void FillRhombMask(View & mask, const Rect & rect, uint8_t index)
{
assert(mask.format == View::Gray8 && Rect(mask.Size()).Contains(rect));
Simd::Fill(mask, 0);
Point c = rect.Center();
for(ptrdiff_t row = rect.top; row < rect.bottom; ++row)
{
ptrdiff_t indent = std::abs(row - c.y)*rect.Width()/rect.Height();
ptrdiff_t left = rect.left + indent;
ptrdiff_t right = rect.right - indent;
ptrdiff_t offset = row*mask.stride + left;
for(ptrdiff_t col = left; col < right; ++col, ++offset)
mask.data[offset] = Random(2) ? index : 0;
}
}
/*!
Estimates shift of current image relative to background image.
\param [in] current - current image.
\param [in] region - a region at the background where the algorithm start to search current image. Estimated shift is taken relative of the region.
\param [in] maxShift - a 2D-point which characterizes maximal possible shift of the region (along X and Y axes).
\param [in] hiddenAreaPenalty - a parameter used to restrict searching of the shift at the border of background image.
\param [in] regionAreaMin - a parameter used to set minimal area of region use for shift estimation. By default is equal to 25.
\return a result of shift estimation.
*/
bool Estimate(const View & current, const Rect & region, const Point & maxShift, double hiddenAreaPenalty = 0, ptrdiff_t regionAreaMin = REGION_CORRELATION_AREA_MIN)
{
assert(current.Size() == region.Size() && region.Area() > 0);
assert(_current.Size() && _current[0].width >= current.width && _current[0].height >= current.height);
if (region.Area() < regionAreaMin)
return false;
InitLevels(region, maxShift, regionAreaMin);
SetCurrent(current, region);
Point shift;
for (ptrdiff_t i = _levels.size() - 1; i >= 0; i--)
{
shift.x *= 2;
shift.y *= 2;
if (!SearchLocalMin(_levels[i], shift, hiddenAreaPenalty))
return false;
shift = _levels[i].shift;
}
return true;
}
