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Changing default 8-tap filter to Langrangian interpolator.

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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:
http://www.corp.google.com/~debargha/vp8_results/enhinterpn.html (derf)
http://www.corp.google.com/~debargha/vp8_results/enhinterpn_hd.html (HD)

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
This commit is contained in:
Deb Mukherjee 2012-02-24 09:08:00 -08:00
parent 583f2d8fc7
commit c64a27801c
1 changed files with 65 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

102
vp8/common/filter.c
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@ -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 */
};