Increasing the frame rate

Post-rendering image warp can also be used to artificially increase the frame rate. For example, suppose that only one rasterized image is produced every $100$ milliseconds by a weak computer or GPU. This would result in poor performance at $10$ FPS. Suppose we would like to increase this to $100$ FPS. In this case, a single rasterized image can be warped to produce frames every $10$ms until the next rasterized image is computed. In this case, $9$ warped frames are inserted for every rasterized image that is properly rendered. This process is called inbetweening or tweening, and has been used for over a century (one of the earliest examples is the making of Fantasmagorie, which was depicted in Figure 1.26(a)).