Automatic target recognition (ATR) technique has been applied in both civil and military. In this paper, we present a new optical pattern recognition system for target recognition. This system includes synthetic discriminate function (SDF) based practical optimized filters for the 3-D targets, the Reference Filter Libs for high correlation SNR, the mapping between the input (object regions) and the output (correlation peaks), and neural networks (ANN) for final decision making. The Real-time optical target recognition is realized by temporal multiplexing technique with electronic addressing spatial light modulator. The experiment results show that the proposed OPR system is efficient and reliable.
A simple phase-shift interference methods using a couple of double slits and a cylindrical lens are proposed to measure the phase modulation characteristics of liquid crystal spatial light modulator (LC-SLM). The experimental results employed the proposed in this paper are presented.
When a fiber with four layers is illuminated by a laser beam collimated perpendicular to its axis, an asymmetry in the frontscattered light pattern will be observed. In our opinions, the eccentricity of fiber core results in it. We deduced the formula and achieved the intensity display from the different path between refracted rays by whole four layers and reflected rays by the fiber core using geometric ray tracing, and calculated the interference geometrically between the refracted rays that traverse whole four layers and one that go through only the outside three layers. The latter is responsible for the modulation of the intensity display. We found that the theoretical values nearly agreed with the experiment and the 5% eccentricity of the fiber core can be inspected. At the same time, this method can be used to in- line inspection of the eccentricity for the fiber manufacturing.