public void GetDiffFrame(int width, int height, out double[] buf)
{
buf = new double[width * height];
var frame = new Mat();
var diff = new Mat();
var rotatedrect = new RotatedRect();
if (capture.Read(frame))
{
frame = frame.Resize(new Size(width, height));
Cv2.CvtColor(frame, frame, ColorConversionCodes.BGR2GRAY);
if (PrevFrame != null)
{
Cv2.Absdiff(frame, PrevFrame, diff);
double weight = 1;
Mat[] contours;
for (int r = 0; r < 2; r++)
{
Cv2.Threshold(diff, diff, byte.MaxValue / 8, byte.MaxValue, ThresholdTypes.Otsu);
var nonzerocnt = Cv2.CountNonZero(diff);
weight = (0.25 - ((double)nonzerocnt) / (width * height)) / (0.25);
weight = weight < 0 ? 0 : weight;
if (weight > 0.5)
{
Mat h = new Mat();
Cv2.FindContours(diff, out contours, new Mat(), RetrievalModes.External, ContourApproximationModes.ApproxTC89KCOS);
diff = new Mat(new Size(width, height), MatType.CV_8UC1, new Scalar(0));
if (contours.Length > 0)
{
var areaave = contours.Average(x => Cv2.ContourArea(x));
for (int i = 0; i < contours.Length; i++)
{
if (Cv2.ContourArea(contours[i]) > areaave)
{
Cv2.DrawContours(diff, contours, i, new Scalar(byte.MaxValue), -1);
}
}
}
}
else
{
diff = new Mat(new Size(width, height), MatType.CV_8UC1, new Scalar(0));
}
}
Point[][] contourspoint;
HierarchyIndex[] hierarchyIndexes;
Cv2.FindContours(diff.Clone(), out contourspoint, out hierarchyIndexes, RetrievalModes.External, ContourApproximationModes.ApproxTC89KCOS);
if (contourspoint.Length > 0)
{
var points = new List <Point>();
for (int idx_cnt = 0; idx_cnt < contourspoint.GetLength(0); ++idx_cnt)
{
if (hierarchyIndexes[idx_cnt].Parent != -1)
{
continue;
}
points.AddRange(contourspoint[idx_cnt]);
}
if (points.Count > 5)
{
diff = new Mat(new Size(width, height), MatType.CV_8UC1, new Scalar(0));
rotatedrect = Cv2.FitEllipse(points);
float rho = 0.25f;
rotatedrect.Angle = (rho * rotatedrect.Angle + (1 - rho) * PrevRect.Angle);
rotatedrect.Size.Width = (rho * rotatedrect.Size.Width + (1 - rho) * PrevRect.Size.Width);
rotatedrect.Size.Height = (rho * rotatedrect.Size.Height + (1 - rho) * PrevRect.Size.Height);
Cv2.Ellipse(diff, rotatedrect, new Scalar(byte.MaxValue), -1);
}
}
double w = 0.8;
Cv2.AddWeighted(PrevDiffFrame, w, diff, 1 - w, 0, diff);
Mat result = diff.Clone();
//Cv2.Threshold(diff, result, byte.MaxValue / 8, byte.MaxValue, ThresholdTypes.Binary);
Cv2.Dilate(result, result, new Mat(), new Point(-1, -1), 8);
//frame.CopyTo(result, result);
unsafe
{
byte *rslt = (byte *)result.Data;
byte *f = (byte *)frame.Data;
for (int i = 0; i < width * height; i++)
{
double r = (double)rslt[i] / byte.MaxValue;
if (r > 0.25)
{
buf[i] = ((double)f[i] / byte.MaxValue) + 0.25;
}
}
}
}
if (PrevFrame == null)
{
PrevFrame = frame.Clone();
PrevDiffFrame = new Mat(PrevFrame.Size(), PrevFrame.Type(), new Scalar(0));
PrevRect = new RotatedRect();
}
else
{
double weight = 0.5;
Cv2.AddWeighted(PrevFrame, weight, frame, 1 - weight, 0, PrevFrame);
PrevDiffFrame = diff.Clone();
PrevRect = rotatedrect;
}
}
}
public void GetDiffFrame(int width, int height, out double[] buf)
{
buf = new double[width * height];
var frame = new Mat();
var diff = new Mat();
if (capture.Read(frame))
{
frame = frame.Resize(new Size(width, height));
Cv2.CvtColor(frame, frame, ColorConversionCodes.BGR2GRAY);
if (PrevFrame != null)
{
diff = frame.Clone();
Cv2.Absdiff(frame, PrevFrame, diff);
Cv2.Threshold(diff, diff, byte.MaxValue * 0.25, byte.MaxValue, ThresholdTypes.Binary);
Point[][] contours;
HierarchyIndex[] hierarchyIndexes;
Cv2.FindContours(diff.Clone(), out contours, out hierarchyIndexes, RetrievalModes.List, ContourApproximationModes.ApproxTC89KCOS);
if (contours.Length > 0)
{
var points = new List <Point>();
for (int idx_cnt = 0; idx_cnt < contours.GetLength(0); ++idx_cnt)
{
if (hierarchyIndexes[idx_cnt].Parent != -1)
{
continue;
}
points.AddRange(contours[idx_cnt]);
}
Cv2.DrawContours(diff, new List <List <Point> >(new List <Point>[] { new List <Point>(Cv2.ConvexHull(points.ToArray())) }), 0, new Scalar(byte.MaxValue), -1);
}
var masked = diff.Clone();
frame.CopyTo(masked, diff);
Cv2.BitwiseOr(diff, PrevDiffFrame, diff);
Cv2.AddWeighted(masked, 0.5, diff, 0.5, 0, diff);
if (PrevFrame != null)
{
unsafe
{
byte *p = (byte *)frame.Data;
byte *pv = (byte *)diff.Data;
for (int i = 0; i < width * height; i++)
{
buf[i] = (double)pv[i] / byte.MaxValue;
}
}
}
}
if (PrevFrame == null)
{
PrevFrame = frame.Clone();
PrevDiffFrame = new Mat(PrevFrame.Size(), PrevFrame.Type());
}
else
{
double weight = 0.75;
Cv2.AddWeighted(PrevFrame, weight, frame, 1 - weight, 0, PrevFrame);
PrevDiffFrame = diff.Clone();
}
}
}