Robust CAPTCHAs Towards Malicious OCR.

Jiaming Zhang Jitao Sang Kaiyuan Xu Shangxi Wu Xian Zhao Yanfeng Sun Yongli Hu Jian Yu

Published in: IEEE Trans. Multim. (2021)

Keyphrases

database
preprocessing
robust estimation
image noise
data mining
search engine
post processing
error correction
recognition errors