Motion video from isochrome transit rate

I propose motion video can be recovered from measurement of the rate at which objects traverse the isochromes of an optical crystal. If the crystal is sandwiched between polarizers and light filtered by an etalon whose free spectral range matches the isochrome's spectral interval, a bulk photodiode integrating transmitted light over solid angle and spectrum produces photocurrent whose frequency is proportional to angular rate. I show how to compute photocurrent frequency and phase for an arbitrary scene and results from numerical simulation of a moving point source observed through an electrooptically driven LiNbO3 crystal. Although this new approach does not image and its detector is not pixilated, solution of a frequency-domain inverse problem may recover motion video. Compared to imaging, the potential advantage is scaling by parallel addition of photocurrent from lateral arrays of crystal-photodiode assemblies and uncooled operability from the ultraviolet through the long-wave infrared.