int createLevels(const int fh, const int fw)
{
std::vector<device::Level> vlevels;
float logFactor = (::log(maxScale) - ::log(minScale)) / (totals -1);
float scale = minScale;
int dcs = 0;
for (int sc = 0; sc < totals; ++sc)
{
int width = (int)::std::max(0.0f, fw - (origObjWidth * scale));
int height = (int)::std::max(0.0f, fh - (origObjHeight * scale));
float logScale = ::log(scale);
int fit = fitOctave(voctaves, logScale);
device::Level level(fit, voctaves[fit], scale, width, height);
if (!width || !height)
break;
else
{
vlevels.push_back(level);
if (voctaves[fit].scale < 1) ++dcs;
}
if (::fabs(scale - maxScale) < FLT_EPSILON) break;
scale = ::std::min(maxScale, ::expf(::log(scale) + logFactor));
}
cv::Mat hlevels = cv::Mat(1, (int) (vlevels.size() * sizeof(device::Level)), CV_8UC1, (uchar*)&(vlevels[0]) );
CV_Assert(!hlevels.empty());
levels.upload(hlevels);
downscales = dcs;
return dcs;
}
// compute levels of full pyramid
void calcLevels(const cv::Size& curr, float mins, float maxs, int total)
{
if (frameSize == curr && maxs == maxScale && mins == minScale && total == scales) return;
frameSize = curr;
maxScale = maxs; minScale = mins; scales = total;
CV_Assert(scales > 1);
levels.clear();
float logFactor = (log(maxScale) - log(minScale)) / (scales -1);
float scale = minScale;
for (int sc = 0; sc < scales; ++sc)
{
int width = static_cast<int>(std::max(0.0f, frameSize.width - (origObjWidth * scale)));
int height = static_cast<int>(std::max(0.0f, frameSize.height - (origObjHeight * scale)));
float logScale = log(scale);
octIt_t fit = fitOctave(logScale);
Level level(*fit, scale, shrinkage, width, height);
if (!width || !height)
break;
else
levels.push_back(level);
if (fabs(scale - maxScale) < FLT_EPSILON) break;
scale = std::min(maxScale, expf(log(scale) + logFactor));
}
}
