13. The computer system of claim 9 , wherein the image selection module implements a cost function and identifies a set of real sample images that minimizes the cost function.
13. The computer system of claim 9 , wherein the image selection module implements a cost function and identifies a set of real sample images that minimizes the cost function. 14. The computer system of claim 13 , wherein the cost function comprises a target cost indicative of a difference between a visual feature vector in the visual feature vector sequence and a visual feature vector related to a real sample image.