1. A method for measuring the spatial frequency response (SFR) of an imaging system including a display device and an image capture device, said method comprising the steps of: displaying a sequence of displayable test pattern images on the display device, the sequence comprising at least three different test pattern images, each of the displayable test pattern images including a test pattern having at least one sinusoidal pattern at one or more spatial frequencies such that for at least one spatial frequency, the corresponding sinusoidal patterns of each of the at least three test pattern images in the sequence are, at a point common to the at least three test pattern images, shifted in phase by predetermined values relative to each other; capturing the displayed sequence of images with the image capture device to generate a corresponding sequence of captured test pattern images; and comparing the captured test pattern images with the displayable test pattern images to calculate the SFR at a plurality of image locations in the imaging system at the one or more spatial frequencies.