public static Mat GetRectangle(Point[] point)
{
VectorOfPoint vt = new VectorOfPoint(point);
Mat face = vt.GetInputArray().GetMat();
return(face);
}
private void btStep4_Click(object sender, EventArgs e)
{
Mat thresh = new Mat();
CvInvoke.Threshold(cropped, thresh, 0, 255, ThresholdType.BinaryInv | ThresholdType.Otsu);
VectorOfVectorOfPoint contours = new VectorOfVectorOfPoint();
Mat hierarchy = new Mat();
CvInvoke.FindContours(thresh.Clone(), contours, hierarchy, RetrType.External, ChainApproxMethod.ChainApproxSimple);
CvInvoke.DrawContours(cropped, contours, -1, new MCvScalar(0), 2);
imageResult.Image = cropped;
List <Point[]> questionContours = new List <Point[]>();
for (int i = 0; i < contours.Size; i++)
{
VectorOfPoint contour = contours[i];
Rectangle bounding = CvInvoke.BoundingRectangle(contour.GetInputArray().GetMat());
double ratio = bounding.Width / bounding.Height;
if (bounding.Width >= 20 && bounding.Height >= 20 && ratio >= 0.95 && ratio <= 1.05)
{
questionContours.Add(contour.ToArray());
CvInvoke.Rectangle(thresh, bounding, new MCvScalar(255, 0, 0), 1);
}
}
questionContours.Sort(new Comparison <Point[]>((a, b) =>
{
if (a[0].X > b[0].X)
{
return(1);
}
else if (a[0].X < b[0].X)
{
return(-1);
}
return(0);
}));
answerSheet = new List <List <AnswerCell> >();
int xError = 5;
int currentX = questionContours[0][0].X;
int currentGroup = 0;
answerSheet.Add(new List <AnswerCell>());
for (int i = 1; i < questionContours.Count; i++)
{
if (Math.Abs(questionContours[i][0].X - currentX) < xError)
{
VectorOfPoint contour = new VectorOfPoint(questionContours[i]);
Rectangle bounding = CvInvoke.BoundingRectangle(contour.GetInputArray().GetMat());
Mat croppedBubble = new Mat(thresh, bounding);
//Add to current column
answerSheet[currentGroup].Add(new AnswerCell()
{
Contour = questionContours[i], Marked = CvInvoke.CountNonZero(croppedBubble)
});
}
else
{
//Sort current column
answerSheet[currentGroup].Sort(new Comparison <AnswerCell>((a, b) =>
{
if (a.Contour[0].Y > b.Contour[0].Y)
{
return(1);
}
else if (a.Contour[0].Y < b.Contour[0].Y)
{
return(-1);
}
return(0);
}));
currentX = questionContours[i][0].X;
currentGroup++;
//Create new column
answerSheet.Add(new List <AnswerCell>());
}
}
imageResult.Image = thresh;
}