This article explains and discusses the details of how modulation transfer function is invented. This particular function is practical in image engineering in information technology. And its invention entails basic knowledge of trigonometry, Dirac delta function, and Fourier analysis. Moreover, it is invented using familiarity with the point spread function and the line spread function created in physical optics. This function is an integral representing the Fourier transform of the line spread function. The invention is achieved through rigid experience in synthesizing diverse knowledge for producing a meaningful formula.
