May 2017
Beginner to intermediate
220 pages
5h 2m
English
Content preview from Python Web Scraping - Second Edition
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Further improvements
To improve the CAPTCHA OCR performance further, there are a number of possibilities, as follows:
- Experimenting with different threshold levels
- Eroding the thresholded text to emphasize the shape of characters
- Resizing the image (sometimes increasing the image size helps)
- Training the OCR tool on the CAPTCHA font
- Restricting results to dictionary words
If you are interested in experimenting to improve performance, the sample data used is available at http://github.com/kjam/wswp/blob/master/data/captcha_samples. There is also a script to test the accuracy at http://github.com/kjam/wswp/blob/master/code/chp7/test_samples.py. However, the current 88 percent accuracy is sufficient for our purposes of registering an account ...
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