shithub: libvpx

Download patch

ref: e3f0b19f3f12f5a46d485ea4b767fd2885e72012
parent: e535ad50672e3e9c2c874eec38adbe9dc4e4ed99
author: Jingning Han <jingning@google.com>
date: Wed Jan 7 13:36:47 EST 2015 

Use lookup table to find pixel numbers in block

This could save one multiplication in each threshold funtion
called by the denoiser per block.

Change-Id: I35f437e09999f0a087180878ef7805f0d86e5819


--- a/vp9/encoder/vp9_denoiser.c
+++ b/vp9/encoder/vp9_denoiser.c
@@ -49,9 +49,7 @@
 }
 
 static unsigned int sse_thresh(BLOCK_SIZE bs, int increase_denoising) {
-  return (4 << b_width_log2_lookup[bs]) *
-         (4 << b_height_log2_lookup[bs]) *
-         (increase_denoising ? 60 : 40);
+  return (1 << num_pels_log2_lookup[bs]) * (increase_denoising ? 60 : 40);
 }
 
 static int sse_diff_thresh(BLOCK_SIZE bs, int increase_denoising,
@@ -60,19 +58,16 @@
       noise_motion_thresh(bs, increase_denoising)) {
     return 0;
   } else {
-    return (4 << b_width_log2_lookup[bs]) *
-           (4 << b_height_log2_lookup[bs]) * 20;
+    return (1 << num_pels_log2_lookup[bs]) * 20;
   }
 }
 
 int total_adj_strong_thresh(BLOCK_SIZE bs, int increase_denoising) {
-  return (4 << b_width_log2_lookup[bs]) *
-         (4 << b_height_log2_lookup[bs]) * (increase_denoising ? 3 : 2);
+  return (1 << num_pels_log2_lookup[bs]) * (increase_denoising ? 3 : 2);
 }
 
 static int total_adj_weak_thresh(BLOCK_SIZE bs, int increase_denoising) {
-  return (4 << b_width_log2_lookup[bs]) *
-         (4 << b_height_log2_lookup[bs]) * (increase_denoising ? 3 : 2);
+  return (1 << num_pels_log2_lookup[bs]) * (increase_denoising ? 3 : 2);
 }
 
 // TODO(jackychen): If increase_denoising is enabled in the future,