shithub: libvpx

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ref: c3d6da666ec2564611d1fac0759a8a453726ec9a
parent: 11bf7ea354cb69755e1f0e1a71351b166ae30677
author: Marco <[email protected]>
date: Thu Mar 10 10:43:42 EST 2016 

vp9: Update to skin detection.

For model=1, use higher threshold on luminance, conditioned
on the skin cluster distance.

Change-Id: I971bccdef7b92b2aeef60af90a8e48b98716a89b


--- a/vp9/encoder/vp9_skin_detection.c
+++ b/vp9/encoder/vp9_skin_detection.c
@@ -62,16 +62,16 @@
       // Exit on very strong cb.
       if (cb > 150 && cr < 110)
         return 0;
-      // Exit on (another) low luminance threshold if either color is high.
-      if (y < 50 && (cb > 140 || cr > 140))
-        return 0;
       for (; i < 5; i++) {
-        if (evaluate_skin_color_difference(cb, cr, i) < skin_threshold[i + 1]) {
-          return 1;
+        int skin_color_diff = evaluate_skin_color_difference(cb, cr, i);
+        if (skin_color_diff < skin_threshold[i + 1]) {
+           if (y < 60 && skin_color_diff > 3 * (skin_threshold[i + 1] >> 2))
+             return 0;
+           else
+            return 1;
         }
         // Exit if difference is much large than the threshold.
-        if (evaluate_skin_color_difference(cb, cr, i) >
-            (skin_threshold[i + 1] << 3)) {
+        if (skin_color_diff > (skin_threshold[i + 1] << 3)) {
           return 0;
         }
       }