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Some minor improvements to the OCR'ing (image resize for tesseract if first hit is bad)

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Tesseract now has "Try modi for unknown words" disabled as it almost never is better than Tesseract!


git-svn-id: https://subtitleedit.googlecode.com/svn/trunk@112 99eadd0c-20b8-1223-b5c4-2a2b2df33de2
This commit is contained in:
niksedk 2010-10-29 21:25:06 +00:00
parent 1441b8ca05
commit b6d5e0b970
3 changed files with 69 additions and 21 deletions
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2
src/Forms/VobSubOcr.Designer.cs generated
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@ -255,8 +255,6 @@ namespace Nikse.SubtitleEdit.Forms
// checkBoxUseModiInTesseractForUnknownWords
//
this.checkBoxUseModiInTesseractForUnknownWords.AutoSize = true;
this.checkBoxUseModiInTesseractForUnknownWords.Checked = true;
this.checkBoxUseModiInTesseractForUnknownWords.CheckState = System.Windows.Forms.CheckState.Checked;
this.checkBoxUseModiInTesseractForUnknownWords.Location = new System.Drawing.Point(22, 74);
this.checkBoxUseModiInTesseractForUnknownWords.Name = "checkBoxUseModiInTesseractForUnknownWords";
this.checkBoxUseModiInTesseractForUnknownWords.Size = new System.Drawing.Size(165, 17);

42
src/Forms/VobSubOcr.cs
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@ -996,12 +996,20 @@ namespace Nikse.SubtitleEdit.Forms
i++;
}
}
comboBoxModiLanguage.SelectedIndex = -1;
}
var sb = new StringBuilder();
int badWords = 0;
var textWithOutFixes = new StringBuilder();
textWithOutFixes.Append(Tesseract3DoOcrViaExe(bitmap, _languageId));
if (textWithOutFixes.ToString().Trim().Length == 0)
{
textWithOutFixes = new StringBuilder();
textWithOutFixes.Append(TesseractResizeAndRetry(bitmap));
}
sb.Append(textWithOutFixes.ToString());
int numberOfWords = sb.ToString().Split((" " + Environment.NewLine).ToCharArray(), StringSplitOptions.RemoveEmptyEntries).Length;
@ -1012,6 +1020,22 @@ namespace Nikse.SubtitleEdit.Forms
line = _ocrFixEngine.FixOcrErrors(line, index, _lastLine, true, checkBoxGuessUnknownWords.Checked);
int wordsNotFound = _ocrFixEngine.CountUnknownWordsViaDictionary(line);
if (wordsNotFound > 0)
{
string newText = TesseractResizeAndRetry(bitmap);
newText = _ocrFixEngine.FixOcrErrors(newText, index, _lastLine, true, checkBoxGuessUnknownWords.Checked);
int newWordsNotFound = _ocrFixEngine.CountUnknownWordsViaDictionary(newText);
if (newWordsNotFound < wordsNotFound)
{
wordsNotFound = newWordsNotFound;
textWithOutFixes = new StringBuilder();
textWithOutFixes.Append(newText);
sb = new StringBuilder();
sb.Append(newText);
}
}
if (wordsNotFound > 0 || sb.ToString().Replace("~", string.Empty).Trim().Length == 0)
{
_ocrFixEngine.AutoGuessesUsed.Clear();
@ -1106,6 +1130,18 @@ namespace Nikse.SubtitleEdit.Forms
return line;
}
private string TesseractResizeAndRetry(Bitmap bitmap)
{
string result = Tesseract3DoOcrViaExe(ResizeBitmap(bitmap, bitmap.Width * 2, bitmap.Height * 2), _languageId);
if (result.Trim().Length == 0)
{
result = Tesseract3DoOcrViaExe(ResizeBitmap(bitmap, bitmap.Width * 3, bitmap.Height * 2), _languageId);
if (result.ToString().Trim().Length == 0)
result = Tesseract3DoOcrViaExe(ResizeBitmap(bitmap, bitmap.Width * 4, bitmap.Height * 2), _languageId);
}
return result.TrimEnd();
}
private void LogOcrFix(int index, string oldLine, string newLine)
{
listBoxLog.Items.Add(string.Format("#{0}: {1} -> {2}", index+1, oldLine.Replace(Environment.NewLine, " "), newLine.Replace(Environment.NewLine, " ")));
@ -1452,7 +1488,7 @@ namespace Nikse.SubtitleEdit.Forms
saveFileDialog1.Title = Configuration.Settings.Language.VobSubOcr.SaveSubtitleImageAs;
saveFileDialog1.AddExtension = true;
saveFileDialog1.FileName = "Image" + _selectedIndex;
saveFileDialog1.Filter = "PNG image|*.png|BMP image|*.bmp|GIF image|*.gif";
saveFileDialog1.Filter = "PNG image|*.png|BMP image|*.bmp|GIF image|*.gif|TIFF image|*.tiff";
saveFileDialog1.FilterIndex = 0;
DialogResult result = saveFileDialog1.ShowDialog(this);
@ -1471,8 +1507,10 @@ namespace Nikse.SubtitleEdit.Forms
bmp.Save(saveFileDialog1.FileName, System.Drawing.Imaging.ImageFormat.Png);
else if (saveFileDialog1.FilterIndex == 1)
bmp.Save(saveFileDialog1.FileName);
else
else if (saveFileDialog1.FilterIndex == 2)
bmp.Save(saveFileDialog1.FileName, System.Drawing.Imaging.ImageFormat.Gif);
else
bmp.Save(saveFileDialog1.FileName, System.Drawing.Imaging.ImageFormat.Tiff);
}
catch (Exception exception)
{

