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some restructuring of resize algorithm code

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This commit is contained in:
Ilya Lavrenov
2012-09-21 18:17:54 +04:00
parent 222303f24b
commit b7b32e74a5
2 changed files with 33 additions and 96 deletions
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127
modules/imgproc/src/imgwarp.cpp
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@@ -1405,25 +1405,29 @@ public:
resizeArea_Invoker(const Mat& _src, Mat& _dst, const DecimateAlpha* _xofs,
int _xofs_count, double _scale_y_
#ifdef HAVE_TBB
, const int* _yofs, const int* _cur_dy_ofs
, const int* _cur_dy_ofs, const std::vector<std::pair<int, int> >& _bands
#endif
) :
ParallelLoopBody(), src(_src), dst(_dst), xofs(_xofs),
xofs_count(_xofs_count), scale_y_(_scale_y_)
#ifdef HAVE_TBB
, yofs(_yofs), cur_dy_ofs(_cur_dy_ofs)
, cur_dy_ofs(_cur_dy_ofs), bands(_bands)
#endif
{
}
#ifdef HAVE_TBB
void resize_signle_band(const Range& range) const
#else
virtual void operator() (const Range& range) const
#endif
{
Size ssize = src.size(), dsize = dst.size();
int cn = src.channels();
dsize.width *= cn;
AutoBuffer<WT> _buffer(dsize.width*2);
WT *buf = _buffer, *sum = buf + dsize.width;
int k = -1000, sy = -1000, dx = -1000, cur_dy = -1000;
int k = 0, sy = 0, dx = 0, cur_dy = 0;
WT scale_y = (WT)scale_y_;
CV_Assert( cn <= 4 );
@@ -1431,90 +1435,8 @@ public:
buf[dx] = sum[dx] = 0;
#ifdef HAVE_TBB
sy = yofs[range.start];
cur_dy = cur_dy_ofs[sy];
for ( ; sy < range.start; sy++ )
{
const T* S = (const T*)(src.data + src.step*sy);
if( cn == 1 )
for( k = 0; k < xofs_count; k++ )
{
int dxn = xofs[k].di;
WT alpha = xofs[k].alpha;
buf[dxn] += S[xofs[k].si]*alpha;
}
else if( cn == 2 )
for( k = 0; k < xofs_count; k++ )
{
int sxn = xofs[k].si;
int dxn = xofs[k].di;
WT alpha = xofs[k].alpha;
WT t0 = buf[dxn] + S[sxn]*alpha;
WT t1 = buf[dxn+1] + S[sxn+1]*alpha;
buf[dxn] = t0; buf[dxn+1] = t1;
}
else if( cn == 3 )
for( k = 0; k < xofs_count; k++ )
{
int sxn = xofs[k].si;
int dxn = xofs[k].di;
WT alpha = xofs[k].alpha;
WT t0 = buf[dxn] + S[sxn]*alpha;
WT t1 = buf[dxn+1] + S[sxn+1]*alpha;
WT t2 = buf[dxn+2] + S[sxn+2]*alpha;
buf[dxn] = t0; buf[dxn+1] = t1; buf[dxn+2] = t2;
}
else
for( k = 0; k < xofs_count; k++ )
{
int sxn = xofs[k].si;
int dxn = xofs[k].di;
WT alpha = xofs[k].alpha;
WT t0 = buf[dxn] + S[sxn]*alpha;
WT t1 = buf[dxn+1] + S[sxn+1]*alpha;
buf[dxn] = t0; buf[dxn+1] = t1;
t0 = buf[dxn+2] + S[sxn+2]*alpha;
t1 = buf[dxn+3] + S[sxn+3]*alpha;
buf[dxn+2] = t0; buf[dxn+3] = t1;
}
if( (cur_dy + 1)*scale_y <= sy + 1 || sy == ssize.height - 1 )
{
WT beta = std::max(sy + 1 - (cur_dy+1)*scale_y, (WT)0);
if( fabs(beta) < 1e-3 )
{
if(cur_dy >= dsize.height)
break;
for( dx = 0; dx < dsize.width; dx++ )
sum[dx] = buf[dx] = 0;
}
else
for( dx = 0; dx < dsize.width; dx++ )
{
sum[dx] = buf[dx]*beta;
buf[dx] = 0;
}
cur_dy++;
}
else
{
for( dx = 0; dx <= dsize.width - 2; dx += 2 )
{
WT t0 = sum[dx] + buf[dx];
WT t1 = sum[dx+1] + buf[dx+1];
