private bool PlusCondition(Mat tempROI)
{
bool flag = false;
Cv2.Threshold(tempROI, tempROI, 200, 255, ThresholdTypes.BinaryInv); //反向二值化
var tempContours = new OpenCvSharp.Point[][] { };
var tempHierarchy = new OpenCvSharp.HierarchyIndex[] { };
Cv2.FindContours(tempROI, out tempContours, out tempHierarchy, RetrievalModes.Tree, ContourApproximationModes.ApproxNone);
//对于每一个tempROI，对于箭头 或者 判断是否符合条件
if (tempContours.GetLength(0) == 4)
{
var pointListX = new List <double>();//4个轮廓中心点
var pointListY = new List <double>();
var euDisList = new List <double>();
double sumX = 0, sumY = 0;
for (int i = 0; i < 4; i++)
{
var M = Cv2.Moments(tempContours[i]);
if (M.M00 != 0)
{
var cx = (M.M10 / M.M00);
var cy = (M.M01 / M.M00);
pointListX.Add(cx);
pointListY.Add(cy);
sumX += cx;
sumY += cy;
}
else
{
return(false);
}
}
var centerPointX = sumX / 4;
var centerPointY = sumY / 4;
for (int i = 0; i < 4; i++)
{
euDisList.Add(Math.Pow(Math.Pow(Math.Abs(centerPointX - pointListX[i]), 2) + Math.Pow(Math.Abs(centerPointY - pointListY[i]), 2), 0.5));
}
var stdDev = CalculateStdDev(euDisList);
if (stdDev < 0.12)
{
flag = true;
// Console.WriteLine(stdDev);
}
}
return(flag);
}
private List <Rect> ConditionNMS(Mat binaryImg, ref List <int> orientationList)
{
var rectList = new List <Rect>();
var indexer = binaryImg.GetGenericIndexer <Vec3b>();
var contours = new OpenCvSharp.Point[][] { };
var hierarchy = new OpenCvSharp.HierarchyIndex[] { };
var contourAreaList = new List <double>()
{
};
var contourCenterList = new List <System.Drawing.Point>()
{
};
Cv2.FindContours(binaryImg, out contours, out hierarchy, RetrievalModes.External, ContourApproximationModes.ApproxNone);
for (int i = 0; i < hierarchy.Length; i++)
{
var M = Cv2.Moments(contours[i]);
if (M.M00 != 0)
{
var cx = (int)(M.M10 / M.M00);
var cy = (int)(M.M01 / M.M00);
if (indexer[cy, cx].Item0 == 255)
{
var rect = Cv2.BoundingRect(contours[i]);
if (indexer[rect.Y, rect.X].Item0 == 0 && indexer[rect.Y + rect.Height, rect.X + rect.Width].Item0 == 0 &&
indexer[rect.Y + rect.Height, rect.X].Item0 == 0 && indexer[rect.Y, rect.X + rect.Width].Item0 == 0 &&
rect.Width / rect.Height > 4 && rect.Width > 40)
{
//Rect r = new Rect(new OpenCvSharp.Point(rect.X, rect.Y), new OpenCvSharp.Size(rect.Width, rect.Height));
//Cv2.Rectangle(binaryImg, r, Scalar.LimeGreen, 1);
//Cv2.DrawContours(srcImg, contours, i, Scalar.Gray, 2, LineTypes.Link8, hierarchy, 4);
var point1 = new OpenCvSharp.Point(cx, cy);
Cv2.FloodFill(binaryImg, point1, new Scalar(155, 155, 155));
var tempROI = new Mat();
binaryImg[rect].CopyTo(tempROI);//截出连通域, 按中心点做漫水填充
int orientation = 0;
///////////////
Vec3b color = new Vec3b(0, 0, 0);
int sLeft = 0, sRight = 0;
var ROIIndexer = tempROI.GetGenericIndexer <Vec3b>();
for (int k = 0; k < tempROI.Rows; k++)
{
for (int j = 0; j < tempROI.Cols; j++)
{
if (ROIIndexer[k, j].Item0 == 255)
{
ROIIndexer[k, j] = color;
continue;
}
else if (ROIIndexer[k, j].Item0 == 155)
{
if (j < tempROI.Cols / 2)
{
sLeft++;
}
else
{
sRight++;
}
}
}
}
Cv2.Threshold(tempROI, tempROI, 154, 255, ThresholdTypes.BinaryInv);
if (sLeft < sRight)
{
orientation = 1; //正向箭头
}
//////////////////
var tempContours = new OpenCvSharp.Point[][] { };
var tempHierarchy = new OpenCvSharp.HierarchyIndex[] { };
Cv2.FindContours(tempROI, out tempContours, out tempHierarchy, RetrievalModes.Tree, ContourApproximationModes.ApproxNone);
if (tempContours.GetLength(0) == 4 && Math.Abs(sLeft - sRight) > 10)
{
rectList.Add(rect);
orientationList.Add(orientation);
}
}
}
}
}
return(rectList);
}