Re: [Bug-ocrad] ocrad usage

[Tilman Hausherr]

[2nd try, I accidentally sent this to Chris only]

I tested it a few years ago (the application I built still run fine) 
with 200dpi and 300dpi b/w files (not gray, not color). The results are 
OK but not great, but not as bad as you describe. I use it for an 
application where quality is not important, but speed is. I don't want 
to tell what I do with OCRAD, but I can think of other use cases, e.g. 
detect the language of a document.

I'd recommend that you scan directly into b/w files. Never never 
compress such files into JPEG, this will produce artefacts.

If you need higher quality, try tesseract. But it will be much slower.

Tilman

PS Please correct your date. Unless you really sent this mail in 2009.

Am 25.07.2009 um 22:15 schrieb Chris:
> Dear bugtrackers and developers,
>
>
>
> I am trying to use the gnu ocr OCRAD to extract text from scanned
> documents. Reviews of the software deem it to be "reasonably good" and
> to "produce fairly accurate results". Unfortunately, when I use OCRAD
> to parse images, I do not even get any barely usable results. The
> output of OCRAD looks more like a dumped gpg encrypted file then a
> document - I'm serious, not even remotely readable.
>
>
>
> I have tried everything I could think of. I printed the "quick brown
> fox jumps over the lazy dog" in Arial and New Times Roman, size ranging
> from 9 to 16 on an A4 paper and scanned it in color, grayscale and
> black-and-white, with 72, 300, 750 and 1200 dpi. The 12 scanned images
> each got saved as pbm and ppm. that makes 24 files and not even one was
> processed by ocrad to produce remotely readable results. The best
> approximation was "qa\;c_br0mfox ipmpsO wer the |psYdOq", by processing
> the 750 dpi grayscale pbm...
>
>
>
> Obviously, I'm doing something wrong here, but I don't know what. I am
> using kooka to scan the images from a HP Deskjet 4620F. Ocrad is
> version 0.17, running on SUSE 11.1 .
>
>
>
> If you could hint me to what I am doing wrong here, please do...
>
>
>
>
>
> thanks for your help in advance
>
>
>        
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