Early Motion Pictures of Eclipses (1639-1880)

Motion pictures of specific historical eclipses exist dating back more than 375 years.  In this post, I’ll present some of the oldest surviving examples for viewing in motion for the first time (as far as I’m aware): eleven from the seventeenth century, four from the eighteenth century, and six from the nineteenth century.  That makes…

The Wow Factor in Audio Restoration

Some kinds of audio restoration are on pretty firm ground these days: declicking and decrackling, for instance, or noise reduction.  But speed variance correction—the removal of wow and flutter—remains an extraordinarily daunting challenge.  It has a reputation for being the high-hanging fruit on the audio restoration tree, akin to rocket science or brain surgery.  The…

Time-Based Image Averaging

Imagine watching a time-lapse video covering more than a century that shows the evolution of a landscape, a magazine cover, trends in fashion, or automobile design.  Or picture the same thing being done with the face of a politician or celebrity from youth to old age, or with artistic trends in painting spanning a millennium…