A Study on Captcha Recognition

Through most of captcha images all said that their system can defense the external attacking, many corresponding researches are still presented to examine the captcha systems in the current internet platforms. The safety of captcha image can be decided by the complexity of imaging structures. Therefore, different captcha recognition methods are proposed to apply into different captcha images. In this study, there are many noisy lines and points in our testing captcha cases. We proposed the probability pattern framework to recognize the target numbers in the captcha images. In the experiment, the quantitative assessment shows that the proposed recognition method achieved an average of 81.05% for more than two thousand captcha cases.