Add a new intra prediction mode "smooth".
This is added as part of ALT_INTRA experiment.
This uses interpolation between top row and estimated bottom row; as
well as left column and estimated right column to generate the
predicted block.The interpolation is done using a predefined weight
array.
Based on experiments, the currently chosen weight array was created
to represent a quadratic curve, but can be tuned further if needed.
Improvement from baseline on Derf set:
ALL Keyframes: 1.279%
Improvement from existing ALT_INTRA:
ALL Keyframes: 1.146%
Change-Id: I12637fa1b91bd836f1c59b27d6caee2004acbdd4
diff --git a/av1/encoder/rdopt.c b/av1/encoder/rdopt.c
index b15b88a..b765d8c 100644
--- a/av1/encoder/rdopt.c
+++ b/av1/encoder/rdopt.c
@@ -224,6 +224,10 @@
{ TM_PRED, { INTRA_FRAME, NONE } },
+#if CONFIG_ALT_INTRA
+ { SMOOTH_PRED, { INTRA_FRAME, NONE } },
+#endif // CONFIG_ALT_INTRA
+
#if CONFIG_EXT_INTER
{ NEAR_NEARESTMV, { LAST_FRAME, ALTREF_FRAME } },
{ NEAREST_NEARMV, { LAST_FRAME, ALTREF_FRAME } },
