1. A method for testing an optical characteristic of a camera component, comprising: a) capturing a digital image of a plurality of objects that appear in an imaging target, while an optical image of the objects is formed through the camera component; b) low pass filtering a group of pixels of the digital image that represent portions of the objects; c) analyzing the filtered group of pixels to compute a pixel distance between a first subgroup of pixels that represents a portion of one of the objects, and a second subgroup of pixels that represents a portion of another of the objects; and d) converting the pixel distance into a true distance using a predetermined math relationship that relates a pixel distance variable with a true distance variable.