A direct comparison of the fully continuous Bayes method, working directly on the photon arrival times, with a previously published maximum likelihood method, working on the accumulation histogram, will be the subject of a future paper.
It should be also pointed out that as these methods work directly with the covariance matrix less storage space is needed because they do not need to store huge amounts of time data.
Another class of decoding methods work directly from individual neuron spikes instead of instantaneous firing rate estimates.
Policy gradient methods work directly with action representations, and thus need much less parameters than on-line RL methods.
Supermatrix methods work directly on the raw data that are used for phylogenetic analysis - for example, multiple sequence alignments of DNA sequence (as shown in Figure 1).
Future work will investigate how to extend the FAPH method to work directly in enclosed, fully assembled microchannels without the need for precoating of substrates or the need for device disassembly.
In a separate study, Villiger et al. [ 32] presented a robust Stokes-analysis method that worked directly on endoscopic PS-OCT sample data, and mitigated PMD effects at the expense of a lower axial resolution using a spectral binning method.
On the other hand, it is obvious that JLZA-DOA [8] and the other sparse reconstruction based methods that work directly on the input data can also be extended to 2D situation using the aforementioned decoupled signal model similarly.
First of all, since the methods that work directly on the quadratic eigenvalue problems, for example, [28, 41, 42], are not yet as mature as those for linear eigenvalue problems, the problem is linearized by introducing a new variable λx and turning (10) from a quadratic into a linear eigenvalue problem.
What is more, the other SSR based DOA estimation methods that work directly on the input data, including the weighted version of l 1-SVD [11] or JLZA-DOA [8], can also be extended to 2D situations similar with a much lower complexity than direct extensions.
