Chulung Chen

Linearly constraint color pattern recognition with a non-zero order joint transform correlator

In this paper, we purpose a multi-channel single-output non-zero order JTC (NOJTC) to achieve linearly constraint optimization on output correlation energy. The system can be carried out by the power-spectrum subtraction strategy and the design of an ideal reference function with the technique of Lagrange multipliers. Once the zero-order part is removed, the desired correlation peaks are found to be quite distinctive and sharp. The correlator also shows the advantage of distortion invariance and good detection ability.

Non-zero order joint transform correlator with multi-level quantized reference function

A novel method for optical pattern recognition based on the multi-level quantized reference function (MQRF) is presented. The reference function with finite levels is a spatial domain filter, which can be used in the input of a non-zero order joint transform correlator (NOJTC). It is suitable to the current spatial light modulator (SLM). The system has distortion tolerant capability. The desired correlation outputs indicate the success of the technique. In this paper, we have shown that the measurement criteria including peak to correlation energy (PCE), peak to sidelobe ratio (PSR), and discrimination ratio (DR) meliorate as the quantization level increases.

Possible 3D out-of-plane target recognition with an optimized template function

We present a possible way to detect 3D out-of-plane targets. Several Su-27 airplane images with different 3D rotational views were used to synthesize a template function, which successfully detects the target against the non-target such as the F16 airplane. A theoretical development for the purpose of pattern recognition is proposed. The system has the desirable property of sharp peaks with low sidelobes in the output correlation plane when multiple targets appear in the input. The test results show that the correlation peak is quite distinguishable at the location of the target and indicate the success of the technique. When combining the advantages of optics and electronics, the system is suitable for hybrid optical/electrical signal processing.