The potential value of public surveillance technology took on new meaning last week when investigators identified the two suspects in the. Chazelle - with the aid of a thresholding scheme to motion by mean curvature of filaments in R3 R 3. Olivia Premanis, conservator; Mary Baughman, conservator; and Jane Boyd. The first mainstream video to use one was Rhythm Is A Dancer, worn by singer Thea Austin. Travel, Wedding & Events, Portrait, Nature & Wildlife, Sports & Action.