public void GetBlocks(string name, string[] expected)
{
if (name == "90 180 270 rotated.pdf")
{
// The 'TimesNewRomanPSMT' font is used by this particular document. Thus, results cannot be trusted on
// platforms where this font isn't generally available (e.g. OSX, Linux, etc.), so we skip it!
var font = SystemFontFinder.Instance.GetTrueTypeFont("TimesNewRomanPSMT");
Skip.If(font == null, "Skipped because the font TimesNewRomanPSMT could not be found in the execution environment.");
}
var options = new DocstrumBoundingBoxes.DocstrumBoundingBoxesOptions()
{
LineSeparator = " "
};
using (var document = PdfDocument.Open(DlaHelper.GetDocumentPath(name)))
{
var page = document.GetPage(1);
var words = NearestNeighbourWordExtractor.Instance.GetWords(page.Letters);
var blocks = DocstrumBoundingBoxes.Instance.GetBlocks(words, options);
Assert.Equal(expected.Length, blocks.Count);
var orderedBlocks = blocks.OrderBy(b => b.BoundingBox.BottomLeft.X)
.ThenByDescending(b => b.BoundingBox.BottomLeft.Y).ToList();
for (int i = 0; i < orderedBlocks.Count; i++)
{
Assert.Equal(expected[i], orderedBlocks[i].Text);
}
}
}
public void GetBlocks(string name, string[] expected)
{
using (var document = PdfDocument.Open(DlaHelper.GetDocumentPath(name)))
{
var page = document.GetPage(1);
var words = NearestNeighbourWordExtractor.Instance.GetWords(page.Letters);
var options = new RecursiveXYCut.RecursiveXYCutOptions()
{
MinimumWidth = page.Width / 3.0, LineSeparator = " "
};
var blocks = RecursiveXYCut.Instance.GetBlocks(words, options);
Assert.Equal(expected.Length, blocks.Count);
var orderedBlocks = blocks.OrderBy(b => b.BoundingBox.BottomLeft.X)
.ThenByDescending(b => b.BoundingBox.BottomLeft.Y).ToList();
for (int i = 0; i < orderedBlocks.Count; i++)
{
Assert.Equal(expected[i], orderedBlocks[i].Text);
}
}
}
public void GetBlocksStatic(string name, string[] expected)
{
if (name == "90 180 270 rotated.pdf")
{
// The 'TimesNewRomanPSMT' font is used by this particular document. Thus, results cannot be trusted on
// platforms where this font isn't generally available (e.g. OSX, Linux, etc.), so we skip it!
var font = SystemFontFinder.Instance.GetTrueTypeFont("TimesNewRomanPSMT");
Skip.If(font == null, "Skipped because the font TimesNewRomanPSMT could not be found in the execution environment.");
}
var options = new DocstrumBoundingBoxes.DocstrumBoundingBoxesOptions()
{
LineSeparator = " "
};
using (var document = PdfDocument.Open(DlaHelper.GetDocumentPath(name)))
{
var page = document.GetPage(1);
var words = NearestNeighbourWordExtractor.Instance.GetWords(page.Letters).ToList();
// Docstrum using static methods
// Filter out white spaces
words = words.Where(w => !string.IsNullOrWhiteSpace(w.Text)).ToList();
var wlBounds = options.WithinLineBounds;
var wlBinSize = options.WithinLineBinSize;
var wlMultiplier = options.WithinLineMultiplier;
var blBounds = options.BetweenLineBounds;
var blBinSize = options.BetweenLineBinSize;
var blMultiplier = options.BetweenLineMultiplier;
var maxDegreeOfParallelism = options.MaxDegreeOfParallelism;
var angularDifferenceBounds = options.AngularDifferenceBounds;
var wordSeparator = options.WordSeparator;
var lineSeparator = options.LineSeparator;
var epsilon = options.Epsilon;
// 1. Estimate within line and between line spacing
if (!DocstrumBoundingBoxes.GetSpacingEstimation(words, wlBounds, wlBinSize, blBounds, blBinSize,
maxDegreeOfParallelism,
out double withinLineDistance, out double betweenLineDistance))
{
if (double.IsNaN(withinLineDistance))
{
withinLineDistance = 0;
}
if (double.IsNaN(betweenLineDistance))
{
betweenLineDistance = 0;
}
}
// 2. Determination of Text Lines
double maxWithinLineDistance = wlMultiplier * withinLineDistance;
var lines = DocstrumBoundingBoxes.GetLines(words, maxWithinLineDistance, wlBounds, wordSeparator, maxDegreeOfParallelism).ToArray();
// 3. Structural Block Determination
double maxBetweenLineDistance = blMultiplier * betweenLineDistance;
var blocks = DocstrumBoundingBoxes.GetStructuralBlocks(lines, maxBetweenLineDistance, angularDifferenceBounds, epsilon, lineSeparator, maxDegreeOfParallelism).ToList();
Assert.Equal(expected.Length, blocks.Count);
var orderedBlocks = blocks.OrderBy(b => b.BoundingBox.BottomLeft.X)
.ThenByDescending(b => b.BoundingBox.BottomLeft.Y).ToList();
for (int i = 0; i < orderedBlocks.Count; i++)
{
Assert.Equal(expected[i], orderedBlocks[i].Text);
}
}
}
