Numerical Stability issues on Channelized Hotelling Observer under different background assumptions

Abstract : 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.
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Submitted on : Wednesday, April 30, 2014 - 5:54:49 PM
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Di Ge, Lu Zhang, Christine Cavaro-Ménard, Patrick Le Callet. Numerical Stability issues on Channelized Hotelling Observer under different background assumptions. Journal of the Optical Society of America. A Optics, Image Science, and Vision, Optical Society of America, 2014, 31 (5), pp.1112-1117. ⟨inserm-00986008⟩

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