<p>Modulation=(Imax-Imin)/(Imax+Imin)</p><p>MTF(modulation Transfer Function)=modulation in image/modulation in object所以他是没有单位的!</p><p>The rms spot diameter of a circle containing approximately 68% of the energy!</p><p><font color="#000000" style="BACKGROUND-COLOR: #ffffff;">线对数/mm=1mm/(均方根的半径*2)/2,或者:线对数/mm=1mm/(像斑的弥散半径*2)/2是指的同一回事。均方根的半径和像斑的弥散半径是The rms spot radius的中文翻译。如果你这样写[线对数/mm=1mm/弥散斑直径]或[line pairs/mm=1mm/(the rms spot diameter)]就不会产生混乱。<br/></font></p><p>MTF和spot diagram是两种评判光学质量的标准。好象他们没有必然的联系。</p>