Comparison of the shades of gray in the image that define an object and its background. The difference between the closest and farthest distances an object may be shifted before an unacceptable blur is observed. Sometimes called Depth of Focus, DOF should not be confused with working distance. This is also applicable to objects with depth. Also called parallax, this is a phenomenon in conventional lenses which causes a change in magnification as it moves in and out from best focus.
Closer objects appear larger than objects further away.
Telecentric lenses optically correct for this occurrence. The size of a camera sensor's active area, typically specified in the horizontal dimension. Resolution is a measurement of the imaging system's ability to reproduce object detail. Figure 2 illustrates a simplified view of two squares imaged onto pixels of a CCD camera. In order for two objects to be resolvable, a certain amount of space between the objects is needed.