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Overhauling the thresholds and mixing proportions for mfqe postprocessor.

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Makes the thresholds for the multiframe quality enhancement module
depend on the difference between the base quantizers. Also modifies
the mixing function to weigh the current low quality frame less if
the difference in quantizer is large. With the above modifications
mfqe works well for both scalable patterns as well as low quality
key frames.

Change-Id: If24e94f63f3c292f939eea94f627e7ebfb27cb75
This commit is contained in:
Deb Mukherjee 2012-01-19 19:06:55 -08:00
parent 90b9f993c1
commit 47dcd769c1
1 changed files with 49 additions and 45 deletions
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94
vp8/common/postproc.c
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@ -714,7 +714,7 @@ static void multiframe_quality_enhance_block
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
};
int blksizeby2 = blksize >> 1;
int blksizesq = blksize * blksize;
int qdiff = qcurr - qprev;
int i, j;
unsigned char *yp;
@ -727,27 +727,28 @@ static void multiframe_quality_enhance_block
unsigned int act, sse, sad, thr;
if (blksize == 16)
{
act = vp8_variance_var16x16(y, y_stride, VP8_ZEROS, 0, &sse);
sad = vp8_variance_sad16x16(y, y_stride, yd, yd_stride, 0);
act = (vp8_variance_var16x16(yd, yd_stride, VP8_ZEROS, 0, &sse)+128)>>8;
sad = (vp8_variance_sad16x16(y, y_stride, yd, yd_stride, 0)+128)>>8;
}
else if (blksize == 8)
{
act = vp8_variance_var8x8(y, y_stride, VP8_ZEROS, 0, &sse);
sad = vp8_variance_sad8x8(y, y_stride, yd, yd_stride, 0);
act = (vp8_variance_var8x8(yd, yd_stride, VP8_ZEROS, 0, &sse)+32)>>6;
sad = (vp8_variance_sad8x8(y, y_stride, yd, yd_stride, 0)+32)>>6;
}
else
{
act = vp8_variance_var4x4(y, y_stride, VP8_ZEROS, 0, &sse);
sad = vp8_variance_sad4x4(y, y_stride, yd, yd_stride, 0);
act = (vp8_variance_var4x4(yd, yd_stride, VP8_ZEROS, 0, &sse)+8)>>4;
sad = (vp8_variance_sad4x4(y, y_stride, yd, yd_stride, 0)+8)>>4;
}
thr = 6 * blksizesq + (act >> 3);
if (thr > 12 * blksizesq) thr = 12 * blksizesq;
// These thresholds should be adapted later based on qcurr and qprev
/* thr = qdiff/8 + log2(act) + log4(qprev) */
thr = (qdiff>>3);
while (act>>=1) thr++;
while (qprev>>=2) thr++;
if (sad < thr)
{
static const int roundoff = (1 << (MFQE_PRECISION - 1));
int ifactor = (sad << MFQE_PRECISION) / thr;
ifactor >>= (qdiff >> 5);
// TODO: SIMD optimize this section
if (ifactor)
{
@ -839,41 +840,44 @@ void vp8_multiframe_quality_enhance
if (((frame_type == INTER_FRAME &&
abs(mode_info_context->mbmi.mv.as_mv.row) <= 10 &&
abs(mode_info_context->mbmi.mv.as_mv.col) <= 10) ||
(frame_type == KEY_FRAME)) &&
mode_info_context->mbmi.mode != B_PRED)
(frame_type == KEY_FRAME)))
{
multiframe_quality_enhance_block(16,
qcurr,
qprev,
y_ptr,
u_ptr,
v_ptr,
show->y_stride,
show->uv_stride,
yd_ptr,
ud_ptr,
vd_ptr,
dest->y_stride,
dest->uv_stride);
}
else if (mode_info_context->mbmi.mode == B_PRED)
{
int i, j;
for (i=0; i<2; ++i)
for (j=0; j<2; ++j)
multiframe_quality_enhance_block(8,
qcurr,
qprev,
y_ptr + 8*(i*show->y_stride+j),
u_ptr + 4*(i*show->uv_stride+j),
v_ptr + 4*(i*show->uv_stride+j),
show->y_stride,
show->uv_stride,
yd_ptr + 8*(i*dest->y_stride+j),
ud_ptr + 4*(i*dest->uv_stride+j),
vd_ptr + 4*(i*dest->uv_stride+j),
dest->y_stride,
dest->uv_stride);
if (mode_info_context->mbmi.mode == B_PRED || mode_info_context->mbmi.mode == SPLITMV)
{
int i, j;
for (i=0; i<2; ++i)
for (j=0; j<2; ++j)
multiframe_quality_enhance_block(8,
qcurr,
qprev,
y_ptr + 8*(i*show->y_stride+j),
u_ptr + 4*(i*show->uv_stride+j),
v_ptr + 4*(i*show->uv_stride+j),
show->y_stride,
show->uv_stride,
yd_ptr + 8*(i*dest->y_stride+j),
ud_ptr + 4*(i*dest->uv_stride+j),
vd_ptr + 4*(i*dest->uv_stride+j),
dest->y_stride,
dest->uv_stride);
}
else
{
multiframe_quality_enhance_block(16,
qcurr,
qprev,
y_ptr,
u_ptr,
v_ptr,
show->y_stride,
show->uv_stride,
yd_ptr,
ud_ptr,
vd_ptr,
dest->y_stride,
dest->uv_stride);
}
}
else
{