Hummingbird Feeders. Hummingbirds get the energy they need to maintain their astonishing metabolism primarily from flower nectar and the sugar water they find at feeders (here's the recipe). Think of them as miniature flycatchers, and sugar is just the fuel for getting their real nourishment.
afÂ·terÂ·imÂ·age. n. A visual image that persists after the visual stimulus causing it has ceased to act. Also called photogene. (ËÉËftÉrËÉªmÉªdÊ).
1 Introduction to Optical Flow Optical ï¬ow is an approximation of the local image motion based upon local derivatives in a given sequence ofimages.That is, in 2D it speciï¬es how much each imagepixel movesbetween adjacent imageswhile in 3Din speciï¬eshow much each volume voxel moves between adjacent volumes. Introduction to Optical Flow Optical ï¬ow is an approximation of the local image motion based upon local derivatives in a given sequence ofimages.