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FAQ

Where can l find a curated list of computer vision for Optical Character Recognition (OCR)?
Github. People make these awesome lists on Github where you can probably find one for everything. Here one for OCR I found s s Looks great to me.
How can I extract text from a PNG image using Python?
As others have mentioned pytesseract is a really sweet tool but doesn work so well for dirty data e.g. street signs in a photo or overlayed on a landscape ) and draw a bounding box around the shapes Rescale all bounding boxes to the resolution of the CIFAR-1 dataset (2x2 pixels iirc) and convert to grayscale Feed the bounding boxes to the classifier you trained in step 1 All bounding boxes the classifier predicted to be fro the 74k Chars dataset is likely to be a character in the photo if it predicts the bounding box is part of CIFAR-1 drop the sample If need be widen bounding boxes labeled as 74k Chars that are close together since theyre likely part of the same work or phrase (or just lower threshold on the contrast shift detector so it detects ONE bounding box for the whole word then do second step detection within that one to detect individual chars Now youre done you have groups of detected characters from the s 813 85 s. There are tons of great articles books and posts about different ways to do any and all of the steps so happy coding!
What is the best Python OCR library?
I came to rmend pytesseract as well (which others already did rmend) it super cool. Often though it depends on your domain so it might be worth doing it in house. If sticking to python it pretty straight forward to use the label # threshold_otsu # (Histogram of Gradients) to feed a Chars74k classifier. In some domains the available OCR libs don fit too well since in some OCR cases there are specific features in your data set that are a bit niche to your domain (skewed street signs from dash cams anime translation with low p-frame value duringpression or interlacing from DVD clone jpeg artifacts in pdf scans etc). I heard OCRopus might be worth looking into as well (haven used it personally) since it uses tesseract-ocr but adds layout analysis. s
How can I make an OCR using python and machine learning libraries?
Unless you are doing it for learning don make one from scratch. Try using Tessaract tesseract-ocr s . It is very good and already has a Deep Learning based model ( tesseract-ocr s ) integrated which works on a lot of data. If your data is too different from how looks in real world try finetuning it (as given here tesseract-ocr s ) . If you are learning some good starting points are CRNN bgshih s and s s . Use PyTorch or Tensorflow to code them up.
What libraries exist for text recognition in Java?
Here are some more libraries for processing in Java n JWebPro A Java-based Web Processing Toolkit Same as JWeb there is JText nJTextPro A Java-based Text Processing Toolkit JTextPro A Java-based Text Processing Toolkit Another library which uses LDA for topic extraction from is JGibbLDA n A Java Implementation of Latent Dirichlet Allocation (LDA) using Gibbs Sampling for Parameter Estimation and Inference # There is also mallet java library forma mining and nlp. You can find it here
How do I detect digits in an image using python?
pytesseract s module has an amazing one-liner try code import Image code except ImportError code from PIL import Image code import pytesseract as tes code code results = (('')boxes=True) code OpenCV sklearn and NumPye really handy to do this task. Digit Recognition using OpenCV sklearn and Python exs how to aplish the given task efficiently with detailed explanation.
How do I use PyTesser and Tesseract OCR in Ubuntu with Python?
tesseract-ocr It is an optical character reader as the name suggests it will try to read the characters from your input .n Tesseract installation n sudo apt-get install tesseract-ocr code pytesser and python-tesseract These are python wrapper classes that help you to use tesseract-ocr in your python program. PyTesser is for windows only and this project only reached to ..1 and abondoned since May 27 since you are on Ubuntu you aren't going to use it anyway. PIL Python Imaging Library it's not actively maintained and old so I suggest you to use Pillow which is an alternative to PIL. Both of these helps you manipulate with your to greyscale. code captcha = ('1') code code # Saving the to extract the characters in your terminaln $ python the_ (how it looks) the above code was a simple demonstration.
How can I read the contents of an image using Python?
You can use the WeOCR servers and then you don't need to install and configure Tesseract (not always trivial). See the code I once wroten OCR of an -from-a--using-python Since you already have the and then pass it to one of the WeOCR servers to get the result.