/// <summary>
/// Get the words using options values.
/// </summary>
/// <param name="letters">The page's letters to group into <see cref="Word"/>s.</param>
/// <param name="options">The <see cref="NearestNeighbourWordExtractorOptions"/> to use.</param>
/// <returns>The <see cref="Word"/>s generated by the nearest neighbour method.</returns>
public IEnumerable <Word> GetWords(IReadOnlyList <Letter> letters, DlaOptions options)
{
if (options is NearestNeighbourWordExtractorOptions nnOptions)
{
if (letters == null || letters.Count == 0)
{
return(EmptyArray <Word> .Instance);
}
if (nnOptions.GroupByOrientation)
{
// axis aligned
List <Word> words = GetWords(
letters.Where(l => l.TextOrientation == TextOrientation.Horizontal).ToList(),
nnOptions.MaximumDistance, nnOptions.DistanceMeasureAA, nnOptions.FilterPivot,
nnOptions.Filter, nnOptions.MaxDegreeOfParallelism);
words.AddRange(GetWords(
letters.Where(l => l.TextOrientation == TextOrientation.Rotate270).ToList(),
nnOptions.MaximumDistance, nnOptions.DistanceMeasureAA, nnOptions.FilterPivot,
nnOptions.Filter, nnOptions.MaxDegreeOfParallelism));
words.AddRange(GetWords(
letters.Where(l => l.TextOrientation == TextOrientation.Rotate180).ToList(),
nnOptions.MaximumDistance, nnOptions.DistanceMeasureAA, nnOptions.FilterPivot,
nnOptions.Filter, nnOptions.MaxDegreeOfParallelism));
words.AddRange(GetWords(
letters.Where(l => l.TextOrientation == TextOrientation.Rotate90).ToList(),
nnOptions.MaximumDistance, nnOptions.DistanceMeasureAA, nnOptions.FilterPivot,
nnOptions.Filter, nnOptions.MaxDegreeOfParallelism));
// not axis aligned
words.AddRange(GetWords(
letters.Where(l => l.TextOrientation == TextOrientation.Other).ToList(),
nnOptions.MaximumDistance, nnOptions.DistanceMeasure, nnOptions.FilterPivot,
nnOptions.Filter, nnOptions.MaxDegreeOfParallelism));
return(words);
}
else
{
return(GetWords(letters,
nnOptions.MaximumDistance, nnOptions.DistanceMeasure, nnOptions.FilterPivot,
nnOptions.Filter, nnOptions.MaxDegreeOfParallelism));
}
}
else
{
throw new ArgumentException("Options provided must be of type " + nameof(NearestNeighbourWordExtractorOptions) + ".", nameof(options));
}
}
/// <summary>
/// Get the text blocks using options.
/// </summary>
/// <param name="words">The page's words to generate text blocks for.</param>
/// <param name="options">The <see cref="DefaultPageSegmenterOptions"/> to use.</param>
/// <returns>The <see cref="TextBlock"/>s generated by the default method.</returns>
public IReadOnlyList <TextBlock> GetBlocks(IEnumerable <Word> words, DlaOptions options)
{
if (options is DefaultPageSegmenterOptions dOptions)
{
if (words?.Any() != true)
{
return(EmptyArray <TextBlock> .Instance);
}
return(new List <TextBlock>()
{
new TextBlock(new XYLeaf(words).GetLines(dOptions.WordSeparator), dOptions.LineSeparator)
});
}
else
{
throw new ArgumentException("Options provided must be of type " + nameof(DefaultPageSegmenterOptions) + ".", nameof(options));
}
}
/// <summary>
/// Get the blocks using options values.
/// </summary>
/// <param name="words">The page's words to segment into <see cref="TextBlock"/>s.</param>
/// <param name="options">The <see cref="RecursiveXYCutOptions"/> to use.</param>
/// <returns>The <see cref="TextBlock"/>s generated by the Recursive X-Y cut method.</returns>
public IReadOnlyList <TextBlock> GetBlocks(IEnumerable <Word> words, DlaOptions options)
{
if (options is RecursiveXYCutOptions ryxcOptions)
{
if (words?.Any() != true)
{
return(EmptyArray <TextBlock> .Instance);
}
return(GetBlocks(words,
ryxcOptions.MinimumWidth,
ryxcOptions.DominantFontWidthFunc,
ryxcOptions.DominantFontHeightFunc,
ryxcOptions.WordSeparator,
ryxcOptions.LineSeparator));
}
else
{
throw new ArgumentException("Options provided must be of type " + nameof(RecursiveXYCutOptions) + ".", nameof(options));
}
}
/// <summary>
/// Get the blocks using options values.
/// </summary>
/// <param name="words">The page's words to segment into <see cref="TextBlock"/>s.</param>
/// <param name="options">The <see cref="DocstrumBoundingBoxesOptions"/> to use.</param>
/// <returns>The <see cref="TextBlock"/>s generated by the document spectrum method.</returns>
public IReadOnlyList <TextBlock> GetBlocks(IEnumerable <Word> words, DlaOptions options)
{
if (options is DocstrumBoundingBoxesOptions dbbOptions)
{
if (words?.Any() != true)
{
return(EmptyArray <TextBlock> .Instance);
}
return(GetBlocks(words.ToList(),
dbbOptions.WithinLineBounds, dbbOptions.WithinLineMultiplier, dbbOptions.WithinLineBinSize,
dbbOptions.BetweenLineBounds, dbbOptions.BetweenLineMultiplier, dbbOptions.BetweenLineBinSize,
dbbOptions.AngularDifferenceBounds,
dbbOptions.Epsilon,
dbbOptions.WordSeparator, dbbOptions.LineSeparator,
dbbOptions.MaxDegreeOfParallelism));
}
else
{
throw new ArgumentException("Options provided must be of type " + nameof(DocstrumBoundingBoxesOptions) + ".", nameof(options));
}
}
