Read 100 Question OMR Sheet and Show result

Question

Hello All,
I got a Project from:
http://www.codeproject.com/Articles/451169/Csharp-Optical-Marks-Recognition-OMR-Engine-1-0?msg=4386396#xx4386396xx
thanks to umar.techBOY.
I changed it to my requirment as 100 Questions with 4 Options in A4 size Paper.
Its working fine as far as read registration is concern.
The problem with the read Answer Function.
The code for reading Answer are as follows:
private void button7_Click(object sender, EventArgs e)
//ContrastCorrection cc = new ContrastCorrection();
//panel1.BackgroundImage = cc.Apply((Bitmap)panel1.BackgroundImage);
panel1.Invalidate(); Application.DoEvents();
showTimeStamp("Slicing Started");
Rectangle[] Blocks = new Rectangle[]
OMRSheetReader.GetSheetPropertyLocation("sheets", OMREnums.OMRSheet.A450, OMREnums.OMRProperty.tensBlock1),
OMRSheetReader.GetSheetPropertyLocation("sheets", OMREnums.OMRSheet.A450, OMREnums.OMRProperty.tensBlock2),
OMRSheetReader.GetSheetPropertyLocation("sheets", OMREnums.OMRSheet.A450, OMREnums.OMRProperty.tensBlock3),
OMRSheetReader.GetSheetPropertyLocation("sheets", OMREnums.OMRSheet.A450, OMREnums.OMRProperty.tensBlock4)
List<Bitmap[]> bmps = new List<Bitmap[]>();
for (int i = 0; i < 4; i++)
bmps.Add(SliceOMarkBlock(panel1.BackgroundImage, Blocks[i], 25));
showTimeStamp("Slicing ended");
string ans = "";
foreach (Bitmap[] blk in bmps)
foreach (Bitmap line in blk)
ans += rateSlice(line,25) + ",";
ans += "\r\n";
panel1.Invalidate();
Application.DoEvents();
MessageBox.Show(ans);
private int rateSlice(Bitmap slice, int OMCount)
Rectangle[] cropRects = new Rectangle[OMCount];
Bitmap[] marks = new Bitmap[OMCount];
for (int i = 0; i < OMCount; i++)
cropRects[i] = new Rectangle(i * slice.Width / OMCount, 0, slice.Width / OMCount, slice.Height);
int crsr = 0;
foreach (Rectangle cropRect in cropRects)
Bitmap target = new Bitmap(cropRect.Width, cropRect.Height);
using (Graphics g = Graphics.FromImage(target))
g.DrawImage(slice, new Rectangle(0, 0, target.Width, target.Height),
cropRect,
GraphicsUnit.Pixel);
marks[crsr] = target;
crsr++;
long maxPD = (slice.Width / OMCount) * slice.Height * 255;
List<long> inks = new List<long>();
List<long> fullInks = new List<long>();
foreach (Bitmap mark in marks)
inks.Add(InkDarkness(mark));
fullInks.Add(inks[inks.Count - 1]);
int indofMx = -1,indofMn = -1;
long maxD = 0, minD = 0; ;
for (int i = 0; i < OMCount; i++)
if (inks[i] > maxD)
maxD = inks[i];
indofMx = i;
minD = maxD;
for (int i = 0; i < OMCount; i++)
if (inks[i] < minD)
minD = inks[i];
indofMn = i;
for (int i = 0; i < OMCount; i++)
inks[i] -= minD - 1;
bool parallelExist = false, spe = false, tpe = false, fpe = false;
for (int i = 0; i < OMCount; i++)
if (i != indofMx)
if ((double)fullInks[indofMx] / fullInks[i] <= 2)
if (tpe) fpe = true;
if (spe) tpe = true;
if (parallelExist) spe = true;
parallelExist = true;
int negScore = parallelExist ? -1 : 0;
negScore = spe ? -2 : negScore;
negScore = tpe ? -3 : negScore;
negScore = fpe ? -4 : negScore;
if (!parallelExist)
return indofMx + 1;
bool atleastOneUnfilled = false;
for (int i = 0; i < OMCount; i++)
if (i != indofMx)
if ((double)fullInks[indofMx] / fullInks[i] >= 3)
atleastOneUnfilled = true;
if (atleastOneUnfilled)
return negScore;
return 0;
private long InkDarkness(Bitmap OMark)
int darkestC = 255, lightestC = 0;
UnmanagedImage mark = UnmanagedImage.FromManagedImage(OMark);
for (int y = 0; y < OMark.Height; y++)
for (int x = 0; x < OMark.Width; x++)
Color c = mark.GetPixel(x, y);
if (((c.R + c.G + c.B) / 3) > lightestC)
lightestC = ((c.R + c.G + c.B) / 3);
if (((c.R + c.G + c.B) / 3) < darkestC)
darkestC = ((c.R + c.G + c.B) / 3);
int dc = 0;
for (int y = 0; y < OMark.Height; y++)
for (int x = 0; x < OMark.Width; x++)
Color c = mark.GetPixel(x, y);
if (((c.R + c.G + c.B) / 3) < (lightestC + darkestC) / 2)
{ dc += 255; }
return dc;
private Bitmap[] SliceOMarkBlock(System.Drawing.Image fullSheet, Rectangle slicer, int slices)
List<Rectangle> cropRects = new List<Rectangle>();
Bitmap[] bmps = new Bitmap[slices];
for (int i = 0; i < slices; i++)
cropRects.Add(new Rectangle(slicer.X, slicer.Y + (slicer.Height / slices) * i, slicer.Width, slicer.Height/slices));
Bitmap src = (Bitmap)fullSheet;
int crsr = 0;
foreach (Rectangle cropRect in cropRects)
Bitmap target = new Bitmap(cropRect.Width, cropRect.Height);
using (Graphics g = Graphics.FromImage(target))
g.DrawImage(src, new Rectangle(0, 0, target.Width, target.Height),
cropRect,
GraphicsUnit.Pixel);
bmps[crsr] = target;
crsr++;
return bmps;
throw new Exception("Couldn't slice");
Its Showing result like ---> -2,-3,-2,-4,-4,-4 and so on up to 100 Questions
is there any one Help me for this.

Answer 1

It looks like you've already engaged the author on the CodeProject site and they have attempted to help you.  It would be best to finish the discussion there.  I'll move this to the C# forums (since it is C# code) but it may get moved again to
Off-Topic since the issue revolves around this particular CodeProject article (and since the author has already attempted to help).
Reed Kimble - "When you do things right, people won't be sure you've done anything at all"