1. In combination, a calibration card for use in conjunction with a line scan camera for determining the true bottom edge portion of an image field of view of an object being scanned by said line scan camera, comprising: a line scan camera; a charge-coupled device (CCD), defining a field of view comprising a predetermined number of pixels, incorporated within said line scan camera and upon which a captured image of an object can be superimposed; a calibration card having a substantially rectangular configuration and comprising a horizontally oriented bottom edge portion and a vertically oriented leading edge portion; at least one horizontally oriented dark line disposed upon said calibration card at a predetermined vertical distance above said bottom edge portion of said calibration card; and software means, incorporated within said line scan camera and pre-programmed with said vertical distance that said at least one horizontally oriented dark line of said calibration card is spaced from said horizontally oriented bottom edge portion of said calibration card as a predetermined number of pixels, for determining the particular pixel number location of said at least one horizontally oriented dark line, with respect to said predetermined number of pixels comprising said image field of view, so as to determine the particular pixel number location of said bottom edge portion of said calibration card, which simulates the true bottom edge portion of an object being scanned by said line scan camera, by correlating said pre-programmed predetermined number of pixels, defining said vertical distance between said at least one horizontally oriented dark line of said calibration card and said bottom edge portion of said calibration card, with said particular pixel number location of said at least one horizontally oriented dark line as previously determined from said predetermined number of pixels comprising said image field of view, whereby the true bottom edge portion of an image field of view of an object being scanned by said line scan camera is determined.