Enhancing Slide Presentation Accessibility for Blind and Low-Vision Audiences Through Delay-Buffered Editing

Slide presentations are central to classrooms and conferences but remain inaccessible to blind and low vision (BLV) audiences. Presenters rarely describe visual content or announce slide changes, leaving BLV participants with fragmented access. We present a delay-buffered editing approach that trims redundant speech and inserts concise slide descriptions at transition points in recorded presentations, operating within a fiveĝ€'second buffer. An exploratory study showed that trimming filler speech created sufficient space for descriptions and that added descriptions improved comprehension and orientation. Building on these findings, we developed an automated editing pipeline that processes recorded presentation videos and evaluated it with 12 BLV participants. Edited audios improved comprehension (from 50.0% to 88.9%), slide detection (from 16.7% to 100%), and recognition of visual elements, while participants also noted challenges in timing and prosody. These results establish delay-buffered editing as a promising approach for enhancing accessibility of recorded presentations with slides, and suggest design directions for future live deployment.