Re:OCRopus: high-quality open source OCR sponsored by Google...
by viraptor on Sunday April 18, 2010 @08:17PM
(#1275741)
1. OCRs don't work well with text distorted in typical-captcha ways. They fail with colours especially.
2. Captchas have limited output sets and special characteristics, which make using OCR for them both costly and ineffective in comparison to dedicated solutions. Specifically, you can generate as many perfect sample outputs from a captcha system as you want - and then analyse it in ways beyond the standard character recognition.
2. Captchas have limited output sets and special characteristics, which make using OCR for them both costly and ineffective in comparison to dedicated solutions. Specifically, you can generate as many perfect sample outputs from a captcha system as you want - and then analyse it in ways beyond the standard character recognition.