电子科线女学光电科学与工程学院 SCHOOL OF OPTOELECTRONIC SCIENCE AND ENGINEERING OF UESTC 1.Image Negative S L-1 s=L-1-r White sl ..o(rl,s1) L=the number of gray levels s2 Q(r2,s2) 0r1 r2 L-1 Black Input intensity White1. Image Negative L = the number of gray levels s L r = − −1 White Input intensity Output intensity 0 L-1 L-1 Black White r s (r1,s1) (r2,s2) r1 r2 s1 s2