Commit c64a2780 by Deb Mukherjee

### Changing default 8-tap filter to Langrangian interpolator.

The Lagrangian interpolation filter is maximally flat in the
passband. There is non-trivial improvement with the hd set, while
for derf the results are virtually unchanged.
See:

Patch 2: Updated the results for derf in the html above to use the
new baseline. There is still about 4% improvement. Will update the
hd baseline later (since it takes 9 hours to run on my machine)

Patch 3: By mistake the default filter was left at 60 - should be 0
to use the new interpolation filter.

Change-Id: If5f64444976562415d68a2aeabb94fdfa0d47890
parent 583f2d8f
 ... ... @@ -45,7 +45,7 @@ DECLARE_ALIGNED(16, const short, vp8_bilinear_filters[SUBPEL_SHIFTS][2]) = }; #if CONFIG_ENHANCED_INTERP #define FILTER_ALPHA 60 #define FILTER_ALPHA 0 DECLARE_ALIGNED(16, const short, vp8_sub_pel_filters[SUBPEL_SHIFTS][2*INTERP_EXTEND]) = { /* Generated using MATLAB: ... ... @@ -56,25 +56,7 @@ DECLARE_ALIGNED(16, const short, vp8_sub_pel_filters[SUBPEL_SHIFTS][2*INTERP_EXT * disp(num2str(ba, '%d,')) */ #if SUBPEL_SHIFTS==16 #if FILTER_ALPHA == 75 /* alpha = 0.75 */ { 0, 0, 0, 128, 0, 0, 0, 0}, {-1, 2, -6, 126, 9, -3, 2, -1}, {-1, 4, -11, 123, 18, -7, 3, -1}, {-2, 6, -16, 119, 28, -10, 5, -2}, {-2, 7, -19, 113, 38, -13, 6, -2}, {-3, 8, -21, 106, 49, -16, 7, -2}, {-3, 9, -22, 99, 59, -19, 8, -3}, {-3, 9, -23, 90, 70, -21, 9, -3}, {-3, 9, -22, 80, 80, -22, 9, -3}, {-3, 9, -21, 70, 90, -23, 9, -3}, {-3, 8, -19, 59, 99, -22, 9, -3}, {-2, 7, -16, 49, 106, -21, 8, -3}, {-2, 6, -13, 38, 113, -19, 7, -2}, {-2, 5, -10, 28, 119, -16, 6, -2}, {-1, 3, -7, 18, 123, -11, 4, -1}, {-1, 2, -3, 9, 126, -6, 2, -1} #elif FILTER_ALPHA == 70 #if FILTER_ALPHA == 70 /* alpha = 0.70 */ { 0, 0, 0, 128, 0, 0, 0, 0}, { 0, 2, -6, 126, 8, -3, 1, 0}, ... ... @@ -109,7 +91,7 @@ DECLARE_ALIGNED(16, const short, vp8_sub_pel_filters[SUBPEL_SHIFTS][2*INTERP_EXT {-1, 5, -13, 38, 112, -17, 5, -1}, {-1, 4, -10, 27, 118, -14, 5, -1}, {-1, 2, -6, 18, 123, -10, 3, -1}, {0, 1, -3, 8, 126, -6, 2, 0} { 0, 1, -3, 8, 126, -6, 2, 0} #elif FILTER_ALPHA == 60 /* alpha = 0.60 */ { 0, 0, 0, 128, 0, 0, 0, 0}, ... ... @@ -127,11 +109,11 @@ DECLARE_ALIGNED(16, const short, vp8_sub_pel_filters[SUBPEL_SHIFTS][2*INTERP_EXT {-1, 4, -12, 38, 112, -17, 5, -1}, {-1, 3, -9, 28, 118, -14, 4, -1}, {-1, 2, -6, 18, 123, -10, 3, -1}, {0, 1, -3, 8, 126, -6, 2, 0} { 0, 1, -3, 8, 126, -6, 2, 0} #elif FILTER_ALPHA == 55 /* alpha = 0.55 */ {0, 0, 0, 128, 0, 0, 0, 0}, {0, 1, -5, 126, 8, -3, 1, 0}, { 0, 0, 0, 128, 0, 0, 0, 0}, { 0, 1, -5, 126, 8, -3, 1, 0}, {-1, 2, -10, 123, 18, -6, 2, 0}, {-1, 4, -13, 118, 27, -9, 3, -1}, {-1, 5, -16, 112, 37, -12, 4, -1}, ... ... @@ -144,21 +126,47 @@ DECLARE_ALIGNED(16, const short, vp8_sub_pel_filters[SUBPEL_SHIFTS][2*INTERP_EXT {-1, 4, -14, 48, 105, -18, 