Moire´ Patterns and Two-Dimensional Aliasing in Line Scanner Data Acquisition Systems

The basic mechanism underlying the generation of Moire´ patterns in line scanner data acquisition systems is examined. A general expression is developed in terms of typical system parameters for the reproduced image of such systems and the interaction of the image spectrum; the raster frequency and digital sampling frequency of the A/D conversion process are discussed and examples given. System design requirements for avoiding Moire´ pattern generation and two-dimensional aliasing are discussed.