Biomedical subjects

Yeng Chai Soh

Publications and source records attributed to Yeng Chai Soh.

2 recordsLinked to original sources

PubMed2006

Design of linear-phase two-port optical interleavers using lattice architectures.

A novel lattice structure for the design of two-port optical interleavers is presented. With the proposed lattice structure, the exact linear-phase characteristics of the two outputs of interleavers are guaranteed. The desired spectral characteristics are achieved with appropriate choices of design parameters through an optimization algorithm. It is shown that the linear-phase characteristics of the proposed interleaver are retained even in the presence of design parameter variations. The simulation results verified the effectiveness of the proposed structure and design scheme.

Journal Article↗

PubMed2005

Adaptive autofocusing: a closed-loop perspective.

We present an adaptive autofocusing scheme. In this scheme, the focus measure is updated with focus tuning. To achieve this, we construct the focus measure by using image moments and develop an adaptive focus-tuning strategy to estimate the measure in closed loop. It is shown that the adaptive updating of the focus measure enables us to overcome the dependence of autofocusing on the image contents. Such an adaptive closed-loop focusing operation also effectively suppresses both the effect of the noise in optical imaging and the effect of time delay due to image processing time. Therefore a high accuracy of autofocusing is guaranteed. The effectiveness of the proposed scheme is demonstrated by simulations and experiments.

Algorithms↗