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 Topic  |
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nitinchandra
India
1 Posts |
 Posted - Dec 10 2011 : 11:56:44
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Hi Fabrizio,
I was checking out IEVision and intend to update the ImageEnDemo to include the new features. I tried the OCR part first in IEVision and have a few queries...
I wanted to confirm if this is the correct method of doing so as also if I should release the "FinalText" variable here or would that be taken care of by IEVision. The function works as expected...so far :)
There are a couple of other things I wanted to know...
1. Is a 24 bit conversion required for OCR? I tried the UINT1 with 1 channel etc options, did not work. Tesseract requires a 1 BPP image and as far as OCR is concerned, I have used ImageEn in the past to convert images into 1 BPP with cleanup for OCR. First reducing the image to 1BPP suitable for OCR and then reconverting it back to 24 BPP is an overhead. Perhaps I could not figure out how to, or, maybe currently it's not an option.
2. How would I get word/line boxes and confidence levels in the recognized text? Somewhat like the hocr config in Tesseract...would that be an option in a future version?
The OCR function is as follows:
void __fastcall TImageEnVectDemo::OCRImage1Click(TObject *Sender)
{
_di_TIEVisionImage IEVImage;
_di_TIEVisionOCR IEVOCR;
_di_TIEVisionWString IEVString;
wchar_t *FinalText;
if ( IEVisionAvailable() )
{
// 24 bit seems to be required...so save current
ImageEn->Proc->AutoUndo = false;
ImageEn->Proc->SaveUndo();
ImageEn->LockPaint();
ImageEn->LockUpdate();
Screen->Cursor = crHourGlass;
ImageEn->Proc->ConvertTo24Bit();
ImageEn->IEBitmap->Origin = ieboTOPLEFT;
IEVisionLib->createImage( ImageEn->IEBitmap->Width, ImageEn->IEBitmap->Height, ievUINT8, 3, ImageEn->IEBitmap->Rowlen, ImageEn->IEBitmap->ScanLine[0], true, IEVImage );
IEVisionLib->createOCR( ":ENG", true, IEVOCR );
IEVOCR->setAccuracy( ievACCURATE, true );
IEVOCR->recognize( IEVImage, IEVisionRect(0,0,0,0), true, IEVString );
IEVString->c_str( true, FinalText );
ImageEn->Proc->Undo();
ImageEn->Proc->AutoUndo = true;
ImageEn->UnLockUpdate();
ImageEn->UnLockPaint();
Screen->Cursor = crDefault;
MessageDlg( FinalText, mtInformation, TMsgDlgButtons() << mbOK, 0 );
}
else
MessageDlg( "IEVision DLL is required in the system path", mtError, TMsgDlgButtons() << mbOK, 0 );
}
Regards,
Nitin Chandra |
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fab
1310 Posts |
Posted - Dec 11 2011 : 07:27:16
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Hi Nitin,
quote:
1. Is a 24 bit conversion required for OCR?
24 bit conversion is required for IEVision 1.0.0. From next minor release IEVision will accept also 1bpp and 8 bit gray scale images.
quote:
2. How would I get word/line boxes and confidence levels in the recognized text? Somewhat like the hocr config in Tesseract...would that be an option in a future version?
It is the same. Current version doesn't allow word boxes and line boxes. Next minor release will allow word boxes.
It will allow more simplified code avoiding this:
ImageEn->IEBitmap->Origin = ieboTOPLEFT;
IEVisionLib->createImage( ImageEn->IEBitmap->Width, ImageEn->IEBitmap->Height, ievUINT8, 3, ImageEn->IEBitmap->Rowlen, ImageEn->IEBitmap->ScanLine[0], true, IEVImage ); |
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