Perceptually motivated loss functions for computer generated holographic displays.

Understanding and improving the perceived quality of reconstructed images is key to developing computer-generated holography algorithms for high-fidelity holographic displays. However, current algorithms are typically optimized using mean squared error, which is widely criticized for its poor correlation with perceptual quality. In our work, we present a comprehensive analysis of employing contemporary image quality metrics (IQM) as loss functions in the hologram optimization process.

Adaptive, spatially-varying aberration correction for real-time holographic projectors.

A method of generating an aberration- and distortion-free wide-angle holographically projected image in real time is presented. The target projector is first calibrated using an automated adaptive-optical mechanism. The calibration parameters are then fed into the hologram generation program, which applies a novel piece-wise aberration correction algorithm.

Enhancing the quality of reconstructed 3D objects by using point clusters.

A novel algorithm for constructing computer-generated holograms using point clusters is presented. This method exploits the precalculated triangular meshes used in previous research and can reconstruct less noisy 3D objects. In addition, the high-speed property of a ferroelectric liquid crystal spatial light modulator is utilized to enhance the reconstruction quality.

Fast precalculated triangular mesh algorithm for 3D binary computer-generated holograms.

A new method for constructing computer-generated holograms using a precalculated triangular mesh is presented. The speed of calculation can be increased dramatically by exploiting both the precalculated base triangle and GPU parallel computing. Unlike algorithms using point-based sources, this method can reconstruct a more vivid 3D object instead of a "hollow image.

[The mode of anaesthesia for caesarean section in the opinion of pregnant and delivering women].

Objectives: Conduction anaesthesia is regarded as a very safe method for the mother and for a newborn. This kind of anaesthesia reduces the risk of gastric contents aspiration and does not cause the respiratory depression. However in every case it is essential to take into consideration the woman's opinion, for whom delivering of the child is the particularly important event.