charlesw/tesseract-samples

Samples for the Tesseract.Net wrapper

Samples that demonstrate using Tesseract .Net Wrapper.

ConsoleDemo

A short demo that ocr's an image and prints out the results using both Page.GetText() and a result iterator.

Web Demo

A simple demonstration of using Tesseract from within ASP.NET.

Warning: To keep things simple the sample will create a new instance of the TesseractEngine each time a image is processed. However this is not performant as creating a new TesseractEngine is expensive and would be a good candiate for pooling to allow a single engine instance to be reused.

License

Copyright 2012-2015 Charles Weld.

Licensed under the [Apache License, Version 2.0][apache2] (the "License"); you may not use this software except in compliance with the License. You may obtain a copy of the License at:

[http://www.apache.org/licenses/LICENSE-2.0][apache2]

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

tesseract-samples's Issues

Sample phototest.tif ouput is incorrect

From the image: "This is a lot of 12 point text to test the ocr code..."

"ocr" is output as "cor" when I run the samples.

Is it just me?

System.Runtime.InteropServices.SEHException: 'External component has thrown an exception.'

In the console demo, running with no changes, I immediately get the error in the title on line 24 in Program.cs
var text = page.GetText();

stacktrace:
Fatal error. System.Runtime.InteropServices.SEHException (0x80004005): External
component has thrown an exception.
at InteropRuntimeImplementer.TessApiSignaturesInstance.TessApiSignaturesImplementation.BaseApiRecognize(System.Runtime.InteropServices.HandleRef, System.Runtime.InteropServices.HandleRef)
at Tesseract.Page.Recognize()
at Tesseract.Page.GetText()
at Tesseract.ConsoleDemo.Program.Main(System.String[])

Failed to find library "liblept1753.dll" for platform x64

When I try to deploy the solution to server, I get following issue.

This is the event trace I got. Already tried adding CustomSearchPath to bin x64 and x86 folders, even tried copying those dll to the bin folder.

Following line is causing the above error.
TesseractEngine engine = new TesseractEngine(tesseractDataFolder, "eng", EngineMode.Default);

This works perfectly fine on local machine, even copied server dll to local and tried, then again works fine.

Local machine - Windows 10 and server side - Windows 7 (No idea if there's any link to this issue)

Any suggestions to solve this?

[Web App] Failed to find library "leptonica-1.82.0.dll" for platform x64

Repro steps:
1- Clone the project
2- Build
3- Run the Web Application
4- Choose file (< 1MB)
5- Click Submit

OS: Win 10 Version 21H2 (OS Build 19044.2251)
Browser Chrome Version 107.0.5304.123 (Official Build) (64-bit)

ASP Core 6 samples issue

Hello, this does not run on ASP Core 6, can you please update the sample

Generate searchable PDF from .tiff or not searchable PDF

Can I generate a searchable PDF from .tiff or pdf?
By command line, tesseract allows me to do this.

Strong Name

Previous versions V3 etc where built and signed with a strong name (framework versions)
Can we get a V5 built with a strong name

How to Train special character.

I need to get the currency symbol (৳) of Bangladesh. Please see the image below:

output is:

expected values are ৳00 instead of 400, ৳15 instead of 615.....
OR
expected values are 00 instead of 400, 15 instead of 615...

Failed to find library "liblept172.dll" for platform x86.

Hello Guy,

Please help me resolve this problem: Failed to find library "liblept172.dll" for platform x86.
I have downloaded this sample, but when i extract and open solution and run. It is raised an error

Thanks,
linh tong

Failed to load image

I am using the sample code provided in a console application. For some sample files, i am able to get the results printed while in some case it throws an exception. I tried to see the difference between the working and non working images but the meta data seems very similar.

I am using magick.net library with ghost script to convert PDF to TIF/PNG. I use those images in the tesseract engine to validate the results.

using (var img = Pix.LoadFromFile(testImagePath)) : Line 26

Exception:
System.IO.IOException: Failed to load image '\Snakeware.Page1.tif'.
at Tesseract.Pix.LoadFromFile(String filename)
at ConsoleApp3.utils.Ocr.performOCR() in \Ocr.cs:line 26

Input pattern?

Is it possible to use an user patterns file for TesseractEngine.Process?

Failed to initialise tesseract engine..

Hi
I am facing the error while initializing the TesseractEngine. Below is the stacktrace
at Tesseract.TesseractEngine.Initialise(String datapath, String language, EngineMode engineMode, IEnumerable1 configFiles, IDictionary2 initialValues, Boolean setOnlyNonDebugVariables)
at Tesseract.TesseractEngine..ctor(String datapath, String language, EngineMode engineMode, IEnumerable1 configFiles, IDictionary2 initialOptions, Boolean setOnlyNonDebugVariables)
at Tesseract.TesseractEngine..ctor(String datapath, String language, EngineMode engineMode)
at ConsoleApplication.Program.Main(String[] args) i

error finding Default.aspx

Almost certianly due to my own stupidity - but I keep getting "The requested URL /Default.aspx was not found on this server"
Any suggestions?
I've set this page as the startup page, etc. - but still get this error.

Thanks!

How to value in row

Latest version vs .NET