// copy from src/layer/proposal.cpp
private static Mat GenerateAnchors(int baseSize, Mat ratios, Mat scales)
{
var numRatio = ratios.W;
var numScale = scales.W;
var anchors = new Mat();
anchors.Create(4, numRatio * numScale);
var cx = baseSize * 0.5f;
var cy = baseSize * 0.5f;
for (var i = 0; i < numRatio; i++)
{
var ar = ratios[i];
var rW = (int)Math.Round(baseSize / Math.Sqrt(ar));
var rH = (int)Math.Round(rW * ar); //round(baseSize * sqrt(ar));
for (var j = 0; j < numScale; j++)
{
var scale = scales[j];
var rsW = rW * scale;
var rsH = rH * scale;
var anchor = anchors.Row(i * numScale + j);
anchor[0] = cx - rsW * 0.5f;
anchor[1] = cy - rsH * 0.5f;
anchor[2] = cx + rsW * 0.5f;
anchor[3] = cy + rsH * 0.5f;
}
}
return(anchors);
}