CCD imagers introduce artifacts into the images they reproduce with a variety of mechanisms related to sampling by a regular array of finite- size pixels. Two classes of artifacts are aliasing and modulation transfer function (MTF) limitations. This work analyzes the origin of both effects and concludes that aliasing is solely an artifact of the sampling process and that MTF limitations are due to the properties of the pixels. The dithering technique is intended to decrease these limitations by repeatedly sampling the same scene. We show in this paper that dithering is effective in removing aliasing artifacts but cannot avoid MTF limitations inherent in the image. In situations where dithering is effective, we analyze some errors likely to be encountered in implementing the technique.

Date Published: 14 March 1995
PDF: 8 pages
Proc. SPIE 2416, Cameras and Systems for Electronic Photography and Scientific Imaging, (14 March 1995); doi: 10.1117/12.204830

Published in SPIE Proceedings Vol. 2416:
Cameras and Systems for Electronic Photography and Scientific Imaging
Constantine N. Anagnostopoulos; Michael P. Lesser, Editor(s)