1. A system for evaluating an optical coding pattern, the system comprising: an image acquiring unit arranged to acquire at least one frame of image data corresponding to a captured portion of an optical coding pattern that includes an array of optical features that each have one or another of a variety of appearances, wherein the frame of image data includes a representation of the optical features; a processor that stores preset feature values corresponding respectively to the variety of appearances that the optical features can have, and that is operable to correlate the array of optical features with corresponding ones of the feature values, and to determine at least one spatial characteristic associated with the captured portion of the optical coding pattern based on at least one of the feature values and the representation of the array of optical features; an object holder, wherein the optical coding pattern is disposed in association with a lower surface of the object holder; and a measuring unit arranged to acquire at least one measurement frame of a captured portion of an object disposed on an upper surface of the object holder, wherein the processor is further operable to generate composite measurement data based on the at least one measurement frame acquired by the measurement unit and the at least one frame of image data acquired by the image acquiring unit.