tesseract
Preprocessing image for Tesseract OCR with OpenCV
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
Tess4J: Invalid memory access
you can set the data path i am getting same problem when i set the data path that problem is solved try try this instance1.setDatapath(“D://Hotel_project//Tess4J-1.2-src//Tess4J//tessdata”);
How to implement Tesseract to run with project in Visual Studio 2010
OK, I figured it out but it works for Release and Win32 configuration only (No debug or x64). There are many linking errors under Debug configuration. So, 1. First of all, download prepared library folder(Tesseract + Leptonica) here: Mirror 1(Google Drive) Mirror 2(MediaFire) 2. Extract tesseract.zip to C:\ 3. In Visual Studio, go under C/C++ … Read more
How to detect Text Area from image?
Take a look at this bounding box technique demonstrated with OpenCV code: Input: Eroded: Result:
Detect white characters on black background using Tesseract
A paper by T. Kasar, J. Kumar, and A. G. Ramakrishnan describes one solution to the problem: “Font and Background Color Independent Text Binarization”. The paper can be found here. There is an implementation of the algorithm by Jason Funk. His implementation can be found here. I have had some success with the algorithm. I … Read more
Tesseract 3 (OCR) – .NET Wrapper
It appeared to be the contents of the tessdata folder that was causing the problem. Obtained the tessdata folder from the first link and all is now working.
Tesseract does not recognize single characters
You must set the “page segmentation mode” to “single char”. For example, in Android you do the following: api.setPageSegMode(TessBaseAPI.pageSegMode.PSM_SINGLE_CHAR);
pytesseract cannot find the file specified
Just hit the same error and decided to answer this question – it might help someone to save time… First, make sure you have installed/copied Tesseract-OCR executables. Windows can’t find the executable tesseract in the directories specified in your PATH environment variable. So either make sure that the directory containing tesseract is in your PATH … Read more
How can I use async to increase WinForms performance?
Yes, you’re still doing all the work on the UI thread. Using async isn’t going to automatically offload the work onto different threads. You could do this though: private async void button2_Click(object sender, EventArgs e) { string file = files[0]; Task<string> task = Task.Run(() => ProcessFile(file)); rtTextArea.Text = await task; } private string ProcessFile(string file) … Read more