Example #1
0
        public static Mat GetRectangle(Point[] point)
        {
            VectorOfPoint vt   = new VectorOfPoint(point);
            Mat           face = vt.GetInputArray().GetMat();

            return(face);
        }
Example #2
0
        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;
        }