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This paper presents a novel technique to recover audio from sonorines, anearly 20th century form of analogue sound storage. Our method uses highresolution photographs of sonorines under different lighting conditions toobserve the change in reflection behavior of the physical surface features andcreate a three-dimensional height map of the surface. Sound can then beextracted using height information within the surface's grooves, mimicking aphysical stylus on a phonograph. Unlike traditional playback methods, ourmethod has the advantage of being contactless: the medium will not incur damageand wear from being played repeatedly. We compare the results of our techniqueto a previously successful contactless method using flatbed scans of thesonorines, and conclude with future research that can be applied to thisphotovisual approach to audio recovery.

Saving the Sonorine: Photovisual Audio Recovery Using Image Processing and Computer Vision Techniques