Log Transform Based Optimal Image Enhancement Using Firefly Algorithm for Autonomous Mini Unmanned Aerial Vehicle: An Application of Aerial Photography - Samanta, S.; Mukherjee, A.; Ashour, A.S.; Dey, N.; Tavares, J.M.R.S.; Abdessalem Karâa, W.B.; Taiar, R.; Azar, A.T.; Hassanien, A.E. (International Journal of Image and Graphics, 2018)