New version of tesseractdotnetwrapper
Cong Nguyen
Sarel van der Merwe
I'm using VS2010.
Not sure on how to compile the IPoVn.IPCore project, must i compile it
in c# or C++?
I opened the "IPoVn - Image Processing of Vietnamese.sln" using Visual
Studio 2010.
Tried to build and got the missing assembly reference errors
Please help...
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cong nguyenba
IPoVn.IPCore project is clr project, it mixed between .net and c++.
Simple1.cs uses tesseract.dll only. So, you can exclude Simple2.cs,
Simple3.cs; and remove IPoVn.IPCore.dll, IPoVnSystem from IPoVn.OCRer
project.
Andreas Reiff
needs: Attempted to read or write protected memory. This is often an
indication that other memory is corrupt.
The code is more or less copied from your simple1 - my bitmap does not
come out of a file but from a screenshot (part of the screen).
public static void Recognize(Bitmap bmp)
{
string language = "eng";
int oem = (int)eOcrEngineMode.OEM_DEFAULT;
using (TesseractProcessor processor = new TesseractProcessor())
{
DateTime started = DateTime.Now;
DateTime ended = DateTime.Now;
string tessdataFolder = @"D:\Temp\IPoVnOCRer\IPoVn\Test
\Tessdata";
processor.Init(tessdataFolder, language, oem);
string text = "";
unsafe
{
started = DateTime.Now;
text = processor.Recognize(bmp);
ended = DateTime.Now;
Console.WriteLine("Duration recognition: {0} ms\n\n",
(ended - started).TotalMilliseconds);
}
Console.WriteLine(
string.Format("RecognizeMode: {1}\nRecognized Text:\n{0}\n+
+++++++++++++++++++++++++++++++\n", text,
((eOcrEngineMode)oem).ToString()));
}
}
BTW, thx for writing a wrapper - if it works, it solves just about all
my problems. :)
Quan Nguyen
Try adding a slash to the data path, such as:
string tessdataFolder = @"D:\Temp\IPoVnOCRer\IPoVn\Test\Tessdata\";
I'm curious as to why you use unsafe block in your code.
Quan
Andreas Reiff
That did the trick, many thanks!
By the way, I am using unsafe, because it is in the example
Simple1.cs.
Apart from that, I would rather not use it, since it propagates up..
and it doesn't prevent an application from crashing anyway.
If you find the time, could you answer one more related question: I
want to do screen text recognition, like text on menus, in notepad,
and the like. Your testdata seems to be rather bad for this (now that
it is running, I could test). How best to handle this? Create/get new
testdata? Is it possible to use it without testdata at all?
I would have expected screen recognition to be especially easy, since
there is no noise. But then again, I have spent too little time to
look into this yet.
Best wishes,
Andreas
>
> - Zitierten Text anzeigen -
Sven Pedersen
it is usually 72-90dpi you must rescale them to 200-300dpi, then
you'll see a drastic improvement in accuracy. I don't know anything
about the C# stuff though...
--Sven
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--
``All that is gold does not glitter,
not all those who wander are lost;
the old that is strong does not wither,
deep roots are not reached by the frost.
From the ashes a fire shall be woken,
a light from the shadows shall spring;
renewed shall be blade that was broken,
the crownless again shall be king.”
Andreas Reiff
Actually, that is what I did, and it is working.. between better and
great (of course, my expectations go up with me seeing what is
possible).
I have also written my own convert-to-grayscale and max-contrast,
allowing even for some increase above max values (putting some values
close to max and min to black and white as well).
It is working a lot better.
I still get occasional bad results (though way less frequently).
So, for anyone wanting to do this as well: scaling up the image by a
factor of 3 and increasing the contrast improves recognition quality a
lot.
I wonder: is there any testdata for Windows with standard fonts? Or
how to approach this?
Best wishes
Andreas
Quan Nguyen
By scaling the screenshots to a higher resolution, to about 300 DPI,
you'd likely get better results. VietOCR.NET has a Screenshot mode
that performs this rescaling. You may want to check it out.
I believe the language packs included in tesseractdotnet are
Tesseract's standard issues. The eng seems to work very well for
Windows' standard fonts. Check the site http://code.google.com/p/tesseract-ocr/
for more info.
Quan
>
> - Show quoted text -
cong nguyenba
The unsafe statement does not need in Simple1.cs.
tesseract-ocr recommended 300 DPI, but you can pre-process image first
with others.
Maybe, you should check the initialization tesseract processor before
doing anything:
if (processor.Init(...))
{
.............