5, -1}, {-1, 4, -12, 37, 112, -16, 5, -1}, {-1, 3, -9, 27, 118, -13, 4, -1}, {0, 2, -6, 18, 123, -10, 2, -1}, {0, 1, -3, 8, 126, -5, 1, 0} { 0, 2, -6, 18, 123, -10, 2, -1}, { 0, 1, -3, 8, 126, -5, 1, 0} #elif FILTER_ALPHA == 50 /* alpha = 0.50 */ { 0, 0, 0, 128, 0, 0, 0, 0}, { 0, 1, -5, 126, 8, -3, 1, 0}, { 0, 2, -10, 122, 18, -6, 2, 0}, {-1, 3, -13, 118, 27, -9, 3, 0}, {-1, 4, -16, 112, 37, -11, 3, 0}, {-1, 5, -17, 104, 48, -14, 4, -1}, {-1, 5, -18, 96, 58, -16, 5, -1}, {-1, 5, -19, 88, 68, -17, 5, -1}, {-1, 5, -18, 78, 78, -18, 5, -1}, {-1, 5, -17, 68, 88, -19, 5, -1}, {-1, 5, -16, 58, 96, -18, 5, -1}, {-1, 4, -14, 48, 104, -17, 5, -1}, { 0, 3, -11, 37, 112, -16, 4, -1}, { 0, 3, -9, 27, 118, -13, 3, -1}, { 0, 2, -6, 18, 122, -10, 2, 0}, { 0, 1, -3, 8, 126, -5, 1, 0} #elif FILTER_ALPHA == 0 /* Lagrangian interpolation filter */ { 0, 0, 0, 128, 0, 0, 0, 0}, { 0, 1, -5, 126, 8, -3, 1, 0}, {-1, 3, -10, 122, 18, -6, 2, 0}, {-1, 4, -13, 118, 27, -9, 3, -1}, {-1, 4, -16, 112, 37, -11, 4, -1}, {-1, 5, -18, 105, 48, -14, 4, -1}, {-1, 5, -19, 97, 58, -16, 5, -1}, {-1, 6, -19, 88, 68, -18, 5, -1}, {-1, 6, -19, 78, 78, -19, 6, -1}, {-1, 5, -18, 68, 88, -19, 6, -1}, {-1, 5, -16, 58, 97, -19, 5, -1}, {-1, 4, -14, 48, 105, -18, 5, -1}, {-1, 4, -11, 37, 112, -16, 4, -1}, {-1, 3, -9, 27, 118, -13, 4, -1}, { 0, 2, -6, 18, 122, -10, 3, -1}, { 0, 1, -3, 8, 126, -5, 1, 0} #endif /* FILTER_ALPHA */ #else /* SUBPEL_SHIFTS==16 */ #if FILTER_ALPHA == 75 /* alpha = 0.75 */ { 0, 0, 0, 128, 0, 0, 0, 0}, {-1, 4, -11, 123, 18, -7, 3, -1}, {-2, 7, -19, 113, 38, -13, 6, -2}, {-3, 9, -22, 99, 59, -19, 8, -3}, {-3, 9, -22, 80, 80, -22, 9, -3}, {-3, 8, -19, 59, 99, -22, 9, -3}, {-2, 6, -13, 38, 113, -19, 7, -2}, {-1, 3, -7, 18, 123, -11, 4, -1} #elif FILTER_ALPHA == 70 #if FILTER_ALPHA == 70 /* alpha = 0.70 */ { 0, 0, 0, 128, 0, 0, 0, 0}, {-1, 4, -11, 123, 18, -7, 3, -1}, ... ... @@ -198,6 +206,26 @@ DECLARE_ALIGNED(16, const short, vp8_sub_pel_filters[SUBPEL_SHIFTS][2*INTERP_EXT {-1, 5, -16, 58, 97, -19, 5, -1}, {-1, 4, -12, 37, 112, -16, 5, -1}, { 0, 2, -6, 18, 123, -10, 2, -1} #elif FILTER_ALPHA == 50 /* alpha = 0.50 */ { 0, 0, 0, 128, 0, 0, 0, 0}, { 0, 2, -10, 122, 18, -6, 2, 0}, {-1, 4, -16, 112, 37, -11, 3, 0}, {-1, 5, -18, 96, 58, -16, 5, -1}, {-1, 5, -18, 78, 78, -18, 5, -1}, {-1, 5, -16, 58, 96, -18, 5, -1}, { 0, 3, -11, 37, 112, -16, 4, -1}, { 0, 2, -6, 18, 122, -10, 2, 0} #elif FILTER_ALPHA == 0 /* Lagrangian interpolation filter */ { 0, 0, 0, 128, 0, 0, 0, 0}, {-1, 3, -10, 122, 18, -6, 2, 0}, {-1, 4, -16, 112, 37, -11, 4, -1}, {-1, 5, -19, 97, 58, -16, 5, -1}, {-1, 6, -19, 78, 78, -19, 6, -1}, {-1, 5, -16, 58, 97, -19, 5, -1}, {-1, 4, -11, 37, 112, -16, 4, -1}, { 0, 2, -6, 18, 122, -10, 3, -1}, #endif /* FILTER_ALPHA */ #endif /* SUBPEL_SHIFTS==16 */ }; ... ...
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