电子科发女学光电科学与工程学院 SCHOOL OF OPTOELECTRONIC SCIENCE AND ENGINEERING OF UESTC 3,2 Some Basic Intensity Transformation Functions FIGURE 3.3 Some L-1 basic intensity transformation Negative functions.All curves were nth root scaled to fit in the 3L/4 range shown. Log nth power LR L/4 Identity Inverse log 0 0 L/4 LR 3L4 L-1 Input intensity level,r3.2 Some Basic Intensity Transformation Functions