}
Here the link to download assemblies only:
http://tesseractdotnet.googlecode.com/files/IPoVn_Release_x86.zip
Sarel van der Merwe
cong nguyenba
Sarel van der Merwe
having the dll using the latest dotnetframework.
The program compiles clean without any warning using the 2008 dll’s.
It only gives
"unhandled Exception : System.IO.FileLoadException: Mixed mode
assembly is build against v2.0.50727 of the runtime and cannot be
loaded in the 4.0 runtime"
I even tried changing the target Framework to 3.5 without any success
Thanks for your support,
On Thu, Jul 7, 2011 at 4:24 AM, cong nguyenba <congng...@gmail.com> wrote:
> Not yet now, I have not installed vs2010 on my machine.
>
Sarel van der Merwe
-----------------------------------------------------------------------------------------------------------
Could not load file or assembly 'tesseract, Version=0.0.0.0,
Culture=neutral, PublicKeyToken=null' or one of its dependencies. This
application has failed to start because the application configuration
is incorrect. Reinstalling the application may fix this problem.
(Exception from HRESULT: 0x800736B1)
New environment
------------------------
OS: windows xp with SP3
Visual Studio 2008 c# express
Steps followed
------------------------
1. Create new project under vs2008
2. Added the following to project
~ Program.cs
~ Rendre.cs
~ Simple1.cs
~ Simple2.cs
~ Simple3.cs
~ Simple4.cs
~ Workspace.cs
3. Added the 3 assemblies to the reference
http://tesseractdotnet.googlecode.com/files/IPoVn_Release_x86.zip
Building Program
---------------------
1. Had to "allow unsafe code" in properties
2. Program compiles but don’t want to execute.
cong nguyenba
http://www.microsoft.com/download/en/details.aspx?id=5582
The Microsoft Visual C++ 2008 SP1 Redistributable Package (x86)
installs runtime components of Visual C++ Libraries required to run
applications developed with Visual C++ SP1 on a computer that does not
have Visual C++ 2008 SP1 installed.
Sarel van der Merwe
1. Reboot and recompiled.
2. Still having the same problem.
Could not load file or assembly 'tesseract, Version=0.0.0.0,
Culture=neutral, PublicKeyToken=null' or one of its dependencies. This
application has failed to start because the application configuration
is incorrect. Reinstalling the application may fix this problem.
(Exception from HRESULT: 0x800736B1)
Please take a look if i haven't done something wrong.
Attached please find project with the simple
Thanks
Sarel
Quan Nguyen
Platform target is also x86.
On Jul 9, 7:00 am, Sarel van der Merwe <sfvdme...@gmail.com> wrote:
> I installed the redistribution pack.
>
> 1. Reboot and recompiled.
> 2. Still having the same problem.
>
> Could not load file or assembly 'tesseract, Version=0.0.0.0,
> Culture=neutral, PublicKeyToken=null' or one of its dependencies. This
> application has failed to start because the application configuration
> is incorrect. Reinstalling the application may fix this problem.
> (Exception from HRESULT: 0x800736B1)
>
> Please take a look if i haven't done something wrong.
> Attached please find project with the simple
>
> Thanks
>
> Sarel
>
> > Try to download and install vcresdist_x86 here:
> >http://www.microsoft.com/download/en/details.aspx?id=5582
>
> > The Microsoft Visual C++ 2008 SP1 Redistributable Package (x86)
> > installs runtime components of Visual C++ Libraries required to run
> > applications developed with Visual C++ SP1 on a computer that does not
> > have Visual C++ 2008 SP1 installed.
>
> > --
> > You received this message because you are subscribed to the Google
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> > To post to this group, send email to tesser...@googlegroups.com
> > To unsubscribe from this group, send email to
> > tesseract-oc...@googlegroups.com
> > For more options, visit this group at
> >http://groups.google.com/group/tesseract-ocr?hl=en
>
>
>
> 17KViewDownload
Sarel van der Merwe
Could not load file or assembly 'tesseract, Version=0.0.0.0,
Culture=neutral, PublicKeyToken=null' or one of its dependencies. This
application has failed to start because the application configuration
is incorrect. Reinstalling the application may fix this problem.
(Exception from HRESULT: 0x800736B1)
I think the Microsoft.VC80.CRT version is the root of the cause.
In the add remove programs I found 3 versions of the MS Visual c++
2008 Redistributable
x86 9.0.30729
x86 9.0.30729.17
x86 9.0.30729.6161
PS. This was a clean windows xp pro with Visual Studio 2008 express.
Any suggestions.....
Sarel van der Merwe
For this to work you must have MS Visual Studio C++ Express also loaded.
I only had MS Visual Studio C# Express loaded.