public async void Contours(SoftwareBitmap input, SoftwareBitmap output, Algorithm algorithm)
{
if (algorithm.AlgorithmName == "Contours")
{
using Mat mInput = SoftwareBitmap2Mat(input);
using Mat mOutput = new Mat(mInput.Rows, mInput.Cols, MatType.CV_8UC4);
mInput.CopyTo(mOutput);
using Mat gray = mInput.CvtColor(ColorConversionCodes.BGRA2GRAY);
using Mat edges = gray.Canny((double)algorithm.AlgorithmProperties[6].CurrentValue, (double)algorithm.AlgorithmProperties[7].CurrentValue);
Cv2.FindContours(
image: edges,
contours: out OpenCvSharp.Point[][] contours,
hierarchy: out HierarchyIndex[] outputArray,
mode: (RetrievalModes)algorithm.AlgorithmProperties[0].CurrentValue,
method: (ContourApproximationModes)algorithm.AlgorithmProperties[1].CurrentValue,
offset: (Point)algorithm.AlgorithmProperties[2].CurrentValue);
int maxLen = 0;
int maxIdx = -1;
for (int i = 0; i < contours.Length; i++)
{
if (contours[i].Length > maxLen)
{
maxIdx = i;
maxLen = contours[i].Length;
}
if (contours[i].Length > (int)algorithm.AlgorithmProperties[8].CurrentValue)
{
Cv2.DrawContours(
mOutput,
contours,
contourIdx: i,
color: (Scalar)algorithm.AlgorithmProperties[3].CurrentValue,
thickness: (int)algorithm.AlgorithmProperties[4].CurrentValue,
lineType: (LineTypes)algorithm.AlgorithmProperties[5].CurrentValue,
hierarchy: outputArray,
maxLevel: 0);
}
}
if (maxIdx != -1)
{
var res = Cv2.ApproxPolyDP(contours[maxIdx], 1, true);
//Cv2.DrawContours(
// mOutput,
// contours,
// maxIdx,
// (Scalar)algorithm.algorithmProperties[3].CurrentValue,
// (int)algorithm.algorithmProperties[4].CurrentValue,
// (LineTypes)algorithm.algorithmProperties[5].CurrentValue,
// outputArray,
// 0);
////return Cv2.ContourArea(res);
}
Mat2SoftwareBitmap(mOutput, output);
// Must run on UI thread. The winrt container also needs to be set.
if (App.container != null)
{
await App.container.Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =>
{
Cv2.ImShow("Contours", mOutput);
});
}
}
}