电子科技女学光电科学与工程学院 SCHOOL OF OPTOELECTRONIC SCIENCE AND ENGINEERING OF UESTC 4.Measuring Image Information Image Entropy: i=-p.G)leg,p.)】 k=0 Tk P 87=87 0.25 7128=128 0.47 /186=186 0.25 25=255 0.03 fork≠87,128,186.255 0 i=-[0.251og20.25+0.471og20.47+0.251og20.25+0.03log20.03] ≈-[0.25(-2)+0.47(-1.09)+0.25(-2)+0.03(-5.06)] ≈1.6614bits/pixel4. Measuring Image Information  Image Entropy: 2222 [0.25log 0.25 0.47log 0.47 0.25log 0.25 0.03lo g 0.03] [0.25( 2) 0.47( 1.09) 0.25( 2) 0.03( 5.06)] 1.6614 / H bits pixel                 1 2 0 log L rk rk k H pr pr      