The operation of novelty filtering is demonstrated using a hybrid optical and digital system.
Dynamic gratings are written in photorefractive Bi 12 SiO 20 at 514 nm and read out at 633 …

We demonstrate a technique for the differentiation of time varying optical images that
exploits the spatial frequency dependent response time of grating formation in …

A technique for active spatial filtering is described which used the degenerate four wave
mixing (DFWM) configuration in BSO (Bi 12 SiO 20) plus an additional image modification …

We demonstrate a new optical technique for velocity filtering and feature extraction of time
varying optical images. The technique exploits the recording of complementary (multiplexed) …

We present the design, implementation and detailed investigations on the characteristics of
an optical novelty filter based on two-wave mixing in photorefractive BaTiO 3. The system is …

A new architecture for photorefractive adaptive filtering is introduced. This architecture is
based on the principle of time-integrating correlator with a photorefractive material as the …

A compact photorefractive optical novelty filter is presented. Its two main components, the
nonlinear photorefractive crystal and the spatial light modulator, are characterized. It is …

A method for extending the velocity range of motion detection by an optical tracking novelty
filter is described. Separate photorefractive crystals are used as phase-conjugate mirrors in …

The first known experimental results of real-time optical defect enhancement of a periodic
mask are reported. A low-intensity reference wave interferes with the Fourier transform of an …

The optimisation of a photorefractive novelty filter configuration based on two-beam coupling
and energy depletion of the object bearing beam is conducted. The BaTiO3 sample is …