Restoration of Minute Light Emissions Observed by Streak Camera Based on N-CUP Method

To observe high-speed phenomena such as discharge plasma, it is necessary to restore minute light emissions from an image observed by a streak camera, which includes multiple light emissions at each time. There has been proposed CUP method for restoring minute light emissions via a compressed sensing scheme; however, there is a case in which artefacts occur in the restoration results depending on initial values of the optimization for restoration. To overcome this limitation, N-CUP method that enables successful restoration of minute light emissions is proposed in this paper. N-CUP method estimates initial values suitable for the optimization by iteratively performing CUP method. Through simulation using image datasets emulating phenomena of fundamental light emissions, it was confirmed that N-CUP method obtained successful restoration results.