Access to eBooks is limited to institutions that have purchased or currently subscribe to the SPIE eBooks program. eBooks are not available via an individual subscription. SPIE books (print and digital) may be purchased individually on SPIE.Org.

Contact your librarian to recommend SPIE eBooks for your organization.
Abstract
Interlace and dither reduce sensor sampling intervals without increasing detector count. A high-resolution frame image is comprised of two or more lower resolution fields or sub-images taken sequentially in time. Between each field or sub-image, a nodding mirror or other mechanical means is used to move the locations where the scene is sampled. Interlace and dither achieve high resolution while minimizing focal plane array complexity. The mechanical operation of a dither or microscan mirror is illustrated in Figure 5.1. A mirror is inserted between the objective lens and the FPA. The angular motion of the mirror about the scan axis is very small. Image translation on the FPA is sub-pixel (that is, less than a sample spacing). The figure indicates a horizontal translation of the image, but the mirror can be made to scan about any axis. The sub-pixel image translation provided by the scan mirror allows changing the sample phase of the FPA relative to the scene.
Online access to SPIE eBooks is limited to subscribing institutions.
CHAPTER 5
14 PAGES


SHARE
Back to Top