/// <summary>
/// Feed each character of a paragraph to a recognizer.
/// </summary>
/// <param name="paragraph"></param>
/// <returns></returns>
public string RecognizeParagraph(Paragraph paragraph)
{
string result = "";
foreach (Line line in paragraph.lines)
{
foreach (Word word in line.words)
{
foreach (Character character in word.characters)
{
Image resized = ImageHelper.ResizeImage(character.image, ImageHelper.RecommendedSize, ImageHelper.RecommendedSize);
Image resized_mono = ImageHelper.ThresholdAndConvertTo1bpp(resized);
//Classification classification = RecognizeImageWithBoolArrayMethod(resized_mono);
//Classification classification = RecognizeSuperimposedImageWithHausdorffMethod(resized_mono);
//Classification classification = RecognizeSuperimposedImageWithBoolArrayMethod(resized_mono);
Classification classification = RecognizeSuperimposedAndEnhancedImageWithBoolArrayMethod(resized_mono);
if(classification == Classification.Eight) //Handle special case where 3 and 8 can be confused by RecognizeSuperimposedAndEnhancedImageWithBoolArrayMethod().
{
Classification newClassification = RecognizeImageWithBoolArrayMethod(resized_mono);
Classification newClassification2 = RecognizeSuperimposedImageWithHausdorffMethod(resized_mono);
if (newClassification == newClassification2)
classification = newClassification;
}
result += ClassificationToString(classification);
}
result += " ";
}
result += "\n";
}
return result;
}
/// <summary>
/// Preprocesses a scanned image to be recognized.
/// Operations performed: thresholding, noise removal, line segmentation, word segmentation and character segmentation.
/// </summary>
/// <param name="oriImage">Original image to be processed.</param>
/// <returns></returns>
public static Paragraph PreprocessScannedImage(Image oriImage)
{
Paragraph paragraph = new Paragraph();
Image bpp = ThresholdAndConvertTo1bpp(oriImage);
Image bppRgb = Convert1bppTo24bpp(bpp);
Image noised = RemoveNoise(bppRgb);
List<Image> lines_img = LineSegmentation(noised);
foreach (Image line in lines_img)
{
Line line_class = new Line();
List<Image> words_img = WordSegmentation(line);
foreach (Image word in words_img)
{
Word word_class = new Word();
List<Image> characters_img = CharacterSegmentation(word);
foreach (Image character in characters_img)
{
Character character_class = new Character();
character_class.image = character;
word_class.characters.Add(character_class);
}
line_class.words.Add(word_class);
}
paragraph.lines.Add(line_class);
}
return paragraph;
}
