Ge Di, Zhang Lu, Cavaro-Ménard Christine, Le Callet Patrick
J Opt Soc Am A Opt Image Sci Vis. 2014 May 1;31(5):1112-7. doi: 10.1364/JOSAA.31.001112.
This paper addresses the numerical stability issue on the channelized Hotelling observer (CHO). The CHO is a well-known approach in the medical image quality assessment domain. Many researchers have found that the detection performance of the CHO does not increase with the number of channels, contrary to expectation. And to our knowledge, nobody in this domain has found the reason. We illustrated that this is due to the ill-posed problem of the scatter matrix and proposed a solution based on Tikhonov regularization. Although Tikhonov regularization has been used in many other domains, we show in this paper another important application of Tikhonov regularization. This is very important for researchers to continue the CHO (and other channelized model observer) investigation with a reliable detection performance calculation.
本文探讨了通道化霍特林观察者（CHO）的数值稳定性问题。CHO是医学图像质量评估领域中一种广为人知的方法。许多研究人员发现，与预期相反，CHO的检测性能并不会随着通道数量的增加而提高。据我们所知，该领域中没有人找到原因。我们说明了这是由于散射矩阵的不适定问题，并提出了一种基于蒂霍诺夫正则化的解决方案。尽管蒂霍诺夫正则化已在许多其他领域中使用，但我们在本文中展示了蒂霍诺夫正则化的另一个重要应用。这对于研究人员以可靠的检测性能计算继续进行CHO（以及其他通道化模型观察者）的研究非常重要。
