Application of the Sampling Theorem to Solid State Cameras and Flat Panel Displays.

摘要

Evaluators of imaging devices which use two dimensional, staring arrays of detector or display elements, such as Charge Transfer Devices (CTD) or flat panel displays, often assume that scene detail at spatial frequencies up to half the sample rate will necessarily be replicated accurately in the image. That is, they assume that providing two samples per displayed or resolved cycle meets all the criteria of the Sampling Theorem. This assumption is not correct. Solid state cameras and flat panel displays tend to have significant amplitude response to spatial frequencies near 'Nyquist.' In these devices, pixel element size is necessarily smaller than element spacing, so that 'detector cutoff frequency' is at or above the sample rate. Unless mitigated by other factors such as blur in the sensor optics, these imaging devices will have a high value of Modulation Transfer Function (MTF) at half the sample rate.