shithub: libvpx

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vp9: Adjust some thresholds for noise estimation.

Adjust thresholds for noise estimation, for resolutions above VGA.
Tends to push cleaner/low noise clips to LowLow state.

No change in RTC metrics.

Change-Id: I739ca6b797d0a60ccd1c6c6a2775269b1f007e5e

--- a/vp9/encoder/vp9_noise_estimate.c

+++ b/vp9/encoder/vp9_noise_estimate.c

@@ -32,7 +32,7 @@

   if (width * height >= 1920 * 1080) {

     ne->thresh = 200;

   } else if (width * height >= 1280 * 720) {

-    ne->thresh = 140;

+    ne->thresh = 150;

   } else if (width * height >= 640 * 360) {

     ne->thresh = 100;

   }

@@ -114,6 +114,13 @@

   if (cpi->oxcf.noise_sensitivity > 0 && denoise_svc(cpi))

     last_source = &cpi->denoiser.last_source;

 #endif

+  // Tune these thresholds for different resolutions.

+  if (cm->width > 640 && cm->width < 1920) {

+    thresh_consec_zeromv = 5;

+    thresh_sum_diff = 200;

+    thresh_sum_spatial = (120 * 120) << 8;

+    thresh_spatial_var = (48 * 48) << 8;

+  }

   ne->enabled = enable_noise_estimation(cpi);

   if (cpi->svc.number_spatial_layers > 1)

     frame_counter = cpi->svc.current_superframe;

@@ -130,7 +137,8 @@

       ne->last_h = cm->height;

     }

     return;

-  } else if (cpi->rc.avg_frame_low_motion < (low_res ? 70 : 50)) {

+  } else if (cm->current_video_frame > 60 &&

+             cpi->rc.avg_frame_low_motion < (low_res ? 70 : 50)) {

     // Force noise estimation to 0 and denoiser off if content has high motion.

     ne->level = kLowLow;

 #if CONFIG_VP9_TEMPORAL_DENOISING