 * ne->value + avg_est) >> 4);
ne->value = (int)((3 * ne->value + avg_est) >> 2);
ne->count++;
if (ne->count == ne->num_frames_estimate) {
// Reset counter and check noise level condition.