sum[dx] = t0; sum[dx+1] = t1;
buf[dx] = buf[dx+1] = 0;
}
for( ; dx < dsize.width; dx++ )
{
sum[dx] += buf[dx];
buf[dx] = 0;
}
}
}
cur_dy = cur_dy_ofs[range.start];
#endif
for( sy = range.start; sy < range.end; sy++ )
{
const T* S = (const T*)(src.data + src.step*sy);
@@ -1602,6 +1524,17 @@ public:
}
}
#ifdef HAVE_TBB
virtual void operator() (const Range& range) const
{
for (int i = range.start; i < range.end; ++i)
{
Range band_range(bands[i].first, bands[i].second);
resize_signle_band(band_range);
}
}
#endif
private:
const Mat src;
Mat dst;
@@ -1609,7 +1542,8 @@ private:
const int xofs_count;
const double scale_y_;
#ifdef HAVE_TBB
const int *yofs, *cur_dy_ofs;
const int *cur_dy_ofs;
std::vector<std::pair<int, int> > bands;
#endif
resizeArea_Invoker(const resizeArea_Invoker&);
resizeArea_Invoker& operator=(const resizeArea_Invoker&);
@@ -1620,9 +1554,10 @@ static void resizeArea_( const Mat& src, Mat& dst, const DecimateAlpha* xofs, in
{
#ifdef HAVE_TBB
Size ssize = src.size(), dsize = dst.size();
AutoBuffer<int> _yofs(2 * ssize.height);
int *yofs = _yofs, *cur_dy_ofs = _yofs + ssize.height;
int index = 0, cur_dy = 0;
AutoBuffer<int> _yofs(ssize.height);
int *cur_dy_ofs = _yofs;
int cur_dy = 0, index = 0;
std::vector<std::pair<int, int> > bands;
// cur_dy_ofs - dy for the current sy
// yofs - a starting row for calculating a band according to the current sy
@@ -1630,7 +1565,6 @@ static void resizeArea_( const Mat& src, Mat& dst, const DecimateAlpha* xofs, in
for (int sy = 0; sy < ssize.height; sy++)
{
cur_dy_ofs[sy] = cur_dy;
yofs[sy] = index;
if ((cur_dy + 1) * scale_y_ <= sy + 1 || sy == ssize.height - 1 )
{
@@ -1639,19 +1573,22 @@ static void resizeArea_( const Mat& src, Mat& dst, const DecimateAlpha* xofs, in
{
if (cur_dy >= dsize.height)
break;
bands.push_back(std::make_pair(index, sy + 1));
index = sy + 1;
}
cur_dy++;
}
}
bands.push_back(std::make_pair(index, ssize.height));
#endif
Range range(0, src.rows);
resizeArea_Invoker<T, WT> invoker(src, dst, xofs, xofs_count, scale_y_
#ifdef HAVE_TBB
, yofs, cur_dy_ofs
Range range(0, bands.size());
resizeArea_Invoker<T, WT> invoker(src, dst, xofs, xofs_count, scale_y_, cur_dy_ofs, bands);
#else
Range range(0, src.rows);
resizeArea_Invoker<T, WT> invoker(src, dst, xofs, xofs_count, scale_y_);
#endif
);
parallel_for_(range, invoker);
}

2
modules/imgproc/test/test_imgwarp.cpp
View File

@@ -1501,7 +1501,6 @@ TEST(Imgproc_resize_area, regression)
Mat diff;
absdiff(actual, expected, diff);
std::cout << "Abs diff:" << std::endl << diff << std::endl;
Mat one_channel_diff = diff; //.reshape(1);
@@ -1523,6 +1522,7 @@ TEST(Imgproc_resize_area, regression)
int rmin = MAX(dy - radius, 0), rmax = MIN(dy + radius, dsize.height);
int cmin = MAX(dx - radius, 0), cmax = MIN(dx + radius, dsize.width);
std::cout << "Abs diff:" << std::endl << diff << std::endl;
std::cout << "actual result:\n" << actual(Range(rmin, rmax), Range(cmin, cmax)) << std::endl;
std::cout << "expected result:\n" << expected(Range(rmin, rmax), Range(cmin, cmax)) << std::endl;