Gallas Brandon D, Barrett Harrison H
Center for Devices and Radiological Health, U.S. Food and Drug Administration, HFZ-142, 12720 Twinbrook Parkway, Rockville, Maryland 20857, USA.
J Opt Soc Am A Opt Image Sci Vis. 2003 Sep;20(9):1725-38. doi: 10.1364/josaa.20.001725.
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 ideal 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 linear observer, which can still be unmanageable. Our alternative is the ideal linear observer constrained to a small set of channels: the channelized-Hotelling observer.
图像质量可以根据观察者在给定图像的情况下执行实际感兴趣任务的能力来客观定义。我们回顾了一种用于信号检测任务的实际模型观察者。该任务的理想观察者是图像概率分布的函数，而图像概率分布是多维且复杂的。这种观察者通常很难推导或估计。理想观察者的一种替代方案是理想线性观察者，它可能仍然难以处理。我们的替代方案是约束在一小组通道上的理想线性观察者：通道化霍特林观察者。
