Now tesseract is provided by the javacv project, this is a far better option than using Tess4J since all that is required is adding a single dependency to your pom file, the native libs for your platform will then be downloaded and linked automatically for you by the javacv tesseract version. I’ve created an example … Read more
Although I’m not sure how to translate the following algorithm into GA (and I’m not sure why you need to use GA for this problem), and I could be off base in proposing it, here goes. The simple technique I would propose is to count the number of black pixels per row. (Actually it’s the … Read more
Ok. I found the solution here tessnet2 fails to load the Ans given by Adam Apparently i was using wrong version of tessdata. I was following the the source page instruction intuitively and that caused the problem. it says Quick Tessnet2 usage Download binary here, add a reference of the assembly Tessnet2.dll to your .NET … Read more
You will most likely need to do the following: Apply the Hough Transform algorithm on the entire page, this should should yield a series of page sections. For each section you get, apply it again. If the current section yielded 2 elements, then you should be dealing with a rectangle similar to the above. Once … Read more
After trying a lot of different fonts and OCR engines I tend to get the best results using Consolas. It is a monospaced typeface like OCR-A, but easier to read for humans. Consolas is included in several Microsoft products. There is also an open source font Inconsolata, which is influenced by Consolas. Inconsolata is a … Read more
I described some tips for preparing images for Tesseract here: Using tesseract to recognize license plates In your example, there are several things going on… You need to get the text to be black and the rest of the image white (not the reverse). That’s what character recognition is tuned on. Grayscale is ok, as … Read more
This look like a VS Tools for Apache Cordova (TACO) issue. As a workaround you can open platforms\windows\CordovaApp.sln, switch architecture to x64, add Nuget package to the CordovaApp.Windows project references, save (build will fail because of an issue in the PreBuild event: <PreBuildEvent> cd /d $(MSBuildThisFileDirectory) node -e “require(‘C:\\Users\\{username}\\AppData\\Roaming\\npm\\node_modules\\vs-tac\\lib\\hooks.js’).updateAppxManifest(‘C:\\ocrTest\\ocrTest\\platforms\\windows’,’C:\\ocrTest\\ocrTest\\platforms\\windows\\..\\..\\’)” </PreBuildEvent> you can also try to … Read more
To detect the rotation angle, use the Hough transformation. For noise reduction, replace any pixel, that does not have a neighbour (north, east, south or west) with the same color (a similar color, using a tolerance threshold), with the average of the neighbours. Search for vertical white gaps for layout detection. Slice along the vertical … Read more
Success. Many thanks to the people at the Pattern Recognition and Image Analysis Research Lab (PRImA) for producing tools to handle this. You can obtain them freely on their website or github. Below I give the full solution for a Mac running 10.10 and using the homebrew package manager. I use wine to run windows … Read more
Don’t know how good it is (it definitely needs to be trained first), but there is Ron Cemer’s Java OCR library.