tesseract-4.0.0a supports below psm. If you want to have single character recognition, set psm = 10. And if your text consists of numbers only, you can set tessedit_char_whitelist=0123456789. Page segmentation modes: 0 Orientation and script detection (OSD) only. 1 Automatic page segmentation with OSD. 2 Automatic page segmentation, but no OSD, or OCR. 3 Fully … Read more
Recognizing only numbers is actually answered on the tesseract FAQ page. See that page for more info, but if you have the version 3 package, the config files are already set up. You just specify on the commandline: tesseract image.tif outputbase nobatch digits As for the threshold value, I’m not sure which you mean. If … Read more
Like you I also faced many problems implementing OCR in Android, but after much Googling I found the solution, and it surely is the best example of OCR. Let me explain using step-by-step guidance. First, download the source code from https://github.com/rmtheis/tess-two. Import all three projects. After importing you will get an error. To solve the … Read more
Create a config file (e.g “letters”) in tessdata/configs directory – usually /usr/share/tesseract/tessdata/configs or /usr/share/tesseract-ocr/tessdata/configs And add this line to the config file: tessedit_char_whitelist abcdefghijklmnopqrstuvwxyz …or maybe [a-z] works. I don’t know. Then call tesseract similar to this: tesseract input.tif output nobatch letters That will limit tesseract to recognize only the wanted characters.
I got this error because I installed pytesseract with pip but forget to install the binary. On Linux sudo apt update sudo apt install tesseract-ocr sudo apt install libtesseract-dev On Mac brew install tesseract On Windows download binary from https://github.com/UB-Mannheim/tesseract/wiki. then add pytesseract.pytesseract.tesseract_cmd = ‘C:\\Program Files (x86)\\Tesseract-OCR\\tesseract.exe’ to your script. (replace path of tesseract binary … Read more
Tesseract is an OCR engine. It’s used, worked on and funded by Google specifically to read text from images, perform basic document segmentation and operate on specific image inputs (a single word, line, paragraph, page, limited dictionaries, etc.). OpenCV, on the other hand, is a computer vision library that includes features that let you perform … Read more
You can grab eng.traineddata Github: wget https://github.com/tesseract-ocr/tessdata/raw/main/eng.traineddata Check https://github.com/tesseract-ocr/tessdata for a full list of trained language data. When you grab the file(s), move them to the /usr/local/share/tessdata folder. Warning: some Linux distributions (such as openSUSE and Ubuntu) may be expecting it in /usr/share/tessdata instead. # If you got the data from Google, unzip it first! … Read more
I see steps are scattered in different answers. Based on my recent experience with this pytesseract error on Windows, writing different steps in sequence to make it easier to resolve the error: 1. Install tesseract using windows installer available at: https://github.com/UB-Mannheim/tesseract/wiki 2. Note the tesseract path from the installation. Default installation path at the time … Read more
fix DPI (if needed) 300 DPI is minimum fix text size (e.g. 12 pt should be ok) try to fix text lines (deskew and dewarp text) try to fix illumination of image (e.g. no dark part of image) binarize and de-noise image There is no universal command line that would fit to all cases (sometimes … Read more