Image quality can be objectively defined according to how well an observer can perform a task of practical interest given the image. We review a practical model observer for the signal-detection task. The <i>ideal</i> observer for this task is a function of the image probability distributions, which are multidimensional and complicated. This observer is often too difficult to derive or estimate. An alternative to the ideal observer is the ideal <i>linear</i> observer, which can still be unmanageable. Our alternative is the ideal linear observer constrained to a small set of channels: the channelized-Hotelling observer.
© 2003 Optical Society of America
Brandon D. Gallas and Harrison H. Barrett, "Validating the use of channels to estimate the ideal linear observer," J. Opt. Soc. Am. A 20, 1725-1738 (2003)