We introduce an open labeling platform for Computer Vision researchers based on Captchas, creating as a byproduct labeled image data sets while supporting web security. For the two diﬀerent tasks of annotation and detection, we provide a security analysis and explore usability issues. We present the interfaces used by researchers, website administrators and users and experimental results obtained using the platform. Finally, we discuss system sustainability issues in the context of a broader “ecosystem” for the platform.
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