1. An apparatus for converting a two-dimensional image that has been divided into several imaginary image line segments into electronic form, comprising: a linear array of photodetectors for converting light received from the image into electronic signals; an image lens situated between the image and the array for focusing each image line segment onto the array; a light modulator interposed between the image and the image lens for selectively permitting the illumination of the image lens with light received from one of the image line segments; and an object lens positioned between the image and the light modulator for focusing the two-dimensional image onto the light modulator.