A Dual-Use Speech CAPTCHA: Aiding Visually Impaired Web Users while Providing Transcriptions of Audio Streams
Andy Schlaikjer · 2007
This work focuses on development of an alternative aural CAPTCHA technology based on a speech transcription task. The principal goals are (1) to provide a better quality of service for visually impaired web users who currently have few alternatives for accessing web services protected by CAPTCHAs based on visual perception tasks, (2) as a side effect of CAPTCHA use, collect meaning data, such as transcriptions of speech found in online audio streams, and (3) deploy the CAPTCHA publicly to increase the general awareness of accessibility concerns on the web for users with disabilities. Toward these ends, an experimental corpus of human transcriptions of short audio clips was created to support aural CAPTCHA experimentation. Results suggest that the techniques investigated represent viable aural reCAPTCHA mechanisms. 2