22
src/Logic/OCR/OcrFixEngine.cs
View File

@ -575,9 +575,22 @@ namespace Nikse.SubtitleEdit.Logic.OCR
if (autoFix && useAutoGuess)
{
List<string> guesses = new List<string>();
if (word.Length > 5)
{
foreach (string guess in CreateGuessesFromLetters(word))
guesses = (List<string>)CreateGuessesFromLetters(word);
}
else
{
guesses.Add(word.Replace("fi", "fi"));
guesses.Add(word.Replace("fi", "fj"));
guesses.Add(word.Replace("fl", "fl"));
if (!word.EndsWith("€") && !word.StartsWith("€"))
guesses.Add(word.Replace("€", "e"));
guesses.Add(word.Replace("fi", "fj"));
}
foreach (string guess in guesses)
{
if (IsWordOrWordsCorrect(_hunspell, guess))
{
@ -596,7 +609,6 @@ namespace Nikse.SubtitleEdit.Logic.OCR
}
}
}
}
if (!correct && promptForFixingErrors)
{
List<string> suggestions = _hunspell.Suggest(word);
@ -636,8 +648,8 @@ namespace Nikse.SubtitleEdit.Logic.OCR
case OcrSpellCheck.Action.AddToUserDictionary:
if (_userWordListXmlFileName != null)
{
_userWordList.Add(_spellCheck.Word);
Utilities.AddToUserDictionary(_spellCheck.Word, _fiveLetterWordListLanguageName);
_userWordList.Add(_spellCheck.Word.Trim().ToLower());
Utilities.AddToUserDictionary(_spellCheck.Word.Trim().ToLower(), _fiveLetterWordListLanguageName);
}
result.Word = _spellCheck.Word;
result.Fixed = true;
@ -800,7 +812,7 @@ namespace Nikse.SubtitleEdit.Logic.OCR
private static string AddToGuessList(List<string> list, string word, int index, string letter, string replaceLetters)
{
if (string.IsNullOrEmpty(word) || index < 0 || index >= word.Length)
if (string.IsNullOrEmpty(word) || index < 0 || index + letter.Length - 1 >= word.Length)
return word;
string s = word.Remove(index, letter.Length);