Hi, I am Dr. Asad Naeem, I have a PhD in image processing , and i have been breaking captchas in the past on freelancer and other places. I am also an expert in machine learning and use Neural nets and support vector machines to train and break the captchas.
Please visit my profile and review the projects i have done, I have delivered captchas with 85-50% accuracy which are pretty fast for most bots.
Every captcha is different, hence requires a different segmentation and character localization algorithm. Hence without looking and experimenting with a specific captcha, no one can guarantee its accuracy rate.
Do send me some links to captchas you want me to break.
Plus, please shed some light on what this job is, is it hourly, monthly, project based ?
Cheers
Dr. Asad Naeem