/// <summary>
/// Returns a <see cref="System.String"/> that represents the current <see cref="ZXing.PDF417.Internal.DetectionResult"/>.
/// </summary>
/// <returns>A <see cref="System.String"/> that represents the current <see cref="ZXing.PDF417.Internal.DetectionResult"/>.</returns>
public override string ToString()
{
StringBuilder formatter = new StringBuilder();
DetectionResultColumn rowIndicatorColumn = DetectionResultColumns[0];
if (rowIndicatorColumn == null)
{
rowIndicatorColumn = DetectionResultColumns[ColumnCount + 1];
}
for (int codewordsRow = 0; codewordsRow < rowIndicatorColumn.Codewords.Length; codewordsRow++)
{
formatter.AppendFormat(CultureInfo.InvariantCulture, "CW {0,3}:", codewordsRow);
for (int barcodeColumn = 0; barcodeColumn < ColumnCount + 2; barcodeColumn++)
{
if (DetectionResultColumns[barcodeColumn] == null)
{
formatter.Append(" | ");
continue;
}
Codeword codeword = DetectionResultColumns[barcodeColumn].Codewords[codewordsRow];
if (codeword == null)
{
formatter.Append(" | ");
continue;
}
formatter.AppendFormat(CultureInfo.InvariantCulture, " {0,3}|{1,3}", codeword.RowNumber, codeword.Value);
}
formatter.Append("\n");
}
return(formatter.ToString());
}
public DetectionResult(BarcodeMetadata metadata, BoundingBox box)
{
Metadata = metadata;
Box = box;
ColumnCount = metadata.ColumnCount;
DetectionResultColumns = new DetectionResultColumn[ColumnCount + 2];
}
/// <summary>
/// Adjusts the indicator column row numbers.
/// </summary>
/// <param name="detectionResultColumn">Detection result column.</param>
private void adjustIndicatorColumnRowNumbers(DetectionResultColumn detectionResultColumn)
{
if (detectionResultColumn != null)
{
((DetectionResultRowIndicatorColumn)detectionResultColumn)
.adjustCompleteIndicatorColumnRowNumbers(Metadata);
}
}
/// <summary>
/// Decode the specified image, imageTopLeft, imageBottomLeft, imageTopRight, imageBottomRight, minCodewordWidth
/// and maxCodewordWidth.
/// TODO: don't pass in minCodewordWidth and maxCodewordWidth, pass in barcode columns for start and stop pattern
/// columns. That way width can be deducted from the pattern column.
/// This approach also allows to detect more details about the barcode, e.g. if a bar type (white or black) is wider
/// than it should be. This can happen if the scanner used a bad blackpoint.
/// </summary>
/// <param name="image">Image.</param>
/// <param name="imageTopLeft">Image top left.</param>
/// <param name="imageBottomLeft">Image bottom left.</param>
/// <param name="imageTopRight">Image top right.</param>
/// <param name="imageBottomRight">Image bottom right.</param>
/// <param name="minCodewordWidth">Minimum codeword width.</param>
/// <param name="maxCodewordWidth">Max codeword width.</param>
public static DecoderResult decode(BitMatrix image,
ResultPoint imageTopLeft,
ResultPoint imageBottomLeft,
ResultPoint imageTopRight,
ResultPoint imageBottomRight,
int minCodewordWidth,
int maxCodewordWidth)
{
BoundingBox boundingBox = BoundingBox.Create(image, imageTopLeft, imageBottomLeft, imageTopRight, imageBottomRight);
if (boundingBox == null)
{
return(null);
}
DetectionResultRowIndicatorColumn leftRowIndicatorColumn = null;
DetectionResultRowIndicatorColumn rightRowIndicatorColumn = null;
DetectionResult detectionResult = null;
for (int i = 0; i < 2; i++)
{
if (imageTopLeft != null)
{
leftRowIndicatorColumn = getRowIndicatorColumn(image, boundingBox, imageTopLeft, true, minCodewordWidth, maxCodewordWidth);
}
if (imageTopRight != null)
{
rightRowIndicatorColumn = getRowIndicatorColumn(image, boundingBox, imageTopRight, false, minCodewordWidth, maxCodewordWidth);
}
detectionResult = merge(leftRowIndicatorColumn, rightRowIndicatorColumn);
if (detectionResult == null)
{
// TODO Based on Owen's Comments in <see cref="ZXing.ReaderException"/>, this method has been modified to continue silently
// if a barcode was not decoded where it was detected instead of throwing a new exception object.
return(null);
}
if (i == 0 && detectionResult.Box != null &&
(detectionResult.Box.MinY < boundingBox.MinY || detectionResult.Box.MaxY > boundingBox.MaxY))
{
boundingBox = detectionResult.Box;
}
else
{
detectionResult.Box = boundingBox;
break;
}
}
int maxBarcodeColumn = detectionResult.ColumnCount + 1;
detectionResult.DetectionResultColumns[0] = leftRowIndicatorColumn;
detectionResult.DetectionResultColumns[maxBarcodeColumn] = rightRowIndicatorColumn;
bool leftToRight = leftRowIndicatorColumn != null;
for (int barcodeColumnCount = 1; barcodeColumnCount <= maxBarcodeColumn; barcodeColumnCount++)
{
int barcodeColumn = leftToRight ? barcodeColumnCount : maxBarcodeColumn - barcodeColumnCount;
if (detectionResult.DetectionResultColumns[barcodeColumn] != null)
{
// This will be the case for the opposite row indicator column, which doesn't need to be decoded again.
continue;
}
DetectionResultColumn detectionResultColumn;
if (barcodeColumn == 0 || barcodeColumn == maxBarcodeColumn)
{
detectionResultColumn = new DetectionResultRowIndicatorColumn(boundingBox, barcodeColumn == 0);
}
else
{
detectionResultColumn = new DetectionResultColumn(boundingBox);
}
detectionResult.DetectionResultColumns[barcodeColumn] = detectionResultColumn;
int startColumn = -1;
int previousStartColumn = startColumn;
// TODO start at a row for which we know the start position, then detect upwards and downwards from there.
for (int imageRow = boundingBox.MinY; imageRow <= boundingBox.MaxY; imageRow++)
{
startColumn = getStartColumn(detectionResult, barcodeColumn, imageRow, leftToRight);
if (startColumn < 0 || startColumn > boundingBox.MaxX)
{
if (previousStartColumn == -1)
{
continue;
}
startColumn = previousStartColumn;
}
Codeword codeword = detectCodeword(image, boundingBox.MinX, boundingBox.MaxX, leftToRight,
startColumn, imageRow, minCodewordWidth, maxCodewordWidth);
if (codeword != null)
{
detectionResultColumn.setCodeword(imageRow, codeword);
previousStartColumn = startColumn;
minCodewordWidth = Math.Min(minCodewordWidth, codeword.Width);
maxCodewordWidth = Math.Max(maxCodewordWidth, codeword.Width);
}
}
}
return(createDecoderResult(detectionResult));
}
