Captcha Cracking Javascript
Basically, I want to know if there is an existing OCR script written in JavaScript that can extract sentences/words from an image (using canvas, for example). I know there are some scripts that do relatively small tasks such as captcha-cracking, but I haven't yet come across a script for extracting full sentences.
Captcha-Cracking Program Using Torch
This is a program aiming to crack some CAPTCHA of several websites, which mayinclude both traditional and deep learning method.
1. Traditional Methods
By traditional methods, we firstly need to preprocess the image like removing noisesin the background, and do the slant correction if the character have some rotated angles.Then just cut out each single characters and train a classifier to recognize them.
2. Deep Learning Methods
In this program, we mainly use a Convolutional Neural Network model developed by Google,which was slightly different from LeNet-5, and was firstly desigined to extractstreet view house number(SVHN) from Google Map.Click here to read the origin article.Multi-digi Number Recognition from Street View Imagery using Deep Convolutional Neural Networks
About Torch7 & OpenCV
Torch7 is a scientific computing framework based on Lua. We can easily buildany complex deep learing model using Torch7.Install torch7 by following these commands,
OpenCV is a open source computer vision library. We use opencv to pre-processthe image before we formally begin the recogize it. And we mainly use Python interface in the program.Install opencv through apt-get
web service
Tornado is a Python web framewrok and asynchronous networking library.Install tornado-4.3 by pip, and using redis to connect tornado and torch7.
Model A: SVHN Model
When cracking type1 to type10 CAPTCHA, our model is always prefixed with svhn,which we have already explained up there.Follow the following steps to manually train a CAPTCHA recognizer.
Step 0: Go to the ./src/ sub derectory
Step 1: Generate synthetic pictures with labels
Step 2: Dump full data set
Step 3: Train the model
Model B: Simple Model
Some type of Captcha has fixed position of every character we need to crack, so we can cut out anduse any simple classifier to recognize them. But the pre-process is essential and important.Our type4 Captcha, including four websites belonging to four provinces, can be cracked by this way.Type4 Captcha including chongqing(chq), gansu(gs), ningxia(nx) and tianjin(tj).Here are some details.
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Step 0:
Step 1: Generate some pictures with labels
This script will generate some pictures under ./trainpic/type4/
Step 2: dump data before training
You can manually move the *.dat to ./data/ for better directory organization.
Step 3: training
Step 4: predictionWe have 200 pictures without labels prepared for prediction.Or you can just predict just one picture.
I have an idea for a CMS enhancement, to extract text information from images (for example, scanned documents), and want to know if there is already anything out there to help me along?
Basically, I want to know if there is an existing OCR script written in JavaScript that can extract sentences/words from an image (using canvas, for example).
Captcha Cracking Javascript Video
I know there are some scripts that do relatively small tasks such as captcha-cracking, but I haven't yet come across a script for extracting full sentences.
Is there such a thing, or would I need to write it from scratch?
closed as off-topic by Tomáš Zato, Kodos Johnson, E_net4, Brian Knight, kelinNov 29 '17 at 18:27
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3 Answers
Take a look at https://github.com/selead/node-ocr. It's a CoffeeScript libray to access ABBYY Cloud OCR SDK service.
corvuscorvusThere is a tesseract module for node.js available on github.
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