private static Tuple <String, List <Circle> > DetectExamCode(Bitmap img, List <Rect> horizontalFlgRects, List <Rect> verticalFlgRects)
{
string examId = "";
List <Circle> lstCircles = new List <Circle>();
Circle c;
bool found;
for (int i = 1; i < 4; i++)
{
found = false;
for (int j = 1; j < 11; j++)
{
Rect r1 = horizontalFlgRects[i];
Rect r2 = verticalFlgRects[j];
Point c1 = r1.GetCenterPoint();
Point c2 = r2.GetCenterPoint();
c = new Circle(new Point(c1.x, c2.y), Constant.DEFAULT_CIRCLE_RADIUS);
int nOfBlackInCircle = CommonImageProcessing.CountNumberOfBlackPixelInCircle(img, c, -5);
if (nOfBlackInCircle >= Constant.NUMBER_OF_CIRCLE_BLACK_PIXEL_TO_BE_CONSIDERED_INFO_AS_CHOOSEN)
{
if (found)
{
examId = "-";
}
else
{
found = true;
if (examId != "-")
{
examId = (j - 1).ToString() + examId;
}
}
lstCircles.Add(c);
}
}
if (!found)
{
examId = examId + "*";
}
}
return(new Tuple <string, List <Circle> >(examId, lstCircles));
}
private static Tuple <List <Char>, List <Circle>, List <Point> > DetectStudentAnswer(Bitmap img, List <Rect> horizontalFlgRects, List <Rect> verticalFlgRects)
{
int numberOfQuestion = Globals.numberOfQuestion;
List <Char> answers = new List <Char>();
List <Circle> lstCircles = new List <Circle>();
List <Point> borderPoints = new List <Point>();
for (int i = 0; i < numberOfQuestion + 1; i++)
{
answers.Add('*');
borderPoints.Add(new Point(-100, -100));
}
int nHorizontalRect = horizontalFlgRects.Count;
int nVerticalRect = verticalFlgRects.Count;
Char currentAns = 'A';
int currentQuestion;
int colStartQuestion = 1;
int numberOfRow = (nVerticalRect - 12);
Circle c;
for (int i = nHorizontalRect - 1; i >= 1; i--)
{
currentQuestion = colStartQuestion;
for (int j = 11; j < nVerticalRect - 1; j++)
{
if (currentQuestion > numberOfQuestion)
{
break;
}
Rect r1 = horizontalFlgRects[i];
Rect r2 = verticalFlgRects[j];
Point c1 = r1.GetCenterPoint();
Point c2 = r2.GetCenterPoint();
if (currentAns == 'A')
{
borderPoints[currentQuestion] = new Point(c1.x, c2.y);
}
c = new Circle(new Point(c1.x, c2.y), Constant.DEFAULT_CIRCLE_RADIUS);
int nOfBlackInCircle = CommonImageProcessing.CountNumberOfBlackPixelInCircle(img, c, 8);
if (nOfBlackInCircle >= Constant.NUMBER_OF_CIRCLE_BLACK_PIXEL_TO_BE_CONSIDERED_ANSWER_AS_CHOOSEN)
{
if (answers[currentQuestion] == '*')
{
answers[currentQuestion] = currentAns;
}
else
{
answers[currentQuestion] = '-';
}
lstCircles.Add(c);
}
currentQuestion++;
if (currentQuestion > numberOfQuestion)
{
break;
}
}
if (currentAns == 'E')
{
currentAns = 'A';
colStartQuestion += numberOfRow;
}
else
{
currentAns++;
}
}
return(new Tuple <List <char>, List <Circle>, List <Point> >(answers, lstCircles, borderPoints));
}