private Bitmap PrepImage(Bitmap image)
{
float useWidthPercent = (float)nud_width.Value % 101;
Int32 useWidth = (Int32)((float)image.Width * (useWidthPercent / 100));
return(Bitmapper.Crop(image, (image.Width - useWidth) / 2, (image.Height / 2) - (Barcode.rowsToAverage / 2), useWidth, Barcode.rowsToAverage));
}
/// <summary>
/// Attempts to create a barcode out of an image
/// </summary>
/// <param name="Image">Image to read</param>
/// <exception cref="BarcodeException">No valid barcode found in image.</exception>
public Barcode(Bitmap image)
{
if (image.Height < Barcode.rowsToAverage)
{
throw new BarcodeException("Image to short.");
}
DecodeImage(image);
this.originalImage = (Bitmap)Bitmapper.Copy(image);
}
/// <summary>
/// Requests and attempts to read an image for a barcode
/// </summary>
private void imgCap()
{
if (!run)
{
return;
}
// Do allow multiple reads at the same time from timer interrupts
if (mu.WaitOne(1))
{
try
{
Bitmap curBarCode = (Bitmap)cam.AcquireImage();
pb_barcode.Image = Bitmapper.Resize(curBarCode, pb_barcode.Width, pb_barcode.Height);
curBarCode = PrepImage(curBarCode);
Bitmap temp = new Bitmap(curBarCode);
Bitmapper.ThresholdImage(temp, Barcode.threshold);
temp = (Bitmap)Bitmapper.Resize(temp, pb_barcode.Width, temp.Height);
pb_threshold.Image = temp;
if (curBarCode != null)
{
Barcode code = new Barcode(curBarCode);
if (code.uncertainty > (Int32)nud_uncertainty.Value)
{
throw new BarcodeException("Uncertainty to high:" + code.uncertainty);
}
DisplayBarcode(code.barcode);
lastBarcode = code;
lb_uncertainty.Text = code.uncertainty.ToString();
stop();
}
}
catch (Exception ex)
{
tb_errors.Text = ex.Message;
}
finally
{
mu.ReleaseMutex();
}
}
}
/// <summary>
/// Attempts to read a barcode out of an image
/// </summary>
/// <param name="Image">Image to read</param>
/// <returns>barcode</returns>
private void DecodeImage(Bitmap Image)
{
this.barcode = "";
Bitmapper.ThresholdImage(Image, threshold);
Double[] lineWidth = new Double[59];
Int32 startRow = (Image.Height / 2) - (rowsToAverage / 2);
for (int i = 0; i < rowsToAverage; ++i)
{
// Read in a single line
Int32[] row = ReadLine(Image, startRow + i);
Int32 offset = -1;
Int32 currentColor = row[0];
Int32 rowWidth = 0;
for (int j = 0; j < row.Length; ++j)
{
if (row[j] == currentColor)
{
++rowWidth;
continue;
}
else
{
if (offset == -1)
{
++offset;
currentColor = row[j];
rowWidth = 1;
}
else
{
currentColor = row[j];
lineWidth[offset] += rowWidth;
rowWidth = 1;
++offset;
if (offset == lineWidth.Length)
{
break;
}
}
}
}
}
//Average out reads
for (Int32 i = 0; i < lineWidth.Length; ++i)
{
lineWidth[i] /= rowsToAverage;
}
//scale line thicknesses
Double thickness = (lineWidth[0] + lineWidth[1] + lineWidth[2]) / 3;
for (Int32 i = 0; i < lineWidth.Length; ++i)
{
//This part is important gotta get scaling of the line thicknesses right.
if (lineWidth[i] < thickness * 1.5)
{
lineWidth[i] = 1;
}
else if (lineWidth[i] < thickness * 2.5)
{
lineWidth[i] = 2;
}
else if (lineWidth[i] < thickness * 3.5)
{
lineWidth[i] = 3;
}
else
{
lineWidth[i] = 4;
}
}
DecodeThicknesses(lineWidth);
if (ValidateBarCode(barcode) == false)
{
throw new BarcodeException("Checksum fail: " + barcode);
}
}
